Open interactive dialogs

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Dialogs are windowed, card-based interfaces that Chat apps open to interact with users. To help users complete multi-step processes, apps can open sequential dialogs.

Dialogs are useful for many types of user interactions, including:

  • Collecting information from users
  • Authenticating users with Web services
  • Configuring Chat app settings

This guide describes how to implement dialogs for your Chat app.

Prerequisites

To implement dialogs and run the examples in this guide, you need:

Node.js

Apps Script

Python

How dialogs work

When a user clicks a button on a card or issues a slash command, the Chat app can open a dialog to interact with the user.

Clicking a button on a card to open a dialog.
Figure 1: Clicking a button on a card to open a dialog.
Clicking a button on a card to open a dialog.
Figure 2: Issuing a slash command to open a dialog.

The dialog facilitates user interaction by letting users enter information with widgets, like text-input fields. When collecting a lot of information from users, Chat apps can open sequential dialogs.

A dialog featuring a variety of different widgets.
Figure 3: An open dialog prompting a user to add a contact.
A dialog featuring a variety of different widgets.
Figure 4: A second dialog prompts the user for more information.

When finished, the Chat app receives the values users entered in the dialog as JSON. Inform users that their interaction succeeded by responding with a text message or a card.

Open a dialog

Your Chat app can open a dialog in response to a user:

When a user requests a dialog, your Chat app receives a Google Chat Event in which:

  • isDialogEvent is true.
  • DialogEventType specifies whether a user is opening a dialog (REQUEST_DIALOG), clicking a button in a dialog (SUBMIT_DIALOG), or canceling a dialog (CANCEL_DIALOG).

For example, when a user opens a dialog, your Chat app receives an Event like this from Google Chat:

JSON

{
  "type": enum (EventType),
  "eventTime": string,
  "threadKey": string,
  "message": {
    object (Message)
  },
  "user": {
    object (User)
  },
  "space": {
    object (Space)
  },
  "action": {
    object (FormAction)
  },
  "configCompleteRedirectUrl": string,
  "isDialogEvent": true,
  "dialogEventType": "REQUEST_DIALOG",
  "common": {
    object (CommonEventObject)
  }
}

Your Chat app can open a dialog by returning an ActionResponse of "type": "DIALOG" with a DialogAction that includes a JSON description of the dialog:

JSON

{
  "action_response": {
    "type": "DIALOG",
    "dialog_action": {
      "dialog": {
        "body": {
          "sections": [
            {
              "header": "Add new contact",
              "widgets": [
                {
                  "textInput": {
                    "label": "Name",
                    "type": "SINGLE_LINE",
                    "name": "contactName"
                  }
                },
                {
                  "textInput": {
                    "label": "Address",
                    "type": "MULTIPLE_LINE",
                    "name": "address"
                  }
                },
                {
                  "decoratedText": {
                    "text": "Add to favorites",
                    "switchControl": {
                      "controlType": "SWITCH",
                      "name": "saveFavorite"
                    }
                  }
                },
                {
                  "decoratedText": {
                    "text": "Merge with existing contacts",
                    "switchControl": {
                      "controlType": "SWITCH",
                      "name": "mergeContact",
                      "selected": true
                    }
                  }
                },
                {
                  "buttonList": {
                    "buttons": [
                      {
                        "text": "Next",
                        "onClick": {
                          "action": {
                            "function": "openSequentialDialog"
                          }
                        }
                      }
                    ]
                  }
                }
              ]
            }
          ]
        }
      }
    }
  }
}

Open a dialog in response to a button click on a card

When a user clicks a button on a card, your app receives an Event where:

To open a dialog, specify:

In this example, a Chat app responds to a MESSAGE Event with a card that has a button that opens a dialog:

Node.js

/**
* Responds to messages that have links whose URLs
* match URL patterns configured for link previews.
*
* @param {Object} event The event object from Chat
* API.
*
* @return {Object} Response from the Chat app
* attached to the message with the previewed link.
*/
exports.onMessage = function onMessage(req, res) {

  // Store the Google Chat event as a variable.
  var event = req.body;

  if (req.method === "GET" || !event.message) {
    res.send("Hello! This function is meant to be used in a Google Chat " +
      "Space.");
  }

  // Responds with a card that prompts the user to add a contact
  else {
    res.json({
      "cards_v2": [{
        "card_id": "addContact",
        "card": {
          "header": {
            "title": "Rolodex",
            "subtitle": "Manage your contacts!",
            "imageUrl": "https://www.gstatic.com/images/branding/product/2x/contacts_48dp.png",
            "imageType": "CIRCLE"
          },
          "sections": [
            {
              "widgets": [
                {
                  "buttonList": {
                    "buttons": [
                      {
                        "text": "Add Contact",
                        "onClick": {
                          "action": {
                            "function": "openDialog",
                            "interaction": "OPEN_DIALOG"
                          }
                        }
                      }
                    ]
                  }
                }
              ]
            }
          ]
        }
      }]

    });
  }

  // Respond to button clicks on attached cards
  if(event.type === "CARD_CLICKED") {

    if (event.common.invokedFunction == "openDialog") {
      res.openDialog(event);
};

/**
 * Opens and starts a dialog that allows users to add details about a contact.
 *
 * @param {object} event the event object from Google Chat.
 *
 * @return {object} open a dialog.
 */
function openDialog(event) {
  res.json({
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Name",
                        "type": "SINGLE_LINE",
                        "name": "name"
                      }
                    },
                    {
                      "textInput": {
                        "label": "Address",
                        "type": "MULTIPLE_LINE",
                        "name": "address"
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Add to favorites",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "saveFavorite"
                        }
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Merge with existing contacts",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "mergeContact",
                          "selected": true
                        }
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Next",
                            "onClick": {
                              "action": {
                                "function": "openSequentialDialog"
                              }
                            }
                          }
                        ]
                      }
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  });
};

Apps Script

/**
 * Responds to a MESSAGE event in Google Chat with a card with a button
 * that opens a dialog.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in response to a card's button click.
 */
function onMessage(event) {
  return {
    "cards_v2": [{
      "card_id": "addContact",
      "card": {
        "header": {
          "title": "Rolodex",
          "subtitle": "Manage your contacts!",
          "imageUrl": "https://www.gstatic.com/images/branding/product/2x/contacts_48dp.png",
          "imageType": "CIRCLE"
        },
        "sections": [
          {
            "widgets": [
              {
                "buttonList": {
                  "buttons": [
                    {
                      "text": "Add Contact",
                      "onClick": {
                        "action": {
                          "function": "openDialog",
                          "interaction": "OPEN_DIALOG"
                        }
                      }
                    }
                  ]
                },
                "horizontalAlignment": "CENTER"
              }
            ]
          }
        ]
      }
    }]
  };
}

/**
 * Responds to a CARD_CLICKED event in Google Chat.
 *
 * @param {Object} event the event object from Google Chat
 */
function onCardClick(event) {
  if (event.common.invokedFunction == "openDialog") {
    return openDialog(event);
  }
}

/**
 * Opens a dialog in Google Chat.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in Google Chat.
 */
function openDialog(event) {
  return {
    "action_response": {
      "type": "DIALOG",
      "dialog_action": {
        "dialog": {
          "body": {
            "sections": [
              {
                "header": "Add new contact",
                "widgets": [
                  {
                    "textInput": {
                      "label": "Name",
                      "type": "SINGLE_LINE",
                      "name": "contactName"
                    }
                  },
                  {
                    "textInput": {
                      "label": "Address",
                      "type": "MULTIPLE_LINE",
                      "name": "address"
                    }
                  },
                  {
                    "decoratedText": {
                      "text": "Add to favorites",
                      "switchControl": {
                        "controlType": "SWITCH",
                        "name": "saveFavorite"
                      }
                    }
                  },
                  {
                    "decoratedText": {
                      "text": "Merge with existing contacts",
                      "switchControl": {
                        "controlType": "SWITCH",
                        "name": "mergeContact",
                        "selected": true
                      }
                    }
                  },
                  {
                    "buttonList": {
                      "buttons": [
                        {
                          "text": "Next",
                          "onClick": {
                            "action": {
                              "function": "openSequentialDialog"
                            }
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            ]
          }
        }
      }
    }
  };
}

Python

from typing import Any, Mapping

import flask
import functions_framework

@functions_framework.http
def main(req: flask.Request) -> Mapping[str, Any]:
  """Responds to a MESSAGE event in Google Chat that includes the /createContact
     slash command by opening a dialog.

  Args:
      req (flask.Request): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """

  if req.method == 'GET':
    return 'Sorry, this function must be called from a Google Chat.'

  request = req.get_json(silent=True)

  if request.get('type') == 'CARD_CLICKED':
    if request.get('common', dict()).get('invokedFunction') == 'open_dialog':
      return open_dialog(request)

  else:
    return {
      'cards_v2': [{
        'card_id': 'addContact',
        'card': {
          'header': {
            'title': 'Rolodex',
            'subtitle': 'Manage your contacts!',
            'imageUrl': 'https://www.gstatic.com/images/branding/product/2x/contacts_48dp.png',
            'imageType': 'CIRCLE'
          },
          'sections': [
            {
              'widgets': [
                {
                  'buttonList': {
                    'buttons': [
                      {
                        'text': 'Add Contact',
                        'onClick': {
                          'action': {
                            'function': 'open_dialog',
                            'interaction': 'OPEN_DIALOG'
                          }
                        }
                      }
                    ]
                  }
                }
              ]
            }
          ]
        }
      }]
    }

def open_dialog(request: Mapping[str, Any]) -> Mapping[str, Any]:
  """Opens a dialog in Google Chat.

  Args:
      request (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """
  return {
    'action_response': {
      'type': 'DIALOG',
      'dialog_action': {
        'dialog': {
          'body': {
            'sections': [
              {
                'header': 'Add new contact',
                'widgets': [
                  {
                    'textInput': {
                      'label': 'Name',
                      'type': 'SINGLE_LINE',
                      'name': 'name'
                    }
                  },
                  {
                    'textInput': {
                      'label': 'Address',
                      'type': 'MULTIPLE_LINE',
                      'name': 'address'
                    }
                  },
                  {
                    'decoratedText': {
                      'text': 'Add to favorites',
                      'switchControl': {
                        'controlType': 'SWITCH',
                        'name': 'saveFavorite'
                      }
                    }
                  },
                  {
                    'decoratedText': {
                      'text': 'Merge with existing contacts',
                      'switchControl': {
                        'controlType': 'SWITCH',
                        'name': 'mergeContact',
                        'selected': True
                      }
                    }
                  },
                  {
                    'buttonList': {
                      'buttons': [
                        {
                          'text': 'Next',
                          'onClick': {
                            'action': {
                              'function': 'open_sequential_dialog'
                            }
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            ]
          }
        }
      }
    }
  }

Open a dialog in response to a slash command

When a user opens a dialog with a slash command, your app receives an Event where:

To open a dialog, respond with:

In this example, a Chat app responds to the /createContact slash command by opening a dialog:

Node.js

/**
* Responds to messages that have links whose URLs
* match URL patterns configured for link previews.
*
* @param {Object} event The event object from Chat
* API.
*
* @return {Object} Response from the Chat app
* attached to the message with the previewed link.
*/
exports.onMessage = function onMessage(req, res) {

  // Store the Google Chat event as a variable.
  var event = req.body;

  if (req.method === "GET" || !event.message) {
    res.send("Hello! This function is meant to be used in a Google Chat " +
      "Space.");
  }

  // Checks for the presence of event.message.slashCommand.
  // If the slash command is "/help", responds with a text message.
  // If the slash command is "/createContact", opens a dialog.
  if (event.message.slashCommand) {
    switch (event.message.slashCommand.commandId) {
      case 1: // /help
        res.json({"text": "Contact bot helps you update your address book!"});
      case 2:  // /createContact
        res.openDialog(event);
    }
  }
};

/**
 * Opens and starts a dialog that allows users to add details about a contact.
 *
 * @param {object} event the event object from Google Chat.
 *
 * @return {object} open a dialog.
 */
function openDialog(event) {
  res.json({
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Name",
                        "type": "SINGLE_LINE",
                        "name": "name"
                      }
                    },
                    {
                      "textInput": {
                        "label": "Address",
                        "type": "MULTIPLE_LINE",
                        "name": "address"
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Add to favorites",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "saveFavorite"
                        }
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Merge with existing contacts",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "mergeContact",
                          "selected": true
                        }
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Next",
                            "onClick": {
                              "action": {
                                "function": "openSequentialDialog"
                              }
                            }
                          }
                        ]
                      }
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  });
};

Apps Script

/**
 * Responds to a MESSAGE event in Google Chat that includes the /createContact
 * slash command by opening a dialog.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in response to a slash command.
 */
function onMessage(event) {

  // Checks for the presence of event.message.slashCommand.
  // If the slash command is "/help", responds with a text message.
  // If the slash command is "/createContact", opens a dialog.
  if (event.message.slashCommand) {
    switch (event.message.slashCommand.commandId) {
      case 1: // /help
        return {"text": "Contact bot helps you update your address book!"}
      case 2:  // /createContact
        return openDialog(event);
    }
  }
}

/**
 * Opens a dialog in Google Chat.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in Google Chat.
 */
function openDialog(event) {
  return {
    "action_response": {
      "type": "DIALOG",
      "dialog_action": {
        "dialog": {
          "body": {
            "sections": [
              {
                "header": "Add new contact",
                "widgets": [
                  {
                    "textInput": {
                      "label": "Name",
                      "type": "SINGLE_LINE",
                      "name": "contactName"
                    }
                  },
                  {
                    "textInput": {
                      "label": "Address",
                      "type": "MULTIPLE_LINE",
                      "name": "address"
                    }
                  },
                  {
                    "decoratedText": {
                      "text": "Add to favorites",
                      "switchControl": {
                        "controlType": "SWITCH",
                        "name": "saveFavorite"
                      }
                    }
                  },
                  {
                    "decoratedText": {
                      "text": "Merge with existing contacts",
                      "switchControl": {
                        "controlType": "SWITCH",
                        "name": "mergeContact",
                        "selected": true
                      }
                    }
                  },
                  {
                    "buttonList": {
                      "buttons": [
                        {
                          "text": "Next",
                          "onClick": {
                            "action": {
                              "function": "openSequentialDialog"
                            }
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            ]
          }
        }
      }
    }
  };
}

Python

from typing import Any, Mapping

import flask
import functions_framework

@functions_framework.http
def main(req: flask.Request) -> Mapping[str, Any]:
  """Responds to a MESSAGE event in Google Chat that includes the /createContact
     slash command by opening a dialog.

  Args:
      req (flask.Request): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a slash command.
  """
  if req.method == 'GET':
    return 'Sorry, this function must be called from a Google Chat.'

  request = req.get_json(silent=True)

  if slash_command := request.get('message', dict()).get('slashCommand'):
    command_id = slash_command['commandId']
    if command_id == 1:
      return {'text': 'Contact bot helps you update your address book!'}

    elif command_id == 2:
      return open_dialog(request)

def open_dialog(request: Mapping[str, Any]) -> Mapping[str, Any]:
  """Opens a dialog in Google Chat.

  Args:
      request (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a slash command.
  """
  return {
    'action_response': {
      'type': 'DIALOG',
      'dialog_action': {
        'dialog': {
          'body': {
            'sections': [
              {
                'header': 'Add new contact',
                'widgets': [
                  {
                    'textInput': {
                      'label': 'Name',
                      'type': 'SINGLE_LINE',
                      'name': 'name'
                    }
                  },
                  {
                    'textInput': {
                      'label': 'Address',
                      'type': 'MULTIPLE_LINE',
                      'name': 'address'
                    }
                  },
                  {
                    'decoratedText': {
                      'text': 'Add to favorites',
                      'switchControl': {
                        'controlType': 'SWITCH',
                        'name': 'saveFavorite'
                      }
                    }
                  },
                  {
                    'decoratedText': {
                      'text': 'Merge with existing contacts',
                      'switchControl': {
                        'controlType': 'SWITCH',
                        'name': 'mergeContact',
                        'selected': True
                      }
                    }
                  },
                  {
                    'buttonList': {
                      'buttons': [
                        {
                          'text': 'Next',
                          'onClick': {
                            'action': {
                              'function': 'open_sequential_dialog'
                            }
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            ]
          }
        }
      }
    }
  }

String together multiple card interfaces

When user interactions require more than one card, you can open a new card from the same dialog by returning another dialog.

When users click a button in a dialog, your app receives an Event where:

Since a dialog is already open, don't specify onClick.action.interaction like you do when opening a dialog from an in-conversation card. Instead, return only onClick.action.function as the name of a function that opens a dialog.

In this example, a Chat app responds to a CARD_CLICKED Event from a dialog button click by opening another dialog:

Node.js

// Respond to button clicks on attached cards
if(event.type === "CARD_CLICKED") {

  // Open the first dialog.
  if (event.common.invokedFunction == "openDialog") {
    res.openDialog(event);
  }

  // Open the second dialog.
  if (event.common.invokedFunction == "openSequentialDialog") {
    res.openSequentialDialog(event);
  }
}

/**
* Opens and starts a dialog that allows users to add details about a contact.
*
* @param {object} event the event object from Google Chat.
*
* @return {object} open a dialog.
*/
function openDialog(event) {
  res.json({
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Name",
                        "type": "SINGLE_LINE",
                        "name": "name"
                      }
                    },
                    {
                      "textInput": {
                        "label": "Address",
                        "type": "MULTIPLE_LINE",
                        "name": "address"
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Add to favorites",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "saveFavorite"
                        }
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Merge with existing contacts",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "mergeContact",
                          "selected": true
                        }
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Next",
                            "onClick": {
                              "action": {
                                "function": "openSequentialDialog"
                              }
                            }
                          }
                        ]
                      }
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  });
};

/**
* Opens a second dialog that allows users to add more contact details.
*
* @param {object} event the event object from Google Chat.
*
* @return {object} open a dialog.
*/
function openSequentialDialog(event) {
res.json({
  "action_response": {
      "type": "DIALOG",
      "dialog_action": {
        "dialog": {
          "body": {
            "sections": [
              {
                "header": "Add new contact",
                "widgets": [
                  {
                    "textInput": {
                      "label": "Notes",
                      "type": "MULTIPLE_LINE",
                      "name": "notes"
                    }
                  },
                  {
                    "selectionInput": {
                      "type": "RADIO_BUTTON",
                      "label": "Contact type",
                      "name": "contactType",
                      "items": [
                        {
                          "text": "Work",
                          "value": "Work",
                          "selected": false
                        },
                        {
                          "text": "Personal",
                          "value": "Personal",
                          "selected": false
                        }
                      ]
                    }
                  },
                  {
                    "buttonList": {
                      "buttons": [
                        {
                          "text": "Submit",
                          "onClick": {
                            "action": {
                              "function": "confirmDialogSuccess",
                              "parameters": [
                                {
                                  "key": "confirmDialogSuccess",
                                  "value": "confirmDialogSuccess"
                                }
                              ]
                            }
                          }
                        }
                      ]
                    },
                    "horizontalAlignment": "END"
                  }
                ]
              }
            ]
          }
        }
      }
  }
});

Apps Script

/**
 * Responds to a CARD_CLICKED event in Google Chat.
 *
 * @param {Object} event the event object from Google Chat
 */
function onCardClick(event) {

  // When a user clicks a card, the app checks to see which function to run.
  if (event.common.invokedFunction == "openDialog") {
    return openDialog(event);
  }

  if (event.common.invokedFunction == "openSequentialDialog") {
    return openSequentialDialog(event);
  }
}

/**
 * Opens and starts a dialog that allows users to add details about a contact.
 *
 * @param {object} event the event object from Google Chat.
 *
 * @return {object} open a dialog.
 */
function openDialog(event) {
  return {
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Name",
                        "type": "SINGLE_LINE",
                        "name": "contactName"
                      }
                    },
                    {
                      "textInput": {
                        "label": "Address",
                        "type": "MULTIPLE_LINE",
                        "name": "address"
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Add to favorites",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "saveFavorite"
                        }
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Merge with existing contacts",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "mergeContact",
                          "selected": true
                        }
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Next",
                            "onClick": {
                              "action": {

                                // Specifies which function to run
                                // in response to the card click.
                                "function": "openSequentialDialog"
                              }
                            }
                          }
                        ]
                      }
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  };
}

/**
 * Opens a second dialog that allows users to add more contact details.
 *
 * @param {object} event the event object from Google Chat.
 *
 * @return {object} open a dialog.
 */
function openSequentialDialog(event) {
  return {
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Notes",
                        "type": "MULTIPLE_LINE",
                        "name": "notes"
                      }
                    },
                    {
                      "selectionInput": {
                        "type": "RADIO_BUTTON",
                        "label": "Contact type",
                        "name": "contactType",
                        "items": [
                          {
                            "text": "Work",
                            "value": "Work",
                            "selected": false
                          },
                          {
                            "text": "Personal",
                            "value": "Personal",
                            "selected": false
                          }
                        ]
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Submit",
                            "onClick": {
                              "action": {

                                // Specifies which function to run
                                // in response to the card click.
                                "function": "receiveDialog",
                                "parameters": [
                                  {
                                    "key": "receiveDialog",
                                    "value": "receiveDialog"
                                  }
                                ]
                              }
                            }
                          }
                        ]
                      },
                      "horizontalAlignment": "END"
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  };
}

Python

from typing import Any, Mapping

import flask
import functions_framework

@functions_framework.http
def main(req: flask.Request) -> Mapping[str, Any]:
  """Responds to a MESSAGE event in Google Chat that includes the /createContact
     slash command by opening a dialog.

  Args:
      req (flask.Request): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """

  if req.method == 'GET':
    return 'Sorry, this function must be called from a Google Chat.'

  request = req.get_json(silent=True)

  if request.get('type') == 'CARD_CLICKED':
    if invoked_function := request.get('common', dict()).get('invokedFunction'):
      if invoked_function == 'open_dialog':
        return open_dialog(request)

      elif invoked_function == 'open_sequential_dialog':
        return open_dialog(request)

def open_dialog(request: Mapping[str, Any]) -> Mapping[str, Any]:
  """Opens a dialog in Google Chat.

  Args:
      request (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """
  return {
    'action_response': {
      'type': 'DIALOG',
      'dialog_action': {
        'dialog': {
          'body': {
            'sections': [
              {
                'header': 'Add new contact',
                'widgets': [
                  {
                    'textInput': {
                      'label': 'Name',
                      'type': 'SINGLE_LINE',
                      'name': 'name'
                    }
                  },
                  {
                    'textInput': {
                      'label': 'Address',
                      'type': 'MULTIPLE_LINE',
                      'name': 'address'
                    }
                  },
                  {
                    'decoratedText': {
                      'text': 'Add to favorites',
                      'switchControl': {
                        'controlType': 'SWITCH',
                        'name': 'saveFavorite'
                      }
                    }
                  },
                  {
                    'decoratedText': {
                      'text': 'Merge with existing contacts',
                      'switchControl': {
                        'controlType': 'SWITCH',
                        'name': 'mergeContact',
                        'selected': True
                      }
                    }
                  },
                  {
                    'buttonList': {
                      'buttons': [
                        {
                          'text': 'Next',
                          'onClick': {
                            'action': {
                              'function': 'open_sequential_dialog'
                            }
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            ]
          }
        }
      }
    }
  }

def open_sequential_dialog(request: Mapping[str, Any]) -> Mapping[str, Any]:
  """Opens a second dialog that allows users to add more contact details.

  Args:
      request (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """
  return {
    'action_response': {
      'type': 'DIALOG',
      'dialog_action': {
        'dialog': {
          'body': {
            'sections': [
              {
                'header': 'Add new contact',
                'widgets': [
                  {
                    'textInput': {
                      'label': 'Notes',
                      'type': 'MULTIPLE_LINE',
                      'name': 'notes'
                    }
                  },
                  {
                    'selectionInput': {
                      'type': 'RADIO_BUTTON',
                      'label': 'Contact type',
                      'name': 'contactType',
                      'items': [
                        {
                          'text': 'Work',
                          'value': 'Work',
                          'selected': False
                        },
                        {
                          'text': 'Personal',
                          'value': 'Personal',
                          'selected': False
                        }
                      ]
                    }
                  },
                  {
                    'buttonList': {
                      'buttons': [
                        {
                          'text': 'Submit',
                          'onClick': {
                            'action': {
                              'function': 'receiveDialog',
                              'parameters': [
                                {
                                  'key': 'receiveDialog',
                                  'value': 'receiveDialog'
                                }
                              ]
                            }
                          }
                        }
                      ]
                    },
                    'horizontalAlignment': 'END'
                  }
                ]
              }
            ]
          }
        }
      }
    }
  }

Receive form data from dialogs

When users click a button on a dialog, the data they entered gets submitted to the Chat app, and the app receives an Event where:

The data users enter in the dialog are available on the Event as Event.common.formInputs, a map where keys are string IDs assigned to each dialog widget and values represent user input for each widget. Different objects represent different input data types. For example, Event.common.formInputs.stringInputs represent string inputs.

When a user submits a dialog, your Chat app receives an Event like this from Google Chat:

JSON

{
  "type": enum (EventType),
  "eventTime": string,
  "threadKey": string,
  "message": {
    object (Message)
  },
  "user": {
    object (User)
  },
  "space": {
    object (Space)
  },
  "action": {
    object (FormAction)
  },
  "configCompleteRedirectUrl": string,

  // Indicates that this event is dialog-related.
  "isDialogEvent": true,

  // Indicates that a user clicked a button, and all data
  // they entered in the dialog is included in Event.common.formInputs.
  "dialogEventType": "SUBMIT_DIALOG",
  "common": {
    "userLocale": string,
    "hostApp": enum (HostApp),
    "platform": enum (Platform),
    "timeZone": {
      object (TimeZone)
    },

    // Represents user data entered in a dialog
    "formInputs": {

      // Represents string data entered in a dialog, like text input fields
      // and check boxes
      "stringInputs": {

        // An array of strings entered by the user in a dialog.
        "value": [
          string
        ]
      }
    },
    "parameters": {
      string: string,
      ...
    },
    "invokedFunction": string
  }
}

Your app can access the first user-entered value at event.common.formInputs.NAME.stringInputs.value[0], where NAME is the name field of a TextInput widget.

After receiving the dialog form data, the Chat app should respond by either acknowledging receipt or by returning an error, both of which are done with by returning an ActionResponse:

  • To acknowledge successful receipt, respond with an ActionResponse that has "actionStatus": "OK".
  • To return an error, respond with an ActionResponse that has "actionStatus": "ERROR MESSAGE".

The following example checks for the presence of a "name" value. If it's absent, the app returns an error. If it's present, the app acknowledges receipt of the form data and closes the dialog.

Node.js

/**
 * Checks for a form input error, the absence of
 * a "name" value, and returns an error if absent.
 * Otherwise, confirms successful receipt of a dialog.
 *
 * Confirms successful receipt of a dialog.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in Google Chat.
 */
function receiveDialog(event) {

  // Checks to make sure the user entered a name
  // in a dialog. If no name value detected, returns
  // an error message.
  if (event.common.formInputs.contactName.stringInputs.value[0] == "") {
    res.json({
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "Don't forget to name your new contact!"
        }
      }
    });

  // Otherwise the app indicates that it received
  // form data from the dialog. Any value other than "OK"
  // gets returned as an error. "OK" is interpreted as
  // code 200, and the dialog closes.
  } else {
    res.json({
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "OK"
        }
      }
    });
  }
}

Apps Script

/**
 * Checks for a form input error, the absence of
 * a "name" value, and returns an error if absent.
 * Otherwise, confirms successful receipt of a dialog.
 *
 * Confirms successful receipt of a dialog.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in Google Chat.
 */
function receiveDialog(event) {

  // Checks to make sure the user entered a name
  // in a dialog. If no name value detected, returns
  // an error message.
  if (event.common.formInputs.contactName.stringInputs.value[0] == "") {
    return {
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "Don't forget to name your new contact!"
        }
      }
    };

  // Otherwise the app indicates that it received
  // form data from the dialog. Any value other than "OK"
  // gets returned as an error. "OK" is interpreted as
  // code 200, and the dialog closes.
  } else {
    return {
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "OK"
        }
      }
    };
  }
}

Python

def receive_dialog(event: Mapping[str, Any]) -> Mapping[str, Any]:
  """Checks for a form input error, the absence of a "name" value, and returns
     an error if absent. Otherwise, confirms successful receipt of a dialog.

  Args:
      event (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: the response.
  """

  if common := event.get('common'):
    if form_inputs := common.get('formInputs'):
      if contact_name := form_inputs.get('contactName'):
        if string_inputs := contact_name.get('stringInputs')
          if name := string_inputs.get('value'):
            return {
              'actionResponse': {
                'type': 'DIALOG',
                'dialogAction': {
                  'actionStatus': 'OK'
                }
              }
            }
          else:
            return {
              'actionResponse': {
                'type': 'DIALOG',
                'dialogAction': {
                  'actionStatus': 'Don't forget to name your new contact!'
                }
              }
            }

Respond to a dialog with a text message or a card

To respond to a dialog with a simple text message or card, authenticate with a service account, then send an asynchronous reply by calling spaces.messages.create using the Google Chat REST API.

Complete example: Rolodex the contact managing Chat app

In this example, a Chat app opens a dialog so the user can add details about a contact, such as name, email, and address.

Node.js

/**
* Responds to messages that have links whose URLs
* match URL patterns configured for link previews.
*
* @param {Object} event The event object from Chat
* API.
*
* @return {Object} Response from the Chat app
* attached to the message with the previewed link.
*/
exports.onMessage = function onMessage(req, res) {

  // Store the Google Chat event as a variable.
  var event = req.body;

  if (req.method === "GET" || !event.message) {
    res.send("Hello! This function is meant to be used in a Google Chat " +
      "Space.");
  }

  // Checks for the presence of event.message.slashCommand.
  // If the slash command is "/help", responds with a text message.
  // If the slash command is "/createContact", opens a dialog.
  if (event.message.slashCommand) {
    switch (event.message.slashCommand.commandId) {
      case 1: // /help
        res.json({"text": "Contact bot helps you update your address book!"});
      case 2:  // /createContact
        res.openDialog(event);
    }
  }

  // If the Chat app doesn"t detect a slash command, it responds
  // with a card that prompts the user to add a contact
  else {
    res.json({
      "cards_v2": [{
        "card_id": "addContact",
        "card": {
          "header": {
            "title": "Rolodex",
            "subtitle": "Manage your contacts!",
            "imageUrl": "https://www.gstatic.com/images/branding/product/2x/contacts_48dp.png",
            "imageType": "CIRCLE"
          },
          "sections": [
            {
              "widgets": [
                {
                  "buttonList": {
                    "buttons": [
                      {
                        "text": "Add Contact",
                        "onClick": {
                          "action": {
                            "function": "openDialog",
                            "interaction": "OPEN_DIALOG"
                          }
                        }
                      }
                    ]
                  }
                }
              ]
            }
          ]
        }
      }]

    });
  }

  // Respond to button clicks on attached cards
  if(event.type === "CARD_CLICKED") {

    if (event.common.invokedFunction == "openDialog") {
      res.openDialog(event);
    }

    if (event.common.invokedFunction == "openSequentialDialog") {
      res.openSequentialDialog(event);
    }

    if (event.common.invokedFunction == "confirmDialogSuccess") {
      res.confirmDialogSuccess(event);
    }

  }

};

/**
 * Opens and starts a dialog that allows users to add details about a contact.
 *
 * @param {object} event the event object from Google Chat.
 *
 * @return {object} open a dialog.
 */
function openDialog(event) {
  res.json({
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Name",
                        "type": "SINGLE_LINE",
                        "name": "name"
                      }
                    },
                    {
                      "textInput": {
                        "label": "Address",
                        "type": "MULTIPLE_LINE",
                        "name": "address"
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Add to favorites",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "saveFavorite"
                        }
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Merge with existing contacts",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "mergeContact",
                          "selected": true
                        }
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Next",
                            "onClick": {
                              "action": {
                                "function": "openSequentialDialog"
                              }
                            }
                          }
                        ]
                      }
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  });
};

/**
 * Opens a second dialog that allows users to add more contact details.
 *
 * @param {object} event the event object from Google Chat.
 *
 * @return {object} open a dialog.
 */
function openSequentialDialog(event) {
  res.json({
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Notes",
                        "type": "MULTIPLE_LINE",
                        "name": "notes"
                      }
                    },
                    {
                      "selectionInput": {
                        "type": "RADIO_BUTTON",
                        "label": "Contact type",
                        "name": "contactType",
                        "items": [
                          {
                            "text": "Work",
                            "value": "Work",
                            "selected": false
                          },
                          {
                            "text": "Personal",
                            "value": "Personal",
                            "selected": false
                          }
                        ]
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Submit",
                            "onClick": {
                              "action": {
                                "function": "confirmDialogSuccess",
                                "parameters": [
                                  {
                                    "key": "confirmDialogSuccess",
                                    "value": "confirmDialogSuccess"
                                  }
                                ]
                              }
                            }
                          }
                        ]
                      },
                      "horizontalAlignment": "END"
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  });
}

/**
 * Checks for a form input error, the absence of
 * a "name" value, and returns an error if absent.
 * Otherwise, confirms successful receipt of a dialog.
 *
 * Confirms successful receipt of a dialog.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in Google Chat.
 */
function receiveDialog(event) {

  // Checks to make sure the user entered a name
  // in a dialog. If no name value detected, returns
  // an error message.
  if (event.common.formInputs.contactName.stringInputs.value[0] == "") {
    res.json({
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "Don't forget to name your new contact!"
        }
      }
    });

  // Otherwise the app indicates that it received
  // form data from the dialog. Any value other than "OK"
  // gets returned as an error. "OK" is interpreted as
  // code 200, and the dialog closes.
  } else {
    res.json({
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "OK"
        }
      }
    });
  }
}

Apps Script

/**
 * Responds to a MESSAGE event in Google Chat.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in response to a slash command
 * or a card"s button click.
 */
function onMessage(event) {

  // Checks for the presence of event.message.slashCommand.
  // If the slash command is "/help", responds with a text message.
  // If the slash command is "/createContact", opens a dialog.
  if (event.message.slashCommand) {
    switch (event.message.slashCommand.commandId) {
      case 1: // /help
        return {"text": "Contact bot helps you update your address book!"}
      case 2:  // /createContact
        return openDialog(event);
    }
  }

  // If the Chat app doesn"t detect a slash command, it responds
  // with a card that prompts the user to add a contact
  else {
    return {
      "cards_v2": [{
        "card_id": "addContact",
        "card": {
          "header": {
            "title": "Rolodex",
            "subtitle": "Manage your contacts!",
            "imageUrl": "https://www.gstatic.com/images/branding/product/2x/contacts_48dp.png",
            "imageType": "CIRCLE"
          },
          "sections": [
            {
              "widgets": [
                {
                  "buttonList": {
                    "buttons": [
                      {
                        "text": "Add Contact",
                        "onClick": {
                          "action": {
                            "function": "openDialog",
                            "interaction": "OPEN_DIALOG"
                          }
                        }
                      }
                    ]
                  }
                }
              ]
            }
          ]
        }
      }]

    };
  }
}

/**
 * Responds to a CARD_CLICKED event in Google Chat.
 *
 * @param {Object} event the event object from Google Chat
 */
function onCardClick(event) {

  if (event.common.invokedFunction == "openDialog") {
    return openDialog(event);
  }

  if (event.common.invokedFunction == "openSequentialDialog") {
    return openSequentialDialog(event);
  }

  if (event.common.invokedFunction == "receiveDialog") {
    return receiveDialog(event);
  }
}

/**
 * Opens and starts a dialog that allows users to add details about a contact.
 *
 * @param {object} event the event object from Google Chat.
 *
 * @return {object} open a dialog.
 */
function openDialog(event) {
  return {
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Name",
                        "type": "SINGLE_LINE",
                        "name": "contactName"
                      }
                    },
                    {
                      "textInput": {
                        "label": "Address",
                        "type": "MULTIPLE_LINE",
                        "name": "address"
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Add to favorites",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "saveFavorite"
                        }
                      }
                    },
                    {
                      "decoratedText": {
                        "text": "Merge with existing contacts",
                        "switchControl": {
                          "controlType": "SWITCH",
                          "name": "mergeContact",
                          "selected": true
                        }
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Next",
                            "onClick": {
                              "action": {
                                "function": "openSequentialDialog"
                              }
                            }
                          }
                        ]
                      }
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  };
}

/**
 * Opens a second dialog that allows users to add more contact details.
 *
 * @param {object} event the event object from Google Chat.
 *
 * @return {object} open a dialog.
 */
function openSequentialDialog(event) {
  return {
    "action_response": {
        "type": "DIALOG",
        "dialog_action": {
          "dialog": {
            "body": {
              "sections": [
                {
                  "header": "Add new contact",
                  "widgets": [
                    {
                      "textInput": {
                        "label": "Notes",
                        "type": "MULTIPLE_LINE",
                        "name": "notes"
                      }
                    },
                    {
                      "selectionInput": {
                        "type": "RADIO_BUTTON",
                        "label": "Contact type",
                        "name": "contactType",
                        "items": [
                          {
                            "text": "Work",
                            "value": "Work",
                            "selected": false
                          },
                          {
                            "text": "Personal",
                            "value": "Personal",
                            "selected": false
                          }
                        ]
                      }
                    },
                    {
                      "buttonList": {
                        "buttons": [
                          {
                            "text": "Submit",
                            "onClick": {
                              "action": {
                                "function": "receiveDialog",
                                "parameters": [
                                  {
                                    "key": "receiveDialog",
                                    "value": "receiveDialog"
                                  }
                                ]
                              }
                            }
                          }
                        ]
                      },
                      "horizontalAlignment": "END"
                    }
                  ]
                }
              ]
            }
          }
        }
    }
  };
}

/**
 * Checks for a form input error, the absence of
 * a "name" value, and returns an error if absent.
 * Otherwise, confirms successful receipt of a dialog.
 *
 * Confirms successful receipt of a dialog.
 *
 * @param {Object} event the event object from Chat API.
 *
 * @return {object} open a Dialog in Google Chat.
 */
function receiveDialog(event) {

  // Checks to make sure the user entered a name
  // in a dialog. If no name value detected, returns
  // an error message.
  if (event.common.formInputs.contactName.stringInputs.value[0] == "") {
    return {
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "Don't forget to name your new contact!"
        }
      }
    };

  // Otherwise the app indicates that it received
  // form data from the dialog. Any value other than "OK"
  // gets returned as an error. "OK" is interpreted as
  // code 200, and the dialog closes.
  } else {
    return {
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "OK"
        }
      }
    };
  }
}

Python

from typing import Any, Mapping

import flask
import functions_framework

@functions_framework.http
def main(req: flask.Request) -> Mapping[str, Any]:
  """Responds to a MESSAGE event in Google Chat that includes the /createContact
     slash command by opening a dialog.

  Args:
      req (flask.Request): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """

  if req.method == 'GET':
    return 'Sorry, this function must be called from a Google Chat.'

  request = req.get_json(silent=True)

  if request.get('type') == 'CARD_CLICKED':
    invoked_function = request.get('common', dict()).get('invokedFunction')
    if invoked_function == 'open_dialog':
      return open_dialog(request)

    elif invoked_function == 'open_sequential_dialog':
      return open_dialog(request)

    elif invoked_function == "receive_dialog":
      return receive_dialog(request)

  else:
    return {
      'cards_v2': [{
        'card_id': 'addContact',
        'card': {
          'header': {
            'title': 'Rolodex',
            'subtitle': 'Manage your contacts!',
            'imageUrl': 'https://www.gstatic.com/images/branding/product/2x/contacts_48dp.png',
            'imageType': 'CIRCLE'
          },
          'sections': [
            {
              'widgets': [
                {
                  'buttonList': {
                    'buttons': [
                      {
                        'text': 'Add Contact',
                        'onClick': {
                                'action': {
                                  'function': 'open_dialog',
                                  'interaction': 'OPEN_DIALOG'
                                }
                        }
                      }
                    ]
                  }
                }
              ]
            }
          ]
        }
      }]
    }

def open_dialog(request: Mapping[str, Any]) -> Mapping[str, Any]:
  """Opens a dialog in Google Chat.

  Args:
      request (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """
  return {
    'action_response': {
      'type': 'DIALOG',
      'dialog_action': {
        'dialog': {
          'body': {
            'sections': [
              {
                'header': 'Add new contact',
                'widgets': [
                  {
                    'textInput': {
                      'label': 'Name',
                      'type': 'SINGLE_LINE',
                      'name': 'name'
                    }
                  },
                  {
                    'textInput': {
                      'label': 'Address',
                      'type': 'MULTIPLE_LINE',
                      'name': 'address'
                    }
                  },
                  {
                    'decoratedText': {
                      'text': 'Add to favorites',
                      'switchControl': {
                        'controlType': 'SWITCH',
                        'name': 'saveFavorite'
                      }
                    }
                  },
                  {
                    'decoratedText': {
                      'text': 'Merge with existing contacts',
                      'switchControl': {
                        'controlType': 'SWITCH',
                        'name': 'mergeContact',
                        'selected': True
                      }
                    }
                  },
                  {
                    'buttonList': {
                      'buttons': [
                        {
                          'text': 'Next',
                          'onClick': {
                            'action': {
                              'function': 'open_sequential_dialog'
                            }
                          }
                        }
                      ]
                    }
                  }
                ]
              }
            ]
          }
        }
      }
    }
  }

def open_sequential_dialog(request: Mapping[str, Any]) -> Mapping[str, Any]:
  """Opens a second dialog that allows users to add more contact details.

  Args:
      request (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """
  return {
    'action_response': {
      'type': 'DIALOG',
      'dialog_action': {
        'dialog': {
              'body': {
                'sections': [
                  {
                    'header': 'Add new contact',
                    'widgets': [
                      {
                        'textInput': {
                          'label': 'Notes',
                          'type': 'MULTIPLE_LINE',
                          'name': 'notes'
                        }
                      },
                      {
                        'selectionInput': {
                          'type': 'RADIO_BUTTON',
                          'label': 'Contact type',
                          'name': 'contactType',
                          'items': [
                            {
                              'text': 'Work',
                              'value': 'Work',
                              'selected': False
                            },
                            {
                              'text': 'Personal',
                              'value': 'Personal',
                              'selected': False
                            }
                          ]
                        }
                      },
                      {
                        'buttonList': {
                          'buttons': [
                            {
                              'text': 'Submit',
                              'onClick': {
                                'action': {
                                  'function': 'receive_dialog',
                                  'parameters': [
                                    {
                                      'key': 'receiveDialog',
                                      'value': 'receiveDialog'
                                    }
                                  ]
                                }
                              }
                            }
                          ]
                        },
                        'horizontalAlignment': 'END'
                      }
                    ]
                  }
                ]
              }
        }
      }
    }
  }

def receive_dialog(event: Mapping[str, Any]) -> Mapping[str, Any]:
  """Checks for a form input error, the absence of a "name" value, and returns
     an error if absent. Otherwise, confirms successful receipt of a dialog.

  Args:
      event (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: the response.
  """

  if event.get('common', dict()) \
      .get('formInputs', dict()).get('contactName', dict()) \
          .get('stringInputs').get('value', list()):
    return {
      'actionResponse': {
        'type': 'DIALOG',
        'dialogAction': {
          'actionStatus': 'OK'
        }
      }
    }
  else:
    return {
      'actionResponse': {
        'type': 'DIALOG',
        'dialogAction': {
          'actionStatus': "Don't forget to name your new contact!"
        }
      }
    }

Limits and considerations

Take note of these dialog limits and considerations:

  • Cards v1, which are deprecated, aren't supported by dialogs. Use cards v2 instead.
  • Some card widgets and properties aren't supported yet, and they won't render if you add them to a dialog card (but we are working hard to support them soon). To see which widgets and properties aren't yet supported, see Card in the Chat REST API reference. If a widget or property isn't supported, its description includes the phrase "Not supported by Chat apps."
  • The following data types of user input aren't supported by Dialogs (but we are working hard to support them soon):
  • Server-generated autocomplete suggestions aren't supported, but suggestions returned with the dialog response are.
  • onChangeAction - a property of some card widgets, like SwitchControl, that specifies an Action to perform when the widget is changed, like flipping a switch - is not supported.

Debug dialogs

As you implement dialogs, you might need to debug your Chat app by reading the app's logs. To read the logs, visit the Logs Explorer on Google Cloud Console.