Select Google Drive files and folders with Google Picker

To let users select files or folders from Google Drive, you can configure a SelectionInput widget to use the Google Picker. This guide explains how to set up the Google Picker in your add-on's configuration card.

Configure the Google Picker

To enable the selection input widget to select files or folders from Google Drive, you must configure its PlatformDataSource with CommonDataSource and DriveDataSourceSpec.

  1. Set the CommonDataSource to DRIVE. This designates Google Drive as the source for the selection input.
  2. (Optional) To specify which file types users can select, add a DriveDataSourceSpec. You can specify one or more of the following item types:
    • DOCUMENTS
    • SPREADSHEETS
    • PRESENTATIONS
    • PDFS
    • FORMS
    • FOLDERS

Example: Select spreadsheets and PDFs

The following example builds a configuration card that lets users select multiple spreadsheets or PDF files from Google Drive. When the step runs, it returns the file IDs of the selected items as output variables.

JSON

{
  "timeZone": "America/Los_Angeles",
  "exceptionLogging": "STACKDRIVER",
  "runtimeVersion": "V8",
  "addOns": {
    "common": {
      "name": "Drive Picker Demo",
      "logoUrl": "https://www.gstatic.com/images/icons/material/system/1x/pets_black_48dp.png",
      "useLocaleFromApp": true
    },
    "flows": {
      "workflowElements": [
        {
          "id": "file_selection",
          "state": "ACTIVE",
          "name": "File selection",
          "workflowAction": {
            "inputs": [
              {
                "id": "drive_picker_1",
                "description": "Choose a file from Google Drive",
                "dataType": {
                  "basicType": "STRING"
                }
              }
            ],
            "outputs": [
              {
                "id": "fileId",
                "description": "The id of the selected file",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "STRING"
                }
              }
            ],
            "onConfigFunction": "onConfig",
            "onExecuteFunction": "onExecute"
          }
        }
      ]
    }
  }
}

Apps Script

/**
 * Returns a configuration card for the step.
 * This card includes a selection input widget configured as a Google Picker
 * that lets users select spreadsheets and PDFs.
 */
function onConfig() {
  // Allows users to select either spreadsheets or PDFs
  const driveSpec = CardService.newDriveDataSourceSpec()
    .addItemType(
      CardService.DriveItemType.SPREADSHEETS
    )
    .addItemType(
      CardService.DriveItemType.PDFS
    );

  const platformSource = CardService.newPlatformDataSource()
    .setCommonDataSource(
      CardService.CommonDataSource.DRIVE
    )
    .setDriveDataSourceSpec(driveSpec);

  const selectionInput =
    CardService.newSelectionInput()
      .setFieldName("drive_picker_1")
      .setPlatformDataSource(platformSource)
      .setTitle("Drive Picker")
      .setType(
        CardService.SelectionInputType.MULTI_SELECT
      );

  var sectionBuilder =
    CardService.newCardSection()
      .addWidget(selectionInput)

  return CardService.newCardBuilder()
    .addSection(sectionBuilder)
    .build();
}

/**
 * Executes when the step runs.
 * This function retrieves the file ID of the item selected in the Google Picker
 * and returns it as an output variable.
 * @param {Object} event The event object passed by the Flows runtime.
 * @return {Object} The output variables object.
 */
function onExecute(event) {
  //Extract the selected file's ID during execution
  console.log("eventObject: " + JSON.stringify(event));
  var fileId = event.workflow.actionInvocation.inputs["drive_picker_1"].stringValues[0];

  const variableData = AddOnsResponseService.newVariableData()
    .addStringValue(fileId);

  let textFormatElement = AddOnsResponseService.newTextFormatElement()
    .setText("A file has been selected!");

  let workflowTextFormat = AddOnsResponseService.newWorkflowTextFormat()
    .addTextFormatElement(textFormatElement);

  let workflowAction = AddOnsResponseService.newReturnOutputVariablesAction()
    .addVariableData("fileId", variableData)
    .setLog(workflowTextFormat);

  let hostAppAction = AddOnsResponseService.newHostAppAction()
    .setWorkflowAction(workflowAction);

  return AddOnsResponseService.newRenderActionBuilder()
    .setHostAppAction(hostAppAction)
    .build();
}