AI-generated Key Takeaways
- 
          A Validation object defines the validation rule for an attached widget. 
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          Validation is available for Google Chat apps and Google Workspace add-ons. 
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          The setCharacterLimitmethod sets the maximum number of characters allowed in a widget.
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          The setInputTypemethod sets the type of input expected for a widget.
An object that defines the validation rule for the widget that it is attached to.
Available for Google Chat apps and Google Workspace add-ons.
const validation = CardService.newValidation().setCharacterLimit('10').setInputType( CardService.InputType.TEXT);
Methods
| Method | Return type | Brief description | 
|---|---|---|
| set | Validation | Sets the character limit of the widget. | 
| set | Validation | Sets the input type of the widget. | 
Detailed documentation
setCharacterLimit(characterLimit)  
Sets the character limit of the widget.
Available for Google Chat apps and Google Workspace add-ons.
Parameters
| Name | Type | Description | 
|---|---|---|
| character | Integer | The character limit to set. Note that this restriction is only effective
    for Textand is ignored for other widgets. | 
Return
Validation — This object, for chaining.
setInputType(inputType)  
Sets the input type of the widget.
Available for Google Chat apps and Google Workspace add-ons.
Parameters
| Name | Type | Description | 
|---|---|---|
| input | Input | The Inputto set. | 
Return
Validation — This object, for chaining.