Form widget

Form is a wrapper widget for inputs such as TextInput, Dropdown, Checkbox, etc. Form enables you to perform validation and styling on inputs inside the Form.

Detailed Example of validating/submitting a Form from inside a form or outside (opens in a new tab)

Validate and Submit

Submit a Form from a Button inside a Form

To trigger validation of a Form's children inputs, add a Button widget with the property of validateForm: true. In this example, following validations will be performed when the submit button is pressed. If validateForm: true, Form will be submitted only if validation passes.

View:
  body:
    Form:
      onSubmit:
        invokeAPI:
          name: addAccount
          inputs:
            name: ${name.value}
            email: ${email.value}
        onResponse:
          # perform additional action here
        onError:
          # perform additional action here
      children:
        - TextInput:
            id: name
            label: First and last name
            required: true
        - TextInput:
            id: email
            label: Email
            required: true
            inputType: email
        - Button:
            label: Submit
            validateForm: true
            submitForm: true
 
API:
  addAccount:
    inputs:
      - name
      - email
    method: POST
    uri: https://sample.api/user
    body:
      name: ${name}
      email: ${email}

Validate or Submit a Form from outside the Form

Detailed Example here (opens in a new tab) This examples shows how to validate/submit a form from a sticky button in the footer. This is a common pattern in mobile apps.

By default, when Form.submit() is called, it first called Form.validate() and calls submit only if the validation succeeds (i.e. all form fields are in valid state.

Following is a snippet from the example above

  footer:
    styles:
      backgroundColor: white
    children:
      - Button:
          styles:
            backgroundColor: black
            borderRadius: 40
            padding: 20
          label: Submit
          onTap: |-
            basicForm.validate();
            complexForm.submit();

Styling

You can control the styling of inputs' label at the Form level, by setting labelPosition, labelMaxWidth, and labelOverflow properties under Form's style.

Use labelStyle to control the detailed styling of all the labels. Note that an Input widget's own labelStyle will take precedence over the Form's labelStyle.

View:
  body:
    Form:
      styles:
        labelPosition: start
        labelMaxWidth: 100
        labelOverflow: clip
        # all labels will have a bolder weight
        labelStyle:
          fontWeight: w600
      children:
        - TextInput:
            label: Name
            required: true
        - TextInput:
            label: email
            required: true
            inputType: email
            styles:
              # setting this will ignore the Form's labelStyle
              labelStyle:
                color: red
        - Button:
            label: Submit
            validateForm: true

Properties

Property	Type	Description
enabled	boolean	Enables or disables the interactivity and input functionality of the Form
onSubmit	action	Action to execute when the form is submitted
children	array	List of widgets
styles	object	see properties

Styles

Property	Type	Description
labelPosition	string	Where the position the FormField's label `top` `start` `none`
labelOverflow	string	Treatment of text longer than available space `wrap` `visible` `clip` `ellipsis`
labelMaxWidth	integer	Cap the label's width, useful on larger screen. This property only works on labelPosition=start.
labelStyle	TextStyle	Styling for the label
width	integer	The width property determines the horizontal size of an element, allowing control over its width dimension within the layout.
height	integer	The height property determines the vertical size of an element, allowing control over its height dimension within the layout.
gap	integer	Vertical gap to insert between the children (default is 10)

Methods

Function	Return Type	Description
validate()	boolean	validates each formfield inside the Form. Returns true if all the fields are valid and false otherwise
submit()	none	submits the form

Flow Gridview