The Signature web component

An input field to digitally capture a signature as an image.

Demo

Settings

Signature includes the following configurable options when building apps in the IDE.

Custom ruleDisabledEmpty stateEvent handlersForm data keyHiddenHide validation messageShow on desktopShow on mobileLabelAlignmentLabelsPositionWidthWidth (units)Allow wrappingMaintain space when hiddenMarginRequiredAlways show in edit modeShow clear signature button.StylesHelper textValue

Properties

All properties for Signature with supported data types or values. You can write JavaScript almost anywhere in Retool to manipulate or read property values.

customValidation

string

The custom validation message to display if the invalid is true.

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disabled

boolean

Whether input, interaction, selection, or triggering is disabled.

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emptyMessage

string

The message to display if no value is set.

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events

object[]

A list of configured event handlers that trigger actions or queries.

Properties

event

enum

The event type.

Values

change	A user changes the value.
click	A user clicks or taps the component.
submit	A user submits the value.
focus	A user selects the input field.
blur	A user deselects the input field.
scan	A user scans a barcode.
open	A user opens the component.
close	A user closes the component.
true	A user sets the value to true.
false	A user sets the value to false.
select	A user selects a value.
clear	A user clears the value.
upload	A user uploads a file.
parse	An uploaded file is parsed.
inputValueChange	A user changes the value of the input field.

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method

enum

The JavaScript method to perform when type is datasource, widget, state, or localStorage.

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type

enum

The type of action to perform.

Values

datasource	Control query.
widget	Control component.
script	Run script.
state	Set variable.
localStorage	Set localStorage.
util	Perform utility action (e.g., Open URL or Confetti).

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formDataKey

string

The key used by a Form component to assign default values to input fields using form.initialData, and to construct the form.data property.

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global

boolean

Whether the object is globally scoped for use in all app pages.

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hidden

boolean

Whether the component is visible.

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hideValidationMessage

boolean

Whether to hide the validation message if the invalid is true.

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id

string

The unique identifier.

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invalid

boolean

Whether the value has failed any validation rules.

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isHiddenOnDesktop

boolean

Whether the component is visible in the desktop layout.

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isHiddenOnMobile

boolean

Whether the component is visible in the mobile layout.

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label

string

The text label to display.

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labelAlign

enum

The horizontal alignment of the label.

Values

left	Left of the input field.
top	Above the input field.

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labelCaption

string[]

The label for the node.

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labelPosition

enum

The position of the label relative to the input field or value.

Values

top	Above the input field or value.
left	Left of the input field or value.

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labelWidth

number

The label width, in the unit specified in labelWidthUnit.

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labelWidthUnit

enum

The specified units for labelWidth, if labelPosition is left.

Values

%	Percent.
px	Pixels.
col	Columns.

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labelWrap

boolean

Whether the label can wrap to multiple lines.

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maintainSpaceWhenHidden

boolean

Whether the component takes up space on the canvas if hidden is true.

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margin

enum

The amount of margin to render outside.

Values

4px 8px	Normal margin.
0	No margin.

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pluginType

string

The plugin type.

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required

boolean

Whether a value is required.

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showInEditor

boolean

Whether to remain visible in the editor if hidden is true.

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showRedrawIcon

boolean

Whether to display the Clear signature button.

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style

object

Custom style options in use. Not all style options may be available for all components.

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tooltipText

string

The tooltip text to display.

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validationMessage

string

The validation message to display if invalid is true.

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value

string

The value.

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Methods

JavaScript API methods for interacting with Signature. You can write JavaScript almost anywhere in Retool and use methods to manipulate data and property values.

clearValidation

Clear the validation message from the input field.

signature.clearValidation()

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focus

Set focus on the input field.

signature.focus()

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resetValue

Reset the current value to the default value.

signature.resetValue()

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scrollIntoView

Scrolls the canvas or parent container so that the selected component appears in the visible area.

signature.scrollIntoView(scrollIntoViewOptions)

Parameters

scrollIntoViewOptions

object

The scroll options.

Properties

behavior

enum

The scroll behavior.

Values

auto	Scroll immediately to the specified position.
smooth	Scroll gradually to the specified position.

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block

enum

The scroll position relative to the component.

Values

nearest	Scrolls only the minimum amount required for the component to appear in the visible area. Scrolling does not occur if the component is already in view.
start	Scrolls to position the component at the top of the visible area.
center	Scrolls to position the component in the middle of the visible area.
end	Scrolls to position the component at the bottom of the visible area.

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setDisabled

Set the disabled value to toggle whether the input field is disabled. Defaults to true without a parameter.

signature.setDisabled(disabled)

Parameters

disabled

boolean

Whether input, interaction, selection, or triggering is disabled.

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setHidden

Set the hidden value to toggle whether the component is visible. Defaults to true without a parameter.

signature.setHidden(hidden)

Parameters

hidden

boolean

Whether the component is visible.

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validate

Validates the value of the input field.

signature.validate()

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Events

Events are triggered by user interactions, such as clicking a button or entering a value. Use event handlers to trigger queries or other actions in response to events.

change

The value is changed.

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