React Form API
The Form widget represents fields of a data object as a collection of label-editor pairs. These pairs can be arranged in several groups, tabs and columns.
See Also
- Set Up DevExtreme: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
- Configure a Widget: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Props
An object defining configuration options for the Form widget.
| Name | Description |
|---|---|
| accessKey | Specifies the shortcut key that sets focus on the widget. |
| activeStateEnabled | Specifies whether or not the widget changes its state when interacting with a user. |
| alignItemLabels | Specifies whether or not all root item labels are aligned. |
| alignItemLabelsInAllGroups | Specifies whether or not item labels in all groups are aligned. |
| colCount | The count of columns in the form layout. |
| colCountByScreen | Specifies dependency between the screen factor and the count of columns in the form layout. |
| customizeItem | Specifies a function that customizes a form item after it has been created. |
| disabled | Specifies whether the widget responds to user interaction. |
| elementAttr | Specifies the attributes to be attached to the widget's root element. |
| focusStateEnabled | Specifies whether the widget can be focused using keyboard navigation. |
| formData | Provides the Form's data. Gets updated every time form fields change. |
| height | Specifies the widget's height. |
| hint | Specifies text for a hint that appears when a user pauses on the widget. |
| hoverStateEnabled | Specifies whether the widget changes its state when a user pauses on it. |
| items | Holds an array of form items. |
| labelLocation | Specifies the location of a label against the editor. |
| minColWidth | The minimum column width used for calculating column count in the form layout. |
| onContentReady | A function that is executed when the widget's content is ready and each time the content is changed. |
| onDisposing | A function that is executed before the widget is disposed of. |
| onEditorEnterKey | A function that is executed when the Enter key has been pressed while an editor is focused. |
| onFieldDataChanged | A function that is executed when the value of a formData object field is changed. |
| onInitialized | A function used in JavaScript frameworks to save the widget instance. |
| onOptionChanged | A function that is executed after a widget option is changed. |
| optionalMark | The text displayed for optional fields. |
| readOnly | Specifies whether all editors on the form are read-only. Applies only to non-templated items. |
| requiredMark | The text displayed for required fields. |
| requiredMessage | Specifies the message that is shown for end-users if a required field value is not specified. |
| rtlEnabled | Switches the widget to a right-to-left representation. |
| screenByWidth | Specifies a function that categorizes screens by their width. |
| scrollingEnabled | A Boolean value specifying whether to enable or disable form scrolling. |
| showColonAfterLabel | Specifies whether or not a colon is displayed at the end of form labels. |
| showOptionalMark | Specifies whether or not the optional mark is displayed for optional fields. |
| showRequiredMark | Specifies whether or not the required mark is displayed for required fields. |
| showValidationSummary | Specifies whether or not the total validation summary is displayed on the form. |
| tabIndex | Specifies the number of the element when the Tab key is used for navigating. |
| validationGroup | Gives a name to the internal validation group. |
| visible | Specifies whether the widget is visible. |
| width | Specifies the widget's width. |
See Also
- Configure a Widget: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Methods
This section describes members used to manipulate a widget.
| Name | Description |
|---|---|
| beginUpdate() | Prevents the widget from refreshing until the endUpdate() method is called. |
| defaultOptions(rule) | Specifies the device-dependent default configuration options for this component. |
| dispose() | Disposes of all the resources allocated to the Form instance. |
| element() | Gets the root widget element. |
| endUpdate() | Refreshes the widget after a call of the beginUpdate() method. |
| focus() | Sets focus on the widget. |
| getButton(name) | Gets a button's instance. |
| getEditor(dataField) | Gets an editor instance. Takes effect only if the form item is visible. |
| getInstance(element) | Gets the instance of a widget found using its DOM node. |
| instance() | Gets the widget's instance. Use it to access other methods of the widget. |
| itemOption(id) | Gets a form item's configuration. |
| itemOption(id, option, value) | Updates the value of a single item option. |
| itemOption(id, options) | Updates the values of several item options. |
| off(eventName) | Detaches all event handlers from a single event. |
| off(eventName, eventHandler) | Detaches a particular event handler from a single event. |
| on(eventName, eventHandler) | Subscribes to an event. |
| on(events) | Subscribes to events. |
| option() | Gets all widget options. |
| option(optionName) | Gets the value of a single option. |
| option(optionName, optionValue) | Updates the value of a single option. |
| option(options) | Updates the values of several options. |
| registerKeyHandler(key, handler) | Registers a handler to be executed when a user presses a specific key. |
| repaint() | Repaints the widget without reloading data. Call it to update the widget's markup. |
| resetValues() | Resets the editor's value to undefined. |
| updateData(data) | Merges the passed |
| updateData(dataField, value) | Updates a formData field and the corresponding editor. |
| updateDimensions() | Updates the dimensions of the widget contents. |
| validate() | Validates the values of all editors on the form against the list of the validation rules specified for each form item. |
See Also
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Events
This section describes events fired by this widget.
| Name | Description |
|---|---|
| contentReady | Raised when the widget's content is ready. |
| disposing | Raised before the widget is disposed of. |
| editorEnterKey | Raised when the Enter key has been pressed while an editor is focused. |
| fieldDataChanged | Raised when the value of a formData object field is changed. |
| initialized | Raised only once, after the widget is initialized. |
| optionChanged | Raised after a widget option is changed. |
See Also
- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Item Types
This section describes item types available in the Form widget.
| Name | Description |
|---|---|
| ButtonItem | Configures a button form item. |
| EmptyItem | This article describes configuration options of an empty form item. |
| GroupItem | This article describes configuration options of a group form item. |
| SimpleItem | This article describes configuration options of a simple form item. |
| TabbedItem | This article describes configuration options of a tabbed form item. |
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