JavaScript/jQuery Form API
The Form UI component 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
Configuration
| Name | Description |
|---|---|
| accessKey |
Specifies the shortcut key that sets focus on the UI component. |
| activeStateEnabled |
Specifies whether or not the UI component 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 UI component responds to user interaction. |
| elementAttr |
Specifies the global attributes to be attached to the UI component's container element. |
| focusStateEnabled |
Specifies whether the UI component can be focused using keyboard navigation. |
| formData |
Provides the Form's data. Gets updated every time form fields change. |
| height |
Specifies the UI component's height. |
| hint |
Specifies text for a hint that appears when a user pauses on the UI component. |
| hoverStateEnabled |
Specifies whether the UI component 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 UI component's content is ready and each time the content is changed. |
| onDisposing |
A function that is executed before the UI component 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 UI component instance. |
| onOptionChanged |
A function that is executed after a UI component property 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 UI component 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 UI component is visible. |
| width |
Specifies the UI component's width. |
See Also
- Configure a Widget: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Methods
| Name | Description |
|---|---|
| beginUpdate() |
Prevents the UI component from refreshing until the endUpdate() method is called. |
| defaultOptions(rule) |
Specifies the device-dependent default configuration properties for this component. |
| dispose() |
Disposes of all the resources allocated to the Form instance. |
| element() |
Gets the root UI component element. |
| endUpdate() |
Refreshes the UI component after a call of the beginUpdate() method. |
| focus() |
Sets focus on the UI component. |
| 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 UI component found using its DOM node. |
| instance() |
Gets the UI component's instance. Use it to access other methods of the UI component. |
| itemOption(id) |
Gets a form item's configuration. |
| itemOption(id, option, value) |
Updates the value of a single item property. |
| itemOption(id, options) |
Updates the values of several item properties. |
| 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 UI component properties. |
| option(optionName) |
Gets the value of a single property. |
| option(optionName, optionValue) |
Updates the value of a single property. |
| option(options) |
Updates the values of several properties. |
| registerKeyHandler(key, handler) |
Registers a handler to be executed when a user presses a specific key. |
| repaint() |
Repaints the UI component without reloading data. Call it to update the UI component's markup. |
| resetOption(optionName) |
Resets an property to its default value. |
| 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 UI component 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
| Name | Description |
|---|---|
| contentReady |
Raised when the UI component's content is ready. |
| disposing |
Raised before the UI component 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 UI component is initialized. |
| optionChanged |
Raised after a UI component property is changed. |
See Also
- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
Item Types
| Name | Description |
|---|---|
| ButtonItem |
Configures a button form item. |
| EmptyItem |
This article describes configuration properties of an empty form item. |
| GroupItem |
This article describes configuration properties of a group form item. |
| SimpleItem |
This article describes configuration properties of a simple form item. |
| TabbedItem |
This article describes configuration properties of a tabbed form item. |