jQuery Validator API
A widget that is used to validate the associated DevExtreme editors against the defined validation rules.
DevExtreme widgets are integrated with many popular libraries and frameworks. See the Installation section (for JavaScript libraries) or the Prerequisites and Installation section (for ASP.NET MVC framework) to find details on setting up DevExtreme with a particular library or framework.
The following code shows how to create the Validator widget using every supported library and framework. For more details on working with widgets in these libraries and frameworks, see the Widget Basics topic for jQuery, Angular, AngularJS, Knockout or ASP.NET MVC.
jQuery
$(function() {
$("#textBox1").dxTextBox({ })
.dxValidator({
validationRules: [
// ...
]
});
});<div id="textBox1"></div>
Angular
<dx-text-box>
<dx-validator>
<dxi-validation-rule type="required" message="Value is required"></dxi-validation-rule>
</dx-validator>
</dx-text-box>
import { DxValidatorModule, DxTextBoxModule } from 'devextreme-angular'
// ...
export class AppComponent {
// ...
}
@NgModule({
imports: [
// ...
DxValidatorModule,
DxTextBoxModule
],
// ...
})AngularJS
<div dx-text-box="{ }"
dx-validator="{
validationRules: [
// ...
]
}">
</div>Knockout
<div data-bind="dxTextBox: { },
dxValidator: {
validationRules: [
// ...
]
}">
</div>See Also
The learn the validation rules that can be defined using the Validator widget for an editor, refer to the Validation Rules section.
The editors that are associated with the Validator widgets are automatically validated against the specified rules each time the event assigned to the editor's valueChangeEvent option occurs. In addition, several editors can be validated at once. To learn how to do this, refer to the Validate Several Editor Values topic.
See Also
Configuration
| Name | Description |
|---|---|
| adapter |
An object that specifies what and when to validate, and how to apply the validation result. |
| elementAttr |
Specifies the attributes to be attached to the widget's root element. |
| height |
Specifies the widget's height. |
| name |
Specifies the editor name to be used in the validation default messages. |
| onDisposing |
A handler for the disposing event. Executed when the widget is removed from the DOM using the remove(), empty(), or html() jQuery methods only. |
| onInitialized |
A handler for the initialized event. Executed only once, after the widget is initialized. |
| onOptionChanged |
A handler for the optionChanged event. Executed after an option of the widget is changed. |
| onValidated |
A handler for the validated event. |
| validationGroup |
Specifies the validation group the editor will be related to. |
| validationRules |
An array of validation rules to be checked for the editor with which the dxValidator object is associated. |
| width |
Specifies the widget's width. |
Methods
| Name | Description |
|---|---|
| dispose() |
Disposes of all the resources allocated to the Validator instance. |
| element() |
Gets the root widget element. |
| focus() |
Sets focus to the editor associated with the current Validator object. |
| 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. |
| 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. |
| reset() |
Resets the value and validation result of the editor associated with the current Validator object. |
| validate() |
Validates the value of the editor that is controlled by the current Validator object against the list of the specified validation rules. |
Events
| Name | Description |
|---|---|
| disposing |
Raised when the widget is removed from the DOM using the remove(), empty(), or html() jQuery methods only. |
| initialized |
Raised only once, after the widget is initialized. |
| optionChanged |
Raised after a widget option is changed. |
| validated |
Fires after an editor value is validated against the specified validation rules. |