Validator

A widget that is used to validate the associated DevExtreme editors against the defined validation rules.

Included in: dx.mobile.js, dx.web.js, dx.viz-web.js, dx.all.js
Module: ui/validator
Export: default

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
JavaScript
HTML
$(function() {
    $("#textBox1").dxTextBox({ })
        .dxValidator({
            validationRules: [
                // ...
            ]
        });
});
<div id="textBox1"></div>
Angular
HTML
TypeScript
<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
HTML
<div dx-text-box="{ }"
        dx-validator="{
            validationRules: [
            // ...
        ]
    }">
</div>
Knockout
HTML
<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

View Demo Watch Video

Configuration

An object defining configuration options for the Validator widget.

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 function that is executed before the widget is disposed of.

onInitialized

A function that is executed only once, after the widget is initialized.

onOptionChanged

A function that is executed after a widget option is changed.

onValidated

A function that is executed after a value is validated.

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

This section describes members used to manipulate the widget.

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

This section describes events fired by this widget.

Name Description
disposing

Raised before the widget is disposed of.

initialized

Raised only once, after the widget is initialized.

optionChanged

Raised after a widget option is changed.

validated

Raised after a value is validated.

See Also

Validation Rules

This section lists validation rules that can be used within the dxValidator.

Validation Result

A validation result.

Type:

Object