Angular ValidationSummary Methods

The component's default device properties.

Object structure:

Name	Type	Description
device	Device \| Array<Device> \| Function	Device parameters. When specifying a function, get information about the current device from the argument. Return true if the properties should be applied to the device.
options	Object	Options to be applied.

Name

Type

Description

device

Device

|

Array<Device>

|

Function

Device parameters.
When specifying a function, get information about the current device from the argument. Return true if the properties should be applied to the device.

options

Options to be applied.

defaultOptions is a static method that the UI component class supports. The following code demonstrates how to specify default properties for all instances of the ValidationSummary UI component in an application executed on the desktop.

jQuery

JavaScript

DevExpress.ui.dxValidationSummary.defaultOptions({ 
    device: { deviceType: "desktop" },
    options: {
        // Here go the ValidationSummary properties
    }
});

Angular

TypeScript

import ValidationSummary from "devextreme/ui/validation_summary";
// ...
export class AppComponent {
    constructor () {
        ValidationSummary.defaultOptions({
            device: { deviceType: "desktop" },
            options: {
                // Here go the ValidationSummary properties
            }
        });
    }
}

Vue

<template>
    <div>
        <DxValidationSummary id="validationSummary1" />
        <DxValidationSummary id="validationSummary2" />
    </div>
</template>
<script>
import DxValidationSummary from "devextreme-vue/validation-summary";
import ValidationSummary from "devextreme/ui/validation_summary";

ValidationSummary.defaultOptions({
    device: { deviceType: "desktop" },
    options: {
        // Here go the ValidationSummary properties
    }
});

export default {
    components: {
        DxValidationSummary
    }
}
</script>

React

import React, {useEffect} from "react";
import dxValidationSummary from "devextreme/ui/validation_summary";
import ValidationSummary from "devextreme-react/validation-summary";

export default function App() {
    useEffect(() => { 
        dxValidationSummary.defaultOptions({
            device: { deviceType: "desktop" },
            options: {
                // Here go the ValidationSummary properties
            }
        })
    });

    return (
        <div>
            <ValidationSummary id="validationSummary1" />
            <ValidationSummary id="validationSummary2" />
        </div>
    )
}

dispose()

Disposes of all the resources allocated to the ValidationSummary instance.

After calling this method, remove the DOM element associated with the UI component:

JavaScript

$("#myValidationSummary").dxValidationSummary("dispose");
$("#myValidationSummary").remove();

Use this method only if the UI component was created with jQuery or pure JavaScript. In Angular, Vue, and React, use conditional rendering:

Angular

app.component.html

<dx-validation-summary ...
    *ngIf="condition">
</dx-validation-summary>

Vue

App.vue

<template>
    <DxValidationSummary ...
        v-if="condition">
    </DxValidationSummary>
</template>

<script>
import DxValidationSummary from 'devextreme-vue/validation-summary';

export default {
    components: {
        DxValidationSummary
    }
}
</script>

React

App.js

import React from 'react';

import ValidationSummary from 'devextreme-react/validation-summary';

function DxValidationSummary(props) {
    if (!props.shouldRender) {
        return null;
    }

    return (
        <ValidationSummary ... >    
        </ValidationSummary>
    );
}

class App extends React.Component {
    render() {
        return (
            <DxValidationSummary shouldRender="condition" />
        );
    }
}
export default App;

element()

Gets the root UI component element.

Return Value:

HTMLElement | jQuery

An HTML element or a jQuery element when you use jQuery.

endUpdate()

Refreshes the UI component after a call of the beginUpdate() method.

Main article: beginUpdate()

getInstance(element)

Gets the instance of a UI component found using its DOM node.

Parameters:

element:

Element

|

jQuery

The UI component's container.

Return Value:

The UI component's instance.

getInstance is a static method that the UI component class supports. The following code demonstrates how to get the ValidationSummary instance found in an element with the myValidationSummary ID:

// Modular approach
import ValidationSummary from "devextreme/ui/validation_summary";
...
let element = document.getElementById("myValidationSummary");
let instance = ValidationSummary.getInstance(element) as ValidationSummary;

// Non-modular approach
let element = document.getElementById("myValidationSummary");
let instance = DevExpress.ui.dxValidationSummary.getInstance(element);

instance()

Gets the UI component's instance. Use it to access other methods of the UI component.

Return Value:

This UI component's instance.

off(eventName)

Detaches all event handlers from a single event.

Parameters:

eventName:

The event's name.

Return Value:

The object for which this method is called.

off(eventName, eventHandler)

Detaches a particular event handler from a single event.

Parameters:

eventName:

The event's name.

eventHandler:

Function

The event's handler.

Return Value:

The object for which this method is called.

on(eventName, eventHandler)

Subscribes to an event.

Parameters:

eventName:

The event's name.

eventHandler:

Function

The event's handler.

Return Value:

The object for which this method is called.

Use this method to subscribe to one of the events listed in the Events section.

on(events)

Subscribes to events.

Parameters:

events:

Events with their handlers: { "eventName1": handler1, "eventName2": handler2, ...}

Return Value:

The object for which this method is called.

Use this method to subscribe to several events with one method call. Available events are listed in the Events section.

option()

Gets all UI component properties.

Return Value:

The UI component's properties.

option(optionName)

Gets the value of a single property.

Parameters:

optionName:

The property's name or full path.

Return Value: any

This property's value.

option(optionName, optionValue)

Updates the value of a single property.

Parameters:

optionName:

The property's name or full path.

optionValue: any

This property's new value.

option(options)

Updates the values of several properties.

Parameters:

options:

Options with their new values.

repaint()

Repaints the UI component without reloading data. Call it to update the UI component's markup.

resetOption(optionName)

Resets a property to its default value.

Parameters:

optionName: