Radio Group
The RadioGroup component contains a set of radio buttons and allows users to select one item from it. This demo illustrates how to bind the component to data, change the component layout, define a custom template, and handle the value change event.
Bind RadioGroup to Data
You can display RadioGroup items from the items array or a dataSource. If your data is an array of objects, use the displayExpr and valueExpr properties. displayExpr specifies a data source field that contains button captions. valueExpr specifies a data source field that supplies values to the value property when users select a button. Leave valueExpr unspecified if you need to supply the entire data object to the value property.
Configure the Layout
The RadioGroup supports horizontal (default for tablets) and vertical (default for other devices) layouts. To change the layout for all device types, specify the layout property.
Customize the Item Appearance
Define the itemTemplate to customize the item appearance. To customize an individual item, specify its template property.
Handle the Value Change Event
You can set the value property to one of the data source items to specify a predefined selection. Implement the onValueChanged function to handle value changes.
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<div class="form">
<div class="dx-fieldset">
<div class="dx-field">
<div class="dx-field-label">Default mode</div>
<div class="dx-field-value">
<dx-radio-group [items]="priorities" [value]="priorities[0]">
</dx-radio-group>
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">Disabled</div>
<div class="dx-field-value">
<dx-radio-group
[items]="priorities"
[value]="priorities[1]"
[disabled]="true"
>
</dx-radio-group>
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">Horizontal layout</div>
<div class="dx-field-value">
<dx-radio-group
[items]="priorities"
[value]="priorities[0]"
layout="horizontal"
>
</dx-radio-group>
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">Custom item template</div>
<div class="dx-field-value">
<dx-radio-group
[items]="priorities"
[(value)]="colorPriority"
[ngClass]="colorPriority.toLowerCase()"
>
<div *dxTemplate="let priority of 'item'">
<div>{{ priority }}</div>
</div>
</dx-radio-group>
</div>
</div>
<div class="dx-field">
<div class="dx-field-label">Event handling</div>
<div class="dx-field-value">
<dx-radio-group
id="radio-group-with-selection"
[items]="priorityEntities"
valueExpr="id"
displayExpr="text"
[(value)]="selectionPriorityId"
(onValueChanged)="onValueChanged($event)"
>
</dx-radio-group>
</div>
</div>
</div>
<div id="tasks-list">
Tasks by selected priority:
<ul id="list">
<li *ngFor="let data of currentData">
{{ data }}
</li>
</ul>
</div>
</div>
import { NgModule, Component, enableProdMode } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { DxRadioGroupModule, DxTemplateModule } from 'devextreme-angular';
import { PriorityEntity, Service, Task } from './app.service';
if (!/localhost/.test(document.location.host)) {
enableProdMode();
}
@Component({
selector: 'demo-app',
providers: [Service],
templateUrl: 'app/app.component.html',
styleUrls: ['app/app.component.css'],
})
export class AppComponent {
priorities: string[];
priorityEntities: PriorityEntity[];
selectionPriorityId: number;
colorPriority: string;
tasks: Task[];
currentData: string[] = [];
constructor(service: Service) {
this.tasks = service.getTasks();
this.priorities = [
'Low',
'Normal',
'Urgent',
'High',
];
this.priorityEntities = service.getPriorityEntities();
this.colorPriority = this.priorities[2];
this.currentData[0] = this.tasks[1].subject;
this.selectionPriorityId = this.priorityEntities[0].id;
}
onValueChanged($event) {
this.currentData = [];
this.tasks.forEach((item, index) => {
if (item.priority == $event.value) {
this.currentData.push(this.tasks[index].subject);
}
});
}
}
@NgModule({
imports: [
BrowserModule,
DxRadioGroupModule,
DxTemplateModule,
],
declarations: [AppComponent],
bootstrap: [AppComponent],
})
export class AppModule { }
platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep .low .dx-radiobutton-checked .dx-radiobutton-icon .dx-radiobutton-icon-dot {
background: gray;
}
::ng-deep .normal .dx-radiobutton-checked .dx-radiobutton-icon .dx-radiobutton-icon-dot {
background: green;
}
::ng-deep .urgent .dx-radiobutton-checked .dx-radiobutton-icon .dx-radiobutton-icon-dot {
background: orange;
}
::ng-deep .high .dx-radiobutton-checked .dx-radiobutton-icon .dx-radiobutton-icon-dot {
background: red;
}
::ng-deep #radio-group-with-selection {
margin-bottom: 10px;
}
::ng-deep #tasks-list {
margin: 0 0 10px 10px;
white-space: normal;
}
::ng-deep #list {
margin: 10px 0 0 20px;
padding-left: 0;
text-align: left;
}
import { Injectable } from '@angular/core';
export class Task {
subject: string;
priority: number;
}
export class PriorityEntity {
id: number;
text: string;
}
const priorityEntities: PriorityEntity[] = [
{ id: 0, text: 'Low' },
{ id: 1, text: 'Normal' },
{ id: 2, text: 'Urgent' },
{ id: 3, text: 'High' },
];
const tasks: Task[] = [{
subject: 'Choose between PPO and HMO Health Plan',
priority: 3,
}, {
subject: 'Non-Compete Agreements',
priority: 0,
}, {
subject: 'Comment on Revenue Projections',
priority: 1,
}, {
subject: 'Sign Updated NDA',
priority: 2,
}, {
subject: 'Submit Questions Regarding New NDA',
priority: 3,
}, {
subject: 'Rollout of New Website and Marketing Brochures',
priority: 3,
}];
@Injectable()
export class Service {
getTasks(): Task[] {
return tasks;
}
getPriorityEntities(): PriorityEntity[] {
return priorityEntities;
}
}
// In real applications, you should not transpile code in the browser.
// You can see how to create your own application with Angular and DevExtreme here:
// https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/
window.config = {
transpiler: 'ts',
typescriptOptions: {
module: 'system',
emitDecoratorMetadata: true,
experimentalDecorators: true,
},
meta: {
'typescript': {
'exports': 'ts',
},
'devextreme/localization.js': {
'esModule': true,
},
},
paths: {
'npm:': 'https://unpkg.com/',
},
map: {
'ts': 'npm:plugin-typescript@4.2.4/lib/plugin.js',
'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
'@angular/core': 'npm:@angular/core@12.2.17',
'@angular/platform-browser': 'npm:@angular/platform-browser@12.2.17',
'@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@12.2.17',
'@angular/forms': 'npm:@angular/forms@12.2.17',
'@angular/common': 'npm:@angular/common@12.2.17',
'@angular/compiler': 'npm:@angular/compiler@12.2.17',
'tslib': 'npm:tslib@2.3.1/tslib.js',
'rxjs': 'npm:rxjs@7.5.3/dist/bundles/rxjs.umd.js',
'rxjs/operators': 'npm:rxjs@7.5.3/dist/cjs/operators/index.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.0/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@22.2.6/cjs',
'devextreme/bundles/dx.all': 'npm:devextreme@22.2.6/bundles/dx.all.js',
'jszip': 'npm:jszip@3.7.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.5.20/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.1.72',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.43',
'devextreme-angular': 'npm:devextreme-angular@22.2.6',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.11',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.4/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.4/parser-html.js',
},
packages: {
'app': {
main: './app.component.ts',
defaultExtension: 'ts',
},
'devextreme': {
defaultExtension: 'js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
'rxjs': {
defaultExtension: 'js',
},
'rxjs/operators': {
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.11/inferno/package.json',
'npm:@angular/*/package.json',
'npm:@angular/common@12.2.17/*/package.json',
'npm:rxjs@7.5.3/package.json',
'npm:rxjs@7.5.3/operators/package.json',
'npm:devextreme-angular@22.2.6/*/package.json',
'npm:devextreme-angular@22.2.6/ui/*/package.json',
'npm:devextreme-angular@22.2.6/package.json',
'npm:devexpress-diagram@2.1.72/package.json',
'npm:devexpress-gantt@4.1.43/package.json',
],
};
System.config(window.config);
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/22.2.6/css/dx.light.css" />
<script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script>
<script src="https://unpkg.com/zone.js@0.13.0/dist/zone.js"></script>
<script src="https://unpkg.com/reflect-metadata@0.1.13/Reflect.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script src="config.js"></script>
<script>
System.import("app").catch(console.error.bind(console));
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<demo-app>Loading...</demo-app>
</div>
</body>
</html>