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Customize Fields at Runtime

The Form component allows you to add/remove items and specify item visibility at runtime. The Form only updates the affected items and does not re-render the entire form.

In this demo, the "Show Address" checkbox specifies the visibility of address-related fields. Review the component's code to see how to set the "HomeAddress" group's visible attribute.

Click the "Add phone" button to add a new phone editor. This action adds a new item to the items array of the "phones" group. Each phone editor contains a button that deletes it from the items array and the Form.

Backend API
<div class="long-title"> <h3>Personal details</h3> </div> <div id="form-container"> <dx-form id="form" [colCount]="2" [formData]="employee"> <dxi-item itemType="group"> <dxi-item itemType="group" caption="Personal Data"> <dxi-item dataField="FirstName"></dxi-item> <dxi-item dataField="LastName"></dxi-item> <dxi-item editorType="dxCheckBox" [editorOptions]="checkBoxOptions" ></dxi-item> </dxi-item> <dxi-item itemType="group"> <dxi-item itemType="group" caption="Home Address" name="HomeAddress" [visible]="isHomeAddressVisible" > <dxi-item dataField="Address"></dxi-item> <dxi-item dataField="City"></dxi-item> </dxi-item> </dxi-item> </dxi-item> <dxi-item itemType="group" caption="Phones" name="phones-container"> <dxi-item itemType="group" name="phones" *ngFor="let phone of phoneOptions; let i = index" > <dxi-item [dataField]="'Phones[' + i + ']'" [editorOptions]="phoneOptions[i]" > <dxo-label [text]="'Phone ' + (i + 1)"> </dxo-label> </dxi-item> </dxi-item> <dxi-item itemType="button" horizontalAlignment="left" cssClass="add-phone-button" [buttonOptions]="addPhoneButtonOptions" > </dxi-item> </dxi-item> </dx-form> </div>
import { NgModule, Component, enableProdMode } from '@angular/core'; import { BrowserModule, BrowserTransferStateModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxFormModule } from 'devextreme-angular'; import { DxCheckBoxTypes } from 'devextreme-angular/ui/check-box'; import { DxButtonTypes } from 'devextreme-angular/ui/button'; import { DxTextBoxTypes } from 'devextreme-angular/ui/text-box'; import { Employee, Service } 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 { employee: Employee; isHomeAddressVisible = true; phoneOptions: DxTextBoxTypes.Properties[] = []; checkBoxOptions: DxCheckBoxTypes.Properties = { text: 'Show Address', value: true, onValueChanged: (e: DxCheckBoxTypes.ValueChangedEvent) => { this.isHomeAddressVisible = e.component.option('value'); }, }; addPhoneButtonOptions: DxButtonTypes.Properties = { icon: 'add', text: 'Add phone', onClick: () => { this.employee.Phones.push(''); this.phoneOptions = this.getPhonesOptions(this.employee.Phones); }, }; constructor(service: Service) { this.employee = service.getEmployee(); this.phoneOptions = this.getPhonesOptions(this.employee.Phones); } getPhonesOptions = (phones: string[]) => phones.map((_, index) => this.generateNewPhoneOptions(index)); generateNewPhoneOptions(index: number): DxTextBoxTypes.Properties { return { mask: '+1 (X00) 000-0000', maskRules: { X: /[01-9]/ }, buttons: [{ name: 'trash', location: 'after', options: { stylingMode: 'text', icon: 'trash', onClick: () => { this.employee.Phones.splice(index, 1); this.phoneOptions = this.getPhonesOptions(this.employee.Phones); }, }, }], }; } } @NgModule({ imports: [ BrowserModule, BrowserTransferStateModule, DxFormModule, ], declarations: [AppComponent], bootstrap: [AppComponent], }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #form-container { margin: 10px 10px 30px; } ::ng-deep .long-title h3 { font-family: 'Segoe UI Light', 'Helvetica Neue Light', 'Segoe UI', 'Helvetica Neue', 'Trebuchet MS', Verdana; font-weight: 200; font-size: 28px; text-align: center; margin-bottom: 20px; } ::ng-deep .add-phone-button { margin-top: 10px; }
import { Injectable } from '@angular/core'; export class Employee { FirstName: string; LastName: string; Address: string; City: string; Phones: string[]; } const employee : Employee = { FirstName: 'John', LastName: 'Heart', Address: '351 S Hill St., Los Angeles, CA', City: 'Atlanta', Phones: ['8005552797', '8005953232'], }; @Injectable() export class Service { getEmployee() : Employee { return employee; } }
// 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.exports = window.exports || {}; window.config = { transpiler: 'ts', typescriptOptions: { module: 'system', emitDecoratorMetadata: true, experimentalDecorators: true, }, meta: { 'typescript': { 'exports': 'ts', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.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@2.6.2/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@1.28.1/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@23.2.5/cjs', 'devextreme/bundles/dx.all': 'npm:devextreme@23.2.5/bundles/dx.all.js', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.6.4/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.5', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.51', 'devextreme-angular': 'npm:devextreme-angular@23.2.5', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.12', '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@3.0.12/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@23.2.5/*/package.json', 'npm:devextreme-angular@23.2.5/ui/*/package.json', 'npm:devextreme-angular@23.2.5/package.json', 'npm:devexpress-diagram@2.2.5/package.json', 'npm:devexpress-gantt@4.1.51/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/23.2.5/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@0.12.0/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>