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Form

Customize Fields at Runtime

The Form widget 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 widget'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.

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<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, AfterViewInit } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { DxFormModule } from 'devextreme-angular'; 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 implements AfterViewInit { employee: Employee; isHomeAddressVisible: boolean; checkBoxOptions: any; phoneOptions: any[] = []; addPhoneButtonOptions: any; constructor(service: Service) { this.employee = service.getEmployee(); this.isHomeAddressVisible = true; this.phoneOptions = this.getPhonesOptions(this.employee.Phones); this.checkBoxOptions = { text: "Show Address", value: true, onValueChanged: (e) => { this.isHomeAddressVisible = e.component.option("value"); } }; this.addPhoneButtonOptions = { icon: "add", text: "Add phone", onClick: () => { this.employee.Phones.push(""); this.phoneOptions = this.getPhonesOptions(this.employee.Phones); } }; } getPhonesOptions(phones: any) { let options = []; for (let i = 0; i < phones.length; i++){ options.push(this.generateNewPhoneOptions(i)); } return options; } generateNewPhoneOptions(index: number) { 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, 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[]; } let 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/ System.config({ transpiler: 'ts', typescriptOptions: { module: "commonjs", emitDecoratorMetadata: true, experimentalDecorators: true }, meta: { 'typescript': { "exports": "ts" } }, paths: { 'npm:': 'https://unpkg.com/' }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@3.4.5/lib/typescript.js', '@angular/core': 'npm:@angular/core@8.0.0/bundles/core.umd.js', '@angular/common': 'npm:@angular/common@8.0.0/bundles/common.umd.js', '@angular/compiler': 'npm:@angular/compiler@8.0.0/bundles/compiler.umd.js', '@angular/platform-browser': 'npm:@angular/platform-browser@8.0.0/bundles/platform-browser.umd.js', '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic@8.0.0/bundles/platform-browser-dynamic.umd.js', '@angular/router': 'npm:@angular/router@8.0.0/bundles/router.umd.js', '@angular/forms': 'npm:@angular/forms@8.0.0/bundles/forms.umd.js', '@angular/common/http': 'npm:@angular/common@8.0.0/bundles/common-http.umd.js', 'tslib': 'npm:tslib/tslib.js', 'rxjs': 'npm:rxjs@6.3.3', 'rxjs/operators': 'npm:rxjs@6.3.3/operators', 'devextreme': 'npm:devextreme@19.2', 'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.7/dist/quill.js', 'devexpress-diagram': 'npm:devexpress-diagram', 'devexpress-gantt': 'npm:devexpress-gantt', 'devextreme-angular': 'npm:devextreme-angular@19.2' }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts' }, 'devextreme': { defaultExtension: 'js' }, 'rxjs': { main: 'index.js', defaultExtension: 'js' }, 'rxjs/operators': { main: 'index.js', defaultExtension: 'js' }, 'devextreme-angular': { main: 'index.js', defaultExtension: 'js' } } });
<!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/19.2.4/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.light.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.6.25/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.3/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>