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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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import React from 'react'; import 'devextreme-react/text-area'; import Form, { GroupItem, SimpleItem, Label } from 'devextreme-react/form'; import service from './data.js'; class App extends React.Component { constructor(props) { super(props); this.employee = service.getEmployee(); this.checkBoxOptions = { text: 'Show Address', value: true, onValueChanged: (e) => { this.setState({ isHomeAddressVisible: e.component.option('value') }); } }; this.addPhoneButtonOptions = { icon: 'add', text: 'Add phone', onClick: () => { this.employee.Phones.push(''); this.updatePhones(); } }; this.state = { phoneOptions: this.getPhonesOptions(), isHomeAddressVisible: true }; this.generateNewPhoneOptions = this.generateNewPhoneOptions.bind(this); this.getPhonesOptions = this.getPhonesOptions.bind(this); this.updatePhones = this.updatePhones.bind(this); } render() { return ( <React.Fragment> <div className="long-title"><h3>Personal details</h3></div> <div className="form-container"> <Form colCount={2} id="form" formData={this.employee}> <GroupItem> <GroupItem> <GroupItem caption="Personal Data"> <SimpleItem dataField="FirstName" /> <SimpleItem dataField="LastName" /> <SimpleItem editorType="dxCheckBox" editorOptions={this.checkBoxOptions} /> </GroupItem> </GroupItem> <GroupItem> <GroupItem caption="Home Address" name="HomeAddress" visible={this.state.isHomeAddressVisible}> <SimpleItem dataField="Address" /> <SimpleItem dataField="City" /> </GroupItem> </GroupItem> </GroupItem> <GroupItem caption="Phones" name="phones-container"> <GroupItem name="phones"> { this.state.phoneOptions.map((phone, index) => <SimpleItem key = {`Phones${ index}`} dataField={`Phones[${index}]`} editorOptions={phone}> <Label text={`Phone ${ index + 1}`} /> </SimpleItem> )} </GroupItem> <SimpleItem itemType="button" horizontalAlignment="left" cssClass="add-phone-button" buttonOptions={this.addPhoneButtonOptions}> </SimpleItem> </GroupItem> </Form> </div> </React.Fragment> ); } getPhonesOptions() { var options = []; for (var i = 0; i < this.employee.Phones.length; i++) { options.push(this.generateNewPhoneOptions(i)); } return options; } generateNewPhoneOptions(index) { 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.updatePhones(); } } }] }; } updatePhones() { this.setState({ phoneOptions: this.getPhonesOptions() }); } } export default App;
import React from 'react'; import ReactDOM from 'react-dom'; import App from './App.js'; ReactDOM.render( <App />, document.getElementById('app') );
<!DOCTYPE html> <html> <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" /> <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import('./index.js'); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"></div> </div> </body> </html>
.form-container { margin: 10px 10px 30px; } .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; } .add-phone-button { margin-top: 10px; }
const employee = { FirstName: 'John', LastName: 'Heart', Address: '351 S Hill St., Los Angeles, CA', City: 'Atlanta', Phones: ['8005552797', '8005953232'] }; export default { getEmployee() { return employee; } };
System.config({ transpiler: 'plugin-babel', paths: { 'npm:': 'https://unpkg.com/' }, defaultExtension: 'js', map: { 'react': 'npm:react@16/umd/react.development.js', 'react-dom': 'npm:react-dom@16/umd/react-dom.development.js', 'prop-types': 'npm:prop-types/prop-types.js', 'devextreme': 'npm:devextreme@19.2', 'devextreme-react': 'npm:devextreme-react@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', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js' }, packages: { 'devextreme': { defaultExtension: 'js' }, 'devextreme-react': { main: 'index.js' } }, babelOptions: { sourceMaps: false, stage0: true, react: true } });