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Text Area

Text Area


The TextArea is a widget that enables a user to enter and edit a multi-line text.

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import React from 'react'; import { CheckBox, SelectBox, TextArea } from 'devextreme-react'; import service from './data.js'; const valueChangeEvents = service.valueChangeEvents; class App extends React.Component { constructor(props) { super(props); this.state = { value: service.getContent(), valueForEditableTestArea: service.getContent(), maxLength: null, eventValue: valueChangeEvents[0].name }; this.onCheckboxValueChanged = this.onCheckboxValueChanged.bind(this); this.onSelectBoxValueChanged = this.onSelectBoxValueChanged.bind(this); this.onTextAreaValueChanged = this.onTextAreaValueChanged.bind(this); } render() { return ( <React.Fragment> <div className={'dx-fieldset'}> <div className={'dx-fieldset-header'}>Default Mode</div> <div className={'dx-field'}> <CheckBox defaultValue={false} onValueChanged={this.onCheckboxValueChanged} text={'Limit text length'}></CheckBox> </div> </div> <div className={'left-content'}> <TextArea height={90} maxLength={this.state.maxLength} value={this.state.value} /> </div> <div className={'full-width-content'}> <div className={'dx-fieldset'}> <div className={'dx-fieldset-header'}>Event Handling and API</div> <div className={'dx-field'}> <div className={'dx-field-label'}>Synchronize text areas </div> <div className={'dx-field-value'}> <SelectBox items={valueChangeEvents} valueExpr={'name'} displayExpr={'title'} value={this.state.eventValue} onValueChanged={this.onSelectBoxValueChanged} /> </div> </div> </div> <TextArea height={90} value={this.state.valueForEditableTestArea} valueChangeEvent={this.state.eventValue} onValueChanged={this.onTextAreaValueChanged} /> <TextArea height={90} value={this.state.valueForEditableTestArea} readonly={true} valueChangeEvent={this.state.eventValue} /> </div> </React.Fragment> ); } onCheckboxValueChanged(e) { if (e.value) { this.setState({ value: service.getContent().substring(0, 100), maxLength: 100, }); } else { this.setState({ value: service.getContent(), maxLength: null }); } } onSelectBoxValueChanged(e) { this.setState({ eventValue: e.value }); } onTextAreaValueChanged(e) { this.setState({ valueForEditableTestArea: e.value }); } } 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="" /> <link rel="stylesheet" type="text/css" href="" /> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src=""></script> <script src=""></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>
.full-width-content { width: 100%; margin-top: 30px; } .full-width-content > .dx-widget { margin-bottom: 20px; } .full-width-content .dx-field { max-width: 385px; }
const valueChangeEvents = [{ title: 'On Blur', name: 'change' }, { title: 'On Key Up', name: 'keyup' }]; let content = 'Prepare 2013 Marketing Plan: We need to double revenues in 2013 and our marketing strategy is going to be key here. R&D is improving existing products and creating new products so we can deliver great AV equipment to our customers.Robert, please make certain to create a PowerPoint presentation for the members of the executive team.'; export default { valueChangeEvents: valueChangeEvents, getContent() { return content; } };
System.config({ transpiler: 'plugin-babel', paths: { 'npm:': '' }, 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@19.1', 'devextreme-react': 'npm:devextreme-react@19.1', 'jszip': 'npm:jszip@3.1.3/dist/jszip.min.js', 'quill': 'npm:quill@1.3.6/dist/quill.js', 'devexpress-diagram': 'npm:devexpress-diagram', // 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 } });