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Columns Adaptability


The Form widget can use different layouts depending on the screen width. The dependency between column count and the screen width is specified using the colCountByScreen option, which has a higher priority than the colCount and the minColWidth options. In this demo, the form is displayed using a 4-column layout on wide screens and a 2-column layout on narrow screens. Switch between the landscape and portrait layouts to see how the form looks on wide and narrow screens.

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import React from 'react'; import CheckBox from 'devextreme-react/check-box'; import Form from 'devextreme-react/form'; import employee from './data.js'; const colCountByScreen = { sm: 2, md: 3 }; class App extends React.Component { constructor() { super(); this.state = { useColCountByScreen: true }; this.onUseColCountByScreenChanged = this.onUseColCountByScreenChanged.bind(this); } render() { const { useColCountByScreen } = this.state; return ( <div> <Form id="form" formData={employee} colCountByScreen={useColCountByScreen ? colCountByScreen : null} labelLocation="top" minColWidth={233} colCount="auto" screenByWidth={screenByWidth} /> <div className="options"> <div className="caption">Options</div> <div className="option"> <CheckBox text="Set the count of columns regardless of screen size" value={useColCountByScreen} onValueChanged={this.onUseColCountByScreenChanged} /> </div> </div> </div> ); } onUseColCountByScreenChanged(e) { this.setState({ useColCountByScreen: e.value }); } } function screenByWidth(width) { return width < 720 ? 'sm' : 'md'; } 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="" /> <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>
#form { padding: 10px 10px 110px; } .options { padding: 20px; background-color: rgba(191, 191, 191, 0.15); left: 0; position: absolute; bottom: 0; right: 0; } .caption { font-size: 18px; font-weight: 500; } .option { margin-top: 10px; }
export default { 'ID': 1, 'FirstName': 'John', 'LastName': 'Heart', 'CompanyName': 'Super Mart of the West', 'Position': 'CEO', 'OfficeNo': '901', 'BirthDate': new Date(1964, 2, 16), 'HireDate': new Date(1995, 0, 15), 'Address': '351 S Hill St.', 'City': 'Los Angeles', 'State': 'CA', 'Zipcode': '90013', 'Phone': '+1(213) 555-9392', 'Email': '', 'Skype': 'jheart_DX_skype' };
System.config({ transpiler: 'plugin-babel', meta: { }, paths: { 'npm:': '' }, defaultExtension: 'js', map: { 'react': 'npm:react@16.14.0/umd/react.development.js', 'react-dom': 'npm:react-dom@16.14.0/umd/react-dom.development.js', 'prop-types': 'npm:prop-types@15.7.2/prop-types.js', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.25.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@20.2.4', 'devextreme-react': 'npm:devextreme-react@20.2.4', 'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@0.9.7/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.0.5/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@2.0.8/dist/dx-gantt.js', 'preact': 'npm:preact@10.5.7/dist/preact.js', 'preact/hooks': 'npm:preact@10.5.7/hooks/dist/hooks.js', // SystemJS plugins 'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js' }, packages: { 'devextreme': { defaultExtension: 'js' }, 'devextreme-react': { main: 'index.js' }, 'devextreme/events/utils': { main: 'index' }, 'devextreme/events': { main: 'index' }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js' } }, babelOptions: { sourceMaps: false, stage0: true, react: true } });