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Text Area
Documentation
The TextArea is a UI component that enables a user to enter and edit a multi-line text.
Feel free to share demo-related thoughts here.
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import React from 'react';
import CheckBox from 'devextreme-react/check-box';
import SelectBox from 'devextreme-react/select-box';
import TextArea from 'devextreme-react/text-area';
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}
defaultValue={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="https://cdn3.devexpress.com/jslib/20.2.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.5/css/dx.light.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>
.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',
meta: {
'devextreme/localization.js': {
"esModule": true
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
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@20.2.5',
'devextreme-react': 'npm:devextreme-react@20.2.5',
'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@0.9.8/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.0.11/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@2.0.18/dist/dx-gantt.js',
'preact': 'npm:preact@10.5.11/dist/preact.js',
'preact/hooks': 'npm:preact@10.5.11/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
}
});