DevExtreme Accessibility Compliance
DevExtreme component libraries meet a variety of WCAG and Section 508 compliance standards. To assess this demo’s accessibility level, click the Run AXE® Validation button to launch the AXE® web accessibility evaluation tool.
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The overall accessibility level of your application depends on the TextArea features used.
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Backend API
<template>
<div>
<div class="dx-fieldset">
<div class="dx-fieldset-header">Default Mode</div>
<div class="dx-field">
<DxCheckBox
:value="false"
text="Limit text length"
@value-changed="onCheckboxValueChanged"
/>
</div>
<div class="dx-field">
<DxCheckBox
v-model:value="autoResizeEnabled"
text="Enable auto resize"
@value-changed="onAutoResizeChanged"
/>
</div>
</div>
<div class="textarea-wrapper">
<DxTextArea
v-model:height="height"
:max-length="maxLength"
:input-attr="{ 'aria-label': 'Notes' }"
v-model:value="value"
v-model:auto-resize-enabled="autoResizeEnabled"
/>
</div>
<div class="full-width-content">
<div class="dx-fieldset">
<div class="dx-fieldset-header">Event Handling and API</div>
<div class="dx-field">
<div class="dx-field-label">Synchronize text areas </div>
<div class="dx-field-value">
<DxSelectBox
:items="valueChangeEvents"
v-model:value="eventValue"
:input-attr="{ 'aria-label': 'Event' }"
value-expr="name"
display-expr="title"
/>
</div>
</div>
</div>
<div class="textarea-wrapper">
<DxTextArea
:height="90"
:input-attr="{ 'aria-label': 'Notes' }"
v-model:value="valueForEditableTextArea"
:value-change-event="eventValue"
/>
<DxTextArea
:height="90"
:read-only="true"
:value="valueForEditableTextArea"
:input-attr="{ 'aria-label': 'Notes' }"
/>
</div>
</div>
</div>
</template>
<script setup lang="ts">
import { ref } from 'vue';
import DxTextArea from 'devextreme-vue/text-area';
import DxCheckBox from 'devextreme-vue/check-box';
import DxSelectBox from 'devextreme-vue/select-box';
import service from './data.ts';
const eventValue = ref(service.valueChangeEvents[0].name);
const maxLength = ref(null);
const value = ref(service.getContent());
const valueForEditableTextArea = ref(service.getContent());
const valueChangeEvents = service.valueChangeEvents;
const autoResizeEnabled = ref(false);
const height = ref(90);
function onCheckboxValueChanged(e) {
const str = service.getContent();
value.value = e.value ? str.substring(0, 100) : str;
maxLength.value = e.value ? 100 : null;
}
function onAutoResizeChanged(e) {
height.value = e.value ? undefined : 90;
}
</script>
<style>
.full-width-content {
width: 100%;
margin-top: 30px;
}
.full-width-content .textarea-wrapper > .dx-widget {
margin-bottom: 20px;
}
.full-width-content .dx-field {
max-width: 385px;
}
.textarea-wrapper {
padding: 0 20px;
}
</style>
window.exports = window.exports || {};
window.config = {
transpiler: 'plugin-babel',
meta: {
'*.vue': {
loader: 'vue-loader',
},
'*.ts': {
loader: 'demo-ts-loader',
},
'*.svg': {
loader: 'svg-loader',
},
'devextreme/time_zone_utils.js': {
'esModule': true,
},
'devextreme/localization.js': {
'esModule': true,
},
'devextreme/viz/palette.js': {
'esModule': true,
},
},
paths: {
'root:': '../../../../',
'npm:': 'https://unpkg.com/',
},
map: {
'vue': 'npm:vue@3.2.47/dist/vue.esm-browser.js',
'vue-loader': 'npm:dx-systemjs-vue-browser@1.1.1/index.js',
'demo-ts-loader': 'root:utils/demo-ts-loader.js',
'svg-loader': 'root:utils/svg-loader.js',
'mitt': 'npm:mitt/dist/mitt.umd.js',
'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js',
'es6-object-assign': 'npm:es6-object-assign@1.1.0',
'devextreme': 'npm:devextreme@24.1.7/cjs',
'devextreme-vue': 'npm:devextreme-vue@24.1.7/cjs',
'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.2.12/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@4.1.56/dist/dx-gantt.js',
'@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13',
'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js',
'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js',
'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js',
'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
'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',
// Prettier
'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',
'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',
},
packages: {
'devextreme-vue': {
main: 'index.js',
},
'devextreme': {
defaultExtension: 'js',
},
'devextreme/events/utils': {
main: 'index',
},
'devextreme/events': {
main: 'index',
},
'es6-object-assign': {
main: './index.js',
defaultExtension: 'js',
},
},
packageConfigPaths: [
'npm:@devextreme/*/package.json',
'npm:@devextreme/runtime@3.0.13/inferno/package.json',
],
babelOptions: {
sourceMaps: false,
stage0: true,
},
};
System.config(window.config);
const valueChangeEvents = [{
title: 'On Change',
name: 'change',
}, {
title: 'On Key Up',
name: 'keyup',
}];
const 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,
getContent() {
return content;
},
};
import { createApp } from 'vue';
import App from './App.vue';
createApp(App).mount('#app');
<!DOCTYPE html>
<html lang="en">
<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=5.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.7/css/dx.light.css" />
<script type="module">
import * as vueCompilerSFC from "https://unpkg.com/@vue/compiler-sfc@3.4.16/dist/compiler-sfc.esm-browser.js";
window.vueCompilerSFC = vueCompilerSFC;
</script>
<script src="https://unpkg.com/typescript@4.9.5/lib/typescript.js"></script>
<script src="https://unpkg.com/core-js@2.6.12/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.ts");
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app"> </div>
</div>
</body>
</html>
You can also specify the maxLength property to limit the number of characters a user can enter. Note that this property only limits the number of characters for users. You can enter text that exceeds the maximum character length programmatically, but the number of characters displayed to users will still be limited by this property setting.
The TextArea stores the text in the value property and updates it after the DOM event occurs. To specify which DOM event to use instead of the default "change" event, use the valueChangeEvent property. To handle the value change, use the TextArea's onValueChanged function.
Change the text in the Event Handling and API section below to see how this feature works. Use the "Synchronize text areas" drop-down menu to select which event updates the read-only component's value: "change" or "keyup".