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Text Area

Text Area


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

Backend API
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window.onload = function () { const valueChangeEvents = [{ title: 'On Blur', name: 'change', }, { title: 'On Key Up', name: 'keyup', }]; const maxLength = ko.observable(null); const value = ko.observable(longText); const eventValue = ko.observable(valueChangeEvents[0].name); const valueForEditableTextArea = ko.observable(longText); const viewModel = { textAreaWithMaxLength: { maxLength, value, height: 90, }, checkBoxOptions: { value: false, onValueChanged(data) { if (data.value) { value(longText.substring(0, 100)); maxLength(100); } else { value(longText); maxLength(null); } }, text: 'Limit text length', }, selectBoxOptions: { items: valueChangeEvents, value: eventValue, valueExpr: 'name', displayExpr: 'title', }, editableTextArea: { value: valueForEditableTextArea, height: 90, valueChangeEvent: eventValue, }, disabledTextArea: { value: valueForEditableTextArea, height: 90, readOnly: true, }, }; ko.applyBindings(viewModel, document.getElementById('text-area-demo')); };
<!DOCTYPE html> <html xmlns=""> <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" /> <script src=""></script> <script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script> <script src=""></script> <link rel="stylesheet" type="text/css" href="" /> <link rel="stylesheet" type="text/css" href="" /> <script src=""></script> <script src="data.js"></script> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="text-area-demo"> <div class="dx-fieldset"> <div class="dx-fieldset-header">Default Mode</div> <div class="dx-field"> <div data-bind="dxCheckBox: checkBoxOptions"></div> </div> </div> <div class="left-content"> <div data-bind="dxTextArea: textAreaWithMaxLength"></div> </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"> <div data-bind="dxSelectBox: selectBoxOptions"></div> </div> </div> </div> <div data-bind="dxTextArea: editableTextArea"></div> <div data-bind="dxTextArea: disabledTextArea"></div> </div> </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 longText = '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.';