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Backend API
$(() => {
const selectedEmployeesList = $('#selected-employees').dxList({
width: 400,
height: 200,
showScrollbar: 'always',
itemTemplate(item) {
return `<div>${item.prefix} ${item.fullName} (${item.position})</div>`;
},
}).dxList('instance');
const treeView = $('#treeview').dxTreeView({
items: employees,
width: 340,
height: 320,
showCheckBoxesMode: 'normal',
onSelectionChanged(e) {
syncSelection(e.component);
},
onContentReady(e) {
syncSelection(e.component);
},
itemTemplate(item) {
return `<div>${item.fullName} (${item.position})</div>`;
},
}).dxTreeView('instance');
function syncSelection(treeViewInstance) {
const selectedEmployees = treeViewInstance.getSelectedNodes()
.map((node) => node.itemData);
selectedEmployeesList.option('items', selectedEmployees);
}
$('#showCheckBoxesMode').dxSelectBox({
items: ['normal', 'selectAll', 'none'],
inputAttr: { 'aria-label': 'Show Checkboxes Mode' },
value: 'normal',
onValueChanged(e) {
treeView.option('showCheckBoxesMode', e.value);
if (e.value === 'selectAll') {
selectionModeSelectBox.option('value', 'multiple');
recursiveCheckBox.option('disabled', false);
}
selectionModeSelectBox.option('disabled', e.value === 'selectAll');
},
});
const selectionModeSelectBox = $('#selectionMode').dxSelectBox({
items: ['multiple', 'single'],
value: 'multiple',
inputAttr: { 'aria-label': 'Selection Mode' },
onValueChanged(e) {
treeView.option('selectionMode', e.value);
if (e.value === 'single') {
recursiveCheckBox.option('value', false);
treeView.unselectAll();
}
recursiveCheckBox.option('disabled', e.value === 'single');
},
}).dxSelectBox('instance');
const recursiveCheckBox = $('#selectNodesRecursive').dxCheckBox({
text: 'Select Nodes Recursive',
value: true,
onValueChanged(e) {
treeView.option('selectNodesRecursive', e.value);
},
}).dxCheckBox('instance');
$('#selectByClick').dxCheckBox({
text: 'Select By Click',
value: false,
onValueChanged(e) {
treeView.option('selectByClick', e.value);
},
});
});
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" 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" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.2.3/css/dx.light.css" />
<script src="js/dx.all.js"></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 class="form">
<h4>Employees</h4>
<div id="treeview"></div>
<div class="selected-container">
Selected employees
<div id="selected-employees"></div>
</div>
</div>
<div class="options">
<div class="caption">Options</div>
<div class="options-container">
<div class="option">
<span>Show Check Boxes Mode:</span>
<div class="editor-container">
<div id="showCheckBoxesMode"></div>
</div>
</div>
<div class="option">
<span>Selection Mode:</span>
<div class="editor-container">
<div id="selectionMode"></div>
</div>
</div>
<div class="option">
<div class="caption-placeholder"> </div>
<div class="editor-container">
<div id="selectNodesRecursive"></div>
</div>
</div>
<div class="option">
<div class="caption-placeholder"> </div>
<div class="editor-container">
<div id="selectByClick"></div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>
.form > h4 {
margin-bottom: 20px;
}
.form > div,
#treeview {
display: inline-block;
vertical-align: top;
}
.selected-container {
padding: 20px;
margin-left: 20px;
background-color: rgba(191, 191, 191, 0.15);
font-size: 115%;
font-weight: bold;
}
#selected-employees {
margin-top: 20px;
}
.selected-container .dx-list-item-content {
padding-left: 0;
}
.options {
padding: 20px;
background-color: rgba(191, 191, 191, 0.15);
margin-top: 20px;
box-sizing: border-box;
}
.caption {
font-size: 18px;
font-weight: 500;
}
.option {
width: 24%;
margin-top: 10px;
margin-right: 9px;
box-sizing: border-box;
display: flex;
flex-direction: column;
justify-content: center;
}
.options-container {
display: flex;
justify-content: space-between;
align-items: stretch;
}
.editor-container {
height: 100%;
display: flex;
align-items: center;
}
.editor-container > * {
width: 100%;
}
.option:last-of-type {
margin-right: 0;
}
const employees = [{
id: 1,
fullName: 'John Heart',
prefix: 'Dr.',
position: 'CEO',
expanded: true,
items: [{
id: 2,
fullName: 'Samantha Bright',
prefix: 'Dr.',
position: 'COO',
expanded: true,
items: [{
id: 3,
fullName: 'Kevin Carter',
prefix: 'Mr.',
position: 'Shipping Manager',
}, {
id: 14,
fullName: 'Victor Norris',
prefix: 'Mr.',
selected: true,
position: 'Shipping Assistant',
}],
}, {
id: 4,
fullName: 'Brett Wade',
prefix: 'Mr.',
position: 'IT Manager',
expanded: true,
items: [{
id: 5,
fullName: 'Amelia Harper',
prefix: 'Mrs.',
position: 'Network Admin',
}, {
id: 6,
fullName: 'Wally Hobbs',
prefix: 'Mr.',
position: 'Programmer',
}, {
id: 7,
fullName: 'Brad Jameson',
prefix: 'Mr.',
position: 'Programmer',
}, {
id: 8,
fullName: 'Violet Bailey',
prefix: 'Ms.',
position: 'Jr Graphic Designer',
}],
}, {
id: 9,
fullName: 'Barb Banks',
prefix: 'Mrs.',
position: 'Support Manager',
expanded: true,
items: [{
id: 10,
fullName: 'Kelly Rodriguez',
prefix: 'Ms.',
position: 'Support Assistant',
}, {
id: 11,
fullName: 'James Anderson',
prefix: 'Mr.',
position: 'Support Assistant',
}],
}],
}];
Use the following JavaScript TreeView properties to adjust selection:
-
selectionMode
Specifies whether multiple node selection is allowed. -
selectNodesRecursive
Specifies whether nested nodes are selected together with their parent. -
selectedExpr
A data field that allows you to pre-select a node. In this demo, the data field is called selected, and it is set to true for the "Victor Norris" node (see the data source). -
onSelectionChanged
A function that allows you to handle selection changes. In this demo, it is used to synchronize the List with the JavaScript TreeView.
The JavaScript TreeView also provides the following methods to manage selection programmatically:
-
selectItem / unselectItem
Selects or unselects a single node. Accepts the node key, data object, or DOM node. -
selectAll() / unselectAll()
Selects or unselects all nodes. -
getSelectedNodes() / getSelectedNodeKeys()
Gets the selected nodes or their keys. In this demo, getSelectedNodes() is used to prepare data for the List.
This demo also shows how to specify an itemTemplate for node customization. Node data is passed to the template as an argument.