Checkbox in EJ2 JavaScript Drop down tree control

2 May 202317 minutes to read

The Dropdown Tree control allows you to check more than one item from the tree without affecting the UI’s appearance by enabling the showCheckBox property. When this property is enabled, checkbox appears before each item text in the popup.

In the following example, the showCheckBox property is enabled.

var localData = [
    { id: 1, name: 'Discover Music', hasChild: true, expanded: true },
    { id: 2, pid: 1, name: 'Hot Singles' },
    { id: 3, pid: 1, name: 'Rising Artists' },
    { id: 4, pid: 1, name: 'Live Music' },
    { id: 6, pid: 1, name: 'Best of 2017 So Far' },
    { id: 7, name: 'Sales and Events', hasChild: true },
    { id: 8, pid: 7, name: '100 Albums - $5 Each' },
    { id: 9, pid: 7, name: 'Hip-Hop and R&B Sale' },
    { id: 10, pid: 7, name: 'CD Deals' },
    { id: 11, name: 'Categories', hasChild: true },
    { id: 12, pid: 11, name: 'Songs' },
    { id: 13, pid: 11, name: 'Bestselling Albums' },
    { id: 14, pid: 11, name: 'New Releases' },
    { id: 15, pid: 11, name: 'Bestselling Songs' },
    { id: 16, name: 'MP3 Albums', hasChild: true },
    { id: 17, pid: 16, name: 'Rock' },
    { id: 18, pid: 16, name: 'Gospel' },
    { id: 19, pid: 16, name: 'Latin Music' },
    { id: 20, pid: 16, name: 'Jazz' },
    { id: 21, name: 'More in Music', hasChild: true },
    { id: 22, pid: 21, name: 'Music Trade-In' },
    { id: 23, pid: 21, name: 'Redeem a Gift Card' },
    { id: 24, pid: 21, name: 'Band T-Shirts' },
];

var DropDownTreeObj = new ej.dropdowns.DropDownTree({
    fields: { dataSource: localData, value: 'id', parentValue: 'pid', text: 'name', hasChildren: 'hasChild' },
    showCheckBox: true
});
DropDownTreeObj.appendTo('#ddltreeelement');
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 DropDownList</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="styles.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-dropdowns/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/23.1.36/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="margin:0 auto; width:250px;">
        <input type="text" tabindex="1" id="ddltreeelement">
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Auto Check

By default, the checkbox state of the parent and child items in the Dropdown Tree will not be dependent over each other. If you need dependent checked state, then enable the autoCheck property which is a member of treeSettings property.

  • If one or more child items are not in the checked state, then the parent item will be in the intermediate state.

  • If all the child items are checked, then the parent item will also be in the checked state.

  • If a parent item is checked, then all the child items will also be changed to the checked state.

In the following example, the autoCheck property is enabled.

var localData = [
    { id: 1, name: 'Discover Music', hasChild: true, expanded: true },
    { id: 2, pid: 1, name: 'Hot Singles' },
    { id: 3, pid: 1, name: 'Rising Artists' },
    { id: 4, pid: 1, name: 'Live Music' },
    { id: 6, pid: 1, name: 'Best of 2017 So Far' },
    { id: 7, name: 'Sales and Events', hasChild: true },
    { id: 8, pid: 7, name: '100 Albums - $5 Each' },
    { id: 9, pid: 7, name: 'Hip-Hop and R&B Sale' },
    { id: 10, pid: 7, name: 'CD Deals' },
    { id: 11, name: 'Categories', hasChild: true },
    { id: 12, pid: 11, name: 'Songs' },
    { id: 13, pid: 11, name: 'Bestselling Albums' },
    { id: 14, pid: 11, name: 'New Releases' },
    { id: 15, pid: 11, name: 'Bestselling Songs' },
    { id: 16, name: 'MP3 Albums', hasChild: true },
    { id: 17, pid: 16, name: 'Rock' },
    { id: 18, pid: 16, name: 'Gospel' },
    { id: 19, pid: 16, name: 'Latin Music' },
    { id: 20, pid: 16, name: 'Jazz' },
    { id: 21, name: 'More in Music', hasChild: true },
    { id: 22, pid: 21, name: 'Music Trade-In' },
    { id: 23, pid: 21, name: 'Redeem a Gift Card' },
    { id: 24, pid: 21, name: 'Band T-Shirts' },
];

var DropDownTreeObj = new ej.dropdowns.DropDownTree({
    fields: { dataSource: localData, value: 'id', parentValue: 'pid', text: 'name', hasChildren: 'hasChild' },
    showCheckBox: true,
    treeSettings: { autoCheck: true }
});
DropDownTreeObj.appendTo('#ddltreeelement');
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 DropDownList</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="styles.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-dropdowns/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/23.1.36/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="margin:0 auto; width:250px;">
        <input type="text" tabindex="1" id="ddltreeelement">
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>

Select All

The Dropdown Tree control has in-built support to select all the tree items using Select All options in the header.

When the showSelectAll property is set to true, a checkbox will be displayed in the popup header that allows you to select or deselect all the tree items in the popup.

By default, Select All and unSelect All text values will be showcased along with the checkbox in the popup header to indicate the action to be performed on checking or unchecking the checkbox. You can customize these name attributes by using selectAllText and unSelectAllText properties respectively.

var localData = [
    { id: 1, name: 'Discover Music', hasChild: true, expanded: true },
    { id: 2, pid: 1, name: 'Hot Singles' },
    { id: 3, pid: 1, name: 'Rising Artists' },
    { id: 4, pid: 1, name: 'Live Music' },
    { id: 6, pid: 1, name: 'Best of 2017 So Far' },
    { id: 7, name: 'Sales and Events', hasChild: true },
    { id: 8, pid: 7, name: '100 Albums - $5 Each' },
    { id: 9, pid: 7, name: 'Hip-Hop and R&B Sale' },
    { id: 10, pid: 7, name: 'CD Deals' },
    { id: 11, name: 'Categories', hasChild: true },
    { id: 12, pid: 11, name: 'Songs' },
    { id: 13, pid: 11, name: 'Bestselling Albums' },
    { id: 14, pid: 11, name: 'New Releases' },
    { id: 15, pid: 11, name: 'Bestselling Songs' },
    { id: 16, name: 'MP3 Albums', hasChild: true },
    { id: 17, pid: 16, name: 'Rock' },
    { id: 18, pid: 16, name: 'Gospel' },
    { id: 19, pid: 16, name: 'Latin Music' },
    { id: 20, pid: 16, name: 'Jazz' },
    { id: 21, name: 'More in Music', hasChild: true },
    { id: 22, pid: 21, name: 'Music Trade-In' },
    { id: 23, pid: 21, name: 'Redeem a Gift Card' },
    { id: 24, pid: 21, name: 'Band T-Shirts' },
];

var DropDownTreeObj = new ej.dropdowns.DropDownTree({
    fields: { dataSource: localData, value: 'id', parentValue: 'pid', text: 'name', hasChildren: 'hasChild' },
    showCheckBox: true,
	showSelectAll: true,
    selectAllText: 'Check All',
    unSelectAllText: 'UnCheck All'
});
DropDownTreeObj.appendTo('#ddltreeelement');
<!DOCTYPE html><html lang="en"><head>
    <title>Essential JS 2 DropDownList</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript UI Controls">
    <meta name="author" content="Syncfusion">
    <link href="styles.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-base/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="https://cdn.syncfusion.com/ej2/23.1.36/ej2-dropdowns/styles/material.css" rel="stylesheet">
    
    
<script src="https://cdn.syncfusion.com/ej2/23.1.36/dist/ej2.min.js" type="text/javascript"></script>
<script src="https://cdn.syncfusion.com/ej2/syncfusion-helper.js" type ="text/javascript"></script>
</head>

<body>
    
    <div id="container" style="margin:0 auto; width:250px;">
        <input type="text" tabindex="1" id="ddltreeelement">
    </div>


<script>
var ele = document.getElementById('container');
if(ele) {
  ele.style.visibility = "visible";
}   
      </script>
<script src="index.js" type="text/javascript"></script>
</body></html>