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Scrolling in JavaScript (ES5) Tree Grid control

14 Apr 2021 / 5 minutes to read

The scrollbar will be displayed in the treegrid when content exceeds the element width or height. The vertical and horizontal scrollbars will be displayed based on the following criteria:

  • The vertical scrollbar appears when the total height of rows present in the treegrid exceeds its element height.
  • The horizontal scrollbar appears when the sum of columns width exceeds the treegrid element width.
  • The height and width are used to set the treegrid height and width, respectively.

The default value for height and width is auto.

Set width and height

To specify the width and height of the scroller in the pixel, set the pixel value to a number.

Source
Preview
index.js
index.html
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var treeGridObj = new ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    height: '315',
    width: '400',
    treeColumnIndex: 1,
    columns: [
        { field: 'taskID', headerText: 'Task ID', width: 90, textAlign: 'Right' },
        { field: 'taskName', headerText: 'Task Name', width: 180 },
        {
            field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date',format: 'yMd'
        },
        { field: 'duration', headerText: 'Duration', width: 110, textAlign: 'Right' }
    ]
});

treeGridObj.appendTo('#TreeGrid');
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<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Grid Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <div id="TreeGrid"></div>        
    </div>

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

Responsive with parent container

Specify the width and height as 100% to make the treegrid element fill its parent container. Setting the height to 100% requires the treegrid parent element to have explicit height.

Source
Preview
index.js
index.html
Copied to clipboard
var treeGridObj = new ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    height: '100%',
    width: '100%',
    treeColumnIndex: 1,
    columns: [
        { field: 'taskID', headerText: 'Task ID', width: 90, textAlign: 'Right' },
        { field: 'taskName', headerText: 'Task Name', width: 180 },
        {
            field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date',format: 'yMd'
        },
        { field: 'duration', headerText: 'Duration', width: 110, textAlign: 'Right' }
    ]
});

treeGridObj.appendTo('#TreeGrid');
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Grid Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    

    <style>
        .e-resizable {
            resize: both;
            overflow: auto;
            border: 1px solid red;
            padding: 10px;
            height: 300px;
            min-height: 250px;
            min-width: 250px;
        }
        .e-text{
            font-family: Helvetica, sans-serif;
            font-size: 14px;
        }
    </style>
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>
<body>
    
    <p class="e-text"> The parent container can be resizable by dragging the bottom-right corner.</p>
    <div id="container" class="e-resizable">
        <div id="TreeGrid" style="height:100%"></div>        
    </div>

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

Scroll to selected row

You can scroll the treegrid content to the selected row position by using the rowSelected event.

Source
Preview
index.js
index.html
Copied to clipboard
var treeGridObj = new ej.treegrid.TreeGrid({
    dataSource: sampleData,
    childMapping: 'subtasks',
    height: '270',
    width: '100%',
    treeColumnIndex: 1,
    columns: [
        { field: 'taskID', headerText: 'Task ID', width: 90, textAlign: 'Right' },
        { field: 'taskName', headerText: 'Task Name', width: 180 },
        {
            field: 'startDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date',format: 'yMd'
        },
        { field: 'duration', headerText: 'Duration', width: 110, textAlign: 'Right' }
    ],
    rowSelected: rowSelected
});

treeGridObj.appendTo('#TreeGrid');

var numeric = new  ej.inputs.NumericTextBox({
    width: 200,
    min: 0,
    showSpinButton: false,
    format: 'N',
    placeholder: 'Enter index to select a row',
    change: onchange
}, '#numeric');

function onchange(){
    treeGridObj.selectRow(parseInt(numeric.getText(), 10));
}

function rowSelected(args) {
    var rowHeight = treeGridObj.getRows()[treeGridObj.getSelectedRowIndexes()[0]].scrollHeight;
    treeGridObj.getContent().children[0].scrollTop = rowHeight * treeGridObj.getSelectedRowIndexes()[0];
}
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 Grid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript Grid Control">
    <meta name="author" content="Syncfusion">
    <link href="index.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <input id="numeric" type="text">
        <div id="TreeGrid"></div>        
    </div>

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

Frozen rows and columns

Frozen rows and columns provides an option to make rows and columns always visible in the top and left side of the treegrid while scrolling.

To use frozen rows and columns support, inject the Freeze module in the treegrid.

In this demo, the frozenColumns is set as ‘2’ and the frozenRows is set as ‘3’. Hence, the left two columns and top three rows are frozen.

Source
Preview
index.js
index.html
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ej.treegrid.TreeGrid.Inject(ej.treegrid.Freeze);
var treegrid = new ej.treegrid.TreeGrid({
        dataSource: sampleData,
        height: 317,
        allowSelection: false,
        frozenRows: 3,
        frozenColumns: 2,
        treeColumnIndex: 1,
        childMapping: 'subtasks',
        columns: [
                { field: 'taskID', headerText: 'Task ID', textAlign: 'Right', width: 100 },
                { field: 'taskName', headerText: 'Task Name', width: 230 },
                { field: 'startDate', headerText: 'Start Date', width: 120, textAlign: 'Right',
                    type: 'date', format: { type: 'dateTime', format: 'dd/MM/yyyy' } },
                { field: 'endDate', headerText: 'End Date', width: 120, textAlign: 'Right',
                    type: 'date', format: { type: 'dateTime', format: 'dd/MM/yyyy' } },
                { field: 'duration', headerText: 'Duration', textAlign: 'Right', width: 110 },
                { field: 'progress', headerText: 'Progress', textAlign: 'Right', width: 120 },
                { field: 'priority', headerText: 'Priority', textAlign: 'Left', width: 120 },
                { field: 'approved', headerText: 'Approved', width: 110, textAlign: 'Left' }
    ]
    });
    treegrid.appendTo('#TreeGrid');
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 TreeGrid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript TreeGrid Control">
    <meta name="author" content="Syncfusion">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet">
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>
<body>
        
    <div id="container">
        <div id="TreeGrid"></div>
    </div>


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

Freeze particular columns

You can use isFrozen property to freeze selected columns in treegrid.

In this demo, the columns with field name taskName and startDate is frozen using the isFrozen property.

Source
Preview
index.js
index.html
Copied to clipboard
ej.treegrid.TreeGrid.Inject(ej.treegrid.Freeze);
var treegrid = new ej.treegrid.TreeGrid({
        dataSource: sampleData,
        height: 317,
        allowSelection: false,
        childMapping: 'subtasks',
        columns: [
                { field: 'taskID', headerText: 'Task ID', textAlign: 'Right', width: 90 },
                { field: 'taskName', headerText: 'Task Name', width: 230, isFrozen: true },
                { field: 'startDate', headerText: 'Start Date', isFrozen: true, width: 120, textAlign: 'Right',
                    type: 'date', format: { type: 'dateTime', format: 'dd/MM/yyyy' } },
                { field: 'endDate', headerText: 'End Date', width: 150, textAlign: 'Right',
                    type: 'date', format: { type: 'dateTime', format: 'dd/MM/yyyy' } },
                { field: 'duration', headerText: 'Duration', textAlign: 'Right', width: 110 },
                { field: 'progress', headerText: 'Progress', textAlign: 'Right', width: 120 },
                { field: 'priority', headerText: 'Priority', textAlign: 'Left', width: 120 },
                { field: 'approved', headerText: 'Approved', width: 110, textAlign: 'Left' }
    ]
    });
    treegrid.appendTo('#TreeGrid');
Copied to clipboard
<!DOCTYPE html><html lang="en"><head>
    <title>EJ2 TreeGrid</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta name="description" content="Typescript TreeGrid Control">
    <meta name="author" content="Syncfusion">
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-calendars/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/ej2-treegrid/styles/material.css" rel="stylesheet">
    
    
    
    <link href="//cdn.syncfusion.com/ej2/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>
<body>
        
    <div id="container">
        <div id="TreeGrid"></div>
    </div>


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

Limitations

The following features are not supported in frozen rows and columns:

  • Row Template
  • Detail Template
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