Refresh the data source in JavaScript (ES5) Tree Grid control

31 Mar 2023 / 2 minutes to read

How to refresh the datasource

You can add/delete the datasource records through an external button. To reflect the datasource changes in Tree Grid, you need to assign the modified data to dataSource property.

Please follow the below steps to refresh the Tree Grid after datasource change.

Step 1:

Add/delete the data source record by using the following code.

    treegrid.dataSource.unshift(data); // add a new record.

    treegrid.dataSource.splice(selectedRow, 1); // delete a record.

Step 2:

Refresh the Tree Grid after the data source change by using the refresh method.

    treegrid.refresh(); // refresh the Grid.

Source

Preview

index.js

index.css

index.html

var treegrid = new ej.treegrid.TreeGrid({
    dataSource: projectData,
    idMapping: 'TaskID',
    parentIdMapping: 'parentID',
    treeColumnIndex: 1,
    columns: [
     { field: 'TaskID', headerText: 'Task ID', width: 70, textAlign: 'Right' },
     { field: 'TaskName', headerText: 'Task Name', width: 100, textAlign: 'Left' },
     { field: 'StartDate', headerText: 'Start Date', width: 90, textAlign: 'Right', type: 'date', format: 'yMd'},
     { field: 'EndDate', headerText: 'End Date', width: 90, textAlign: 'Right', type: 'date', format: 'yMd'},
     { field: 'Duration', headerText: 'Duration', width: 90, textAlign: 'Right' },
     { field: 'Priority', headerText: 'Priority', width: 90, textAlign: 'Right' }
    ],
});
treegrid.appendTo('#TreeGrid');

var add = new ej.buttons.Button({}, '#add');
var dele = new ej.buttons.Button({}, '#delete');

document.getElementById('add').onclick = () => {
    var data = { TaskID: 111, TaskName: "New Task", Duration: 40, StartDate: new Date(8367642e5), Priority: "High" };
    (treegrid.dataSource).unshift(data); // add new record.
    treegrid.refresh(); // refresh the TreeGrid.
};

document.getElementById('delete').onclick = () => {
    if (treegrid.getSelectedRowIndexes().length) {
        var selectedRow = treegrid.getSelectedRowIndexes()[0];
        (treegrid.dataSource).splice(selectedRow, 1); // delete the selected record.
    } else {
        alert("No records selected for delete operation");
    }
    treegrid.refresh(); // refresh the TreeGrid.
};

#container {
    visibility: hidden;
}

#loader {
  color: #008cff;
  font-family: 'Helvetica Neue','calibiri';
  font-size: 14px;
  height: 40px;
  left: 45%;
  position: absolute;
  top: 45%;
  width: 30%;
}

.disabletreegrid {
  pointer-events: none;
  opacity: 0.4;
}
.wrapper {
  cursor: not-allowed;
}

<!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/ej2/21.1.35/ej2-base/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-grids/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-treegrid/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-buttons/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-popups/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-navigations/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-dropdowns/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-lists/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-inputs/styles/material.css" rel="stylesheet">
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-calendars/styles/material.css" rel="stylesheet">
    
    
    
    <link href="//cdn.syncfusion.com/ej2/21.1.35/ej2-splitbuttons/styles/material.css" rel="stylesheet">
    
    
    
    
<script src="https://cdn.syncfusion.com/ej2/21.1.35/dist/ej2.min.js" type="text/javascript"></script>
<script src="es5-datasource.js" type="text/javascript"></script>
</head>
<body>
    
    <div id="container">
        <button class="e-flat" id="add">Add</button>
        <button class="e-flat" id="delete">Delete</button>
        <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>

You can refer to our JavaScript Tree Grid feature tour page for its groundbreaking feature representations. You can also explore our JavaScript Tree Grid example JavaScript Tree Grid example to knows how to present and manipulate data.