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Show Spinner on Tree Grid when exporting in JavaScript (ES5) TreeGrid control

You can show/ hide spinner component while exporting the Tree Grid using showSpinner/ hideSpinner methods. You can use toolbarClick event to show spinner before exporting and hide a spinner in the pdfExportComplete or excelExportComplete event after the exporting.

In the toolbarClick event, based on the parameter args.item.text as PDF Export or Excel Export we can call the showSpinner method from Tree Grid instance.

In the pdfExportComplete or excelExportComplete event, We can call the hideSpinner method.

In the below demo, we have rendered the default spinner component when exporting the Tree Grid.

Source
Preview
index.js
index.css
index.html
ej.treegrid.TreeGrid.Inject(ej.treegrid.Page,ej.treegrid.Toolbar,ej.treegrid.PdfExport,ej.treegrid.ExcelExport);

var treegrid = new ej.treegrid.TreeGrid({
  dataSource: window.projectData,
  idMapping: "TaskID",
  parentIdMapping: "parentID",
  treeColumnIndex: 1,
  allowPaging: true,
  pageSettings: { pageSize: 5, pageCount: 5 },
  allowExcelExport: true,
  allowPdfExport: true,
  pdfExportComplete: pdfExportComplete,
  excelExportComplete: excelExportComplete,
  toolbar: ["PdfExport", "ExcelExport"],
  toolbarClick: toolbarClick,
  columns: [
    { field: "TaskID", headerText: "Task ID", textAlign: "Right", width: 70 },
    { field: "TaskName", headerText: "Task Name", width: 150 },
    { field: "StartDate", headerText: "Start Date", textAlign: "Right", width: 90,
      format: { skeleton: "yMd", type: "date" } },
    { field: "EndDate", headerText: "End Date", textAlign: "Right", width: 90,
      format: { skeleton: "yMd", type: "date" } },
    { field: "Duration", headerText: "Duration", textAlign: "Right", width: 80 },
    { field: "Priority", headerText: "Priority", width: 90 }
  ]
});
treegrid.appendTo("#TreeGrid");
function toolbarClick(args) {
  if (treegrid && args.item.text === "PDF Export") {
    treegrid.showSpinner();
    treegrid.pdfExport();
  } else if (treegrid && args.item.text === "Excel Export") {
    treegrid.showSpinner();
    treegrid.excelExport();
  }
}
function pdfExportComplete(args) {
  if (treegrid) {
    treegrid.hideSpinner();
  }
}
function excelExportComplete(args) {
  if (treegrid) {
    treegrid.hideSpinner();
  }
}
#container {
    visibility: hidden;
}

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