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Passing additional parameters to the server when Exporting

You can pass the additional parameter in the query property by invoking addParams method. In the toolbarClick event, you can define params as key and value pair so it will receive at the server side when exporting.

In the below example, we have passed recordcount as 12 using addParams method.

Source
Preview
index.js
index.html
ej.grids.Grid.Inject(ej.grids.Page, ej.grids.PdfExport, ej.grids.ExcelExport, ej.grids.Toolbar);
var queryClone;
var grid = new ej.grids.Grid({
    dataSource: data,
    allowPaging: true,
    allowPdfExport: true,
    allowExcelExport: true,
    toolbar: ['PdfExport', 'ExcelExport'],
    columns: [
        { field: 'OrderID', headerText: 'Order ID', textAlign: 'Right', width: 120, type: 'number' },
        { field: 'CustomerID', width: 140, headerText: 'Customer ID', visible: false },
        { field: 'Freight', headerText: 'Freight', textAlign: 'Right', width: 120 },
        { field: 'ShipCity', headerText: 'ShipCity', textAlign: 'Right', width: 140 }
    ],
    height: 260
});
grid.appendTo('#Grid');
grid.toolbarClick = function(args){
    if (args['item'].id === 'Grid_pdfexport') {
        queryClone = grid.query;
        grid.query = new ej.data.Query().addParams("recordcount", "12");
        grid.pdfExport();
    }
    if (args['item'].id === 'Grid_excelexport') {
        queryClone = grid.query;
        grid.query = new ej.data.Query().addParams("recordcount", "12");
        grid.excelExport();
    }
}
grid.pdfExportComplete = () => {
        grid.query = queryClone;
    }
grid.excelExportComplete = () => {
        grid.query = queryClone;
    }
<!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-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-row[aria-selected="true"] .e-customizedExpandcell {
            background-color: #e0e0e0;
        }
        .e-grid.e-gridhover tr[role='row']:hover {
            background-color: #eee;
        }
        .e-expand::before {
        content: '\e5b8';
    }
    </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>
    
    <div id="container">
        <div id="Grid"></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>