write data to excel sheet javascript code example

Example: javascript save table as excel

<button  type="button" id="export" onclick="exportTableToExcel('tblData')">Export List</button>

<script>
    function exportTableToExcel(tableID, filename = '') {
        var downloadLink;
        var dataType = 'application/vnd.ms-excel';
        var tableSelect = document.getElementById(tableID);
        var tableHTML = tableSelect.outerHTML.replace(/ /g, '%20');

        // Specify file name
        filename = filename ? filename + '.xls' : 'excel_data.xls';

        // Create download link element
        downloadLink = document.createElement("a");

        document.body.appendChild(downloadLink);

        if (navigator.msSaveOrOpenBlob) {
            var blob = new Blob(['\ufeff', tableHTML], {
                type: dataType
            });
            navigator.msSaveOrOpenBlob(blob, filename);
        } else {
            // Create a link to the file
            downloadLink.href = 'data:' + dataType + ', ' + tableHTML;
            // Setting the file name
            downloadLink.download = filename;

            //triggering the function
            downloadLink.click();
        }
    }
</script>