Download Excel file in xlsx format using Javascript (exporting html tables into Excel)

Question

I am using JS, HTML and CSS to build my application and host it on a server. I am using the following code to import all the html tables to an excel file in xls format.

function fnExcelReport(tableNames) {
    var tab_text = "";
    var arrTableNames = tableNames.split("|");
    if (arrTableNames.length > 0) {
        for (var i = 0; i < arrTableNames.length; i++) {

                tab_text = tab_text + "<table border='1px'>";

            tab = document.getElementById(arrTableNames[i]); 


            for (j = 0; j < tab.children.length; j++) {
                tab_text = tab_text + tab.children[j].innerHTML;
            }
            tab_text = tab_text + "</table><br/><br/>";
            tab_text = tab_text.replace(/<A[^>]*>|<\/A>/g, ""); //remove if u want links in your table
            tab_text = tab_text.replace(/<img[^>]*>/gi, ""); // remove if u want images in your table
            tab_text = tab_text.replace(/<input[^>]*>|<\/input>/gi, ""); // reomves input params
        }
    }
    var ua = window.navigator.userAgent;
    var msie = ua.indexOf("MSIE ");

    if (msie > 0 || !!navigator.userAgent.match(/Trident.*rv\:11\./)) // If Internet Explorer
    {
        if (window.navigator.msSaveBlob) {
            var blob = new Blob([tab_text], {
                type: "data:application/vnd.ms-excel;"
            });
            sa = navigator.msSaveBlob(blob, "report.xls");
        }
    } else //other browser not tested on IE 11
        sa = window.open('data:application/vnd.ms-excel,' + encodeURIComponent(tab_text));

    return (sa);
}

I am able to download the file and open it, but I get the following warning message when I open it:

When I click yes, all my data is displayed correctly on the Excel file. I don't want to see that warning message. How do I change my code such that it opens with an xlsx format and removes the warning message?

Answer 1

This is because content is not of type "xls". i.e. if excel is of type "xlsx" you will get this error. Try with other excel extensions with file name.