Read an Excel File with JavaScript (without ActiveXObject)

< script type = "text/javascript" > function Upload() {
    var fileUpload = document.getElementById("fileUpload");
    var regex = /^([a-zA-Z0-9\s_\\.\-:])+(.csv|.txt)$/;
    if (regex.test(fileUpload.value.toLowerCase())) {
        if (typeof(FileReader) != "undefined") {
            var reader = new FileReader();
            reader.onload = function(e) {
                var table = document.createElement("table");
                var rows = e.target.result.split("\n");
                for (var i = 0; i < rows.length; i++) {
                    var row = table.insertRow(-1);
                    var cells = rows[i].split(",");
                    for (var j = 0; j < cells.length; j++) {
                        var cell = row.insertCell(-1);
                        cell.innerHTML = cells[j];
                    }
                }
                var dvCSV = document.getElementById("dvCSV");
                dvCSV.innerHTML = "";
                dvCSV.appendChild(table);
            }
            reader.readAsText(fileUpload.files[0]);
        } else {
            alert("This browser does not support HTML5.");
        }
    } else {
        alert("Please upload a valid CSV file.");
    }
} < /script>