Read and write data to Excel using javascript..!

You can also check this code

<script type="text/javascript">
    function UploadProcess() {
        //Reference the FileUpload element.
        var fileUpload = document.getElementById("fileUpload");
 
        //Validate whether File is valid Excel file.
        var regex = /^([a-zA-Z0-9\s_\\.\-:])+(.xls|.xlsx)$/;
        if (regex.test(fileUpload.value.toLowerCase())) {
            if (typeof (FileReader) != "undefined") {
                var reader = new FileReader();
 
                //For Browsers other than IE.
                if (reader.readAsBinaryString) {
                    reader.onload = function (e) {
                        GetTableFromExcel(e.target.result);
                    };
                    reader.readAsBinaryString(fileUpload.files[0]);
                } else {
                    //For IE Browser.
                    reader.onload = function (e) {
                        var data = "";
                        var bytes = new Uint8Array(e.target.result);
                        for (var i = 0; i < bytes.byteLength; i++) {
                            data += String.fromCharCode(bytes[i]);
                        }
                        GetTableFromExcel(data);
                    };
                    reader.readAsArrayBuffer(fileUpload.files[0]);
                }
            } else {
                alert("This browser does not support HTML5.");
            }
        } else {
            alert("Please upload a valid Excel file.");
        }
    };
    function GetTableFromExcel(data) {
        //Read the Excel File data in binary
        var cfb = XLS.CFB.read(data, {type: 'binary'});
        var workbook = XLS.parse_xlscfb(cfb);
 
        //get the name of First Sheet.
        var Sheet = workbook.SheetNames[0];
 
        //Read all rows from First Sheet into an JSON array.
        var excelRows = XLS.utils.sheet_to_row_object_array(workbook.Sheets[Sheet]);
 
        //Create a HTML Table element.
        var myTable  = document.createElement("table");
        myTable.border = "1";
 
        //Add the header row.
        var row = myTable.insertRow(-1);
 
        //Add the header cells.
        var headerCell = document.createElement("TH");
        headerCell.innerHTML = "Id";
        row.appendChild(headerCell);
 
        headerCell = document.createElement("TH");
        headerCell.innerHTML = "Name";
        row.appendChild(headerCell);
 
        headerCell = document.createElement("TH");
        headerCell.innerHTML = "Country";
        row.appendChild(headerCell);
        
        headerCell = document.createElement("TH");
        headerCell.innerHTML = "Age";
        row.appendChild(headerCell);
        
        headerCell = document.createElement("TH");
        headerCell.innerHTML = "Date";
        row.appendChild(headerCell);
         
         headerCell = document.createElement("TH");
        headerCell.innerHTML = "Gender";
        row.appendChild(headerCell);
 
 
        //Add the data rows from Excel file.
        for (var i = 0; i < excelRows.length; i++) {
            //Add the data row.
            var row = myTable.insertRow(-1);
 
            //Add the data cells.
            var cell = row.insertCell(-1);
            cell.innerHTML = excelRows[i].Id;
 
            cell = row.insertCell(-1);
            cell.innerHTML = excelRows[i].Name;
 
            cell = row.insertCell(-1);
            cell.innerHTML = excelRows[i].Country;
            
            cell = row.insertCell(-1);
            cell.innerHTML = excelRows[i].Age;
            
            cell = row.insertCell(-1);
            cell.innerHTML = excelRows[i].Date;
            
            cell = row.insertCell(-1);
            cell.innerHTML = excelRows[i].Gender;
        }
        
 
        var ExcelTable = document.getElementById("ExcelTable");
        ExcelTable.innerHTML = "";
        ExcelTable.appendChild(myTable);
    };
</script>

Reference: https://qawithexperts.com/article/javascript/read-excel-file-using-javascript-xlsx-or-xls/2393

Hi Tom,

Thanks for your valuable reply.

Already I have use that CSV format, unfortunate I can read data but can't to update the data to CSV.

Please advice, which Mode is  favorable for simultaneously read and write data.

- yajiv

Code:

UpdateExcel();  
function UpdateExcel(){          
    var docRef=app.activeDocument;  
    var docPath=docRef.path;  
    var dname=docRef.name;  
          
    var f = docPath+"/Temp.csv";  
    var datafile = new File(f);  
    if (datafile.exists) {   
        datafile.open('r');  
        while (!datafile.eof){  
            strLineIn = datafile.readln();  
            colorArray = strLineIn.split(",");  
            if (colorArray[6]!=""){  
                if(colorArray[6].match(dname)!=null){  
                    colorArray[7].value=docPath;  
                    return;
                }  
            }  
        }  
    }  
}