To get No.of Excel sheet records in textbox using javascript

I want to get excel file starting data and ending data on textboxes named "start_row" and "end_row"

to fetch all the records excel data I used javascript function given below :

function Upload() {

//Reference the FileUpload element.

var fileUpload = document.getElementById("ExcelFile");

//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();

debugger

//For Browsers other than IE.

if (reader.readAsBinaryString) {

reader.onload = function (e) {

FillRow(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]);

}

};

reader.readAsArrayBuffer(fileUpload.files[0]);

}

} else {

alert("This browser does not support HTML5.");

}

} else {

alert("Please upload a valid Excel file.");

}

};

function FillRow(data) {

debugger

var workbook = XLSX.read(data, {

type: 'binary'

});

var sel_val = document.getElementById("ddlSheetName").value;

var txt_start_row = document.getElementById("start_row");

var txt_end_row = document.getElementById("end_row");

var excelRows = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sel_val]);

}

In var excelRows there is array consists of all rows on workbook, as declared i want starting row no. on txt_start_row and ending row no. on txt_end_row

can anyone help!