Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

Professional Opinions
Ask a Question
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

troubleshooting Question

how to caputre the file downloading event and stop the spining icon.

Avatar of Arthur Wang
Arthur WangFlag for United States of America asked on
JavaJavaScriptjQuery* cookie
14 Comments1 Solution136 ViewsLast Modified:
I am trying to capture the event of the file downloading such that the spinning loader can be stopped, however, I tried multiple ways, it's still not working yet. please see my code below:

<script type="text/javascript">
    $(":submit").click(function() {   	
* above block of code works, below block does not
        var fileDownloadCheckTimer;
        fileDownloadCheckTimer = window.setInterval(function(){
        var cookieValue = getCookie('fileDownloadToken');
        if(cookieValue == "fileIsReady") {

 * Get a cookie
 * @param {String} cname, cookie name
 * @return {String} String, cookie value 
function getCookie(cname) {
    var name = cname + "="; //Create the cookie name variable with cookie name concatenate with = sign
    var cArr = window.document.cookie.split(';'); //Create cookie array by split the cookie by ';'
    //Loop through the cookies and return the cooki value if it find the cookie name
    for(var i=0; i<cArr.length; i++) {
        var c = cArr[i].trim();
        //If the name is the cookie string at position 0, we found the cookie and return the cookie value
        if (c.indexOf(name) == 0) {
        	document.getElementById("demo").innerHTML = c.substring(name.length, c.length);;
            return c.substring(name.length, c.length);
    //If we get to this point, that means the cookie wasn't find in the look, we return an empty string.
    return "";
  * Delete a cookie
  * @param {String} cname, cookie name
 function deleteCookie(cname) {
     var d = new Date(); //Create an date object
     d.setTime(d.getTime() - (1000*60*60*24)); //Set the time to the past. 1000 milliseonds = 1 second
     var expires = "expires=" + d.toGMTString(); //Compose the expirartion date
     window.document.cookie = cname+"="+"; "+expires;//Set the cookie with name and the expiration date

function finishDownload(){

function hideConfirm() {
    var x = document.getElementById("loader");
    if (x.style.display == "block") {
        x.style.display = "none";


the servlet send out the cookie "fileIsReady" for the browser to capture:

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException

		response.setHeader("Content-disposition", "attachment;filename=" + filename);

		Cookie cookie = new Cookie("fileDownloadToken", "fileIsReady");
		log.info("file download cookie is: " + cookie);
		response.addCookie(cookie);//for download signals
		ServletOutputStream sos = response.getOutputStream();
		workbook = null;
		log.debug("Finished to output excel stream.");


My loader just keep running even though the file downloading has completed, which means the cookie---fileIsReady never been captured,  I carefully checked my source, nothing wrong, and the server does not report any error messages. can anybody help?
Avatar of leakim971
leakim971Flag of Guadeloupe imageMultitechnician
This problem has been solved!
Unlock 1 Answer and 14 Comments.
See Answers