Questions Identifying Between Refresh And Close Browser Actions

When we refresh the page (F5, or icon in browser), it will first trigger ONUNLOAD event. When we close the browser (X on right top icon),It will trigger ONUNLOAD event. Now when ONUNLOAD event is triggered, there is no way to distinguish between refresh the page or close the browser. If you have any solution then give me.

Comments :

Here is the answer how to detect page reloading via HTML5 api in MODERN browsers.(works for me):…

8 Answers :
w1zeman1p answered

There is a solution.

I wanted to disconnect the user on the server when the tab or browser window was closed, but not when the page was reloaded (you may want to differentiate reload/close events for a different purpose but you may benefit from my solution). I ended up with the following process, based on HTML5's local storage and client/server AJAX communication:

  1. on your page, add an onunload to the window to the following handler (pseudo-javascript):

    function myUnload(event) {
        if (window.localStorage) {
            // flag the page as being unloading
            window.localStorage['myUnloadEventFlag']=new Date().getTime();
        // notify the server that we want to disconnect the user in a few seconds (I used 5 seconds)
        askServerToDisconnectUserInAFewSeconds(); // synchronous AJAX call
  2. on your page, add a onloadon the body to the following handler (pseudo-javascript):

    function myLoad(event) {
        if (window.localStorage) {
            var t0 = Number(window.localStorage['myUnloadEventFlag']);
            if (isNaN(t0)) t0=0;
            var t1=new Date().getTime();
            var duration=t1-t0;
            if (duration<10*1000) {
                // less than 10 seconds since the previous Unload event => it's a browser reload (so cancel the disconnection request)
                askServerToCancelDisconnectionRequest(); // asynchronous AJAX call
            } else {
                // last unload event was for a tab/window close => do whatever you want (I do nothing here)
  3. on the server, collect the disconnection requests in a list and set a timer thread which inspects the list at regular intervals (I used every 20 seconds). Once a disconnection request timeout (i.e. the 5 seconds are gone), disconnect the user from the server. If a disconnection request cancelation is received in the meantime, the corresponding disconnection request is removed from the list, so that the user will not be disconnected.

This approach is also applicable if you want to differentiate between tab/window close event and followed links or submitted form . You just need to put the two event handlers on every page which contains links and forms and on every link/form landing page.

Note that I use the unload event instead of the beforeUnload event in order to manage links to attachments properly: when a user clicks on a link to an attachment (e.g. PDF file), the beforeUnload event is dispatched, then an open/save popup is raised, and nothing more (the browser does not change the displayed page and does not dispatch the unload event). If I were using the beforeUnload event (as I did before), I would have detected a page change when there is none.

This approach is limited to the browsers which support HTML5 local storage, so you would probably use specific approaches for old browsers such as MSIE7.

Other approaches based on the event.clientY are not reliable because this value is negative when clicking on the reload or tab/window close buttons, and positive when keyboard shortcuts are used to reload (e.g. F5, Ctrl-R, ...) and window closing (e.g. Alt-F4). Relying on the event X position is also not reliable because the buttons are not placed at the same position on every browser (e.g. close button at the left).

Useless Code replied
I'd use sessionStorage instead of localStorage since you are just tracking reloads there is no reason for it to persist.;
Rajab Shakirov replied
Here is the answer how to detect page reloading via HTML5 api in MODERN browsers.(works for me):…;
Walter Rumsby answered

Unfortunately inspecting the clientY/pageY value of the event, as suggested by some of the answers here, is not a reliable way to determine if the unload event is being fired by as a consequence of the user closing the page.

The reason clientY/pageY is negative when you click the browser's close button is because the close button is positioned above the top of the document (i.e. above pixel 0), but so is the reload button meaning that clicking the reload button will also result in a negative value for clientY/pageY.

Going down the path of inspecting the x co-ordinate of the event is also problematic because the browser close button is not always on the right hand side of the window (e.g. it's on the left in OS X) and because a window can be closed by closing its tab or via the keyboard.

krunal nanda answered

Use the window.onbeforeunload event for the case to navigate away from page, but it will include refreshing or anchor tags .... use a validation flag for the same, 1 example for the process is the URL check(Initial URL = current URL) or F5 check using keycode for refresh, In case of anchor tags use the bind()

Note* Keycode may cause problem in case of Chrome.

<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<title>Test Page</title>

<style type='text/css'>
body {
    font-family: sans-serif;
<script src="jquery-1.9.1.js" type='text/javascript'></script>
<script type='text/javascript'>
var valid=false;
function wireUpEvents() {

alert("Page Refreshed or Redirected");

window.onbeforeunload = askWhetherToClose;

function askWhetherToClose(event) {


    var msg;

    msg = "You're leaving the page, do you really want to?";
    event = event || window.event;
    event.returnValue = msg;
    return msg;
$(document).bind('keypress', function(e) { 
 if (e.keyCode == 116){ 

 // or you can insert some code to check page refresh
 valid = true; 

 $("a").bind("click", function() {
//To check redirection using Anchor tags  
 valid = true; 
$(document).ready(function() { 

<p>Close the browser window, or navigate to <a href="">StackOverflow</a></p>
SwR replied
This code not working when a user clicks browser refersh or back button..;
Suresh answered

I just tried this and it solved the issue: Create a sessionStorage object which will get destroyed when the user closes the browser. We can check the sessionStorage object to find if the user has closed the browser or refreshed the page(sessionStorage object will not be destroyed on page refresh).

This answer needs code example. In Chrome 56 sessionStorage.getItem() works normally in onunload listener when user closes a browser .;
Barry Bazini answered
    $(window).bind('unload', function () {
        if (/Firefox[\/\s](\d+)/.test(navigator.userAgent) && new Number(RegExp.$1) >= 4) {
            console.log('firefox delete');
            var data = { async: false };
            return null;
        else {
            console.log('NON-firefox delete');
            var data = { async: true };
            return null;

    function endSession(data) {
        var id = 0

        if (window) { // closeed

            url: '/api/commonAPI/'+id+'?Action=ForceEndSession',
            type: "get",
            data: {},
            async: data.async,
            success: function () {
                console.log('Forced End Session');

Use if (window) to determines if closed or just reload. working for me.

In Chrome 56 window object is defined in onunload listener when user closes a browser;
Alessandro answered

Today I had the same problem and found a possible solution that I want to share with you.

While thinking about what could help to discern between refresh and close, cookies came to my mind. I remember that setting a cookie without an explicit expiration date, renders it available only for the current session. And a current session is clearly valid until the browser is closed. This does not include closing a tab, but my problem was about user authentication and I didn't want to logout the user only for having closed a tab (I think that's the same approach as the ASPXAUTH cookie of ASP.NET).

So, I put a simple cookie in the document.cookies collection when user logged in and checked it on page load: if cookie was still there it was a refresh or a reopened tab and user data was kept, if cookie was not present session had expired so user data was cleared (same as an explicit logout).

Hope this approach can be useful to someone else!

Real Red. answered

My earlier solution worked for me in IE. window.event would be undefined for browsers other than IE as 'event' is globally defined in IE unlike in other browsers. You would need to supply event as a parameter in case of other browsers. Also that clientX is not defined for firefox, we should use pageX.

Try something like this....should work for IE and firefox this...

<script type="text/javascript">

window.onunload = function(e) {
// Firefox || IE
e = e || window.event;

var y = e.pageY || e.clientY;

if(y < 0)  alert("Window closed");
else alert("Window refreshed");

ashish bhatt replied
thanks Liv 1, I tried this code but it not work properly in Firefox,in this Problem occurs when Tab is closed and refresh button clicked. If you have any other solution then give me please..;
Real Red. replied
@renegadeMind, did it work for you?;
Walter Rumsby replied
This technique cannot be used to reliably determine if the browser window has been closed.;
웃웃웃웃웃 answered
<body onunload="doUnload()">
   function doUnload(){
     if (window.event.clientX < 0 && window.event.clientY < 0){
       alert("Window closed");
       alert("Window refreshed");
ashish bhatt replied
Is it work on all the browsers? please give me with the some comments.;
ashish bhatt replied
Thanks friend, But your code is not working FF browser, so Please suggest me another answer.;
Real Red. replied
please see the other answer. it should work for you. if it does work, please mark answer as correct so that others know.;