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Is there any cross-browser JavaScript/jQuery code to detect if the browser or a browser tab is being closed, but not due to a link being clicked?
If I get you correctly, you want to know when a tab/window is effectively closed. Well, AFAIK the only way in JavaScript to detect that is to use either onunload or onbeforeunload events.
Unfortunately (or fortunately?), those events are also fired when you leave a site over a link or your browsers back button. So this is the best answer I can give, I don't think you can natively detect a pure close in JavaScript. Correct me if I'm wrong here.
From MDN Documentation
For some reasons, Webkit-based browsers don't follow the spec for the dialog box. An almost cross-working example would be close from the below example.
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = "\o/";
(e || window.event).returnValue = confirmationMessage; //Gecko + IE
return confirmationMessage; //Webkit, Safari, Chrome
});
This example for handling all browsers.
Simple Solution
window.onbeforeunload = function () {
return "Do you really want to close?";
};
<body onbeforeunload="ConfirmClose()" onunload="HandleOnClose()">
var myclose = false;
function ConfirmClose()
{
if (event.clientY < 0)
{
event.returnValue = 'You have closed the browser. Do you want to logout from your application?';
setTimeout('myclose=false',10);
myclose=true;
}
}
function HandleOnClose()
{
if (myclose==true)
{
//the url of your logout page which invalidate session on logout
location.replace('/contextpath/j_spring_security_logout') ;
}
}
//This is working in IE7, if you are closing tab or browser with only one tab
For similar tasks, you can use sessionStorage to store data locally until the browser tab is closed.
The sessionStorage object stores data for only one session (the data is deleted when the browser tab is closed).(W3Schools)
This is my pen.
<div id="Notice">
<span title="remove this until browser tab is closed"><u>dismiss</u>.</span>
</div>
<script>
$("#Notice").click(function() {
//set sessionStorage on click
sessionStorage.setItem("dismissNotice", "Hello");
$("#Notice").remove();
});
if (sessionStorage.getItem("dismissNotice"))
//When sessionStorage is set Do stuff...
$("#Notice").remove();
</script>
I needed to automatically log the user out when the browser or tab closes, but not when the user navigates to other links. I also did not want a confirmation prompt shown when that happens. After struggling with this for a while, especially with IE and Edge, here's what I ended doing (checked working with IE 11, Edge, Chrome, and Firefox) after basing off the approach by this answer.
First, start a countdown timer on the server in the beforeunload event handler in JS. The ajax calls need to be synchronous for IE and Edge to work properly. You also need to use return; to prevent the confirmation dialog from showing like this:
window.addEventListener("beforeunload", function (e) {
$.ajax({
type: "POST",
url: startTimerUrl,
async: false
});
return;
});
Starting the timer sets the cancelLogout flag to false. If the user refreshes the page or navigates to another internal link, the cancelLogout flag on the server is set to true. Once the timer event elapses, it checks the cancelLogout flag to see if the logout event has been cancelled. If the timer has been cancelled, then it would stop the timer. If the browser or tab was closed, then the cancelLogout flag would remain false and the event handler would log the user out.
Implementation note: I'm using ASP.NET MVC 5 and I'm cancelling logout in an overridden Controller.OnActionExecuted() method.
I found a way, that works on all of my browsers.
Tested on following versions:
Firefox 57, Internet Explorer 11, Edge 41, one of the latested Chrome (it won't show my version)
Note: onbeforeunload fires if you leave the page in any way possible (refresh, close browser, redirect, link, submit..). If you only want it to happen on browser close, simply bind the event handlers.
$(document).ready(function(){
var validNavigation = false;
// Attach the event keypress to exclude the F5 refresh (includes normal refresh)
$(document).bind('keypress', function(e) {
if (e.keyCode == 116){
validNavigation = true;
}
});
// Attach the event click for all links in the page
$("a").bind("click", function() {
validNavigation = true;
});
// Attach the event submit for all forms in the page
$("form").bind("submit", function() {
validNavigation = true;
});
// Attach the event click for all inputs in the page
$("input[type=submit]").bind("click", function() {
validNavigation = true;
});
window.onbeforeunload = function() {
if (!validNavigation) {
// -------> code comes here
}
};
});
There is no event, but there is a property window.closed which is supported in all major browsers as of the time of this writing. Thus if you really needed to know you could poll the window to check that property.
if(myWindow.closed){do things}
Note:
Polling anything is generally not the best solution. The window.onbeforeunload event should be used if possible, the only caveat being that it also fires if you navigate away.
Sorry, I was not able to add a comment to one of existing answers, but in case you wanted to implement a kind of warning dialog, I just wanted to mention that any event handler function has an argument - event. In your case you can call event.preventDefault() to disallow leaving the page automatically, then issue your own dialog. I consider this a way better option than using standard ugly and insecure alert(). I personally implemented my own set of dialog boxes based on kendoWindow object (Telerik's Kendo UI, which is almost fully open-sourced, except of kendoGrid and kendoEditor). You can also use dialog boxes from jQuery UI. Please note though, that such things are asynchronous, and you will need to bind a handler to onclick event of every button, but this is all quite easy to implement.
However, I do agree that the lack of the real close event is terrible: if you, for instance, want to reset your session state at the back-end only on case of the real close, it's a problem.
$(window).unload( function () { alert("Bye now!"); } );
onunload is the answer for Chrome. According to caniuse its crossbrowser. But not all browsers react the same.
window.onunload = function(){
alert("The window is closing now!");
}
developer.mozilla.org
These events fire when the window is unloading its content and resources.
For Chrome:
onunload executes only on page close. It doesn't execute even on page refresh and on navigating to a different page.
For Firefox v86.0:
It wouldn't execute at all. Page refresh, navigating away, closing browser tab, closing browser, nothing.
Since no one has mentioned it yet (8+ years later): A WebSocket can be another effective way to detect a closed tab. As long as the tab is open and pointed at the host, the client is able to maintain an active WebSocket connection to the host.
Caveat: Please note that this solution is really only viable for a project if a WebSocket doesn't require any additional significant overhead from what you are already doing.
Within a sensible timeout period (e.g. 2 minutes), the server side can determine that the client has gone away after the WebSocket has disconnected and perform whatever action is desired such as removing uploaded temp files. (In my extremely specialized use-case, my goal was to terminate a localhost app server three seconds after the WebSocket connection drops and all CGI/FastCGI activity terminates - any other keep-alive connections don't affect me.)
I had problems getting the onunload event handler to work properly with beacons (as recommended by this answer). Closing the tab did not appear to trigger the beacon and open tabs triggered it in ways that could potentially cause problems. A WebSocket solved the problem I was running into more cleanly because the connection closes roughly around the same time that the tab closes and switching pages within the application simply opens a new WebSocket connection well within the delay window.
It can be used to alert the user if some data is unsaved or something like that. This method works when the tab is closed or when the browser is closed, or webpage refresh.
It won't work unless the user has not interacted with the webpage, this is a mechanism to fight malicious websites..... there will be no popup unless you atleast make a click or touch on the website window.
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form>
<textarea placeholder = "Write...."></textarea>
</form>
<script type="text/javascript">
window.addEventListener('beforeunload', function (e) {
e.returnValue = '';
});
</script>
</body>
</html>
window.onbeforeunload = function() {
console.log('event');
return false; //here also can be string, that will be shown to the user
}
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = "tab close";
(e || window.event).returnValue = confirmationMessage; //Gecko + IE
sendkeylog(confirmationMessage);
return confirmationMessage; //Webkit, Safari, Chrome etc.
});
//Detect Browser or Tab Close Events
$(window).on('beforeunload',function(e) {
e = e || window.event;
var localStorageTime = localStorage.getItem('storagetime')
if(localStorageTime!=null && localStorageTime!=undefined){
var currentTime = new Date().getTime(),
timeDifference = currentTime - localStorageTime;
if(timeDifference<25){//Browser Closed
localStorage.removeItem('storagetime');
}else{//Browser Tab Closed
localStorage.setItem('storagetime',new Date().getTime());
}
}else{
localStorage.setItem('storagetime',new Date().getTime());
}
});
JSFiddle Link
Hi all, I was able to achieve 'Detect Browser and Tab Close Event' clicks by using browser local storage and timestamp. Hope all of you will get solved your problems by using this solution.
After my initial research i found that when we close a browser, the browser will close all the tabs one by one to completely close the browser. Hence, i observed that there will be very little time delay between closing the tabs. So I taken this time delay as my main validation point and able to achieve the browser and tab close event detection.
I tested it on Chrome Browser Version 76.0.3809.132 and found working
:) Vote Up if you found my answer helpful....
I have tried all above solutions, none of them really worked for me, specially because there are some Telerik components in my project which have 'Close' button for popup windows, and it calls 'beforeunload' event. Also, button selector does not work properly when you have Telerik grid in your page (I mean buttons inside the grid) So, I couldn't use any of above suggestions. Finally this is the solution worked for me.
I have added an onUnload event on the body tag of _Layout.cshtml. Something like this:
<body onUnload="LogOff()">
and then add the LogOff function to redirect to Account/LogOff which is a built-in method in Asp.Net MVC. Now, when I close the browser or tab, it redirect to LogOff method and user have to login when returns. I have tested it in both Chrome & Firefox. And it works!
function LogOff() {
$.ajax({
url: "/Account/LogOff",
success: function (result) {
}
});
}
window.onbeforeunload = function ()
{
if (isProcess > 0)
{
return true;
}
else
{
//do something
}
};
This function show a confirmation dialog box if you close window or refresh page during any process in browser.This function work in all browsers.You have to set isProcess var in your ajax process.
It is possible to check it with the help of window.closed in an event handler on 'unload' event like this, but timeout usage is required (so result cannot be guaranteed if smth delay or prevent window from closure):
Example of JSFiddle (Tested on lates Safari, FF, Chrome, Edge and IE11 )
var win = window.open('', '', 'width=200,height=50,left=200,top=50');
win.document.write(`<html>
<head><title>CHILD WINDOW/TAB</title></head>
<body><h2>CHILD WINDOW/TAB</h2></body>
</html>`);
win.addEventListener('load',() => {
document.querySelector('.status').innerHTML += '<p>Child was loaded!</p>';
});
win.addEventListener('unload',() => {
document.querySelector('.status').innerHTML += '<p>Child was unloaded!</p>';
setTimeout(()=>{
document.querySelector('.status').innerHTML += getChildWindowStatus();
},1000);
});
win.document.close()
document.querySelector('.check-child-window').onclick = ()=> {
alert(getChildWindowStatus());
}
function getChildWindowStatus() {
if (win.closed) {
return 'Child window has been closed!';
} else {
return 'Child window has not been closed!';
}
}
There have been updates to the browser to better tack the user when leaving the app. The event 'visibilitychange' lets you tack when a page is being hidden from another tab or being closed. You can track the document visibility state. The property document.visibilityState will return the current state. You will need to track the sign in and out but its closer to the goal.
This is supported by more newer browser but safari (as we know) never conforms to standards. You can use 'pageshow' and 'pagehide' to work in safari.
You can even use new API's like sendBeacon to send a one way request to the server when the tab is being closed and shouldn't expect a response.
I build a quick port of a class I use to track this. I had to remove some calls in the framework so it might be buggy however this should get you started.
export class UserLoginStatus
{
/**
* This will add the events and sign the user in.
*/
constructor()
{
this.addEvents();
this.signIn();
}
/**
* This will check if the browser is safari.
*
* #returns {bool}
*/
isSafari()
{
if(navigator && /Safari/.test(navigator.userAgent) && /Chrome/.test(navigator.userAgent))
{
return (/Google Inc/.test(navigator.vendor) === false);
}
return false;
}
/**
* This will setup the events array by browser.
*
* #returns {array}
*/
setupEvents()
{
let events = [
['visibilitychange', document, () =>
{
if (document.visibilityState === 'visible')
{
this.signIn();
return;
}
this.signOut();
}]
];
// we need to setup events for safari
if(this.isSafari())
{
events.push(['pageshow', window, (e) =>
{
if(e.persisted === false)
{
this.signIn();
}
}]);
events.push(['pagehide', window, (e) =>
{
if(e.persisted === false)
{
this.signOut();
}
}]);
}
return events;
}
/**
* This will add the events.
*/
addEvents()
{
let events = this.setupEvents();
if(!events || events.length < 1)
{
return;
}
for(var i = 0, length = events.length; i < length; i++)
{
var event = events[i];
if(!event)
{
continue;
}
event[1].addEventListener(event[0], event[3]);
}
}
/**
*
* #param {string} url
* #param {string} params
*/
async fetch(url, params)
{
await fetch(url,
{
method: 'POST',
body: JSON.stringify(params)
});
}
/**
* This will sign in the user.
*/
signIn()
{
// user is the app
const url = '/auth/login';
let params = 'userId=' + data.userId;
this.fetch(url, params);
}
/**
* This will sign out the user.
*/
signOut()
{
// user is leaving the app
const url = '/auth/logout';
let params = 'userId=' + data.userId;
if(!('sendBeacon' in window.navigator))
{
// normal ajax request here
this.fetch(url, params);
return;
}
// use a beacon for a more modern request the does not return a response
navigator.sendBeacon(url, new URLSearchParams(params));
}
}
My approach would be along these lines:
Listen for changes in the url with onpopstate and set a sessionStorage variable with 1
Listen for page load and set that sessionStorage variable to 0
On beforeunload, check if the variable is 0. If so it means that the user is closing and not changing url.
This is still a roundabout way to go, but makes sense to me
As #jAndy mentioned, there is no properly javascript code to detect a window being closed.
I started from what #Syno had proposed.
I had pass though a situation like that and provided you follow these steps, you'll be able to detect it.
I tested it on Chrome 67+ and Firefox 61+.
var wrapper = function () { //ignore this
var closing_window = false;
$(window).on('focus', function () {
closing_window = false;
//if the user interacts with the window, then the window is not being
//closed
});
$(window).on('blur', function () {
closing_window = true;
if (!document.hidden) { //when the window is being minimized
closing_window = false;
}
$(window).on('resize', function (e) { //when the window is being maximized
closing_window = false;
});
$(window).off('resize'); //avoid multiple listening
});
$('html').on('mouseleave', function () {
closing_window = true;
//if the user is leaving html, we have more reasons to believe that he's
//leaving or thinking about closing the window
});
$('html').on('mouseenter', function () {
closing_window = false;
//if the user's mouse its on the page, it means you don't need to logout
//them, didn't it?
});
$(document).on('keydown', function (e) {
if (e.keyCode == 91 || e.keyCode == 18) {
closing_window = false; //shortcuts for ALT+TAB and Window key
}
if (e.keyCode == 116 || (e.ctrlKey && e.keyCode == 82)) {
closing_window = false; //shortcuts for F5 and CTRL+F5 and CTRL+R
}
});
// Prevent logout when clicking in a hiperlink
$(document).on("click", "a", function () {
closing_window = false;
});
// Prevent logout when clicking in a button (if these buttons rediret to some page)
$(document).on("click", "button", function () {
closing_window = false;
});
// Prevent logout when submiting
$(document).on("submit", "form", function () {
closing_window = false;
});
// Prevent logout when submiting
$(document).on("click", "input[type=submit]", function () {
closing_window = false;
});
var toDoWhenClosing = function() {
//write a code here likes a user logout, example:
//$.ajax({
// url: '/MyController/MyLogOutAction',
// async: false,
// data: {
// },
// error: function () {
// },
// success: function (data) {
// },
//});
};
window.onbeforeunload = function () {
if (closing_window) {
toDoWhenClosing();
}
};
};
try this,
I am sure this will work for you.
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type='text/javascript'>
$(function() {
try{
opera.setOverrideHistoryNavigationMode('compatible');
history.navigationMode = 'compatible';
}catch(e){}
function ReturnMessage()
{
return "wait";
}
function UnBindWindow()
{
$(window).unbind('beforeunload', ReturnMessage);
}
$(window).bind('beforeunload',ReturnMessage );
});
</script>
Try this. It will work. jquery unload method is depreceted.
window.onbeforeunload = function(event) {
event.returnValue = "Write something clever here..";
};
I'm trying to create an "Add To Home Screen" button on my progressive web app, as described in Chrome's documentation.
I'm generally following the prescribed pattern, where I have some hidden button which is displayed when Chrome's beforeinstallprompt event fires.
I capture the event once it fires, and then use the event to begin the native install dialogue once my own install button is clicked. The sample code is below:
let deferredPrompt;
window.addEventListener('beforeinstallprompt', (e) => {
// Prevent Chrome 67 and earlier from automatically showing the prompt
e.preventDefault();
// Stash the event so it can be triggered later.
deferredPrompt = e;
// Update UI notify the user they can add to home screen
btnAdd.style.display = 'block';
});
btnAdd.addEventListener('click', (e) => {
// hide our user interface that shows our A2HS button
btnAdd.style.display = 'none';
// Show the prompt
deferredPrompt.prompt();
// Wait for the user to respond to the prompt
deferredPrompt.userChoice
.then((choiceResult) => {
if (choiceResult.outcome === 'accepted') {
console.log('User accepted the A2HS prompt');
} else {
console.log('User dismissed the A2HS prompt');
}
deferredPrompt = null;
});
});
The issue I'm running into is that I don't want to show my install button (btnAdd) if the user has already installed the web app to thier home screen, and I'm having trouble figuring out how to check for that scenario.
I was hoping to modify the above code as follows:
window.addEventListener('beforeinstallprompt', (e) => {
// Prevent Chrome 67 and earlier from automatically showing the prompt
e.preventDefault();
// Stash the event so it can be triggered later.
deferredPrompt = e;
// If the user has not already installed...
deferredPrompt.userChoice
.then(choiceResult => {
if (choiceResult === undefined) {
// Update UI notify the user they can add to home screen
btnAdd.style.display = 'block';
}
});
});
So that the install button won't be displayed if the user has already installed. But this doesn't seem to work. It appears that if they haven't made a choice already, accessing userChoice just prompts the user directly with the native dialogue.
I'm not really sure how the beforeinstallevent works, so this might not even be a good strategy. Ideally I was hoping this would work something like something like navigator.serviceWorker.ready(), which returns a Promise rather than using browser events to try and figure out when stuff is ready.
In any case, are there any ideas on how I can check that the user has installed to home screen before I show my own home screen install button?
Edit: As Mathias has commented, checking for the event before showing the button should be sufficient. I believe the issue I was having is a result of using localhost, which appears to continually fire the beforeinstallprompt event even after installation, which is not the intended behavior. Hosting the code solved the issue.
Perhaps, don't show the button until you intercept the automatic pop-up?
or
In your code, check to see if the window is standalone
If it is, you need not show the button
if (window.matchMedia('(display-mode: standalone)').matches) {
// do things here
// set a variable to be used when calling something
// e.g. call Google Analytics to track standalone use
}
My example tester here
https://a2hs.glitch.me
Source code for my tester
https://github.com/ng-chicago/AddToHomeScreen
To answer original question. With latest versions of Chrome you can use window.navigator.getInstalledRelatedApps(). It returns a promise with an array of installed apps that your web app specifies as related in the manifest.json. To enable this to work you need to add related_applications field to manifest.json
"related_applications": [{
"platform": "webapp",
"url": "https://app.example.com/manifest.json"
}]
And then you can use it like:
//check if browser version supports the api
if ('getInstalledRelatedApps' in window.navigator) {
const relatedApps = await navigator.getInstalledRelatedApps();
relatedApps.forEach((app) => {
//if your PWA exists in the array it is installed
console.log(app.platform, app.url);
});
}
Source: API docs
Now you can display some elements depending if your app is installed. E.g: you can display "Open app" button and redirect user to PWA. But remember to disable it when the user is already in the app using #Mathias's answer and checking (display-mode: standalone)
However, regarding your use case. You should display install button only when beforeinstallprompt is intercepted. Browser does not fire this event if the PWA is already installed on the device. And when prompt is fired and choiceResult.outcome === 'accepted' you hide the button again.
I don't see how this is the correct answer, because this is basically a check if user uses the App already, but the behavior we wan't is "When the user is on the web and tries to install the app again to tell him that he already has the app in his device". Upon me this is not an answer that solves this.
What we can do is:
1. When the user clicks install but has the application on his device
In this case the beforeinstallprompt event WON'T BE fired so this event will return null. We store the result in global variable and when the result is null we show this to user that he already has the app installed.
2. When the user clicks install but doesn't have the application on his device
In this case the beforeinstallprompt event WILL be fired so this event will return access to show the prompt.
We can store the result in global variable and if it is not NULL (which won't be) because beforeinstallprompt will be fired if the user don't have the app on his device we show the prompt() to the user.
I doubt if mine solution is good too but I think that the Question and the correct answer don't have nothing in common
window.addEventListener("beforeinstallprompt", event => {
window.deferedPrompt = event;
});
handleButtonClick = () => {
const promptEvent = window.deferedPrompt;
if(!promptEvent){
// DO SOMETHING
}
//Show the add to home screen prompt
promptEvent.prompt()
promptEvent.userChoice.then((result: any) => {
// Reset the deferred prompt variable, since
// prompt() can only be called once.
window.deferedPrompt = null;.
});
}
<button onClick={handleButtonClick}>Install</button>
Here is the simple function that tells you, this app is open in browser or in pwa.
original source link
function getPWADisplayMode() {
const isStandalone = window.matchMedia('(display-mode: standalone)').matches;
if (document.referrer.startsWith('android-app://')) {
return 'twa';
} else if (navigator.standalone || isStandalone) {
return 'standalone';
}
return 'browser';
}
HTML
<!-- start with hidden button -->
<button id="install" style="display:none;">install</button>
JAVASCRIPT
// variable store event
window.deferredPrompt = {};
// get button with id
const install_button = document.querySelector('#install');
// if the app can be installed emit beforeinstallprompt
window.addEventListener('beforeinstallprompt', e => {
// this event does not fire if the application is already installed
// then your button still hidden ;)
// show button with display:block;
install_button.style.display = 'block';
// prevent default event
e.preventDefault();
// store install avaliable event
window.deferredPrompt = e;
// wait for click install button by user
install_button.addEventListener('click', e => {
window.deferredPrompt.prompt();
window.deferredPrompt.userChoice.then(choiceResult => {
if (choiceResult.outcome === 'accepted') {
// user accept the prompt
// lets hidden button
install_button.style.display = 'none';
} else {
console.log('User dismissed the prompt');
}
window.deferredPrompt = null;
});
});
});
// if are standalone android OR safari
if (window.matchMedia('(display-mode: standalone)').matches || window.navigator.standalone === true) {
// hidden the button
install_button.style.display = 'none';
}
// do action when finished install
window.addEventListener('appinstalled', e => {
console.log("success app install!");
});
Another way I've found to do this is to use IndexedDB. I import "idb-keyval" (https://www.npmjs.com/package/idb-keyval) to make it simple to get/set to the IndexedDb. Then I store a value that gets checked on the next page load. One difference with this method, is that it will let you check if your application is installed already if you visit the application webpage from the browser instead of the installed app shortcut.
import * as IDB from "idb-keyval";
let deferredPropt;
// Get the stored value from the IndexedDb
IDB.get("isInstalled").then((val) => {
if (val) {
// If it exists, run code based on an installed pwa
} else {
log({ isInstalled: false });
}
});
window.addEventListener("beforeinstallprompt", (e) => {
e.preventDefault();
deferredPrompt = e;
document.getElementById("installApp").addEventListener("click", async () => {
deferredPrompt.prompt();
const { outcome } = await deferredPrompt.userChoice;
if (outcome == "accepted") {
// Set the value into the IndexedDb on installation of the PWA
IDB.set("isInstalled", true);
}
});
});
I'm trying to re-start the Server sent events after i have stopped it on a button click.
So I stop the event like so:
if(typeof(EventSource)!=="undefined") {
//create an object, passing it the name and location of the server side script
var eSource = new EventSource("mypage.php");
//detect message receipt
eSource.onmessage = function(event) {
//write the received data to the page
document.getElementById("serverData").innerHTML = event.data;
if(event.data !=""){
alert('success');
///Close it here///////////
event.target.close();
}
};
}
else {
document.getElementById("serverData").innerHTML="Whoops! Your browser doesn't receive server-sent events.";
}
Now I need to restart the same SSE like so (if possible at all):
$('#someBtn').click(function(){
//////this is actually my assumption and there is no such a function///
event.target.start();
});
Could someone please advise on this?
Any help would be appreciated.
Is there any cross-browser JavaScript/jQuery code to detect if the browser or a browser tab is being closed, but not due to a link being clicked?
If I get you correctly, you want to know when a tab/window is effectively closed. Well, AFAIK the only way in JavaScript to detect that is to use either onunload or onbeforeunload events.
Unfortunately (or fortunately?), those events are also fired when you leave a site over a link or your browsers back button. So this is the best answer I can give, I don't think you can natively detect a pure close in JavaScript. Correct me if I'm wrong here.
From MDN Documentation
For some reasons, Webkit-based browsers don't follow the spec for the dialog box. An almost cross-working example would be close from the below example.
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = "\o/";
(e || window.event).returnValue = confirmationMessage; //Gecko + IE
return confirmationMessage; //Webkit, Safari, Chrome
});
This example for handling all browsers.
Simple Solution
window.onbeforeunload = function () {
return "Do you really want to close?";
};
<body onbeforeunload="ConfirmClose()" onunload="HandleOnClose()">
var myclose = false;
function ConfirmClose()
{
if (event.clientY < 0)
{
event.returnValue = 'You have closed the browser. Do you want to logout from your application?';
setTimeout('myclose=false',10);
myclose=true;
}
}
function HandleOnClose()
{
if (myclose==true)
{
//the url of your logout page which invalidate session on logout
location.replace('/contextpath/j_spring_security_logout') ;
}
}
//This is working in IE7, if you are closing tab or browser with only one tab
For similar tasks, you can use sessionStorage to store data locally until the browser tab is closed.
The sessionStorage object stores data for only one session (the data is deleted when the browser tab is closed).(W3Schools)
This is my pen.
<div id="Notice">
<span title="remove this until browser tab is closed"><u>dismiss</u>.</span>
</div>
<script>
$("#Notice").click(function() {
//set sessionStorage on click
sessionStorage.setItem("dismissNotice", "Hello");
$("#Notice").remove();
});
if (sessionStorage.getItem("dismissNotice"))
//When sessionStorage is set Do stuff...
$("#Notice").remove();
</script>
I needed to automatically log the user out when the browser or tab closes, but not when the user navigates to other links. I also did not want a confirmation prompt shown when that happens. After struggling with this for a while, especially with IE and Edge, here's what I ended doing (checked working with IE 11, Edge, Chrome, and Firefox) after basing off the approach by this answer.
First, start a countdown timer on the server in the beforeunload event handler in JS. The ajax calls need to be synchronous for IE and Edge to work properly. You also need to use return; to prevent the confirmation dialog from showing like this:
window.addEventListener("beforeunload", function (e) {
$.ajax({
type: "POST",
url: startTimerUrl,
async: false
});
return;
});
Starting the timer sets the cancelLogout flag to false. If the user refreshes the page or navigates to another internal link, the cancelLogout flag on the server is set to true. Once the timer event elapses, it checks the cancelLogout flag to see if the logout event has been cancelled. If the timer has been cancelled, then it would stop the timer. If the browser or tab was closed, then the cancelLogout flag would remain false and the event handler would log the user out.
Implementation note: I'm using ASP.NET MVC 5 and I'm cancelling logout in an overridden Controller.OnActionExecuted() method.
I found a way, that works on all of my browsers.
Tested on following versions:
Firefox 57, Internet Explorer 11, Edge 41, one of the latested Chrome (it won't show my version)
Note: onbeforeunload fires if you leave the page in any way possible (refresh, close browser, redirect, link, submit..). If you only want it to happen on browser close, simply bind the event handlers.
$(document).ready(function(){
var validNavigation = false;
// Attach the event keypress to exclude the F5 refresh (includes normal refresh)
$(document).bind('keypress', function(e) {
if (e.keyCode == 116){
validNavigation = true;
}
});
// Attach the event click for all links in the page
$("a").bind("click", function() {
validNavigation = true;
});
// Attach the event submit for all forms in the page
$("form").bind("submit", function() {
validNavigation = true;
});
// Attach the event click for all inputs in the page
$("input[type=submit]").bind("click", function() {
validNavigation = true;
});
window.onbeforeunload = function() {
if (!validNavigation) {
// -------> code comes here
}
};
});
There is no event, but there is a property window.closed which is supported in all major browsers as of the time of this writing. Thus if you really needed to know you could poll the window to check that property.
if(myWindow.closed){do things}
Note:
Polling anything is generally not the best solution. The window.onbeforeunload event should be used if possible, the only caveat being that it also fires if you navigate away.
Sorry, I was not able to add a comment to one of existing answers, but in case you wanted to implement a kind of warning dialog, I just wanted to mention that any event handler function has an argument - event. In your case you can call event.preventDefault() to disallow leaving the page automatically, then issue your own dialog. I consider this a way better option than using standard ugly and insecure alert(). I personally implemented my own set of dialog boxes based on kendoWindow object (Telerik's Kendo UI, which is almost fully open-sourced, except of kendoGrid and kendoEditor). You can also use dialog boxes from jQuery UI. Please note though, that such things are asynchronous, and you will need to bind a handler to onclick event of every button, but this is all quite easy to implement.
However, I do agree that the lack of the real close event is terrible: if you, for instance, want to reset your session state at the back-end only on case of the real close, it's a problem.
$(window).unload( function () { alert("Bye now!"); } );
onunload is the answer for Chrome. According to caniuse its crossbrowser. But not all browsers react the same.
window.onunload = function(){
alert("The window is closing now!");
}
developer.mozilla.org
These events fire when the window is unloading its content and resources.
For Chrome:
onunload executes only on page close. It doesn't execute even on page refresh and on navigating to a different page.
For Firefox v86.0:
It wouldn't execute at all. Page refresh, navigating away, closing browser tab, closing browser, nothing.
Since no one has mentioned it yet (8+ years later): A WebSocket can be another effective way to detect a closed tab. As long as the tab is open and pointed at the host, the client is able to maintain an active WebSocket connection to the host.
Caveat: Please note that this solution is really only viable for a project if a WebSocket doesn't require any additional significant overhead from what you are already doing.
Within a sensible timeout period (e.g. 2 minutes), the server side can determine that the client has gone away after the WebSocket has disconnected and perform whatever action is desired such as removing uploaded temp files. (In my extremely specialized use-case, my goal was to terminate a localhost app server three seconds after the WebSocket connection drops and all CGI/FastCGI activity terminates - any other keep-alive connections don't affect me.)
I had problems getting the onunload event handler to work properly with beacons (as recommended by this answer). Closing the tab did not appear to trigger the beacon and open tabs triggered it in ways that could potentially cause problems. A WebSocket solved the problem I was running into more cleanly because the connection closes roughly around the same time that the tab closes and switching pages within the application simply opens a new WebSocket connection well within the delay window.
It can be used to alert the user if some data is unsaved or something like that. This method works when the tab is closed or when the browser is closed, or webpage refresh.
It won't work unless the user has not interacted with the webpage, this is a mechanism to fight malicious websites..... there will be no popup unless you atleast make a click or touch on the website window.
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<form>
<textarea placeholder = "Write...."></textarea>
</form>
<script type="text/javascript">
window.addEventListener('beforeunload', function (e) {
e.returnValue = '';
});
</script>
</body>
</html>
window.onbeforeunload = function() {
console.log('event');
return false; //here also can be string, that will be shown to the user
}
window.addEventListener("beforeunload", function (e) {
var confirmationMessage = "tab close";
(e || window.event).returnValue = confirmationMessage; //Gecko + IE
sendkeylog(confirmationMessage);
return confirmationMessage; //Webkit, Safari, Chrome etc.
});
//Detect Browser or Tab Close Events
$(window).on('beforeunload',function(e) {
e = e || window.event;
var localStorageTime = localStorage.getItem('storagetime')
if(localStorageTime!=null && localStorageTime!=undefined){
var currentTime = new Date().getTime(),
timeDifference = currentTime - localStorageTime;
if(timeDifference<25){//Browser Closed
localStorage.removeItem('storagetime');
}else{//Browser Tab Closed
localStorage.setItem('storagetime',new Date().getTime());
}
}else{
localStorage.setItem('storagetime',new Date().getTime());
}
});
JSFiddle Link
Hi all, I was able to achieve 'Detect Browser and Tab Close Event' clicks by using browser local storage and timestamp. Hope all of you will get solved your problems by using this solution.
After my initial research i found that when we close a browser, the browser will close all the tabs one by one to completely close the browser. Hence, i observed that there will be very little time delay between closing the tabs. So I taken this time delay as my main validation point and able to achieve the browser and tab close event detection.
I tested it on Chrome Browser Version 76.0.3809.132 and found working
:) Vote Up if you found my answer helpful....
I have tried all above solutions, none of them really worked for me, specially because there are some Telerik components in my project which have 'Close' button for popup windows, and it calls 'beforeunload' event. Also, button selector does not work properly when you have Telerik grid in your page (I mean buttons inside the grid) So, I couldn't use any of above suggestions. Finally this is the solution worked for me.
I have added an onUnload event on the body tag of _Layout.cshtml. Something like this:
<body onUnload="LogOff()">
and then add the LogOff function to redirect to Account/LogOff which is a built-in method in Asp.Net MVC. Now, when I close the browser or tab, it redirect to LogOff method and user have to login when returns. I have tested it in both Chrome & Firefox. And it works!
function LogOff() {
$.ajax({
url: "/Account/LogOff",
success: function (result) {
}
});
}
window.onbeforeunload = function ()
{
if (isProcess > 0)
{
return true;
}
else
{
//do something
}
};
This function show a confirmation dialog box if you close window or refresh page during any process in browser.This function work in all browsers.You have to set isProcess var in your ajax process.
It is possible to check it with the help of window.closed in an event handler on 'unload' event like this, but timeout usage is required (so result cannot be guaranteed if smth delay or prevent window from closure):
Example of JSFiddle (Tested on lates Safari, FF, Chrome, Edge and IE11 )
var win = window.open('', '', 'width=200,height=50,left=200,top=50');
win.document.write(`<html>
<head><title>CHILD WINDOW/TAB</title></head>
<body><h2>CHILD WINDOW/TAB</h2></body>
</html>`);
win.addEventListener('load',() => {
document.querySelector('.status').innerHTML += '<p>Child was loaded!</p>';
});
win.addEventListener('unload',() => {
document.querySelector('.status').innerHTML += '<p>Child was unloaded!</p>';
setTimeout(()=>{
document.querySelector('.status').innerHTML += getChildWindowStatus();
},1000);
});
win.document.close()
document.querySelector('.check-child-window').onclick = ()=> {
alert(getChildWindowStatus());
}
function getChildWindowStatus() {
if (win.closed) {
return 'Child window has been closed!';
} else {
return 'Child window has not been closed!';
}
}
There have been updates to the browser to better tack the user when leaving the app. The event 'visibilitychange' lets you tack when a page is being hidden from another tab or being closed. You can track the document visibility state. The property document.visibilityState will return the current state. You will need to track the sign in and out but its closer to the goal.
This is supported by more newer browser but safari (as we know) never conforms to standards. You can use 'pageshow' and 'pagehide' to work in safari.
You can even use new API's like sendBeacon to send a one way request to the server when the tab is being closed and shouldn't expect a response.
I build a quick port of a class I use to track this. I had to remove some calls in the framework so it might be buggy however this should get you started.
export class UserLoginStatus
{
/**
* This will add the events and sign the user in.
*/
constructor()
{
this.addEvents();
this.signIn();
}
/**
* This will check if the browser is safari.
*
* #returns {bool}
*/
isSafari()
{
if(navigator && /Safari/.test(navigator.userAgent) && /Chrome/.test(navigator.userAgent))
{
return (/Google Inc/.test(navigator.vendor) === false);
}
return false;
}
/**
* This will setup the events array by browser.
*
* #returns {array}
*/
setupEvents()
{
let events = [
['visibilitychange', document, () =>
{
if (document.visibilityState === 'visible')
{
this.signIn();
return;
}
this.signOut();
}]
];
// we need to setup events for safari
if(this.isSafari())
{
events.push(['pageshow', window, (e) =>
{
if(e.persisted === false)
{
this.signIn();
}
}]);
events.push(['pagehide', window, (e) =>
{
if(e.persisted === false)
{
this.signOut();
}
}]);
}
return events;
}
/**
* This will add the events.
*/
addEvents()
{
let events = this.setupEvents();
if(!events || events.length < 1)
{
return;
}
for(var i = 0, length = events.length; i < length; i++)
{
var event = events[i];
if(!event)
{
continue;
}
event[1].addEventListener(event[0], event[3]);
}
}
/**
*
* #param {string} url
* #param {string} params
*/
async fetch(url, params)
{
await fetch(url,
{
method: 'POST',
body: JSON.stringify(params)
});
}
/**
* This will sign in the user.
*/
signIn()
{
// user is the app
const url = '/auth/login';
let params = 'userId=' + data.userId;
this.fetch(url, params);
}
/**
* This will sign out the user.
*/
signOut()
{
// user is leaving the app
const url = '/auth/logout';
let params = 'userId=' + data.userId;
if(!('sendBeacon' in window.navigator))
{
// normal ajax request here
this.fetch(url, params);
return;
}
// use a beacon for a more modern request the does not return a response
navigator.sendBeacon(url, new URLSearchParams(params));
}
}
My approach would be along these lines:
Listen for changes in the url with onpopstate and set a sessionStorage variable with 1
Listen for page load and set that sessionStorage variable to 0
On beforeunload, check if the variable is 0. If so it means that the user is closing and not changing url.
This is still a roundabout way to go, but makes sense to me
As #jAndy mentioned, there is no properly javascript code to detect a window being closed.
I started from what #Syno had proposed.
I had pass though a situation like that and provided you follow these steps, you'll be able to detect it.
I tested it on Chrome 67+ and Firefox 61+.
var wrapper = function () { //ignore this
var closing_window = false;
$(window).on('focus', function () {
closing_window = false;
//if the user interacts with the window, then the window is not being
//closed
});
$(window).on('blur', function () {
closing_window = true;
if (!document.hidden) { //when the window is being minimized
closing_window = false;
}
$(window).on('resize', function (e) { //when the window is being maximized
closing_window = false;
});
$(window).off('resize'); //avoid multiple listening
});
$('html').on('mouseleave', function () {
closing_window = true;
//if the user is leaving html, we have more reasons to believe that he's
//leaving or thinking about closing the window
});
$('html').on('mouseenter', function () {
closing_window = false;
//if the user's mouse its on the page, it means you don't need to logout
//them, didn't it?
});
$(document).on('keydown', function (e) {
if (e.keyCode == 91 || e.keyCode == 18) {
closing_window = false; //shortcuts for ALT+TAB and Window key
}
if (e.keyCode == 116 || (e.ctrlKey && e.keyCode == 82)) {
closing_window = false; //shortcuts for F5 and CTRL+F5 and CTRL+R
}
});
// Prevent logout when clicking in a hiperlink
$(document).on("click", "a", function () {
closing_window = false;
});
// Prevent logout when clicking in a button (if these buttons rediret to some page)
$(document).on("click", "button", function () {
closing_window = false;
});
// Prevent logout when submiting
$(document).on("submit", "form", function () {
closing_window = false;
});
// Prevent logout when submiting
$(document).on("click", "input[type=submit]", function () {
closing_window = false;
});
var toDoWhenClosing = function() {
//write a code here likes a user logout, example:
//$.ajax({
// url: '/MyController/MyLogOutAction',
// async: false,
// data: {
// },
// error: function () {
// },
// success: function (data) {
// },
//});
};
window.onbeforeunload = function () {
if (closing_window) {
toDoWhenClosing();
}
};
};
try this,
I am sure this will work for you.
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type='text/javascript'>
$(function() {
try{
opera.setOverrideHistoryNavigationMode('compatible');
history.navigationMode = 'compatible';
}catch(e){}
function ReturnMessage()
{
return "wait";
}
function UnBindWindow()
{
$(window).unbind('beforeunload', ReturnMessage);
}
$(window).bind('beforeunload',ReturnMessage );
});
</script>
Try this. It will work. jquery unload method is depreceted.
window.onbeforeunload = function(event) {
event.returnValue = "Write something clever here..";
};
I´m developing an android app with cordova latest version to use an android device with a Barcode reader connected through USB with keyboard emulation data transfer. I'm trying to handle the keydown events triggered by the barcode reader every time it reads a code, but the system fires the handle function but i can't find the event data telling me the keycodes.
I'm using that code on application starting:
document.addEventListener('keydown',
function(e){
//Here should come the data but e.keycode everytimes comes with 0
});
AS I'm saying on the above code the event var (e) always come with no information about the event triggered, is like a regular event object but comes with no relevant info about the key event.
I will be very gratefull with any help or suggestion.
Thanks in advance
Here is how I have done this with PG and a barcode scanning device:
Placeholder & timer:
var scannerdata = '';
var timer = null;
The main function:
function getInput (e) {
scannerdata += String.fromCharCode(e.which);
if(timer != null) {
clearTimeout(timer);
}
timer = setTimeout(function() { setInput() }, 100);
}
function setInput () {
//add scanner data to input field::
$('#someInput').val(scannerdata);
scannerdata = '';
//OR pass scanner data to function
someOtherfunction(scannerdata);
scannerdata = '';
}
Event used:
document.addEventListener('keyup', getInput, false);