Could you please give me the best way to detect only window close event for all browsers by jQuery?
I mean clicking X button on the browser or window.close(), not meaning F5, form submission,
window.location or link.
I was looking for many threads but have not found the right way yet.
You can use :
$(window).unload(function() {
//do something
});
Unload() is deprecated in jQuery version 1.8, so if you use jQuery > 1.8 you can use even beforeunload instead.
The beforeunload event fires whenever the user leaves your page for any reason.
$(window).on("beforeunload", function() {
return confirm("Do you really want to close?");
});
Source Browser window close event
There is no specific event for capturing browser close event.
You can only capture on unload of the current page.
By this method, it will be effected while refreshing / navigating the current page.
Even calculating of X Y postion of the mouse event doesn't give you good result.
The unload() method was deprecated in jQuery version 1.8.
so if you are using versions older than 1.8
then use -
$(window).unload(function(){
alert("Goodbye!");
});
and if you are using 1.8 and higher
then use -
window.onbeforeunload = function() {
return "Bye now!";
};
hope this will work :-)
There is no specific event for capturing browser close event. But we can detect by the browser positions XY.
<script type="text/javascript">
$(document).ready(function() {
$(document).mousemove(function(e) {
if(e.pageY <= 5)
{
//this condition would occur when the user brings their cursor on address bar
//do something here
}
});
});
</script>
Combine the mousemove and window.onbeforeunload event :-
I used for set TimeOut for Audit Table.
$(document).ready(function () {
var checkCloseX = 0;
$(document).mousemove(function (e) {
if (e.pageY <= 5) {
checkCloseX = 1;
}
else { checkCloseX = 0; }
});
window.onbeforeunload = function (event) {
if (event) {
if (checkCloseX == 1) {
//alert('1111');
$.ajax({
type: "GET",
url: "Account/SetAuditHeaderTimeOut",
dataType: "json",
success: function (result) {
if (result != null) {
}
}
});
}
}
};
});
You can solve this problem with vanilla-Js:
Unload Basics
If you want to prompt or warn your user that they're going to close your page, you need to add code that sets .returnValue on a beforeunload event:
window.addEventListener('beforeunload', (event) => {
event.returnValue = `Are you sure you want to leave?`;
});
There's two things to remember.
Most modern browsers (Chrome 51+, Safari 9.1+ etc) will ignore what you say and just present a generic message. This prevents webpage authors from writing egregious messages, e.g., "Closing this tab will make your computer EXPLODE! đź’Ł".
Showing a prompt isn't guaranteed. Just like playing audio on the web, browsers can ignore your request if a user hasn't interacted with your page. As a user, imagine opening and closing a tab that you never switch to—the background tab should not be able to prompt you that it's closing.
Optionally Show
You can add a simple condition to control whether to prompt your user by checking something within the event handler. This is fairly basic good practice, and could work well if you're just trying to warn a user that they've not finished filling out a single static form. For example:
let formChanged = false;
myForm.addEventListener('change', () => formChanged = true);
window.addEventListener('beforeunload', (event) => {
if (formChanged) {
event.returnValue = 'You have unfinished changes!';
}
});
But if your webpage or webapp is reasonably complex, these kinds of checks can get unwieldy. Sure, you can add more and more checks, but a good abstraction layer can help you and have other benefits—which I'll get to later. 👷‍♀️
Promises
So, let's build an abstraction layer around the Promise object, which represents the future result of work- like a response from a network fetch().
The traditional way folks are taught promises is to think of them as a single operation, perhaps requiring several steps- fetch from the server, update the DOM, save to a database. However, by sharing the Promise, other code can leverage it to watch when it's finished.
Pending Work
Here's an example of keeping track of pending work. By calling addToPendingWork with a Promise—for example, one returned from fetch()—we'll control whether to warn the user that they're going to unload your page.
const pendingOps = new Set();
window.addEventListener('beforeunload', (event) => {
if (pendingOps.size) {
event.returnValue = 'There is pending work. Sure you want to leave?';
}
});
function addToPendingWork(promise) {
pendingOps.add(promise);
const cleanup = () => pendingOps.delete(promise);
promise.then(cleanup).catch(cleanup);
}
Now, all you need to do is call addToPendingWork(p) on a promise, maybe one returned from fetch(). This works well for network operations and such- they naturally return a Promise because you're blocked on something outside the webpage's control.
more detail can view in this url:
https://dev.to/chromiumdev/sure-you-want-to-leavebrowser-beforeunload-event-4eg5
Hope that can solve your problem.
I written this script, to add JavaScript functionality to my online shop, the script works fine with Firefox and Chrome, but will not run on ie, and i am not sure why?
i am using jQuery(function( $ ){ instead of .ready due to script conflicts, i have tested the script using .ready and it still does not work with ie.
if anyone has an ideas they would be much appreciated.
jQuery(function( $ ){
setInterval(function(){ updatecart(); },8000);
$('.addtobag').on('click', function(){
event.preventDefault();
var postdata = new Object();
var action = $(this).closest('form').attr('action');
$(':input',$(this).closest('form')).each(function(evt){
var L = $(this).attr('name')
postdata[L] = $(this).val();
});
$.post(action, postdata);
generate('success'); //display banner
updatecart(); //update cart
});
var postdata = new Object();
postdata['basket'] = phpbasket;
function updatecart() {
$.post("/get_cart_details.php", postdata, function (data) {
var obj = $.parseJSON(data);
$('#qty_js').text(obj.items_qty);
$('#amt_js').text(obj.items_value);
});
}
function generate(type) {
var n = noty({
text: 'The item(s) have been added to your basket.',
type: type,
dismissQueue: true,
layout: 'topCenter',
theme: 'defaultTheme'
});
console.log('html: '+n.options.id);
setTimeout(function() {
$.noty.closeAll();
}, 5000);
}
});
Get rid of the console.log() statement. IE < 9 chokes on it and 9 only works if the console is open.
Try adding an event parameter in your click callback
$('.addtobag').on('click', function(event){
A couple things that might be tolerated in some browsers and not IE are that line 12 is missing a semicolon at the end, and the variable phpbasket is not defined (although if you defined it outside of the closure with 'var phpbasket' then you should be ok. If you debug it in IE 9 or higher, you should be able to see line numbers of errors in the console.
Not a complete answer, but it may point you in the right direction. I was actually about to ask a similar question - I found how to get IE 11 to load the jquery, but it required the user to hit "f12" and then "run activex" because apparently IE considered my code potentially unsafe. But when the user tells the activex to run, it works fine.
I am trying to learn how to use jquery to make touchscreen-friendly dropdown menus, so my code was basic - no css, no doctype, just basic html and js. If anyone else could shed some light on this it would be great.
I load this JS code from a bookmarklet:
function in_array(a, b)
{
for (i in b)
if (b[i] == a)
return true;
return false;
}
function include_dom(script_filename) {
var html_doc = document.getElementsByTagName('head').item(0);
var js = document.createElement('script');
js.setAttribute('language', 'javascript');
js.setAttribute('type', 'text/javascript');
js.setAttribute('src', script_filename);
html_doc.appendChild(js);
return false;
}
var itemname = '';
var currency = '';
var price = '';
var supported = new Array('www.amazon.com');
var domain = document.domain;
if (in_array(domain, supported))
{
include_dom('http://localhost/bklts/parse/'+domain+'.js');
alert(getName());
}
[...]
Note that the 'getName()' function is in http://localhost/bklts/parse/www.amazon.com/js. This code works only the -second- time I click the bookmarklet (the function doesn't seem to get loaded until after the alert()).
Oddly enough, if I change the code to:
if (in_array(domain, supported))
{
include_dom('http://localhost/bklts/parse/'+domain+'.js');
alert('hello there');
alert(getName());
}
I get both alerts on the first click, and the rest of the script functions. How can I make the script work on the first click of the bookmarklet without spurious alerts?
Thanks!
-Mala
Adding a <script> tag through DHTML makes the script load asynchroneously, which means that the browser will start loading it, but won't wait for it to run the rest of script.
You can handle events on the tag object to find out when the script is loaded. Here is a piece of sample code I use that seems to work fine in all browsers, although I'm sure theres a better way of achieving this, I hope this should point you in the right direction:
Don't forget to change tag to your object holding the <script> element, fnLoader to a function to call when the script is loaded, and fnError to a function to call if loading the script fails.
Bear in mind that those function will be called at a later time, so they (like tag) must be available then (a closure would take care of that normally).
tag.onload = fnLoader;
tag.onerror = fnError;
tag.onreadystatechange = function() {
if (!window.opera && typeof tag.readyState == "string"){
/* Disgusting IE fix */
if (tag.readyState == "complete" || tag.readyState == "loaded") {
fnLoader();
} else if (tag.readyState != "loading") {
fnError();
};
} else if (tag.readyState == 4) {
if (tag.status != 200) {
fnLoader();
}
else {
fnError();
};
};
});
It sounds like the loading of the external script (http://localhost/bklts/parse/www.amazon.com/js) isn't blocking execution until it is loaded. A simple timeout might be enough to give the browser a chance to update the DOM and then immediately queue up the execution of your next block of logic:
//...
if (in_array(domain, supported))
{
include_dom('http://localhost/bklts/parse/'+domain+'.js');
setTimeout(function() {
alert(getName());
}, 0);
}
//...
In my experience, if zero doesn't work for the timeout amount, then you have a real race condition. Making the timeout longer (e.g. 10-100) may fix it for some situations but you get into a risky situation if you need this to always work. If zero works for you, then it should be pretty solid. If not, then you may need to push more (all?) of your remaining code to be executed into the external script.
The best way I could get working: Don't.
Since I was calling the JS from a small loader bookmarklet anyway (which just tacks the script on to the page you're looking at) I modified the bookmarklet to point the src to a php script which outputs the JS code, taking the document.domain as a parameter. As such, I just used php to include the external code.
Hope that helps someone. Since it's not really an answer to my question, I won't mark this as the accepted answer. If someone has a better way, I'd love to know it, but I'll be leaving my code as is:
bookmarklet:
javascript:(function(){document.body.appendChild(document.createElement('script')).src='http://localhost/bklts/div.php?d='+escape(document.domain);})();
localhost/bklts/div.php:
<?php
print("
// JS code
");
$supported = array("www.amazon.com", "www.amazon.co.uk");
$domain = #$_GET['d']
if (in_array($domain, $supported))
include("parse/$domain.js");
print("
// more JS code
");
?>
I have a system where I send an Ajax command, which returns a script block with a function in it. After this data is correctly inserted in the DIV, I want to be able to call this function to perform the required actions.
Is this possible?
I think to correctly interpret your question under this form: "OK, I'm already done with all the Ajax stuff; I just wish to know if the JavaScript function my Ajax callback inserted into the DIV is callable at any time from that moment on, that is, I do not want to call it contextually to the callback return".
OK, if you mean something like this the answer is yes, you can invoke your new code by that moment at any time during the page persistence within the browser, under the following conditions:
1) Your JavaScript code returned by Ajax callback must be syntactically OK;
2) Even if your function declaration is inserted into a <script> block within an existing <div> element, the browser won't know the new function exists, as the declaration code has never been executed. So, you must eval() your declaration code returned by the Ajax callback, in order to effectively declare your new function and have it available during the whole page lifetime.
Even if quite dummy, this code explains the idea:
<html>
<body>
<div id="div1">
</div>
<div id="div2">
<input type="button" value="Go!" onclick="go()" />
</div>
<script type="text/javascript">
var newsc = '<script id="sc1" type="text/javascript">function go() { alert("GO!") }<\/script>';
var e = document.getElementById('div1');
e.innerHTML = newsc;
eval(document.getElementById('sc1').innerHTML);
</script>
</body>
</html>
I didn't use Ajax, but the concept is the same (even if the example I chose sure isn't much smart :-)
Generally speaking, I do not question your solution design, i.e. whether it is more or less appropriate to externalize + generalize the function in a separate .js file and the like, but please take note that such a solution could raise further problems, especially if your Ajax invocations should repeat, i.e. if the context of the same function should change or in case the declared function persistence should be concerned, so maybe you should seriously consider to change your design to one of the suggested examples in this thread.
Finally, if I misunderstood your question, and you're talking about contextual invocation of the function when your Ajax callback returns, then my feeling is to suggest the Prototype approach described by krosenvold, as it is cross-browser, tested and fully functional, and this can give you a better roadmap for future implementations.
Note: eval() can be easily misused, let say that the request is intercepted by a third party and sends you not trusted code. Then with eval() you would be running this not trusted code. Refer here for the dangers of eval().
Inside the returned HTML/Ajax/JavaScript file, you will have a JavaScript tag. Give it an ID, like runscript. It's uncommon to add an id to these tags, but it's needed to reference it specifically.
<script type="text/javascript" id="runscript">
alert("running from main");
</script>
In the main window, then call the eval function by evaluating only that NEW block of JavaScript code (in this case, it's called runscript):
eval(document.getElementById("runscript").innerHTML);
And it works, at least in Internet Explorer 9 and Google Chrome.
It is fully possible, and there are even some fairly legitimate use cases for this. Using the Prototype framework it's done as follows.
new Ajax.Updater('items', '/items.url', {
parameters: { evalJS: true}
});
See documentation of the Ajax updater. The options are in the common options set. As usual, there are some caveats about where "this" points to, so read the fine print.
The JavaScript code will be evaluated upon load. If the content contains function myFunc(),
you could really just say myFunc() afterwards. Maybe as follows.
if (window["myFunc"])
myFunc()
This checks if the function exists. Maybe someone has a better cross-browser way of doing that which works in Internet Explorer 6.
That seems a rather weird design for your code - it generally makes more sense to have your functions called directly from a .js file, and then only retrieve data with the Ajax call.
However, I believe it should work by calling eval() on the response - provided it is syntactically correct JavaScript code.
With jQuery I would do it using getScript
Just remember if you create a function the way below through ajax...
function foo()
{
console.log('foo');
}
...and execute it via eval, you'll probably get a context problem.
Take this as your callback function:
function callback(result)
{
responseDiv = document.getElementById('responseDiv');
responseDiv.innerHTML = result;
scripts = responseDiv.getElementsByTagName('script');
eval(scripts[0]);
}
You'll be declaring a function inside a function, so this new function will be accessible only on that scope.
If you want to create a global function in this scenario, you could declare it this way:
window.foo = function ()
{
console.log('foo');
};
But, I also think you shouldn't be doing this...
Sorry for any mistake here...
I would like to add that there's an eval function in jQuery allowing you to eval the code globally which should get you rid of any contextual problems. The function is called globalEval() and it worked great for my purposes. Its documentation can be found here.
This is the example code provided by the jQuery API documentation:
function test()
{
jQuery.globalEval("var newVar = true;")
}
test();
// newVar === true
This function is extremely useful when it comes to loading external scripts dynamically which you apparently were trying to do.
A checklist for doing such a thing:
the returned Ajax response is eval(ed).
the functions are declared in form func_name = function() {...}
Better still, use frameworks which handles it like in Prototype. You have Ajax.updater.
PHP side code
Name of file class.sendCode.php
<?php
class sendCode{
function __construct($dateini,$datefin) {
echo $this->printCode($dateini,$datefin);
}
function printCode($dateini,$datefin){
$code =" alert ('code Coming from AJAX {$this->dateini} and {$this->datefin}');";
//Insert all the code you want to execute,
//only javascript or Jquery code , dont incluce <script> tags
return $code ;
}
}
new sendCode($_POST['dateini'],$_POST['datefin']);
Now from your Html page you must trigger the ajax function to send the data.
.... <script src="http://code.jquery.com/jquery-1.9.1.js"></script> ....
Date begin: <input type="text" id="startdate"><br>
Date end : <input type="text" id="enddate"><br>
<input type="button" value="validate'" onclick="triggerAjax()"/>
Now at our local script.js we will define the ajax
function triggerAjax() {
$.ajax({
type: "POST",
url: 'class.sendCode.php',
dataType: "HTML",
data : {
dateini : $('#startdate').val(),
datefin : $('#enddate').val()},
success: function(data){
$.globalEval(data);
// here is where the magic is made by executing the data that comes from
// the php class. That is our javascript code to be executed
}
});
}
This code work as well, instead eval the html i'm going to append the script to the head
function RunJS(objID) {
//alert(http_request.responseText);
var c="";
var ob = document.getElementById(objID).getElementsByTagName("script");
for (var i=0; i < ob.length - 1; i++) {
if (ob[i + 1].text != null)
c+=ob[i + 1].text;
}
var s = document.createElement("script");
s.type = "text/javascript";
s.text = c;
document.getElementsByTagName("head")[0].appendChild(s);
}
My usual ajax calling function:
function xhr_new(targetId, url, busyMsg, finishCB)
{
var xhr;
if(busyMsg !== undefined)
document.getElementById(targetId).innerHTML = busyMsg;
try { xhr = new ActiveXObject('Msxml2.XMLHTTP'); }
catch(e)
{
try { xhr = new ActiveXObject('Microsoft.XMLHTTP'); }
catch(e2)
{
try { xhr = new XMLHttpRequest(); }
catch(e3) { xhr = false; }
}
}
xhr.onreadystatechange = function()
{
if(xhr.readyState == 4)
{
if(xhr.status == 200)
{
var target = document.getElementById(targetId)
target.innerHTML = xhr.responseText;
var scriptElements = target.getElementsByTagName("script");
var i;
for(i = 0; i < scriptElements.length; i++)
eval(scriptElements[i].innerHTML);
if(finishCB !== undefined)
finishCB();
}
else
document.getElementById(targetId).innerHTML = 'Error code: ' + xhr.status;
}
};
xhr.open('GET', url, true);
xhr.send(null);
// return xhr;
}
Some explanation:
targetId is an (usually div) element ID where the ajax call result text will goes.
url is the ajax call url.
busyMsg will be the temporary text in the target element.
finishCB will be called when the ajax transaction finished successfully.
As you see in the xhr.onreadystatechange = function() {...} all of the <script> elements will be collected from the ajax response and will be run one by one. It appears to work very well for me. The two last parameter is optional.
I've tested this and it works. What's the problem? Just put the new function inside your javascript element and then call it. It will work.
This does not sound like a good idea.
You should abstract out the function to include in the rest of your JavaScript code from the data returned by Ajax methods.
For what it's worth, though, (and I don't understand why you're inserting a script block in a div?) even inline script methods written in a script block will be accessible.
I tried all the techniques offered here but finally the way that worked was simply to put the JavaScript function inside the page / file where it is supposed to happen and call it from the response part of the Ajax simply as a function:
...
}, function(data) {
afterOrder();
}
This Worked on the first attempt, so I decided to share.
I solved this today by putting my JavaScript at the bottom of the response HTML.
I had an AJAX request that returned a bunch of HTML that was displayed in an overlay. I needed to attach a click event to a button in the returned response HTML/overlay. On a normal page, I would wrap my JavaScript in a "window.onload" or "$(document).ready" so that it would attach the event handler to the DOM object after the DOM for the new overlay had been rendered, but because this was an AJAX response and not a new page load, that event never happened, the browser never executed my JavaScript, my event handler never got attached to the DOM element, and my new piece of functionality didn't work. Again, I solved my "executing JavaScript in an AJAX response problem" by not using "$(document).ready" in the head of the document, but by placing my JavaScript at the end of the document and having it run after the HTML/DOM had been rendered.
If your AJAX script takes more than a couple milliseconds to run, eval() will always run ahead and evaluate the empty response element before AJAX populates it with the script you're trying to execute.
Rather than mucking around with timing and eval(), here is a pretty simple workaround that should work in most situations and is probably a bit more secure. Using eval() is generally frowned upon because the characters being evaluated as code can easily be manipulated client-side.
Concept
Include your javascript function in the main page. Write it so that any dynamic elements can be accepted as arguments.
In your AJAX file, call the function by using an official DOM event (onclick, onfocus, onblur, onload, etc.) Depending on what other elements are in your response, you can get pretty clever about making it feel seamless. Pass your dynamic elements in as arguments.
When your response element gets populated and the event takes place, the function runs.
Example
In this example, I want to attach a dynamic autocomplete list from the jquery-ui library to an AJAX element AFTER the element has been added to the page. Easy, right?
start.php
<!DOCTYPE html>
<html>
<head>
<title>Demo</title>
<!-- these libraries are for the autocomplete() function -->
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/themes/ui-lightness/jquery-ui.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.11.4/jquery-ui.min.js"></script>
<script type="text/javascript">
<!--
// this is the ajax call
function editDemoText(ElementID,initialValue) {
try { ajaxRequest = new XMLHttpRequest();
} catch (e) {
try { ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try { ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {
return false;
}}}
ajaxRequest.onreadystatechange = function() {
if ( ajaxRequest.readyState == 4 ) {
var ajaxDisplay = document.getElementById('responseDiv');
ajaxDisplay.innerHTML = ajaxRequest.responseText;
}
}
var queryString = "?ElementID="+ElementID+"&initialValue="+initialValue;
ajaxRequest.open("GET", "ajaxRequest.php"+queryString, true);
ajaxRequest.send(null);
}
// this is the function we wanted to call in AJAX,
// but we put it here instead with an argument (ElementID)
function AttachAutocomplete(ElementID) {
// this list is static, but can easily be pulled in from
// a database using PHP. That would look something like this:
/*
* $list = "";
* $r = mysqli_query($mysqli_link, "SELECT element FROM table");
* while ( $row = mysqli_fetch_array($r) ) {
* $list .= "\".str_replace('"','\"',$row['element'])."\",";
* }
* $list = rtrim($list,",");
*/
var availableIDs = ["Demo1","Demo2","Demo3","Demo4"];
$("#"+ElementID).autocomplete({ source: availableIDs });
}
//-->
</script>
</head>
<body>
<!-- this is where the AJAX response sneaks in after DOM is loaded -->
<!-- we're using an onclick event to trigger the initial AJAX call -->
<div id="responseDiv">I am editable!</div>
</body>
</html>
ajaxRequest.php
<?php
// for this application, onfocus works well because we wouldn't really
// need the autocomplete populated until the user begins typing
echo "<input type=\"text\" id=\"".$_GET['ElementID']."\" onfocus=\"AttachAutocomplete('".$_GET['ElementID']."');\" value=\"".$_GET['initialValue']."\" />\n";
?>
I needed to get something to do this, I find that this has worked for a long time for me, just posting this here as one of many solutions, I like to have solutions without jQuery and the following function may help you, you can pass the full html with script tags in and it will parse and execute.
function parseScript(_source) {
var source = _source;
var scripts = new Array();
// Strip out tags
while(source.indexOf("<script") > -1 || source.indexOf("</script") > -1) {
var s = source.indexOf("<script");
var s_e = source.indexOf(">", s);
var e = source.indexOf("</script", s);
var e_e = source.indexOf(">", e);
// Add to scripts array
scripts.push(source.substring(s_e+1, e));
// Strip from source
source = source.substring(0, s) + source.substring(e_e+1);
}
// Loop through every script collected and eval it
for(var i=0; i<scripts.length; i++) {
try {
if (scripts[i] != '')
{
try { //IE
execScript(scripts[i]);
}
catch(ex) //Firefox
{
window.eval(scripts[i]);
}
}
}
catch(e) {
// do what you want here when a script fails
if (e instanceof SyntaxError) console.log (e.message+' - '+scripts[i]);
}
}
// Return the cleaned source
return source;
}
Federico Zancan's answer is correct but you don't have to give your script an ID and eval all your script. Just eval your function name and it can be called.
To achieve this in our project, we wrote a proxy function to call the function returned inside the Ajax response.
function FunctionProxy(functionName){
var func = eval(functionName);
func();
}