Situation
We have a situation, where we need to onclick-open a new tab in browsers after performing an XHR / Ajax request.
We do this by setting the Ajax request to be performed synchronously to keep the context of the trusted click event and this works fine.
Problem
However, in the latest Chrome version (36), we experience popup warnings when the Ajax call has some lag... A lag of 2 seconds is enough for Chrome to display a popup warning instead of opening the tab like it is supposed to. The code itself is working, I can click that button multiple times and it works all the time until the request experiences some lag. Then I get the popup warning...
Question
Is there a timeout applied to synchronous Ajax requests during which it needs to be finished for the trusted event to still be available?
Is there any way to circumvent that? After all, the call is already synchronous and freezing everything else until the result arrives.
Thanks.
Update JSFiddle
Update: I've created a JSFiddle to demonstrate the problem: http://jsfiddle.net/23JNw/9/
/**
* This method will give open the popup without a warning.
*/
function performSlowSyncronousRequest() {
$.ajax({
url: '/echo/html',
data: {delay: 2}, //JSfiddle will delay the answer by 2 seconds
success: function(){
window.open('http://www.thirtykingdoms.com'); //this causes the popup warning in Chrome
},
async: false
});
}
What might fix this is opening the new tab before the XHR request returns and while you are still in the trusted context. Browser tabs and windows opened via Javascript maintain connections with the parent window and can communicate back and forth.
If you open a new tab when a link is clicked, you can show a loading screen in the new window while the XHR call runs. This workflow isn't quite as clean as your original request, but it would be a viable solution with some thought. The script below is just a quick example using window.setTimeout() to simulate an async XHR request.
<html>
<body>
<h4>
Hello
</h4>
<a id="openWindow" href="">Make http call and open window.</a>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<script>
(function ($) {
var newWindow = null,
timeout = null;
$(document).ready(function () {
$('#openWindow').on('click', function (evt) {
evt.preventDefault();
newWindow = window.open('about:blank', 'tempWindow');
$(newWindow.document).find('body').append('<div class="loading">Loading...</div>');
timeout = window.setTimeout(function () {
// simulates async XHR
$(newWindow.document).find('.loading').remove();
$(newWindow.document).find('body').append('Done loading, here\'s your data');
}, 5000)
});
});
}(jQuery));
</script>
</body>
Hello @ChristopherLörken. Can you give a example code or a fiddle of what are you doing? Maybe I'm not understanding what you want.
I think this will help:
If you need the event in your context, you can save the reference of the event for posterior use, like in a callback.
Example using jQuery:
$(myBtn).click(function(ev){
var event = ev; //Save the event object reference
$.ajax({
// ... your options
success: function(res){
//do stuff with the event in the callback
console.log(event);
});
});
In this way, you don't need call a sync request to use the event in your context and, as a async request, chrome don't complain with that. :)
Your problem is not with XMLHttpRequest, but with delay (sync delay, maybe bug in WebKit/Blink)
See example (http://jsfiddle.net/23JNw/32/ sandbox in Snippet don't allow pop-ups):
function performSlowSyncronousRequest() {
var endsIn, initial;
delay = 5000;
endsIn = new Date().getTime() + delay;
for (; endsIn >= new Date().getTime();) {}//Delay
window.open('http://www.thirtykingdoms.com');
}
<button onclick="performSlowSyncronousRequest()">Test case</button>
Note: that sjax (XMLHttpRequest sync) is considered obsolete by some browsers is very bad for the user experience.
I tried simulate click, but not work:
function clickFire(evt){
var el, evtFake, pos;
el = document.createElement("a");
el.href = "javascript:void(0);";
el.innerHTML = "test";
el.onclick = evt;
document.body.appendChild(el);
pos = el.getBoundingClientRect();
evtFake = new MouseEvent("click", {
bubbles: false,
cancelable: false,
view: window,
detail: 0,
screenX: window.screenX,
screenY: window.screenY,
clientX: pos.left + 1,
clientY: pos.top + 1,
ctrlKey: false,
shiftKey: false,
altKey: false,
metaKey: false,
button: 1,
buttons: 0,
relatedTarget: el
});
el.dispatchEvent(evtFake);
window.setTimeout(function() {
document.body.removeChild(el);
}, 1);
}
window.setTimeout(function() {
clickFire(function() {
window.open("http://stackoverflow.com");
});
}, 1000);
Note: The web browsers are very smart today and we will hardly get cheat them.
Solution
Don't use pop-ups ( I hate pop-ups :) ), try simulate "pop-up" using <iframe>: http://demos.jquerymobile.com/1.4.0/popup-iframe/
Or add um button using modal (like bootstrap) and and place a message asking the user clicks:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet"/>
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="exampleModalLabel">New message</h4>
</div>
<div class="modal-body">
Open pop-up :)
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Cancel</button>
<button id="popupIsNotPopular" type="button" class="btn btn-primary">Ok</button>
</div>
</div>
</div>
</div>
window.setTimeout(function() {
$('#exampleModal').modal();
}, 2000);
$("#popupIsNotPopular").click(function() {
window.open("http://www.stackoverflow.com");
});
