Develop Reference

window.open affect web page

I have a link that opens a new window using window.open. The pop up works fine, however the normal web page stops loading objects (images, scripts, ajax scripts) and sometimes the page doesn't load at all.
Here is my code:
MyWindow=window.open('player.php','Player','width=500','height=300'); return false;
Is there anything I am doing wrong?
Thanks,
Peter

First of all, please be more specific: tell us more about your browser and which version, and possible your OS. It could be more related to the browser than to the web content.
Then on to the possible problem; you start with saying "I have a link that ...".
To me that sound like you use <a href="javascript:DoSomething()">. Or perhaps <a href="#" onclick="DoSomething()">.
I tried both in some modern browsers: Chrome v37, IE v11. Both browsers did not produce what you describe:
- Chrome v37 will happily keep on loading, even if I immediately click a "window.open()"-link on top of a (huge) webpage;
- IE v11 will someshow show "false", which is strange, but still not what you got.
In some cases I also got to deal with the popup blocker.
A general tip might be to NOT USE <a href> for things like this. Behaviour seems inconsistent across browsers, also these days there are better alternatives, such as <span onclick="">...</span> and <button onclick="">...<button> or by using JQuery or other frameworks (which I do not know much about).
Although this many not be a conclusive answer, maybe this can help you experiment on your own, and think about possible causes or alternative ways of doing things.

The behaviour you describe should definitely NOT normally happen. This is confirmed by robbmj's JSFiddle, that fails to reproduce the problem. That's evidence that something is going on in the main page that is not plain vanilla page loading, or your "link opening" has something unusual to it. Apart from the syntax error (you use four parameters, not three).
Since you do not supply information on either of these points (how do you load the main page? How do you trigger the popup-opening code?), we do not even know if the problem
might be browser-related; I'd start and try to test things in IE, Chrome and Mozilla to see
whether anything changes; this might provide some useful insights.
One possibility
A very strong possibility is that your inadvertent fourth parameter goes into the window.open() "replace" parameter, which is a boolean, and triggers undefined behaviour or simply an error that stops everything. You should have things somewhat working in IE and not working at all in Firefox.
You should also be able to see whether this is the case by using Firefox and the Firebug extension, or the Web Developer Console in Chrome.
Another possibility
A more esoteric possibility is that the way you define the link might make the browser believe you've actually moved on to another page, so that there's no point in continuing loading the current page. Depending on the browser, this might have to do with how the link is defined and could be remedied by defining it some other way.
For example it could conceivably happen if you had
...
which I suspect is what led user Tomzan to ask, "is the link something like javascript:...?"
So if this is the case, try with this instead (this works for me in IE9/Chrome/FF):
link
function openPopup() {
MyWindow = window.open('player.php', 'Player', 'width=500, height=300');
// Also try the following. You won't probably like the results (it should send the
// popup window behind), but if it works, it proves we're dealing with a browser
// issue there.
// Blur and refocus
// MyWindow.blur();
// window.focus();
// Just focus
// window.focus();
return false;
}
Workaround
A possibly acceptable workaround could be to disable the link altogether (or hide it via CSS), and only reactivate/show it upon main document being ready. This sidesteps the problem, even if user experience could be somewhat worse due to a longer wait.
But if it's so likely that a user clicks on the link before waiting for the whole page to load, I'd also consider not automatically loading the rest of the page at all, and reorganize information to provide a more streamlined navigation. Or maybe distribute it on two sequential pages. Again, unfortunately you did not supply enough information to do more than guess.

As you probably know, JavaScript is single threaded. Every event is queued until there is idle time for it to be executed.
In the case of window.open, both windows must share a single context to keep it thread-safe because the opened window can access to it's parent using window.opener.
I don't know how browsers implements it, but we can guess two possibilities:
Idle time is shared between the two windows. It means if the popup does many blocking statements, it can freeze the main window's events.
Only one of the two windows can be active, which depends on which one has the focus. In that case, all events may be paused in the main window when you're using the popup.
If you want a more precise answer, I need more details about your code.

document.addEventListener("DOMContentLoaded", function () {
//whatever the code
MyWindow=window.open('player.php','Player','width=500','height=300'); return false;
}, false);

Try to wrap the code in SetTimeout
setTimeout(function () {
window.open( .. )
}, 0);

Your document should be loaded first, then popup should be open, So write your javascript code in the scope of $(document).ready().
enter code here
$(document).ready(function(){
$("#clickme").click(function(e){
MyWindow=window.open('player.php','Player','width=500','height=300'); return false;
});
});

Why trigger F11 press event doesn't work?

I just read this question: Full Screen Page by pressing button instead of F11
The op asked to replace F11 with other hot keys, so I'm wondering that maybe I can simulate press F11 to get things work.
I learned that I can use trigger in JQuery to simulate key press event, so I do something like this:
$("body").keyup(function (e) {
alert(e.which);
});
var e = $.Event("keyup");
e.which = 122; // # Key code of F11
$("body").trigger(e);
When I run this, I got the alert says 122, but it seems that it doesn't give the hoped result. Is there a restriction there?
I made a fiddle here: http://jsfiddle.net/ap295/5/

I think this is the one :) to detect it ...
$(document).keyup(function(e){
if(e.which==122){
e.preventDefault();//kill anything that browser may have assigned to it by default
//do what ever you wish here :)
alert('F11 pressed');
return false;
}
});
but triggering it (NOT POSSIBLE)
But you will not prevent the browser from full screen :) ...
Reson given is that , lets say I have full screened it somehow, and wish to toggle out of it using F11 but u are preventing me, I would have to restart PC, [computer illiterates] which poses security risk as you are preventing a user from doing something he is expecting to do, and they may think PC is broken or something :) so ...there you are.

You can not do this. The linked answer in that question provides a way with jQuery to simulate key-presses, within the jQuery event framework.
You simply can not trigger or fake keypresses. So the answer of this question is:
No, this is impossible

You won't be able to override the browser's built-in hotkeys from within a web page.
You might be able to do it in a browser extension, but that's would surely be serious overkill just to change the application's hotkeys.
In any case, why would you even want to override the standard keyboard shortcuts? I don't get that. They've been standard for a long time; most users will be familiar with them, and will find it very odd if they've been changed to something else.

Don't look at is as a question of "How do I trigger F11?" - look at is as "How do I trigger or simulate full-screen?"
With older versions of IE you can open a new window straight into full-screen:
window.open(someURLorOther, '', 'fullscreen=yes, scrollbars=auto');
Or you can use window.open to open a new window of a specific size.
Or you can try to resize the current window to fill the screen:
moveTo(0,0);
resizeTo(screen.availWidth,screen.availHeight);
However just because you can doesn't mean you should. You should never resize the current window - this annoys practically everyone. Opening a new window to a size you choose is more reasonable, though if it's too big it can be annoying, and on a normal web page (where by "normal" I probably mean not some kind of browser-based data-entry app) it is nicer not to open new windows.

Prevent browser from closing in asp.net

I am using asp.net 2.0 with c#.
i want a pop up to be displayed when user tries to close the browser and if user click on "no" [i.e. he don't want browser to be closed] then it prevent browser to get closed.
Please help.
Thanks

the code they use is
window.onbeforeunload=function() {
if (somereasonorother) return "You did not save your stuff"
}

Pointy, this is entirely possible, and it's done by many web pages for perfectly reasonable reasons.
Try something like this:
function areYouSure() {
return "Are you sure you want to leave this page?";
}
window.onbeforeunload = areYouSure;

You can try to attach yourself to the onbeforeunload event:
<body onbeforeunload="ConfirmClose();">
But I have to mention that it won't work on all browsers. The only ones that prompted something after I closed a window were Chrome, Firefox and Internet Explorer; Opera ignored the code in the JavaScript method.
This is mostly because some browsers trigger the onbeforeunload event only when you're trying to leave the current page by visiting another one, and not when you close the current window / tab.

Can we capture an event when user presses X on the browser window?

is there a way differentiate between refresh and close in Javascript? i use window.onbeforeunload now which works great in IE. To void this being called anywhere but close, i set a flag on EVERY button ...this seems like a difficult, hacky solution, but after searching for hours on google, it was the best i could find.
Isn't there an onclose event for IE????? or onclick?
I only need to support IE, not FF, so please don't post anything FF related, I can't use it.
Thanks!

As far as I know there is no way to trap in JavaScript the click of the X (close) button in any browser. In my opinion this is due to security concern... JavaScript can't (an will never be able to) listen to OS messages like the close of the current window.
The only solution I know (which is what you seem to use) is:
<body onunload="alert('Fired');">
But as you find out if fires on close and on reload. Again this is normal behavior because, AFAIK, for the JS engine a reload is the same as a close then a reopen of the same page.

AFAIK, no there is no IE specific onclose event.

Is there anyway to trap the closing of a web browser?

Two years ago I had a need to trap the closing of a web browser as a javascript event for a web app. At the time I found there was no way doing this that worked for all browsers. IE had an event that I could used, but it was IE specific. I looked into other work arounds, like a heart beat sort of ping to the server, but I didn't like any of them at the time.
Is there anyway currently to trap the closing of a web browser now? Thanks!

You can use the
window.onbeforeunload
javascript event to do this, though this will trap more than just closing the browser. This event will also get fired each time someone tries to navigate to another page, refresh the current page, etc. It's handy if you're trying to do something like warn people of unsaved changes before they leave the current page.

onunload works in IE and Firefox.