I discovered a problem that seems to reproduce always when opening a piece of html and javascript in IE8.
<html>
<body>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$(window).resize(function() {
console.log('Handler for .resize() called');
});
});
</script>
<div id="log">
</div>
</body>
</html>
Loading this file in IE8 and opening Developer Tools will show that the log message is printed continuously after one resize of the browser window.
Does anyone has an idea why? This is not happening in IE7 or IE9, nor in other browsers (or at least their latest versions).
UPDATE
One solution to prevent the continuos trigger of resize() is to add handler on document.body.onresize if the browser is IE8.
var ieVersion = getInternetExplorerVersion();
if (ieVersion == 8) {
document.body.onresize = function () {
};
}
else {
$(window).resize(function () {
});
}
But this does not answer my question: is the continuous firing of resize() a bug in IE8?
If "show window contents while dragging" is switched on, you will be inundated with resize events. I guess you're testing IE8 on a separate Windows machine which has this effect enabled (Display Properties -> Appearance -> Effects...).
To counteract this, you can wrap & trap the resize events to tame them: http://paulirish.com/demo/resize
This article says Chrome, Safari & Opera suffer from this too.
I only see the issue you are describing if an element on the page is resized (as described in this question). Your example doesn't work for me, but I assume for you it is appending the console message in the log div that you have there, which means that it is resizing the div and triggering the window resize event.
The answer that Lee gave is correct, but the method in the link didn't work for me. Here's what I did:
var handleResize = function(){
$(window).one("resize", function() {
console.log('Handler for .resize() called');
setTimeout("handleResize()",100);
});
}
handleResize();
This way, the handler is unbound as soon as it fires, and is only re-bound after you've finished all your actions that might re-trigger a page resize. I threw in a setTimeout to provide additional throttling. Increase the value in case your scripts need more time.
Related
Inside the Javascript console, if I execute:
m = window.open(location.origin);
m.resizeTo(400, 400);
The window will resize, but if I just execute:
window.resizeTo(400, 400);
then nothing happens. I understand the reason for this behavior. How can I detect situations where window.resizeTo will do nothing?
Approach 1:
You can use the window.opener property. If it's null, then you did not open that window and thus cannot resize it.
window.parent is intended more for iframes and the like.
Such as:
if (m.opener) {
m.resizeTo(400, 400);
} else {
// You did not create the window, and will not be able to resize it.
}
Approach 2:
ajp15243 brings up a good point, so one thing you could do is listen to the resize event and see if your resizeTo worked:
var resizeFired = false;
...
var triggeredResize = function() {
resizeFired = true;
m.removeEventListener('resize', triggeredResize);
}
m.addEventListener('resize', triggeredResize, true);
m.resizeTo(400, 400);
if (resizeFired) {
// Your resize worked.
}
I haven't been able to fully test this, but it's one potential approach nonetheless. For IE8 and below you may need to use attachEvent instead. Also as #Wesabi noted, the resize may fire for other events (and may fire if the user is resizing the window as the listener as attached), so it's best to execute this is the shortest time span possible.
Approach 3:
Another approach would be to call m.resizeTo(400, 400) and then check the window size to see if the current size is equal to what you set it to:
m.resizeTo(400, 400);
if (w.outerWidth != 400 && w.outerHeight != 400) {
// Your resize didn't work
}
The easiest thing to do would be checking if the window has a parent. if !window.parent, it means it's the main window which cannot be resized with JS, else you have your resize case.
Edit: Igor posted it before I found it: you want m.opener() not window.parent
MDN is a great JavaScript resource: https://developer.mozilla.org/en-US/docs/Web/API/Window.resizeTo
Since Firefox 7, it's no longer possible for a web site to change the default size of a window in a browser, according to the following rules:
You can't resize a window or tab that wasn’t created by window.open.
You can't resize a window or tab when it’s in a window with more than one tab.
SO, you need to detect if you are a child window:
https://developer.mozilla.org/en-US/docs/Web/API/Window.opener
if (window.opener) {
console.log('I can be resized');
} else {
console.log('I cannot be resized');
}
I've the same problem depicted in iOS 5 pauses JavaScript when tab is not active thread.
My question is if I can be noticed when come back to the paused tab.
onfocus and onblur events don't work on to the to be paused tab.
The code:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="http://code.jquery.com/jquery-1.7.1.min.js" ></script>
<script type="text/javascript">
window.onblur = function () {
console.log("blur");
$("#whatevent").append("blur<br/>");
}
window.onfocus = function () {
console.log("focus");
$("#whatevent").append("focus<br/>");
}
window.onunload = function () {
console.log("unload");
$("#whatevent").append("unload<br/>");
}
window.onload = function () {
console.log("load");
$("#whatevent").append("load<br/>");
}
</script>
</head>
<body>
<div id="whatevent"></div>
</body>
</html>
none but onload (but only the first time I load the page) events works on iPad when I switch tab.
Someone posed this very question over two years ago with this query. Unfortunately, it was met with only a couple of answers, one of which seems to be the only method to achieve this effect. Until Apple can implement the full Page Visibility API in mobile safari, I'm left with using this custom object I created that will use the API and fall back to a heart beat ticker if it's unavailable. However, as far as I can tell, there is no great way to check an imminent tab switch.
Here's a basic fiddle of the object demonstrating its only real method. It essentially just accepts a handler function for a focus event that gets fired whenever the browser returns the source tab. The fallback is hacky at best and will fire not just on a page re-entry but whenever scripting stops for longer than the timer threshold; which could be whenever the keyboard is visible, on scroll, or if a running script prevents the requestAnimationFrame from firing. Since scrolling is the most common behavior, I've added a handler that resets the last saved time so that the focus event refrains from firing.
This is the main portion of the script that includes the "hacky" method as described above:
_that.onFocus = function(handler, params) {
var hiddenProp = getHiddenProp();
console.log("Hidden prop: " + hiddenProp);
if (hiddenProp) {
var evtName = hiddenProp.replace(/[H|h]idden/, "") + "visibilitychange";
document.addEventListener(evtName, function(e) {
if (isHidden()) {
handler(e, params);
}
}, false);
}else {
var handlerObj = {"handler": handler};
if (params !== undefined) {handlerObj.params = params}
_handlers.push(handlerObj);
startLoop();
}
};
The rest may be read in the fiddle. In order to see the fallback you'll have to use a tablet (why else would you be needing this function without one?).
Note that the .onFocus method may accept an array of params for its second param that it will then pass to your event handler. This means that your event handler will always have an event object for it's first param (or null if the API is not supported) and your array of params as its second param.
Also not that this code has been tested for all of a couple hours so it may be prone to glitchiness. I would appreciate any constructive criticism to make it production worthy until Mobile Safari gets its butt in gear.
Here is where I'm at:
onResize = (function($) {
//Do stuff
});
$(document).ready(onResize);
$(window).bind('resize', onResize);
The script calculates the width of it's containing div and then lays out a gallery accordingly. It runs onload correctly (no matter the window width ) but doesn't seem to fire on resize. The issue? Creates layout problems with my media Queries.
Your code runs correctly in Chrome.
Justin W Hall, I tried this in my chrome console:
onResize = (function($) { console.log('resized') });
console.log('resized')
});
$(document).ready(onResize);
$(window).resize(onResize);
and it worked just fine.
ps. If you run this code, you'll notice that onResize function fires two times (showing 2 'resized' messages) when you resize the window.
i'm trying to call a method inside a flash movie from js, every time the mouse leaves the "div".
It works on Internet Explorer, but not in firefox. any ideas?
here is the html script:
<script type="text/javascript">
window.onload = function(e){
init();
}
function init(){
document.getElementById('div').onmouseout = function(e) {
method();
}
}
function method(){
flashid.anothermethod();
}
</script>
and the flash script:
import flash.external.ExternalInterface;
function outdiv(){
//do something;
}
ExternalInterface.addCallback('anothermethod', outdiv);
Any ideas what's wrong?
EDIT: here is example of the problem, there is an alert for the js and the flash should be able to remove the swf (see a gray background? it works! see a image, flash didn't receive the call):
http://complexresponse.com/out/addcallback_ff.html
this should work with internet explorer / safari / chrome (pc/mac) only firefox seams to reject this.
the problem is that the event probably doesn't fire because of the flash. try to handle the mouseout event in the flash on your main movieclip and see if it fires
Ensure that you're embedding flash with wmode set to "transparent". If not you won't get JavaScript events for DOM objects behind the flash object.
I'm trying to launch a popup window from a Javascript function and ensure it has focus using the following call:
window.open(popupUrl, popupName, "...").focus();
It works in every other browser, but IE8 leaves the new window in the background with the flashing orange taskbar notification. Apparently this is a feature of IE8:
http://msdn.microsoft.com/en-us/library/ms536425(VS.85).aspx
It says that I should be able to focus the window by making a focus() call originating from the new page, but that doesn't seem to work either. I've tried inserting window.focus() in script tags in the page and the body's onload but it has no effect. Is there something I'm missing about making a focus() call as the page loads, or another way to launch a popup that IE8 won't hide?
The IE8 is not allowing this feature because of security issues
Windows Internet Explorer 8 and later. The focus method no longer brings child windows (such as those created with the open method) to the foreground. Child windows now request focus from the user, usually by flashing the title bar. To directly bring the window to the foreground, add script to the child window that calls the focus method of its window object
http://msdn.microsoft.com/en-us/library/ms536425%28VS.85%29.aspx
You might try this. Not sure if it will work though>
var isIE = (navigator.appName == "Microsoft Internet Explorer");
var hasFocus = true;
var active_element;
function setFocusEvents() {
active_element = document.activeElement;
if (isIE) {
document.onfocusout = function() { onWindowBlur(); }
document.onfocusin = function() { onWindowFocus(); }
} else {
window.onblur = function() { onWindowBlur(); }
window.onfocus = function() { onWindowFocus(); }
}
}
function onWindowFocus() {
hasFocus = true;
}
function onWindowBlur() {
if (active_element != document.activeElement) {
active_element = document.activeElement;
return;
}
hasFocus = false;
}
Yeah I can't test this on IE8 at the moment either but have a play with this document.ready method instead of the body.onload:
test1.html:
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
function openNewWindow()
{
window.open("test2.html", null, "height=200, width=200");
}
</script>
</head>
<body>
<a onclick="openNewWindow()">Open</a>
</body>
</html>
test2.html:
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){ window.focus(); });
</script>
</head>
<body>
<div id="container" style="background:blue;height:200px;width:300px">
</div>
</body>
</html>
I figured out what the issue was - turns out the reason running window.focus() in the onload wasn't working was because the first window.open().focus() call caused it to start flashing in the background, and after that any subsequent focus calls wouldn't work. If I don't try to focus it from the calling window but only from the popup it comes to the front normally. What an annoying "feature"...
The problem is the Window.focus method does not work in Internet Explorer 8 (IE 8). It's not a pop up blocker or any settings in IE 8 or above; it's due to some security I believe to stop annoying pop-ups being brought back up to the top.
after a lot of hair pulling and googling i found the following:
Microsoft suggest updates but this doesn't appear to work plus how do they seriously expect me to ask all of the users my site to update their machines!
so I've come up with this work around or fix.
What i do with the window is:
first I check if the window is open
if it's open, close it
open a new fresh version of the window on top.
javascript code to include at header or in separate file:
function nameoflink()
{
var nameofwindow = window.open('pagetolinkto.htm','nameofwindow','menubar=1,resizable=1,width=350,height=250');
if (nameofwindow) {
nameofwindow.close();
}
window.open('pagetolinkto.htm','nameofwindow,'menubar=1,resizable=1,width=350,height=250');
return false;
}
link on the page:
Click Here to go to name of link
Tested in MS Windows 7 with IE8 not sure of exact version.