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Completely delete all instances of a div with a specific class using javascript/jquery?

I am using Popup.js by Toddish.
http://docs.toddish.co.uk/popup/demos/
Long story short, the popup plugin creates divs by default given the classes ".popup_back" and ".popup_cont".
I have another button I wish to press which should completely delete the added divs with those classes after they have been generated and added to the html. As if they never even existed. Surely this is possible?
I have tried running a function which simply runs:
$(".popup_back").remove();
$(".popup_cont").remove();
As shown in this example:
http://www.w3schools.com/jquery/tryit.asp?filename=tryjquery_dom_remove
Unfortunately despite the code running, the actual divs are never deleted as required.
Any ideas? I am new to this kind of thing and have googled around and read a lot about DOM etc but am yet to crack it.
Thanks
EDIT:
In reply to the comments:
The Javascript:
function removePopups() { // This function is called to remove the popups.
console.log("removing...");
$(".popup_back").remove();
$(".popup_cont").remove();
}
function func(url) { // url is the url of the image to be displayed within the popup.
removePopups(); // As soon as the function casillas is called, removePopups is used to remove any existing instances of the divs.
$('a.theimage').popup({ // This is where the Popup plugin is utilised.
content : $(url),
type : 'html'
});
}
The HTML:
<a class="theimage" onclick="func('image/image1.jpg')" href="#" >
Long story short, an image is displayed in the popup.
I think the issue is that the popup plugin runs due to the class but the function func is never actually run when the click occurs. However simultaneously "removing..." still prints out in the console which tells me that the function IS being executed. The problem is I want the popup plugin to run together with the javascript function. Is there a solution for this conflict?

Your implementation should really be as simple as this:
<a class="theimage" href="#" >Open</a>
Bind the popup creation to your popup link:
$('a.theimage').popup({
content : 'image/image1.jpg',
type : 'html'
});
I'm speculating here, but what might be happening is that you're invoking the popup twice by binding the popup() call to a click handler in your markup. The popup plugin already binds the popup creation to a click event.
View working demo. Note the 3 external resource: the popup CSS, the popup JS, and the jQuery JS.

Jquery - Targeting elements that have been changed after page load

I have not been able to find any discussion of what I'm struggling with on this site or any other, but perhaps I'm not asking the right question. I'm working on a web interface for a wireless speaker powered by the raspberry pi, and (as I inherited it) almost all the POST requests are done with calls to $.ajax. $().ready() is as follows:
$().ready(function (){
$(document).ajaxStart(function (){
$.blockUI({ message: '<img id="loadimg" src="img/loading.gif" width="64" />'});
}).ajaxStop($.unblockUI);
$("nav.setup-nav a").not("[target='_blank']").on("click", function (event){
event.preventDefault();
var href=$(this).attr('href');
$.ajax({
type:"POST",
url:href,
success:function (data){
$(".contentPanel").html(data);
$(this).blur();
$("html, body").animate({ scrollTop:100, scrollLeft:400}, 600);
},
});
return false;
});
});
Which forces all the content of the linked-to pages in the nav menu to load inside a div in the center of the page. That is, except for pages with target="_blank" attribute. This is so event.preventDefault and the UI blocking stuff doesn't get called when linking to an external page that we want to load in a new window. I'll try to concisely describe my issue: One of the menu items is (conditionally) a link to a web-based MPD client, which we definitely do NOT want to load inside a div on the same page, and thus has target="_blank" attribute. The problem is the user can also choose to enable or disable the MPD daemon through the web-interface. PHP handles the setting of all these kinds of state variables. Basically like this:
if ($config->is_flag_set($MPD_FLAG))
{
echo '<li><a target="_blank" id="mpd" href="rompr/">Local Playback Web Interface</a></li>';
}
else
{
echo '<li><a id="mpd" href="local-disabled.php">Local Playback Web Interface</a></li>';
}
and so when the page first loads, if the MPD daemon is not running the link to the web interface is pointed to a page that explains MPD is not enabled. This link does NOT contain the target="_blank" attribute. However, if one navigates to the settings form and switches on MPD, there is logic to replace the href and target attributes of that particular link, so theoretically all should work as if the page had loaded initially with the MPD flag on (if that is clear!). The problem is that when the "replaced" link with target="_blank" (set by .prop() or .attr(), I've tried both and it doesn't seem to make a difference) is clicked, the page still loads inside the div!I tried duplicating the click handler that's defined within $().ready and putting it in another function which I call after the link attributes are set, but it still doesn't work as I imagine it should! Just to verify that I wasn't crazy, I used .each() to print all the links that did and did not have the target="_blank" attribute and that all corresponds to what I believe it should be. Why is the replaced link not getting treated as if it has a target="_blank" attribute in the click handler? By the way, Going the other way and removing the target="_blank" attribute if MPD is turned off, works like a charm. Thanks so much in advance for any answers, and my apologies if I have duplicated a previous question!
Cheers,

Events are always tricky anytime you have to reload elements with ajax. The best way I've found is to attach the event to some container element that will not reload:
$('#always_present_container').on('click', "nav.setup-nav a", function (event){
if($(this).attr('target') != '_blank'){
...
}
});
that way the element is checked for the attribute when its container is clicked. When you set up $('element').click() the selector is checked on the page load and the events attached then, so when you reload something via ajax the new element doesn't get this event attached.
Note: normally you could avoid the conditional statement in the function, but I didn't know of an easy way to filter by target in a css selector.

loadmask in sencha touch2

I want apply load-mask in view page. while launching the application, some view pages are taking time to load data later it will display, so if its taking time to load in that time i want show load-mask to users with some messages like "loading....". from some sample i have applied load-mask, but it is shows that message every time whenever i hit that page. this is bad way because here setting time. i need apply load-mask like this if don't have data it should show the load-mask to the user, until page getting the data. please any one help me. how to achieve this one
My code is here: at controller level i am taking the id of load-mask and setting the property as shown below code
onCompanyPageLoad: function () {
var loader = Ext.getCmp('mask');
loader.setMessage("Loading...");
loader.setIndicator(true);
loader.setTransparent(false);
loader.show();
setTimeout(function () {
loader.hide();
}, 1000);
}

The answer of user978790 is formal way to show and hide a loading mask in Sencha Touch 2.
If you can't make it work, it's very likely that you're doing something like:
Ext.Viewport.setMasked({xtype:'loadmask',message:'your custom loadmask'});
... then do something here
Ext.Viewport.setMasked(false);
Note that Javascript is asynchronous, so it does NOT make sure that the code lines are run in above order. Then there is a possibily that Sencha Touch initializes your loading mask and destroys it right then. In order to use loading mask correctly:
Initialize a loading mask as above.
Put the Ext.Viewport.setMasked(false); in special functions which are ensured to be launched after loading mask initialization, eg. event handler, or success function of your JSONP/AJAX request.

I do it the following way:
Ext.Viewport.setMasked({xtype:'loadmask',message:'your custom loadmask'});
Then you can use
Ext.Viewport.setMasked(false);
To stop showing a loading mask
This also works on components if you only want to show a mask on part of a view

Just remove all this.I have nice idea how to use loader.First on main page html just add loader
<div id="loader"></div>//add id#loader with background loading image
after your page loads just add on contoller Ext.get('loader').destroy();//when you page full load then it will load your loading div

Preloader does not preload and loads the page a second time

I found this nice jQuery preloader/progress bar, but I cannot get it to work as it is supposed to. The problem is that it first loads my page and after my whole page is loaded the 0%-100% bar displays quickly, after that it reloads my page again. So it does not show the progress bar BEFORE the page loads and it loads the page a second time as well.
Here is my implementation code:
<head>
<script src="js/jquery-1.7.2.min.js" type="text/javascript"></script>
<script src="js/jquery.queryloader2.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$("body").queryLoader2();
});
</script>
</head>
<body>
My content...No other reference in here for the Jquery preloader
</body>
Thanks for any help in advance.

I could be very, very wrong here, but in my opinion:
The plugin is flawed.
You have some issue in your page that causes a redirect.
I have created a test fiddle and found out the following:
If there are no images on the page, then the plugin's private function completeImageLoading(); is never called because it is only bound to the image elements. When there are no images -> there's no binding -> no triggering -> nothing completes -> you stay with overlay 0% as demonstrated by the fiddle that is NOT RUN (jsfiddle doesn't see relative images when the page is not run).
The plugin doesn't take into consideration remote images. So if you declare them like so <img src="http://example.com/image.jpg"> - then it won't work because the plugin doesn't recognize them. In fact it is using $.ajax to load images which, obviously, generates a error when trying to access another domain.
The plugin doesn't reload the page (at least in Google Chrome)... check your console output while in the fiddle. It displays the message once per click on Run.
Suggestions:
Make sure you provide at least one relative or background image (though I haven't tested backgrounds...) for the plugin to work.
Show us more code. The fiddle demonstrates that the plugin does NOT cause page reload (at least in Chrome... are you using another browser?). It must be something you made that interferes here.
Specify some options for the plugin (behaves weird when there are none).
Edit regarding preloader
Regarding preloader... if displaying progress is not mandatory for you, then you can just use a window.onload trick. On DOM ready $(...) you create an opaque page overlay with a "Please wait..." message and some animation if you fancy it. Then you wait for window.onload event which "fires at the end of the document loading process... when all of the objects in the document are in the DOM, and all the images and sub-frames have finished loading." When window.onload triggers, you just remove your overlay and voila - the page is ready!
Edit 2 regarding preloader
Actually, you don't even need $(...)... what the hell was I thinking? Just create your overlay (a simple div with a unique id) in your html, style it so that it fills the screen and give it a z-index:1337 CSS attribute so that it covers the entire page. Then, on window.onload:
window.onload = function () {
// Grab a reference to your overlay element:
var overlay = document.getElementById('myOverlay');
// Check if the overlay really exists
// and if it is really appended to the DOM,
// because if not - removeChild throws an error
if (overlay && overlay.parentNode && overlay.parentNode.nodeType === 1) {
// Remove overlay from DOM:
overlay.parentNode.removeChild(overlay);
// Now trash it to free some resources:
overlay = null;
}
};
Of course, it's not really a preloader, but simply an imitation.
Here's a working fiddle you can play with.
P.S. I personally don't appreciate preloaders, but that's just me...

Try out this(Remove the document.ready event and simply call this):-
<script type="text/javascript">
$("body").queryLoader2();
</script>

Check if the webpage has been modified

I am working on chrome extension for facebook. If you use facebook, you know that when you scroll down to the bottom of the news feed/timeline/profile it shows more posts. The extension actually adds a button beside the "like" button. So I need to check if there are more posts to add that button to.
Right now to check if the page has been modified, I use setInterval(function(){},2000).
I want to run a function when the user clicks the button. But this function doesn't work if I put it outside (or even inside) setInterval() – The Koder just now edit
How can I check if the webpage has been modified WITHOUT using a loop?
Example:
$(document).ready(function(){
window.setInterval(function(){
$(".UIActionLinks").find(".dot").css('display','none');
$(".UIActionLinks").find(".taheles_link").css('display','none');
$(".miniActionList").find(".dot").css('display','none');
$(".miniActionList").find(".taheles_link").css('display','none');
//only this function doesn't work:
$(".taheles_link").click(function(){
$(".taheles_default_message").hide();
$(".taheles_saving_message").show();
});
//end
$(".like_link").after('<span class="dot"> · </span><button class="taheles_link stat_elem as_link" title="תגיד תכל´ס" type="submit" name="taheles" onclick="apply_taheles()" data-ft="{"tn":">","type":22}"><span class="taheles_default_message">תכל´ס</span><span class="taheles_saving_message">לא תכלס</span></button>');
$(".taheles_saving_message").hide();
}, 2000);
});
In the future, this extension will use AJAX, so setInterval() can make even more problems for me.

If I understand correctly you want to get a notification when the page's DOM changes. And you want to do this without using the setInterval() function.
As your problem lies within the attaching event handlers to elements that are created after the page has loaded, you might be interested in checking out the jquery.live event attachment technique. I think it will solve your issue.
In general you want the page to throw a mutation event. There is a mutation event spec that might be what you're looking for. Here are some links that might be useful.
http://tobiasz123.wordpress.com/2009/01/19/utilizing-mutation-events-for-automatic-and-persistent-event-attaching/
Detect element content changes with jQuery

$(document).ready(function(){
setInterval('fun()',5000);
fun();
});
function fun()
{
alert(11)
}