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Is it arriving the javascript later than the html?

I'm trying to change the size of a pop-up and give it the same width than the screen, sent from an iframe.
var screen_width = parent.screen.width;
Then I got the html:
<a href="#" onClick="window.open('https://www.google.com','popup', 'width='"+screen_width+"',height=400px')">
I've tryed all possible convinations with the ' " or whatever I know, but I think it should work lie this.
Sorry if it's obvious, my coding skills are not so developed, but I think, it's possible, html it's loading before javascript?
P.D.: One more thing, I want to use a variable, because I want to change a bit the real size of the screen.

One problem you might be having is that in your window.open() options, you shouldn't specify px... just put the number for your height.
In any case, here's a better implementation of what you're trying to do. In your HTML:
<a href="http://example.com" target="_blank" data-fullpopup>Click me!</a>
This way, your link will work, and will even open in a new tab/window if your JavaScript doesn't run for some reason. This is a good fallback. The key here is the data-fullpopup attribute, which we'll look for in your JavaScript:
document.addEventListener('DOMContentLoaded', (e) => {
document.querySelector('body').addEventListener('click', (e) => {
if (!e.target.matches('a[data-fullpopup]')) {
return;
}
window.open(e.target.href, 'popup', 'width=' + window.screen.width + ',height=400');
e.preventDefault();
});
});
Basically, we wait for the document to fully load so that we can attach a click handler to the body element. (Note: If you're only doing this for a couple links, it's better to attach the click handler directly to them. I'm attaching it to body here, assuming that you'll have a lot of these sorts of links... it's more efficient to have one click handler in those cases. Remember though that then this click handler has to run for every click for any element on the page. Choose your tradeoff for your use case.)
Once the link is clicked, we confirm that it's a link with our data-fullpopup attribute. If it is, we treat it like a full-width popup. We get the target (the element) href on the fly, as well as the current screen width. Finally, we prevent the default action so that it also doesn't navigate to the page on its own.
https://jsfiddle.net/L5p0xk98/3/

As mentioned in the comments, you can do this without setting a variable first:
Click Me

Open href link in popup

I'm trying to open the link in popup, i've write this static html code :
<a href="http://www.google.com" target="popup"
onclick="window.open('http://www.google.com','popup','width=600,height=600');
return false;"> Open Link in Popup
</a>
this code works, it open the link in popup.
But, if i want to add this code in javascript (with jquery) like this :
$('#services').append("<li><a href='http://www.google.com' target='popup' onclick='window.open('http://www.google.com','popup','width=600,height=600'); return false;'>Open Link in Popup</a></li>");
The link is opened in new tab and not in popup.
Why ?

Check this example on jsfiddle - Problem is in quotes
$('#services').append("<a href='http://www.google.com' target='popup' onclick=window.open('http://www.google.com','popup','width=600,height=600'); return false;>Open Link in Popup</a>");

You missed to escape the quotes in onClick of your jQuery. Update the script as below.
$('#services').append("<li>Open Link in Popup</li>");

Change your algorithm, instead of putting the javascript inside onclick, add a class or ID, with data-, so you can attach your jQuery event handler on that class/ID, and use the data to create new window. Imagine the data as data-destination="http://www.destination".
That should fix your problem.

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.

Javascript & CGI How to open div and pass arguments in same time

I have to change my code a little bit to add jquery popup window.
So far I just open new window using:
<a href="?action=_edit&_code=code"><img src...
In new version I simply open popup window using:
<a href="#myDialog" data-toggle="modal" onclick="">...
It works in terms of open dialog box, the only problem remains is how to pass arguments from ?action=_edit&_code=code in this case ?
Thanks for help ;)

You can use more data tags, for example, data-action, and data-code. These can then be obtained in your on click handler.
This link here might give you a better idea: http://www.slideshare.net/lensco/html5-data-attributes

how to prevent popup javascript onclick event

i have link
<a onclick="return package_tour_order(14400287396);" href="javascript:;">advanced</a>
<a>doit</a>
need to get value from onclick only ID nubmer, but this
return package_tour_order(14400287396) is javascript function that popup new window with informationabout that ID
if i run this code
$('a:contains("advanced")').attr('onclick').match(/\d+(?=\))/)[0]
it works fine but when i run in my project with that javascript function(this function is loaded from another site) its does not work and popup window
i need to disable onclick somehow and get only that ID number, how can i doo that?

Don't make it a link. Make it a span or whatever. Also... what do you mean by "function is loaded from another site". If the script is loaded that should not influence things.