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Dynamic iframe contents returns source, not parsed code

First question, so please correct me if this is in the wrong format.
I need to retrieve html for two dynamic elements from a dynamically created iframe, the below code returns "undefined". But I'm probably missing something really obvious.
$("#frame0").contents().find(elementID).html();
I am loading a same domain page into an iframe, two elements in the iframe are created from its jquery, the rest is static content in the iframe. The iframe is created and appended on a button click. The iframe in page looks and loads perfectly.
Below is the relevant code from within my button click:
$("#frameWrapper").append($('<iframe id="frame0" src="' + url + '"/>'));
$("#frame0").bind("load",function(){
var html = $(this).contents().find('#content').html();
var data = $(this).contents().find(elementID).html();
var table = $(this).contents().find(elementID).parent().find("table").html();
console.log(html);
console.log(data);
console.log(table);
});
#frameWrapper is a dynamically added container in the current page.
#frame0 is the actual iframe.
Of the three console.logs in the above code, html always returns the source code which is not the same as the actual view in the iframe on the page, data and table are always undefined, they are the two dynamic elements.
If I remove .html() from the above code, then all three elements are found and returned in the console.log.
I have tried too many things to list, as many answers on here as I can find, including checking all the suggested ones while I was writing this. But some of the ideas include, using plain javascript and adding a timeout to ensure load has completed, always the same response.
EDIT: Added the basic iframe code:
<div id="content">
<div class="wrap">
<div id="elementID"></div>
<table class="table"></table>
</div>
</div>
#elementID and .table are empty in the source and are only populated via a jquery function on load.
EDIT2: jsfiddle obviously it's having issues with Cross-domain policy so it's not really a good example, but it is a start.

Use this:
$("#frameWrapper").on("load", "#frame0", function () {
var html = $(this).contents().find('#content').html();
var data = $(this).contents().find(elementID).html();
var table = $(this).contents().find(elementID).parent().find("table").html();
console.log(html);
console.log(data);
console.log(table);
});
...instead of $("#frame0").bind("load",function(){...
This is called delegated events and should be used since the iframe is dynamically generated.
I don't have a working code to test for your issue, therefore the above is my guess to resolve your problem.

jQuery parse HTML without loading images

I load HTML from other pages to extract and display data from that page:
$.get('http://example.org/205.html', function (html) {
console.log( $(html).find('#c1034') );
});
That does work but because of the $(html) my browser tries to load images that are linked in 205.html. Those images do not exist on my domain so I get a lot of 404 errors.
Is there a way to parse the page like $(html) but without loading the whole page into my browser?

Actually if you look in the jQuery documentation it says that you can pass the "owner document" as the second argument to $.
So what we can then do is create a virtual document so that the browser does not automatically load the images present in the supplied HTML:
var ownerDocument = document.implementation.createHTMLDocument('virtual');
$(html, ownerDocument).find('.some-selector');

Use regex and remove all <img> tags
html = html.replace(/<img[^>]*>/g,"");

Sorry for resuscitating an old question, but this is the first result when searching for how to try to stop parsed html from loading external assets.
I took Nik Ahmad Zainalddin's answer, however there is a weakness in it in that any elements in between <script> tags get wiped out.
<script>
</script>
Inert text
<script>
</script>
In the above example Inert text would be removed along with the script tags. I ended up doing the following instead:
html = html.replace(/<\s*(script|iframe)[^>]*>(?:[^<]*<)*?\/\1>/g, "").replace(/(<(\b(img|style|head|link)\b)(([^>]*\/>)|([^\7]*(<\/\2[^>]*>)))|(<\bimg\b)[^>]*>|(\b(background|style)\b=\s*"[^"]*"))/g, "");
Additionally I added the capability to remove iframes.
Hope this helps someone.

Using the following way to parse html will load images automatically.
var wrapper = document.createElement('div'),
html = '.....';
wrapper.innerHTML = html;
If use DomParser to parse html, the images will not be loaded automatically. See https://github.com/panzi/jQuery-Parse-HTML/blob/master/jquery.parsehtml.js for details.

You could either use jQuerys remove() method to select the image elements
console.log( $(html).find('img').remove().end().find('#c1034') );
or remove then from the HTML string. Something like
console.log( $(html.replace(/<img[^>]*>/g,"")) );
Regarding background images, you could do something like this:
$(html).filter(function() {
return $(this).css('background-image') !== '';
}).remove();

The following regex replace all occurance of <head>, <link>, <script>, <style>, including background and style attribute from data string returned by ajax load.
html = html.replace(/(<(\b(img|style|script|head|link)\b)(([^>]*\/>)|([^\7]*(<\/\2[^>]*>)))|(<\bimg\b)[^>]*>|(\b(background|style)\b=\s*"[^"]*"))/g,"");
Test regex: https://regex101.com/r/nB1oP5/1
I wish there is a a better way to work around (other than using regex replace).

Instead of removing all img elements altogether, you can use the following regex to delete all src attributes instead:
html = html.replace(/src="[^"]*"/ig, "");

Find body tag in an ajax HTML response

I'm making an ajax call to fetch content and append this content like this:
$(function(){
var site = $('input').val();
$.get('file.php', { site:site }, function(data){
mas = $(data).find('a');
mas.map(function(elem, index) {
divs = $(this).html();
$('#result').append('' + divs + '');
})
}, 'html');
});
The problem is that when I change a in body I get nothing (no error, just no html). Im assuming body is a tag just like 'a' is? What am I doing wrong?
So this works for me:
mas = $(data).find('a');
But this doesn't:
mas = $(data).find('body');

I ended up with this simple solution:
var body = data.substring(data.indexOf("<body>")+6,data.indexOf("</body>"));
$('body').html(body);
Works also with head or any other tag.
(A solution with xml parsing would be nicer but with an invalid XML response you have to do some "string parsing".)

Parsing the returned HTML through a jQuery object (i.e $(data)) in order to get the body tag is doomed to fail, I'm afraid.
The reason is that the returned data is a string (try console.log(typeof(data))). Now, according to the jQuery documentation, when creating a jQuery object from a string containing complex HTML markup, tags such as body are likely to get stripped. This happens since in order to create the object, the HTML markup is actually inserted into the DOM which cannot allow such additional tags.
Relevant quote from the documentation:
If a string is passed as the parameter to $(), jQuery examines the string to see if it looks like HTML.
[...]
If the HTML is more complex than a single tag without attributes, as it is in the above example, the actual creation of the elements is handled by the browser's innerHTML mechanism. In most cases, jQuery creates a new element and sets the innerHTML property of the element to the HTML snippet that was passed in. When the parameter has a single tag (with optional closing tag or quick-closing) — $( "< img / >" ) or $( "< img >" ), $( "< a >< /a >" ) or $( "< a >" ) — jQuery creates the element using the native JavaScript createElement() function.
When passing in complex HTML, some browsers may not generate a DOM
that exactly replicates the HTML source provided. As mentioned, jQuery
uses the browser"s .innerHTML property to parse the passed HTML and
insert it into the current document. During this process, some
browsers filter out certain elements such as < html >, < title >, or
< head > elements. As a result, the elements inserted may not be
representative of the original string passed.

I experimented a little, and have identified the cause to a point, so pending a real answer which I would be interested in, here is a hack to help understand the issue
$.get('/',function(d){
// replace the `HTML` tags with `NOTHTML` tags
// and the `BODY` tags with `NOTBODY` tags
d = d.replace(/(<\/?)html( .+?)?>/gi,'$1NOTHTML$2>',d)
d = d.replace(/(<\/?)body( .+?)?>/gi,'$1NOTBODY$2>',d)
// select the `notbody` tag and log for testing
console.log($(d).find('notbody').html())
})
Edit: further experimentation
It seems it is possible if you load the content into an iframe, then you can access the frame content through some dom object hierarchy...
// get a page using AJAX
$.get('/',function(d){
// create a temporary `iframe`, make it hidden, and attach to the DOM
var frame = $('<iframe id="frame" src="/" style="display: none;"></iframe>').appendTo('body')
// check that the frame has loaded content
$(frame).load(function(){
// grab the HTML from the body, using the raw DOM node (frame[0])
// and more specifically, it's `contentDocument` property
var html = $('body',frame[0].contentDocument).html()
// check the HTML
console.log(html)
// remove the temporary iframe
$("#frame").remove()
})
})
Edit: more research
It seems that contentDocument is the standards compliant way to get hold of the window.document element of an iFrame, but of course IE don't really care for standards, so this is how to get a reference to the iFrame's window.document.body object in a cross platform way...
var iframeDoc = iframe.contentDocument || iframe.contentWindow.document;
var iframeBody = iframeDoc.body;
// or for extra caution, to support even more obsolete browsers
// var iframeBody = iframeDoc.getElementsByTagName("body")[0]
See: contentDocument for an iframe

I FIGURED OUT SOMETHING WONDERFUL (I think!)
Got your html as a string?
var results = //probably an ajax response
Here's a jquery object that will work exactly like the elements currently attached to the DOM:
var superConvenient = $($.parseXML(response)).children('html');
Nothing will be stripped from superConvenient! You can do stuff like superConvenient.find('body') or even
superConvenient.find('head > script');
superConvenient works exactly like the jquery elements everyone is used to!!!!
NOTE
In this case the string results needs to be valid XML because it is fed to JQuery's parseXML method. A common feature of an HTML response may be a <!DOCTYPE> tag, which would invalidate the document in this sense. <!DOCTYPE> tags may need to be stripped before using this approach! Also watch out for features such as <!--[if IE 8]>...<![endif]-->, tags without closing tags, e.g.:
<ul>
<li>content...
<li>content...
<li>content...
</ul>
... and any other features of HTML that will be interpreted leniently by browsers, but will crash the XML parser.

Regex solution that worked for me:
var head = res.match(/<head.*?>.*?<\/head.*?>/s);
var body = res.match(/<body.*?>.*?<\/body.*?>/s);
Detailed explanation: https://regex101.com/r/kFkNeI/1

Most secure javascript JSON Inline technique

I'm using varnish+esi to return external json content from a RESTFul API.
This technique allows me to manage request and refresh data without using webserver resources for each request.
e.g:
<head>
....
<script>
var data = <esi:include src='apiurl/data'>;
</script>
...
After include the esi varnish will return:
var data = {attr:1, attr2:'martin'};
This works fine, but if the API returns an error, this technique will generate a parse error.
var data = <html><head><script>...api js here...</script></head><body><h1 ... api html ....
I solved this problem using a hidden div to parse and catch the error:
...
<b id=esi-data style=display:none;><esi:include src='apiurl/data'></b>
<script>
try{
var data = $.parseJSON($('#esi-data').html());
}catch{ alert('manage the error here');}
....
I've also tried using a script type text/esi, but the browser renders the html inside the script tag (wtf), e.g:
<script id=esi-data type='text/esi'><esi:include src='apiurl/data'></script>
Question:
Is there any why to wrap the tag and avoid the browser parse it ?

Let me expand upon the iframe suggestion I made in my comment—it's not quite what you think!
The approach is almost exactly the same as what you're doing already, but instead of using a normal HTML element like a div, you use an iframe.
<iframe id="esi-data" src="about:blank"><esi:include src="apiurl/data"></iframe>
var $iframe = $('#esi-data');
try {
var data = $.parseJSON($iframe.html());
} catch (e) { ... }
$iframe.remove();
#esi-data { display: none; }
How is this any different from your solution? Two ways:
The data/error page are truly hidden from your visitors. An iframe has an embedded content model, meaning that any content within the <iframe>…</iframe> tags gets completely replaced in the DOM—but you can still retrieve the original content using innerHTML.
It's valid HTML5… sort-of. In HTML5, markup inside iframe elements is treated as text. Sure, you're meant to be able to parse it as a fragment, and it's meant to contain only phrasing content (and no script elements!), but it's essentially just treated as text by the validator—and by browsers.
Scripts from the error page won't run. The content gets parsed as text and replaced in the DOM with another document—no chance for any script elements to be processed.
Take a look at it in action. If you comment out the line where I remove the iframe element and inspect the DOM, you can confirm that the HTML content is being replaced with an empty document. Also note that the embedded script tag never runs.
Important: this approach could still break if the third party added an iframe element into their error page for some reason. Unlikely as this may be, you can bulletproof the approach a little more by combining your technique with this one: surround the iframe with a hidden div that you remove when you're finished parsing.

Here I go with another attempt.
Although I believe you already have the possibly best solution for this, I could only imagine that you work around it with a fairly low-performance method of calling esi:insert in a separate HTML window, then retrieve the contents as if you were using AJAX on the server. Perhaps similar to this? Then check the contents you retrieved, maybe by using json_decode and on success generate an error JSON string.
The greatest downside I see to this is that I believe this would be very consuming and most likely even delays your requests as the separate page is called as if your server yourself was a client, parsed, then sent back.
I'd honestly stick to your current solution.

this is a rather tricky problem with no real elegant solution, if not with no solution at all
I asked you if it was an HTML(5) or XHTML(5) document, because in the later case a CDATA section can be used to wrap the content, changing slightly your solution to something like this :
...
<b id='esi-data' style='display:none;'>
<![CDATA[ <esi:include src='apiurl/data'> ]]>
</b>
<script>
try{
var data = $.parseJSON($('#esi-data').html());
}catch{ alert('manage the error here');}
....
Of crouse this solution works if :
you're using XHTML5 and
the error contains no CDATA section (because CDATA section nesting is impossible).
I don't know if switching from one serialization to the other is an option, but I wanted to clarify the intent of my question. It will hopefully help you out :).

Can't you simply change your API to return JSON { "error":"error_code_or_text" } on error? You can even do something meaningful in your interface to alert user about error if you do it that way.

<script>var data = 999;</script>
<script>
data = <esi:include src='apiurl/data'>;
</script>
<script>
if(data == 999) alert("there was an error");
</script>
If there is an error and "data" is not JSON, then a javascript error will be thrown. The next script block will pick that up.

How to append the HTML results of a URL call to the DOM?

I have a URL that resides on another domain, like this:
http://ads.adserver.com/ad?site=1233&zone=45435
When you type this URL in the browser, the result is HTML like this:
<img src="htt://ads.adserver.com/i/image.gif" border="0"/><br/>Test
The above renders as an image wrapped in a link with a second link below it.
I tried to capture this URL in a script tag and append it to the DOM, but it does not render the HTML above.
var ad_script = document.createElement('script');
ad_script.type = 'text/javascript';
ad_script.src = 'http://ads.adserver.com/ad?site=1233&zone=45435';
li.appendChild(ad_script);
Are there any other ways of invoking this URL and putting the result on the page? I can't use $.getScript() since I'm not invoking this in the global context. I need this HTML to appear exactly where I want it to appear.
EDIT: The only reason I am trying this route is that the third-party does not provide a JSON-P interface.
EDIT2: Unfortunately, I am not on an application server.
EDIT3: This is for iPhone.

You are limited to how you load this due to cross-domain issues .. an easy way would be to load the image in it's own iframe
<iframe src='http://ads.adserver.com/ad?site=1233&zone=45435' height='200px' width='200px' />

You'll want to use ajax for this. The easiest way might be jQuery's .load() method.
Assuming the element you want the content to go into has an id of holder, you would do
('#holder').load('http://ads.adserver.com/ad?site=1233&zone=45435')
It will put the contents of the webpage into your selected element. http://api.jquery.com/load/
edit: Sorry, forgot cross-site ajax limitations. You could instead set up a php page like:
if(isset($_GET['url'])){
echo file_get_contents($_GET['url'])
}
and then do
('#holder').load('http://yoursite.com/yourpage.php?url=http://ads.adserver.com/ad?site=1233&zone=45435')

Take the jsonp approach. use an actual script tag and put an executing javascript function as the response that adds that html markup to the dom. It will add it to the dom of the page where the script tag resides.

There are a number of jQuery ajax calls that can accomplish this, for example:
jQuery.get('http://ads.adserver.com/ad?site=1233&zone=45435', function(data){jQuery(updateElementQuery).html(data);});

Try to use jquery method 'load'
`$('#result').load(url, function(response) {
$('#my-li').append($('#result').html());
$('#result').html(null);
});`
... where #result is some hidden div