what's the purpose to set the parent location? - javascript

I have an iframe embedded in the page. Why we need to set the perent location Href from the iframe, any reason for that?
self.parent.location.href = blah blah blah;

That's usually a frame breaker technique.
Usually something like this:
if(self != top)top.location.href=someUrl;

As it's possible to put an iframe tag inside your page's body, you use top to manipulate the main window. See:
Main page
<!--This is the main page-->
<html>
<head>
<script>
alert(window.top.location.href);//The main page's URL
alert(window.self.location.href);//The main page's URL
alert(window.top.location.href);//The main page's URL
</script>
</head>
<body>
<iframe src="myFrame.html"></iframe>
</body>
</html>
myFrame.html
<html>
<head>
<script>
alert(window.location.href);//"myFrame.html"
alert(window.self.location.href);//"myFrame.html"
alert(window.top.location.href);//The main page's URL
</script>
</head>
<body>
</body>
</html>

Related

How to get reference to the iframe from which script html tag was generated?

I have small snippet that is inside iframe and generates script html tag and appends it to the window.top.document.head.
Now I want to know how do I check from within potato.js from which iframe it was generated from once it is already loaded?
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
<iframe>
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>
(function() {
var s = document.createElement('script');
s.setAttribute('type','text/javascript');
s.setAttribute('src','https://test.com/potato.js');
window.top.document.head.appendChild(s);
})();
</script>
</body>
</html>
</iframe>
</body>
</html>
Edit: I can not change this code inside the iframe
That information isn't stored automatically.
The only way I can think of would be to add an expando-prop to the script with a reference to the current window (i.e. the frame's window)…
s.sourceWindow = window;
… then read that from within potato.js …
const sourceWindow = document.currentScript.sourceWindow;
… and then loop over all the frames (window.frames) looking for a match.
Since you are using window.top and not window.parent you might need to be recursive there.

Iframe body when accessed through iframeElement.contentDocument.body is an empty node

I have a very simple setup on a dev server (both pages are on my local test server localhost:5500) where I have a main page
<!DOCTYPE html>
<html lang="en">
<head>
<title>Example Mockup</title>
</head>
<body>
<iframe src="./nested.html" id="frame"></iframe>
<script>
var iframe = document.getElementById('frame');
console.log(iframe.contentDocument.body);
</script>
</body>
</html>
and a nested page
<html>
<body>
<div id="hello">Hello, World</div>
</body>
</html>
when I load the main page in my browser the output written to console is: <body></body>
I can access the element #hello using iframe.contentDocument.getElementById('hello') but I want the body element including child elements. Can anyone please explain to me why is this happening
You have to wait until iframe loaded completely to access it's body.
var iframe = document.getElementById('frame');
iframe.onload = function () {
console.log(iframe.contentDocument.body);
}

How to access html elements in iframe inside html tag

I have a html file which contains iframe like below lines of code. Note that this iframe is displayed by one of tiny mce jquery and is rendered in browser as
below
<html>
<body>
<textarea id="texteditor"></textarea>
<div class="mceeditor">
<iframe>
<html>
<body>
<script type="text/javascript">
function mySubmit() {
var URL = "http://localhost:61222/14CommunityImages/hands.png";
window.document.getElementById("texteditor").value = URL;
}
</script>
</body>
</html>
</iframe>
</div>
</body>
</html>
Now my goal is to append var url inside text area which is in parent html tag.
Please help me !!!
The document in the iframe can access its parent window via parent, and its parent window's document via parent.document. So:
parent.document.getElementById("texteditor").value = URL;
Note: To access each-other's documents, the main document and the iframe must be on the same origin. If they're on different origins, they can still communicate, but only if they both do so expressly, via web messaging.
Side note: Your iframe, as shown in the question, won't work. Inline content in iframes is for display when the browser doesn't support iframes. You use a separate resource (e.g., page) identified by the src attribute (or you use the srcdoc attribute; I have no idea how well supported it is), for the iframe's content.
E.g.:
Main page:
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Main Page</title>
<body>
<textarea id="texteditor"></textarea>
<div class="mceeditor">
<iframe src="theframe.html"></iframe>
</div>
</body>
</html>
theframe.html:
<!doctype html>
<html>
<body>
<input type="button" value="Click to set" onclick="mySubmit()">
<script type="text/javascript">
function mySubmit() {
var URL = "http://localhost:61222/14CommunityImages/hands.png";
parent.document.getElementById("texteditor").value = URL;
}
</script>
</body>
</html>

JavaScript code in iframe

I need to run JavaScript code in iframe. But script with id "us" loaded after creating iframe. How to run this javascript in iframe?
<iframe id="preview">
#document
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script id="us" type="text/javascript">
$("#preview").ready(function() {
$(".test").click(function() {
alert(true);
});
});
</script>
</head>
<body>
<style></style>
<div class="test"></div>
</body>
</html>
</iframe>
Thanks in advance.
The IFrame has no access to what's outside of it. Everything inside IFrame is separate page ergo you threat it like so. So you do your document.ready in it.
Example: http://jsfiddle.net/ZTJUB/
// Since this is page you wait until it's loaded
$(function() {
$(".test").click(function() {
alert(true);
});
});
The jQuery instance inside of the iFrame doesn't know it's supposed to be traversing the parent DOM, so therefore it won't know where to look for an element with the id "preview"
As per my comments above, you should attach to the iframe's document.ready, like this:
// Since this is page you wait until it's loaded
$(document).ready(function() {
$(".test").click(function() {
alert(true);
});
});
EDIT:
Just realizing you are probably having an entirely different issue here - Html code as IFRAME source rather than a URL - if you are trying to embed the iframe code inline, you are going to have problems. Take the following code for example:
<html>
<head></head>
<body>
Some stuff here
<iframe id="preview">
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script id="us" type="text/javascript">
$(document).ready(function() {
$(".test").click(function() {
alert(true);
});
});
</script>
</head>
<body>
<style></style>
<div class="test">test</div>
</body>
</html>
</iframe>
</body>
</html>
if you render that page in firefox, and then inspect the source in firebug, you'll see:
<html>
<head></head>
<body>
Some stuff here
<iframe id="preview">
<html>
<head></head>
<body></body>
</html>
</iframe>
</body>
</html>
This is happening because the browser isn't expecting to see the code inline between the iframe tags.
Since you're not addressing the questions in the comments to better clarify what you are trying to do... I shall assume you are trying to access content IN your iframe FROM your parent page. Since the other answer should work fine if trying to run it from within the iframe.
On the parent page try something like:
$(function() {
$("#preview").load(function ()
$("#preview").contents().find(".test").click(function() {alert(true);});
});
});
*This assumes both parent and iframe are on the same domain.

How to access div id from next page in jquery mobile

page1.html
<!DOCTYPE html>
<html>
<head>
<script src="common_script.js"></script>
</head>
<body onload="init()">
<h1>My First Page</h1>
<p id="demo">This is a paragraph.</p>
</body>
</html>
page2.html
<!DOCTYPE html>
<html>
<head>
<script src="common_script.js"></script>
</head>
<body>
<h1>My second Page</h1>
<div id="nextpageId">I want to access my div</div>
</body>
</html>
common_script.js
function init() {
alert($("#nextpageId").text());
}
In the following code I have two pages i.e. page1.html & page2.html and these contain the common JavaScript file.
My problem is to access page2.html div#id when page1.html is loading.
use this in your javascript
$('body').attr('unique_id')
and give unique id for your page in body tag
<body id='unique_id'>
or you can also pass in url
or use this code
function init() {
alert( $('div').attr('id') == "nextpageId" )
}
You don't explicitly state that you are using jQuery Mobile but you have tagged your question as such and are using PhoneGap so I will assume so...
Your pages don't conform to a standard jQuery Mobile layout. They are missing the required data-roles. Specifically data-role="page" along with child data-role="content" declarations.
http://jquerymobile.com/demos/1.2.0/docs/pages/page-anatomy.html
Your second page will be loaded via Ajax and the <script> tag on the second page will be ignored. In fact, only the contents of the nested <div data-role="page"> section will be loaded.
To pull that markup, you can simply access the <div> given its ID and that ID should be unique. You can use the pageinit or pageshow events to control your timing on the Ajax load.
http://jquerymobile.com/demos/1.2.0/docs/api/events.html

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