How can I easily retrieve the current URL from an embedded iframe?
The user will be navigating through various web pages. I assume that some JavaScript code would be needed for this task.
How can I easily retrieve the current URL from an embedded iframe?
The user will be navigating through various web pages. I assume that some JavaScript code would be needed for this task.
To ensure maximum security measures, the URL can only be accessed if both the iframe contents and referencing JavaScript are served from the same domain. In such cases, you can use the following code snippet to retrieve the URL:
document.getElementById("iframe_id").contentWindow.location.href
If there is a mismatch between the two domains, you will encounter restrictions due to cross-site reference scripting security protocols.
For more information, you can refer to similar question responses on Stack Overflow.
In the case that your iframe is sourced from a different domain (cross-domain), the previously provided solutions may not be applicable. In such situations, you can retrieve the main URL using this code snippet:
var currentUrl = document.referrer;
This will give you access to the primary URL.
Dealing with blob URL hrefs was a bit tricky for me. To tackle this issue, I decided to create a URL based on the src attribute of an iframe:
const iframeRef = document.getElementById("iframe_id");
const iframeSrcUrl = iframeRef ? new URL(iframeRef.src) : undefined;
if (iframeSrcUrl) {
console.log("Success: " + iframeSrcUrl);
} else {
console.warn("Could not find iframe with ID 'iframe_id'");
}
When working within an iframe context,
You have the option to:
const currentIframeHref = new URL(document.location.href);
const urlOrigin = currentIframeHref.origin;
const urlFilePath = decodeURIComponent(currentIframeHref.pathname);
If you are in the parent window/frame, you can refer to for guidance. Simply use the following code snippet:
document.getElementById("iframe_id").contentWindow.location.href
In the scenario where you are within an iframe lacking a cross-domain src or with an empty src, the following steps should be taken:
1. Create a function called getOriginUrl as follows:
function getOriginUrl() {
var href = document.location.href;
var referrer = document.referrer;
// Check if window.frameElement is not null
if(window.frameElement) {
href = window.frameElement.ownerDocument.location.href;
// Set referrer as origin if it is not empty
if(window.frameElement.ownerDocument.referrer != "") {
referrer = window.frameElement.ownerDocument.referrer;
}
}
// Compare href to referrer and determine which one to return
if(href != referrer) {
return referrer; // Take referrer as origin
} else {
return href; // Take href as origin
}
}
If you find yourself inside an iframe with a cross-domain src, then follow these instructions:
2. Implement a function named getOriginUrl like this:
function getOriginUrl() {
var href = document.location.href;
var referrer = document.referrer;
// Detect if the current window is within an iframe
if(window.parent != window) {
return referrer; // Take referrer as origin
} else {
return href; // Take href as origin
}
}
If you're facing a similar issue, I found a solution that worked for me. I encountered the same problem before and resolved it by using localstorage to exchange data between the parent window and iframe. Here's what you can do in the parent window:
localStorage.setItem("url", myUrl);
In the code where the iframe source is set, simply retrieve this data from localstorage:
localStorage.getItem('url');
This method saved me a significant amount of time. It seems like the only requirement is having access to the parent page's code. Hopefully, this information proves useful to someone.
In my quest to extract the complete URL from within the Shopify Google Analytics additional script iframe, I discovered that document.refferer only displays the hostname without any search parameters. However, I stumbled upon another property that solved my problem - document.baseURI
If you're facing difficulties with retrieving URL from an iframe, here's some useful information:
You may encounter null values if you're trying to access the URL before the iframe has fully loaded. One solution to this issue is to dynamically create the entire iframe using JavaScript and retrieve the necessary values using the onLoad function:
var iframe = document.createElement('iframe');
iframe.onload = function() {
// custom settings
this.width=screen.width;this.height=screen.height; this.passing=0; this.frameBorder="0";
var href = iframe.contentWindow.location.href;
var origin = iframe.contentWindow.location.origin;
var url = iframe.contentWindow.location.url;
var path = iframe.contentWindow.location.pathname;
console.log("href: ", href)
console.log("origin: ", origin)
console.log("path: ", path)
console.log("url: ", url)
};
iframe.src = 'http://localhost/folder/index.html';
document.body.appendChild(iframe);
Due to the same-origin policy, accessing "cross-origin" frames can pose challenges - which can be resolved by running a local web server instead of directly opening files from your disk. It's essential to ensure that the protocol, hostname, and port of the iframe match the origin for everything to function correctly. If you face issues while running all files from your disk, it might be due to missing one or more of these parameters.
For further insights on location objects, refer to: https://www.w3schools.com/JSREF/obj_location.asp
It may not be a straightforward process, but it's also not overly complicated. Simply run the command
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