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Learn the right way to pass variables into HTML and embed URLs. Say goodbye to 404 errors with our step-by-step guide!
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This video is based on the question https://stackoverflow.com/q/62527138/ asked by the user 'user4500293' ( https://stackoverflow.com/u/4500293/ ) and on the answer https://stackoverflow.com/a/62527217/ provided by the user 'Marik Ishtar' ( https://stackoverflow.com/u/10564525/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Pass a Variable to an HTML Embedded URL Correctly

Embedding URLs in HTML can sometimes lead to frustrating errors, especially when you're trying to pass a variable dynamically from your JavaScript or backend framework like Flask. If you’ve encountered the infamous “404 Page Not Found” error while attempting to implement this, you’re not alone. This guide will guide you through the common pitfalls and provide you with a clear solution to passing variables and embedding them in an HTML iframe correctly.

The Problem

You want a seamless way to build a URL using a variable in your application and display it in an iframe. However, after trying to implement this, you're suddenly faced with an error, leaving you scratching your head. Here's an example of some code that might look familiar:

[[See Video to Reveal this Text or Code Snippet]]

Issues Encountered

The code snippet shown displays a few mistakes that lead to the 404 error:

Incorrect ID Assignment:

id=my_url should use quotes, like id="my_url".

Wrong src Value:

You cannot set src to a function call (myFunction()). It needs to point directly to a URL.

Spacing Mistakes:

The retrieval of the element should be done precisely, i.e., document.getElementById("my_url") (note there shouldn’t be an extra space).

Missing Protocol in URL:

When setting a URL, ensure to include the protocol (http:// or https://) to avoid resolving issues.

The Solution

We need to rectify the mistakes from the code above to allow it to execute correctly. Below is the corrected version that demonstrates how to properly set the src attribute of the iframe using JavaScript.

[[See Video to Reveal this Text or Code Snippet]]

Key Changes Made

Adding Quotes for ID: The iframe's id is now properly quoted as id="my_url".

Setting src Correctly: We're directly assigning a valid URL including the https:// prefix.

Calling the Function Immediately: The function myFunction() is called immediately to set the iframe’s source as soon as the script runs.

Conclusion

By adhering to the simple guidelines outlined above, you can successfully pass a variable to an HTML embedded URL without stumbling into common errors that cause 404 issues. This approach will not only enhance usability but will also ensure that your application functions as intended. Happy coding!