What is the most effective approach for HTML with two iframes placed horizontally, where the left one serves as a sidebar containing links that will open other HTML pages on the right iframe upon clicking them?
Something similar to this: https://i.stack.imgur.com/opSni.png
Suppose you have full control over all the content, or at least control over the menu. In that case, you can achieve this by utilizing the postMessage function.
window.top) when a link is clicked,data property,However, regarding best practices, there isn't a specific one for the use case you described. It is generally recommended to avoid it if possible.
To put it simply, iframes add unnecessary complications and are best avoided. They often result in limitations and problems down the line. A more detailed explanation supporting this notion can be found here: Why the Iframe is Evil.
Since all your content resides on the same server, I suggest considering AJAX practices to load the content directly into the HTML page. This approach offers several advantages:
An easy way to experiment with this idea is by using jQuery and its load() function. I have created a codepen example that demonstrates the code you can try on your project. Note that it won't work in codepen as the code window is at s.codepen.io and the linked pages are in codepen.io. Due to the access-control-allow-origin policy, the browser prevents loading anything.
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