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Discover a simple solution to obtain the *rendered height* of an image after it loads, enabling you to position captions correctly in your web design.
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This video is based on the question https://stackoverflow.com/q/72221783/ asked by the user 'LauraNMS' ( https://stackoverflow.com/u/1229001/ ) and on the answer https://stackoverflow.com/a/72223239/ provided by the user 'Dan Sherwin' ( https://stackoverflow.com/u/2453393/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Get the Rendered Height of an Enlarged Image in jQuery

When working with images on a webpage, you may run into a common challenge: how to adjust the layout dynamically based on the image size. This is particularly important when you're enlarging an image and need to position elements, such as captions, accurately beneath it. In this guide, we will explore how to handle a situation where the height of an image is returning as zero when you try to extract it before the image has fully loaded.

The Problem

Imagine you have a simple image and when clicked, it enlarges in a popup. You also want a caption placed right below the enlarged image. However, when you query the height of the enlarged image using jQuery ($('.popup img').height()), it returns 0. This is because the image is being loaded asynchronously, meaning it hasn't finished loading by the time you check its dimensions.

The Solution

Rather than trying to calculate the height of the image before it's fully rendered, there's a simpler solution. You can adjust your CSS and jQuery code slightly to eliminate the need to measure the image height. Here’s how:

Step 1: Modify Your CSS

Change the positioning of the image and caption to relative. This way, they will flow naturally together, so the caption will always stay below the image regardless of its size.

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

Step 2: Update Your jQuery Code

Next, modify your jQuery code to simplify the image and caption assignment, removing the line that attempts to fetch the height:

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

Full Example

Now, let’s take a look at the complete example of the HTML, CSS, and jQuery combined. This will provide you with an effective way to implement the changes:

HTML

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

CSS

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

jQuery

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

Conclusion

With these changes, your caption will always sit perfectly below the enlarged image, regardless of its rendered height. This simple solution streamlines the process, fixing the issue of the height returning as zero. Now, you can enhance the user experience on your website with well-placed captions and content!

Feel free to try it out, customize the styles, and make it your own!