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Learn how to dynamically resize two images using JavaScript and a range input, creating an interactive user experience on your website.
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This video is based on the question https://stackoverflow.com/q/67008559/ asked by the user 'Markos' ( https://stackoverflow.com/u/14831589/ ) and on the answer https://stackoverflow.com/a/67008754/ provided by the user 'LuisAFK' ( https://stackoverflow.com/u/15584743/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Resize Two Images Dynamically with JavaScript Using a Range Input

In the world of web development, interactivity is key to engaging users. One interesting task can be resizing images dynamically using a range input. This not only makes your content livelier, but also allows users to control what they see. In this guide, we'll address a common challenge: adjusting two images' widths using a simple slider. Let's dive into how to achieve this using JavaScript.

Understanding the Problem

The original goal is straightforward: you want two images placed side by side on your webpage. Using an <input type="range">, when you adjust the slider, one image should resize larger while the other shrinks correspondingly. For instance, if the left image is set to 100% width, the right image should automatically adjust to 40%. However, the initial implementation only modified one image's width, leaving the other unchanged.

Solution Overview

To resolve the issue, we need to manipulate both images simultaneously based on the slider's value. Here's a comprehensive breakdown of how to set up your HTML structure, CSS styles for organization, and the JavaScript needed to create the desired interactions.

Step 1: HTML Structure

Here’s a minimal HTML setup for two images and a slider:

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

Step 2: CSS Styles

For styling, we can keep it simple with the following CSS to ensure images are properly aligned and responsive:

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

Step 3: JavaScript Logic

Now, it’s time to add the functionality with JavaScript. The oninput event of the slider is key here, as it will update both images’ widths appropriately:

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

How the Logic Works

Setting the Widths: We adjust the left image's width based on the slider's value.

Calculating the Right Image's Width: The right image’s width is calculated to ensure that the total combined widths don’t exceed 100%.

Updating the Display: Both images' demo text updates dynamically to reflect their current width percentages.

Conclusion

Now you have a fully functioning setup where adjusting the slider will seamlessly resize two images, creating an interactive user experience. Whether you're building an image gallery or a demo interface, this technique can enhance your web pages significantly. Happy coding!