Скачать или смотреть How to Change img src with JavaScript

Discover how to effectively use JavaScript to change ` img src ` attributes. Learn key concepts and best practices for modifying image sources in your web projects!
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This video is based on the question https://stackoverflow.com/q/70050030/ asked by the user 'HorseBob' ( https://stackoverflow.com/u/15669343/ ) and on the answer https://stackoverflow.com/a/70050221/ provided by the user 'Lucas Mesquita' ( https://stackoverflow.com/u/16021215/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Change <img src> with JavaScript: A Beginner's Guide

JavaScript is a powerful tool for web development, allowing developers to create dynamic and interactive user experiences. One common task is changing the source of an image (<img src>) when users interact with elements on a webpage, such as clicking a button. This guide will walk you through the process of changing an image source using JavaScript, using an example regarding a music icon toggle.

The Problem: Toggling an Image Source

Let's say you want to create a simple functionality where clicking on a button plays music and changes an associated music icon. The function you've written is designed to toggle between two SVG icons—musicOff and musicOn—but it's not working as expected on the second click. Instead of changing the icon, nothing happens.

Understanding the Code Structure

Your current setup consists of JavaScript, HTML, and CSS. Here’s a breakdown of the existing code:

JavaScript:

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HTML:

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CSS:

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Identifying the Issues

Comparison Error: In your if condition, you are using a single equals sign (=) instead of a double equals sign (==) for comparison.

Absolute Path Problem: The property audioState.src will return the absolute path to the image source instead of the relative path. This can cause issues during comparison.

Updating the <img> Source: You are currently assigning a new source to the image using audioState.src, which can lead to further complications without proper procedures.

The Solution: Implementing the Fixes

Step 1: Use the Correct Comparison Operator

Change the assignment operator (=) in your if condition to the equality operators (== or ===). Here’s how to correctly check the image source:

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Step 2: Retrieve and Set Image Path Correctly

Instead of using audioState.src, use getAttribute('src') to retrieve the current source of the image, and setAttribute('src', 'newPath') to change it:

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Final Code Implementation

Here’s how your complete JavaScript function should look after these adjustments:

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Conclusion

By ensuring that you use the proper comparison and update methods, you can effectively change the source of an image when a user interacts with a button. This small adjustment makes a world of difference in how your JavaScript interactions behave, leading to a more engaging experience.

Feel free to reach out if you have further questions or need assistance with other JavaScript topics!