Скачать или смотреть How to Fix event.target.getAttribute("src") Returning Null in JavaScript

Discover why `event.target.getAttribute("src")` returns null in JavaScript and learn how to effectively retrieve image sources on click events.
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This video is based on the question https://stackoverflow.com/q/76621522/ asked by the user 'J.C' ( https://stackoverflow.com/u/10152435/ ) and on the answer https://stackoverflow.com/a/76621539/ provided by the user 'Zachiah' ( https://stackoverflow.com/u/10892722/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Problem: Fetching Image Sources with JavaScript

If you've been working with JavaScript and HTML, you may have encountered a frustrating issue where the event.target.getAttribute("src") returns null. This problem can arise in scenarios where you're trying to retrieve the source of an image when a user clicks on a parent div. Let's examine a practical example to uncover what's happening, and then I’ll guide you through a solution.

You've created a list of images within clickable div elements, and when you click on these divs, you're ideally looking to get the full path of the image contained within. However, the direct approach to access the src attribute of the image can sometimes fail.

The HTML Structure

Here's a simplified version of the HTML code you're using:

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

When you click on one of these div elements, you're calling the show() function to retrieve the image source.

The Issue: event.target Misunderstanding

In your original JavaScript function:

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

The problem arises from how event.target is being utilized. The event.target refers to the specific element that is being clicked, which in this case is the div. Since the div does not have a src attribute, it returns null when you try to access it.

The Solution: Modify the show() Function

To solve this issue, you need to access the img element nested within the div instead of trying to access the src attribute directly from the div. You can achieve this by using the querySelector method to target the img tag. Here’s how you can modify your show() function:

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

Breakdown of the Solution

Use event.currentTarget: This refers to the element to which the event handler is attached (div in this case), rather than the element that was actually clicked (which can be a child element).

Utilize querySelector("img"): This method allows you to search for the img element inside the div that was clicked. By applying this method, you can directly access the img tag.

Retrieve the src Attribute: Once you have the correct img element, you can safely call getAttribute("src") on it to fetch the image source.

Final Code Implementation

Here’s what your full implementation would look like:

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

Conclusion: Making Your Function Work

By adjusting your show() function and targeting the correct img within the div, you’ll successfully retrieve the full path of the image whenever it is clicked. No more null results!

This simple correction will enhance the interactivity of your site and ensure that your JavaScript functions perform as expected. Happy coding!