Скачать или смотреть How to Show and Hide Elements with the Same Class Using JavaScript

Learn how to manage the visibility of elements with the same class in JavaScript, preventing errors and enhancing user experience!
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This video is based on the question https://stackoverflow.com/q/68204894/ asked by the user 'Charmaine Ho' ( https://stackoverflow.com/u/14460006/ ) and on the answer https://stackoverflow.com/a/68205034/ provided by the user 'Kinglish' ( https://stackoverflow.com/u/1772933/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Show and Hide Elements with the Same Class Using JavaScript

JavaScript is a fantastic tool for creating dynamic user interfaces, allowing you to show or hide elements on your web page based on user interactions or predefined conditions. In this post, we'll explore a common issue developers face: managing the visibility of multiple elements that share the same class without modifying the HTML structure. Let's discuss how you can effectively solve this problem.

The Problem: Managing Element Visibility

Imagine you have several elements on your webpage, such as headings (<h1> tags) and images that share a class. You want to dynamically show or hide these images based on the text content of the headings. For instance, if a heading contains the text "ADIDAS BY PHARRELL WILLIAMS", we want the corresponding image to be hidden.

You might face errors like "Cannot set property 'display' of undefined", which typically occurs when trying to access an element that doesn't exist or has not been defined properly in your JavaScript code. Fortunately, there are effective ways to manage these elements without running into such issues.

The Solution: Using JavaScript to Control Visibility

Step 1: Setup Your Variables

First, you need to gather references to the headings and images you want to manipulate. Here's how to do that:

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Step 2: Iterate Through the Headings

Next, you need to loop through each heading and determine whether or not to hide its corresponding image based on certain criteria:

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Example Implementation

Here's a complete example implementation of this logic using the HTML structure you may have:

HTML Structure

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Complete JavaScript Code

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Step 3: Using nextElementSibling for Simplicity

An alternative and often simpler approach is to use the nextElementSibling property. This method allows you to directly access the next sibling element (the image) without having to handle arrays. Here’s how you set it up:

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Conclusion

By following these steps, you can effectively manage the visibility of elements sharing the same class using JavaScript. Whether you choose to use arrays for organization or the simpler nextElementSibling method, both approaches can help avoid the common errors that occur when trying to manipulate DOM elements. This knowledge not only enhances your coding skills but also significantly improves the user experience on your web pages.

Take some time to implement these techniques, and you'll find they can greatly simplify complex visibility logic in your projects.