How to Loop Through Each div with a Specific Class Using JavaScript

Learn how to effectively loop through elements with specific classes in JavaScript, ensuring your search functionality for FAQs only highlights relevant results.
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Mastering JavaScript: Looping Through div Elements with Specific Classes

Do you find it challenging to filter search results effectively on your FAQ pages? You're not alone! Many developers struggle with ensuring that only relevant results are displayed when users search for keywords. In this post, we will explore a common JavaScript problem where you need to loop through div elements with a specific class and modify their appearance based on whether they contain searched keywords.

The Challenge

Imagine you have a list of FAQ questions categorized under the class faq-question. As a user types keywords into a search field, you want to highlight the questions that contain those keywords by wrapping them in <mark> tags. However, you might face a situation where all faq-question divs are highlighted instead of just the relevant ones. Here is a simplified version of your HTML setup:

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

The goal is to ensure that only those div elements that contain the <mark> tag get their background color changed to indicate they are relevant to the user's search.

The Solution

Let's walk through how to correctly implement this feature. The mistake that many developers make is in variable naming within the loop. Here’s how you can correct your JavaScript code to achieve the desired functionality:

Step-by-Step Code Breakdown

Accessing the FAQ Questions:

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

Looping Through Each Question:
Utilize a for loop to iterate through each element.

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

Checking for the <mark> Element:
Within the loop, check if each question contains a <mark> tag. You can do this using the getElementsByTagName() method which returns a list of elements with the specified tag name.

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

Changing Background Colors:
If the <mark> tag is found, change the background color; otherwise, reset it.

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

Here’s the Complete Code:

Putting it all together, the complete modified code will look like this:

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

Conclusion

By following these steps and ensuring that your variables in the JavaScript loop are correctly named and scoped, you can effectively filter through your div elements. This approach not only enhances the user experience on your FAQ page but also ensures that the results presented are directly relevant to the user’s queries.

Now, with a little tweak in your JavaScript code, you can make your FAQ page intuitive and interactive for your users!