Скачать или смотреть Solving the Uncaught TypeError in jQuery: A Guide to Accessing CSS Values from Elements

Discover how to fix the `Uncaught TypeError` that occurs when accessing CSS values using jQuery. Follow our step-by-step guide to ensure you're fetching the correct element types and applying CSS effectively.
---
This video is based on the question https://stackoverflow.com/q/70172645/ asked by the user 'Vagelis Vag Ov Oganesov' ( https://stackoverflow.com/u/2656018/ ) and on the answer https://stackoverflow.com/a/70173442/ provided by the user 'Vagelis Vag Ov Oganesov' ( https://stackoverflow.com/u/2656018/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Getting CSS values from an element inside an array loop causes an error in jQuery

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding the CSS Value Error in jQuery

Have you ever faced a frustrating issue while working with jQuery where you needed to retrieve CSS values from child elements inside a loop? It's a common problem that can lead to the dreaded Uncaught TypeError. This guide will dive into this issue, providing a clear explanation and a structured solution to help you overcome it.

The Problem at Hand

When attempting to retrieve the CSS values of child elements, many developers run into the following error:

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

This error can occur when you are trying to access the CSS properties of non-element nodes in your selection. Let's take a look at the code snippet that is causing the issue:

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

In this code, wayps.childNodes returns all child nodes, which can include text nodes and other non-element nodes. As a result, when jQuery tries to access the CSS of such nodes, it throws an error.

Finding the Solution

To fix this error, follow these steps to ensure you are only working with element nodes:

1. Replace IDs with Classes

Start by replacing the ID in your HTML markup with a class. This change will allow you to select all relevant elements more effectively.

Original HTML:

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

Modified HTML:

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

2. Use querySelectorAll

Instead of using querySelector, switch to querySelectorAll to select all elements with the specified class. This method collects only the elements you need:

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

3. Parse CSS Values as Integers

When you're ready to perform calculations with the CSS values, ensure you convert the values to integers correctly. Use parseInt() to achieve this:

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

4. Complete Working Code

After implementing the above solutions, your final code should look like this:

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

Conclusion

By replacing your IDs with classes, using querySelectorAll, and properly parsing your CSS values, you will effectively eliminate the Uncaught TypeError and achieve your desired functionality. This structured approach not only resolves the error but also makes your code cleaner and more efficient.

If you face other issues in jQuery or CSS, don’t hesitate to reach out. Happy coding!