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Скачать или смотреть Understanding this in JavaScript: How to Reference Both DOM Elements and Class Instances

  • vlogize
  • 2025-04-05
  • 0
Understanding this in JavaScript: How to Reference Both DOM Elements and Class Instances
How to reconcile 'this' referencing DOM element and 'this' referencing class?javascriptjqueryclassthis
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Описание к видео Understanding this in JavaScript: How to Reference Both DOM Elements and Class Instances

Struggling to understand how to use `this` in JavaScript? Learn how to effectively reference DOM elements and class instances together in your code with our comprehensive guide.
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This video is based on the question https://stackoverflow.com/q/72849955/ asked by the user 'Dylan B' ( https://stackoverflow.com/u/19474758/ ) and on the answer https://stackoverflow.com/a/72849999/ provided by the user 'Quentin' ( https://stackoverflow.com/u/19068/ ) 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: How to reconcile 'this' referencing DOM element and 'this' referencing class?

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.
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Understanding this in JavaScript: How to Reference Both DOM Elements and Class Instances

JavaScript can be a bit tricky, especially when it comes to the this keyword. If you’re building an interactive feature that responds to user events (like clicking buttons), you might run into problems when this doesn’t reference what you expect. A common scenario arises when you want to simultaneously use this to refer to a DOM element and also to an instance of a class. Let's delve into how to resolve this confusion!

The Problem: Mismatched References

In JavaScript, this can take on different meanings depending on the context in which it is used. In the context of a class method, this typically refers to the class instance. However, in the event handler that you might be using, this points to the object that triggered the event (in this case, a DOM element).

The Example Code

Here's a snippet from a codebase experiencing this issue:

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

The Error Encountered

When the button is clicked, you may encounter a console error saying:

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

This indicates that this inside the selectButton method does not have access to the columnController method because it mistakenly points to the DOM element.

The Solution: Binding this Properly

To use this effectively in your context, you need a way to bind this to the class instance. The simplest approach is to use an arrow function, which maintains the context of this from the enclosing scope (the class instance).

Refactoring the Code

Here’s the refactored version of your code with the appropriate changes made to properly reference both the DOM elements and the class instance:

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

Additional Code for Proper Context

To demonstrate this in practice, you also need to include the relevant HTML and CSS:

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

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

Conclusion

Understanding how this works in JavaScript is crucial, especially when working with classes and handling events. By utilizing arrow functions in your methods, you can easily bind this to the class instance while accessing the necessary DOM elements through event arguments. This approach reduces errors and allows for a smoother interaction within your applications.

Now you can confidently manage the dual nature of this in your JavaScript code. Happy coding!

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