Скачать или смотреть Using this Keyword with jQuery Tag Selectors

Learn how to effectively use the `this` keyword in jQuery to select elements like ` h3 ` tags. Discover clear examples and best practices to avoid errors in your code.
---
This video is based on the question https://stackoverflow.com/q/62584062/ asked by the user 'i rocks technology' ( https://stackoverflow.com/u/13741667/ ) and on the answer https://stackoverflow.com/a/62587123/ provided by the user 'Twisty' ( https://stackoverflow.com/u/463319/ ) 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: Tag selector with 'this' keyword selector

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.
---
Using this Keyword with jQuery Tag Selectors: A Complete Guide

When working with jQuery, one common dilemma developers face is selecting elements within a specific context using the this keyword. If you're trying to select a tag like <h3>, and encountering errors, don't worry! In this post, we will break down how to use the this keyword with jQuery to effectively select elements.

The Problem

You might have come across a snippet like the following when trying to get the text of an <h3> element within a certain context:

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

This line of code will produce an error, leading to frustration. The primary issue here is the incorrect syntax, which does not effectively leverage the this keyword for context-based selection of elements.

The Solution

To correctly select an <h3> element using this, you can follow these methods:

Method 1: Using the Alternative Syntax

Instead of combining this and a tag name directly, you can use jQuery's built-in functionality to specify the context. Here’s how:

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

This approach utilizes the second argument of jQuery, which allows you to define the context for your search—in this case, this.

Method 2: Using find()

Another equivalent way to achieve the same result is by using the find() method. This is often preferred for its readability:

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

Both methods provide the same functionality but use different syntaxes.

Example in Action

Let's look at a practical example to see these methods in action.

HTML and JavaScript Example

Here’s a simple setup where clicking a button will alert the text contained in an <h3> tag:

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

Explanation of the Example

In this example:

We include jQuery from a CDN.

We have a button that contains an <h3> element with the text “Hello World”.

On clicking the button, the jQuery script captures the event and alerts the text of the <h3> element that resides within that button's context using either of the two correct methods we discussed.

Conclusion

Using jQuery's this keyword correctly is crucial for selecting elements in a context-aware manner. By understanding the right syntax to use—whether through $("h3", this) or $(this).find("h3")—you can avoid common pitfalls and streamline your coding experience.

Now you have the tools to confidently use the this keyword with tag selectors in jQuery, making your web development process smoother. Happy coding!