Скачать или смотреть How to Select Parent Elements in JavaScript and jQuery

Learn how to efficiently `select parent elements` in your HTML structure using JavaScript and jQuery with a practical example of creating a sidebar navigation system.
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This video is based on the question https://stackoverflow.com/q/72393339/ asked by the user 'DEVianVisuals' ( https://stackoverflow.com/u/19133995/ ) and on the answer https://stackoverflow.com/a/72397281/ provided by the user 'jcubic' ( https://stackoverflow.com/u/387194/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Select Parent Elements in JavaScript and jQuery

Creating interactive web applications often involves navigating and manipulating HTML elements dynamically. One common issue developers face is selecting parent elements in a structured HTML layout. In this guide, we’ll tackle how to efficiently select parent elements and apply styles based on user interactions, specifically in the context of building a sidebar navigation that remembers the last clicked link.

The Problem

Imagine you are building a sidebar navigation for your website. You want to allow users to easily access different programming topics. Upon clicking a link, the sidebar should highlight related sections, and importantly, it must remember which link was clicked even after the page reloads. This functionality improves user experience significantly.

Here’s an example to illustrate the complexity:

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

When a user clicks on "PHP Advanced," not only should this link be highlighted, but you also want to select its direct parent links and apply styles accordingly.

The Solution

To achieve the desired functionality, you can utilize JavaScript and jQuery. Here’s how to break it down step-by-step:

Step 1: Select Parent Elements

To select parent elements effectively, use the following jQuery methods:

parents('.collapse'): This method selects all ancestor elements that match the specified selector, which in our case is the .collapse class.

prev(): You can then use this method to access the previous sibling of the selected element.

Step 2: Implement the Click Event

You can bind a click event to the link elements to handle the selection:

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

Step 3: Applying the Styles

When the user clicks a link, this code will:

Select all ancestor elements with the class .collapse.

Change their border color to red.

Change the border color of the previous sibling (the link that triggers the collapse) to blue.

Putting It All Together

To see this solution in action, here’s a complete example that includes both the JavaScript and HTML:

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

Conclusion

Selecting parent elements in a hierarchical HTML structure can significantly enhance your web application’s functionality and appearance. By using jQuery’s powerful DOM traversal methods, you can create dynamic interfaces that respond to user actions, such as clicks, elegantly.

With this technique, your sidebar navigation can not only highlight the last clicked link but also maintain a clean and organized structure for a better user experience.

Feel free to implement this solution in your own projects and modify it further to suit your needs!