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Скачать или смотреть How to Select a Random Child Element Using DOM in JavaScript

  • vlogize
  • 2025-05-25
  • 1
How to Select a Random Child Element Using DOM in JavaScript
How to select with dom a random child element from an element in Javascript?javascriptdom
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Описание к видео How to Select a Random Child Element Using DOM in JavaScript

Learn how to efficiently select and manipulate child elements using JavaScript's DOM. Discover solutions to common issues faced when working with interactive elements like rating cards.
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This video is based on the question https://stackoverflow.com/q/74338644/ asked by the user 'Davidino' ( https://stackoverflow.com/u/16850827/ ) and on the answer https://stackoverflow.com/a/74338771/ provided by the user 'Franco Torres' ( https://stackoverflow.com/u/20318366/ ) 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 select with dom a random child element from an element in Javascript?

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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How to Select a Random Child Element Using DOM in JavaScript

Creating interactive web elements can be an exciting challenge, especially when it involves user engagement. One common task is to allow users to select options, such as rating cards. However, when working with the Document Object Model (DOM) in JavaScript, you might encounter some challenges. For instance, how do you change the background color of a selected number from a group of div elements? In this post, we will break down this problem and provide a comprehensive solution.

Understanding the Problem

In this scenario, we have a rating card with five numbered divs, from 1 to 5. The user's goal is to select a number representing their rating. After clicking, the selected number's background should change color, indicating their choice. The initial setup might look like this:

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

CSS Styling

Each of these div elements has some CSS styling, ensuring they appear uniform and visually appealing. Here's a quick look at the CSS for one of the divs:

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

Now let's dive into how to make the background change when a user clicks on a number.

The Initial JavaScript Approach

A common approach might be to loop through each element, changing the background when one is clicked. However, this method has several pitfalls, as demonstrated in the user's initial code:

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

Issues with the Initial Approach

Scope Problems: The function myFunction was not within the same scope as the addEventListener.

Using Undefined Variables: The variable element was used before it was declared.

Uniform Style Assignment: The same background color would be applied to all elements, making it impossible to distinguish between selections.

A Better Solution

To implement effective event handling, we can utilize "event delegation." This technique allows us to attach a single event listener to a parent element, rather than individual listeners to each child. Here’s how to do it:

Select the Parent Element: Instead of selecting multiple child elements, we select the parent div with the class numbers.

Add an Event Listener: Attach a click event listener to the parent.

Check the Target: When an event fires, check if the clicked target is one of the child divs.

Updated JavaScript Code

Here’s the revised code using these principles:

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

Key Changes Made

Event Delegation: This approach minimizes the number of event listeners and can improve performance.

Dynamic Color Assignment: Only the clicked element's color changes, easily indicating the chosen number.

Conclusion

By using event delegation and targeting specific child elements, we can create a more efficient and user-friendly rating card. JavaScript's DOM provides powerful tools for interacting with HTML elements, and knowing how to leverage these capabilities can elevate the usability of your web applications.

Enhance your interactive projects by implementing this strategy and watch your user experience improve dramatically!

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