Скачать или смотреть How to Fix nested forEach() Issues with HTML Appending in JavaScript

Learn how to resolve issues with appending HTML using nested forEach() in JavaScript and jQuery, ensuring your data is displayed correctly.
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This video is based on the question https://stackoverflow.com/q/72238305/ asked by the user 'Rohit Verma' ( https://stackoverflow.com/u/7333403/ ) and on the answer https://stackoverflow.com/a/72238378/ provided by the user 'zer00ne' ( https://stackoverflow.com/u/2813224/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Debugging Nested forEach Issues in JavaScript

When working with JavaScript and jQuery, you may encounter challenges while trying to append HTML dynamically using nested forEach() loops. This is a common issue that can arise when dealing with complex data structures, especially those nested within arrays. In this guide, we'll explore a specific example of this problem and its solution in a step-by-step manner.

The Problem

You might have a well-structured data set that looks fine when logged to the console, but the display on the webpage is not what you expected. In this instance, let's examine the following data structure, which contains information about different salons and their services:

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

When attempting to render this data onto a webpage using jQuery and forEach() loops, you may notice that the discounted prices are not displaying correctly.

Initial Code Example

Your initial attempt to populate the HTML might look something like this:

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

The Solution

To resolve this issue, you need to adjust your approach. Instead of trying to append the discounted price in a separate loop, you can directly interpolate it within the string of the first forEach() loop, in the section where you're appending service-wrapper-body. Here’s how:

Modified Code Example

Revising your code slightly will help ensure that the discounted price displays correctly:

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

Explanation of Changes

Direct Access: Instead of looping through the services to access the discounted price, we've directly accessed the first service's discounted price using: ${val.services[0].discounted_price}.

Elimination of Nested Loop: By removing the unnecessary nested loop, we streamline the code, which makes it more efficient and easier to read.

Full Functional Code

Here’s how the complete code works, including all necessary HTML and CSS setup:

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

Conclusion

Dynamic HTML rendering with JavaScript can sometimes be tricky, especially when dealing with nested arrays and loops. By understanding how to properly structure your data access and eliminate unnecessary loops, you can effectively resolve rendering issues.

Thank You!

We hope this post helps you debug your forEach() loops. If you have any questions or further challenges while manipulating data in JavaScript and jQuery, feel free to ask. Happy coding!