How to Iterate Over an Object in JavaScript and Populate a List with Specific Elements

Learn how to effectively iterate over a JavaScript object and create a list (`li` elements) with specific properties to display in your HTML.
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How to Iterate Over an Object in JavaScript and Populate a List with Specific Elements

When learning JavaScript, one common task is managing data structures such as objects and arrays. If you've ever found yourself needing to pull certain elements from those structures and display them dynamically on a webpage, you're not alone! In this guide, we'll tackle a real-world scenario where you need to extract specific keys from a nested object and create a list (using HTML <li> elements) to showcase them.

The Problem

Imagine you have an object that contains multiple entries related to DSL services. Each service is represented as a key-value pair within another object. Your goal is to:

Extract keys such as "DSL-I-100000", "DSL-IP-100000", and "DSL-IP-16000".

Add these keys as items in an unordered list (<ul>).

Here’s a simplified view of the object we'll be working with:

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

With this, let’s jump into how we can achieve this goal!

The Solution

To populate an unordered list with the specified keys from the object, follow these simple steps:

Step 1: Access the Object Keys

Step 2: Create HTML Elements

Next, for each key, you will create an <li> element, which will represent the key in the list.

Step 3: Append to the <ul>

Finally, append each <li> to the <ul> in your HTML.

Here is how your complete code will look:

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

HTML Structure

Make sure to have an empty <ul> element in your HTML where the list items will be appended:

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

Conclusion

Understanding how to iterate over objects in JavaScript and manipulate the DOM is crucial for any aspiring web developer. By following these simple steps, you were able to successfully extract keys from an object and populate them into an HTML list. This approach can be applied to various scenarios, making your web applications dynamic and engaging.

If you're just starting out with JavaScript, don't be discouraged by complex structures—practicing with examples like this will improve your skills. Happy coding!