How to Display 1 Data Without Looping Using insertAdjacentHTML in JavaScript

Learn how to effectively use `insertAdjacentHTML` to add HTML elements without creating unwanted loops in JavaScript.
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How to Display 1 Data Without Looping Using insertAdjacentHTML in JavaScript

Are you encountering repeated outputs when trying to use the insertAdjacentHTML method in JavaScript? If you've found yourself scratching your head as to why the output keeps looping, you're not alone. Many developers face this issue when they want to display a single piece of data adjacent to an element while preventing duplication. In this guide, we’ll explore how to use the insertAdjacentHTML method effectively to avoid this common pitfall.

Understanding the Problem

You might be inserting HTML into your page on a button click, but instead of adding just one instance of that HTML, it appears multiple times. This can happen if the event listener for the button click remains active after the first click. Essentially, every time you click the button, the listener is executing the function repeatedly, thereby creating the looping output.

Solution Overview

To solve this problem, you have primarily two approaches:

Utilization of the { once: true } parameter in the click listener.

Removing existing HTML before inserting the new one.

Let’s break down each of these solutions further.

Approach 1: Use { once: true } in the Event Listener

By adding the { once: true } option when you attach the event listener, you effectively limit the function to only execute once for each listener. Here's how to implement this:

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

Breakdown of the Code:

insertAdjacentHTML("afterend", string);: Inserts the HTML string directly after the .test element.

With the { once: true } parameter added, the listener will automatically be removed after its first invocation, avoiding any looping behavior.

Approach 2: Remove Existing HTML Before Inserting New Content

If you prefer to replace any previously inserted content instead of avoiding multiple event bindings, you can remove the existing adjacent HTML before inserting the new one. Here’s how that would look:

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

Breakdown of the Code:

The remaining code handles the insertion of the new HTML just like in the first approach.

Conclusion

Both methods allow you to display a single HTML element without the friction of unwanted duplication. Whether you opt for the one-time listener approach or choose to remove existing content beforehand depends on your specific use case and preferences.

Arming yourself with these techniques will not only solve your immediate problem but also enhance your overall understanding of handling HTML dynamically in JavaScript. Happy coding!