Скачать или смотреть How to Make Newly Cloned Buttons Work with an Existing Event Listener in JavaScript

Learn how to efficiently use event delegation in JavaScript to ensure your newly cloned buttons respond to clicks just like the original button.
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This video is based on the question https://stackoverflow.com/q/75493385/ asked by the user 'Tibo Mertens' ( https://stackoverflow.com/u/17312520/ ) and on the answer https://stackoverflow.com/a/75493471/ provided by the user 'Carsten Massmann' ( https://stackoverflow.com/u/2610061/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Make Newly Cloned Buttons Work with an Existing Event Listener in JavaScript

Are you facing the issue where newly cloned buttons don’t respond to click events, while your original button works just fine? You've come to the right place! In this guide, we'll explore an effective solution to ensure that every time you create new buttons dynamically, they also behave just like the original button.

The Problem Statement

Imagine you have a button labeled 'Leave'. When you click it, you want to generate 10 new 'Leave' buttons on the screen. So far, so good! However, when you click any of these newly created buttons, they don’t trigger the same event as the original. What could be going wrong?

You might have already encountered a common pitfall: event listeners are only added to the original button, not the new ones. Let me show you how to fix this issue and make all buttons responsive!

The Solution: Event Delegation

Instead of attaching an event listener to the fixed original button, we'll use a technique called event delegation. This involves adding a single event listener to the parent container that encompasses all buttons. When any button is clicked, we can check if it’s one we want to respond to.

Here’s a step-by-step breakdown of how to implement this:

Step 1: Modify the HTML and CSS Structure

Your HTML structure can remain as it is—here’s a quick recap:

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

And the CSS for positioning buttons:

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

Step 2: Update the JavaScript Code

Now, replace your existing JavaScript with the following implementation that uses event delegation:

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

Explanation of the New Code

Event Listener on Parent Container: By attaching the click event to the .container, we cover all existing and future child buttons.

Checking the Clicked Element: Inside the event listener, we check if the clicked button's text matches "Leave". If it doesn't, we exit the function early with return.

Creating New Buttons: When the original button is clicked, 10 new buttons are created, styled, and appended to the container.

Conclusion

With this approach, every time you click the original 'Leave' button, you won't just see new buttons; they'll also respond just like the original when clicked. Event delegation is a powerful technique that not only reduces the need for multiple event listeners but also creates a more dynamic user experience.

Give it a try in your coding project, and enjoy the added functionality of your buttons!