Скачать или смотреть How to Make an Event Fire on Every Button Click Using JavaScript and jQuery

Discover how to trigger an event every time a button is clicked in your JavaScript or jQuery code, and solve common issues with event handling.
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This video is based on the question https://stackoverflow.com/q/74874947/ asked by the user 'russelhd' ( https://stackoverflow.com/u/20727222/ ) and on the answer https://stackoverflow.com/a/74875171/ provided by the user 'Harrison' ( https://stackoverflow.com/u/15291770/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Fire Events on Every Button Click: A Guide

Buttons are a fundamental part of web applications, allowing users to trigger actions such as submitting forms, adding items, or deleting entries. Often, novice developers encounter issues where an event fires only once, particularly when dealing with dynamically generated elements. Today, we will tackle the question: How can I make an event fire every time on button click?

Understanding the Problem

You might start with a simple to-do application where each time a user clicks the Add button, a list item is created. However, you might find that the delete button for each item only functions once. Why does this happen?

When you create elements dynamically, the event listeners for those elements must also be reattached. If they aren't, the event will only trigger the first time the button is clicked. Let's see how we can solve this with some effective JavaScript and jQuery techniques.

A Simple Solution

To ensure that your delete button works every single time it’s clicked, there are a couple of strategies you can use. Let's break it down step by step.

Step 1: Create and Build Your List

First, we need to build a function that constructs the list of items. This function will be called every time an item is added or deleted. Here's how:

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

Step 2: Handle the Deletion

Next, we want to create a function that takes an index as an argument and removes that item from the list:

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

Step 3: Reacting to Button Clicks

Now we can set up our Add button to work seamlessly, adding items to our todos array and then calling our buildItems() function to render the updated list:

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

Step 4: Handling Input

Lastly, we add an input event to clear the error message as the user types again:

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

Full HTML Structure

Here is the complete HTML template you can use along with the JavaScript code:

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

Conclusion

By restructuring your event handling, we ensure that the deleting action is now functional and triggered every time a corresponding delete button is clicked. Remember, dynamically created elements require their event handlers to be bound correctly, and using functions to manage your tasks helps keep your code organized and efficient.

Happy coding, and may your buttons always click as expected!