Скачать или смотреть How to Create a List in JavaScript with Checkbox Interactivity

Learn how to create a dynamic `list` in JavaScript that interacts with checkboxes for adding and removing items.
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This video is based on the question https://stackoverflow.com/q/64870311/ asked by the user 'CaptainLevii' ( https://stackoverflow.com/u/14063820/ ) and on the answer https://stackoverflow.com/a/64870415/ provided by the user 'wjatek' ( https://stackoverflow.com/u/4636502/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Dynamic List in JavaScript Using Checkboxes

Creating interactive user interfaces is essential for modern web development. One common requirement is to manage lists dynamically based on user input, specifically by using checkboxes to add or remove items. In this post, we’ll walk you through how to implement a list in JavaScript that updates itself based on checkbox selections. Let’s dive into the details!

The Problem

You may have encountered a scenario where you want to create a simple list in JavaScript populated by strings that can be manipulated through checkboxes. When a checkbox is checked, the corresponding string should be added to a list, and when unchecked, it should be removed from that list. This requirement can often arise in form applications or settings where user selections must be tracked.

The Solution

Step 1: Setting Up the HTML Structure

To start, ensure that you have a basic HTML structure in place. Below is a sample code for creating a table with checkboxes, where each checkbox is associated with a string value:

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

Step 2: Adding the JavaScript Functionality

Next, we will add some functionality to our checkboxes. We need to write JavaScript code that listens for checkbox clicks, adds checked items to an array, and removes unchecked items from that array.

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

Step 3: Explanation of the Code

Setup the Environment: We begin by ensuring the DOM is ready using $(document).ready().

Array Declaration: We declare an empty array, myArray, to store the selected string values.

Event Listener: We set up a click event listener on all checkboxes using jQuery. When a checkbox is clicked, it checks if it is checked or unchecked:

Checked: If the checkbox is checked, the value is added to myArray using the .push() method.

Unchecked: If the checkbox is unchecked, we find its index in myArray and remove it using the .splice() method, ensuring to check if it exists first.

Logging the Result: Finally, we log the contents of myArray to the console, allowing us to see the current selected items easily.

Conclusion

In this post, we demonstrated how to create a dynamic list in JavaScript that responds to user input through checkboxes. By utilizing an array to store the strings and leveraging jQuery for event handling, we can create a smooth and interactive user experience. This is just the tip of the iceberg—further customizations can be implemented to enhance the functionality even more! Give it a try and enhance your web applications with interactive lists!