Скачать или смотреть How to Make onClick Function Work for Multiple Dropdown Menus in JavaScript

Learn how to create an efficient JavaScript function to toggle multiple dropdown menus with a single click, enhancing your web interface.
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This video is based on the question https://stackoverflow.com/q/74677621/ asked by the user 'NeoQwerty' ( https://stackoverflow.com/u/20675906/ ) and on the answer https://stackoverflow.com/a/74677719/ provided by the user 'Amir Pasha Bagheri' ( https://stackoverflow.com/u/14877576/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Make onClick Function Work for Multiple Dropdown Menus in JavaScript

Dropdown menus add interactivity to web pages, making them more user-friendly. However, if you're new to JavaScript, setting up these menus correctly might seem daunting. In this guide, we'll explore how to create a single function that toggles multiple dropdown menus without needing external libraries like jQuery.

The Problem

You have multiple dropdown menus, and you want to make them function together using a single click event. The challenge lies in ensuring that each dropdown responds correctly when its respective button is clicked.

Here’s a breakdown of what you currently have:

You have two dropdown menus: one for "Other Sites" and another for "Personal".

You want a single function that can toggle each menu based on which button is clicked rather than writing separate functions for each menu.

The Solution

Simplified Dropdown Menu Code

Instead of creating separate functions for each dropdown, we can create a single function that takes the ID of the dropdown menu as a parameter and toggles its display. Here’s how you can do it:

JavaScript Code

First, let’s adjust your existing JavaScript code to accept an ID parameter:

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

Explanation: The openMenu function now takes an id argument, which will allow us to easily toggle any dropdown based on the button clicked.

HTML Code

Next, we will need to update your HTML to connect the buttons to this new function:

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

How It Works: Each button now calls the openMenu function with the respective dropdown's ID as an argument, allowing the function to act on the correct element.

CSS Handling

Don't forget that in your CSS, you’d need to ensure that the .dropopen class displays the dropdown contents correctly. For example:

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

Testing Your Dropdowns

Once you implement this code, try clicking each button. You should notice that the corresponding dropdown menu opens and closes as expected. This implementation also retains keyboard accessibility, which is crucial for user navigation.

Conclusion

By following these steps, you now have a cleaner, more efficient way of handling multiple dropdown menus with a single onClick function in JavaScript. This not only helps avoid writing redundant code but also enhances maintainability for your web projects.

Feel free to experiment with more menus or add additional functionality as you grow more comfortable with JavaScript!

With a little practice, you'll find that working with JS can be fun and rewarding!