Скачать или смотреть How to Keep Your React Dropdowns in Check: Toggling the Right One

Learn how to ensure that only the clicked dropdown in a list of React cards opens, avoiding the issue of all dropdowns toggling simultaneously.
---
This video is based on the question https://stackoverflow.com/q/62668303/ asked by the user 'Tayyab Rahman' ( https://stackoverflow.com/u/8198106/ ) and on the answer https://stackoverflow.com/a/62803275/ provided by the user 'Mordechai' ( https://stackoverflow.com/u/1751640/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: React array mapping, toggles all drop-downs on click, I want to open the dropdown for the clicked card only

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Keep Your React Dropdowns in Check: Toggling the Right One

When developing applications with React, especially those involving interactive components like dropdowns, one common challenge developers face is managing the state of multiple components effectively. A typical scenario might involve a list of cards, where each card has an associated dropdown menu. The goal is to ensure that when a user clicks on a dropdown button, only the dropdown for that specific card opens, rather than all dropdowns opening at once.

In this guide, we’ll walk through the solution to this issue step by step. We'll dive into how to leverage React's state management to achieve the desired behavior.

Understanding the Problem

Imagine you have a feed displaying multiple cards, much like a social media feed. Each card features a dropdown menu that allows users to take actions, such as sharing or bookmarking the quote displayed. However, when the dropdown button is clicked, all dropdowns open simultaneously. This behavior is not user-friendly, as it clutters the interface and makes it difficult for users to navigate.

Expected Behavior

The expected functionality is clear: Only the dropdown of the clicked card should open, while all others remain closed.

A Breakdown of the Solution

Step 1: Initialize State

Instead of having a boolean open state that indicates whether a dropdown is open or closed, we can modify it to keep track of which dropdown is currently open.

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

Step 2: Create the Toggle Function

Next, we need to create a toggle function that updates the state to either set the currently opened dropdown or close it if it is already open.

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

Step 3: Update the JSX Rendering

Now, we need to update the rendering logic of the dropdowns in our JSX code. The key here is to ensure that we only render the dropdown if its corresponding card has the active id. Here's how it would look:

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

Summary of Key Changes

State Management: Changed open to hold an id rather than a boolean value.

Dynamic Toggling: Modified the toggle function to check if the clicked card's dropdown is already open.

Conditional Rendering: Rendered the dropdown conditionally based on the current open state related to the specific card’s id.

Conclusion

By implementing these changes, you can ensure that interacting with one dropdown won’t affect the others, resulting in a cleaner, more user-friendly interface. It’s a straightforward adjustment in your React application that can significantly enhance the user experience.

Now go ahead and apply this approach to your projects to offer your users a seamless interaction with dropdowns in a list format!