Скачать или смотреть Resolving the Computed Array Binding Issue in Vue.js

Learn how to address the common issue of updating computed arrays in Vue.js by implementing reactive data props for dynamic interactions.
---
This video is based on the question https://stackoverflow.com/q/71184687/ asked by the user 'aujau' ( https://stackoverflow.com/u/16909223/ ) and on the answer https://stackoverflow.com/a/71185092/ provided by the user 'firefly' ( https://stackoverflow.com/u/10366695/ ) 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: Changes made to a computed array won't show after a prop binding

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.
---
Resolving the Computed Array Binding Issue in Vue.js: A Step-by-Step Guide

As a budding Vue.js developer, you might encounter challenges when manipulating computed properties, especially arrays. One common issue arises when changes made to a computed array do not reflect as expected in your components. In this guide, we'll explore a practical scenario where a click event should change the background color of a div element, but fails due to incorrect handling of the computed properties.

The Problem: Computed Properties and Reactivity

In Vue.js, computed properties are used to define properties that depend on other properties. However, when it comes to mutating objects in computed properties or passing them down to child components, one must be cautious.

Example Scenario

In your case, you have a computed property that produces an array of objects. You want to change the check property of these objects upon clicking an associated div, which should change the background color based on the value of check.

Here’s a brief overview of where things typically go wrong:

Changes to computed properties do not persist or re-render as expected.

Prop binding issues can arise when child components attempt to modify the props received from their parent.

The Solution: Using Reactive Data Props Instead

Step 1: Store the Object in Child Component Data

To make reactive modifications, you'll need to maintain a separate mutable copy of the object in the child component. This way, any changes will trigger Vue.js's reactivity system:

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

Step 2: Update Parent Component’s Data

If you need to reflect changes back to the parent component, avoid using computed properties. Instead, you will emit events with the updated object. Here’s how:

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

Step 3: Implementing the Reactive Parent Component

In your parent component, declare a reactive array for managing your dynamic data:

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

Step 4: Watching for Changes in the Parent Component

Lastly, implement a watcher in your parent component that reacts to the emitted changes from the child:

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

Conclusion

By following the steps outlined above, you can effectively manage updates to computed arrays in Vue.js without running into the common pitfalls. Using reactive data props allows for seamless interaction between components and ensures that changes are reflected correctly in your application.

Remember:

Avoid mutating props directly in child components.

Use data properties to store and manipulate props locally.

Emit events to reflect changes back to the parent for reactivity.

By implementing these practices, you'll have a more robust and intuitive Vue.js application that gracefully handles computed properties and dynamic interactions!