Скачать или смотреть How to Initialize Data with Props in Vue.js Without Making It Reactive

Learn how to effectively set up and manage local data in Vue.js using props without direct reactivity, ensuring your application functions smoothly and efficiently.
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This video is based on the question https://stackoverflow.com/q/66960792/ asked by the user 'Shak Ham' ( https://stackoverflow.com/u/1614637/ ) and on the answer https://stackoverflow.com/a/66960897/ provided by the user 'danh' ( https://stackoverflow.com/u/294949/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Vue.js: Initializing Data with Props Without Reactivity

Vue.js is a powerful and flexible framework for building user interfaces, but managing data can sometimes present challenges. One common scenario developers encounter is initializing a data object using props while avoiding unwanted reactivity to the original prop. In this guide, we'll explore a simple solution that allows you to achieve this goal effectively.

The Problem

Imagine you have a Vue component that receives a user object as a prop. You want to create a local data property, currentUser, based on this prop. However, you want to ensure that currentUser does not remain reactive to changes made to the original user prop. This is necessary for scenarios where you want to preserve the initial state of the prop without it affecting the component's behavior.

Key Goals:

Keep currentUser reactive to the view but not to the user prop.

Maintain the initial values from the prop without direct connection to updates.

The Solution

Step 1: Define the Props

First, you need to define the user prop in the component. This will allow you to pass the user object when using the component.

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Step 2: Initialize Local Data

In the data function, you can set up an object to serve as your local representation of the user. However, you won't assign it directly to the prop but rather prepare to copy from it later.

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Step 3: Copy the Prop on Mount

To achieve the goal of not having currentUser reactive to the prop after initialization, you'll want to utilize the mounted lifecycle hook. This is where you can make a copy of the user prop at the moment the component is mounted.

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Step 4: Reference the Local Copy in the Template

Now that you've copied the user prop into your local userAsMounted object, you can safely reference this in your component's template without worrying about reactivity with the original prop.

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Conclusion

By following these steps, you can efficiently initialize a local data object in Vue.js using props while avoiding unwanted reactivity. This approach enables your component to display the correct data without having lingering effects from changes in the prop.

Now, you will enjoy more control over your data management and ensure a smoother user experience in your applications.

Feel free to share your thoughts and experiences with Vue.js below!