vue3 secondary directory js error

Vue3 is one of the more popular frameworks for front-end development. During the actual development process, you sometimes encounter some problems and errors. This article will talk about a secondary directory js error encountered when using Vue3.

Problem Description

When using Vue3 to develop a project, the project structure adopts a two-level directory structure. In the js file of a certain page, the relevant methods and properties of Vue3 are used, but an error message appears during the compilation process. The specific error message is as follows:

Uncaught TypeError: Cannot read property '$refs' of undefined

After investigation, it was found that this error was caused by the js file in the secondary directory being unable to correctly obtain the $refs attribute defined in the parent component.

Solution

For this error problem, there are two main solutions:

Method 1: Use provide and inject to pass data

In In the parent component, use the provide method to pass data to the child component, and in the child component, use the inject method to obtain the data in the parent component. The specific code is as follows:

// Provide
provide('ref', this.$refs) is defined in the parent component;

// Inject is defined in the child component
inject : ['ref'],

In the child component, you can get the $refs attribute in the parent component through this.$inject.ref.

Method 2: Use Vue.observable to achieve data sharing

Vue.observable is a new method in Vue3 for data sharing. Through this method, data can be shared between different components. The specific operations are as follows:

// Define shared data in the parent component
const sharedData = Vue.observable({
ref: null,
});

// Pass data through shared data
provide('sharedData', sharedData);

// Get shared data in child components
const sharedData = inject('sharedData');
sharedData.ref = this.$refs;

Both methods can solve the problem of not being able to obtain the $refs attribute in the parent component in the secondary directory. The difference is that the first method is to pass data through the provide and inject methods, while the second method is to achieve data sharing through Vue.observable.

Summary

When using Vue3 to develop a project, you need to pay special attention to the problem that the js file in the secondary directory cannot obtain the properties of the parent component. This problem can be better solved by using the provide and inject methods provided by Vue3 and the Vue.observable method. Through studying this article, I believe that readers have mastered the method to solve this problem, and I hope it will be helpful to everyone in Vue3 development.

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