VUE3 Quick Start: Use Props to pass data to subcomponents

VUE3 is the latest Vue.js version, which has been greatly enhanced in terms of performance, experience and flexibility. In this article, we will learn how to use VUE3’s Props to pass data to child components.

Vue.js is an MVVM (Model-View-ViewModel) framework, which is based on components. Each component has a local state and possible actions, so communication between components is crucial. In Vue.js, parent components can pass data to child components through Props, and child components receive data by listening to these passed Props.

Before using Props to pass data to sub-components, we need to first understand the component syntax of VUE3. In VUE3, a component can define its behavior through the setup() function. The setup() function returns an object that contains the component's state and behavior.

Let's take a look at the following code, which is a simple parent component that passes a simple string to the child component it contains:

<template>
  <div>
    <child-component message="Hello World!"></child-component>
  </div>
</template>

<script>
import ChildComponent from './ChildComponent.vue'

export default {
  components: {
    ChildComponent
  }
}
</script>

In the above code , we reference ChildComponent.vue, which is our child component. In the template tag of the parent component, we pass a string named message to the child component. We will see this property in the child component soon.

Next, let’s take a look at the code of ChildComponent.vue:

<template>
  <div>{{ childMessage }}</div>
</template>

<script>
export default {
  props: {
    message: {
      type: String,
      required: true
    }
  },
  setup(props) {
    const childMessage = props.message

    return {
      childMessage
    }
  }
}
</script>

In the above code, we see the props object. Props provide a convenient way to pass data from parent components to child components. In our child component, we define a property called message, which must be a string. We also force the parent component to pass this attribute through the required option.

In the setup function, we pass a parameter named props, which contains all Props. We assign the message attribute in props to the childMessage variable, and then we return an object containing childMessage, which is part of our child component state.

Finally, in our template, we bind the childMessage variable through double curly brace syntax.

This is the entire process of using Props to pass data to subcomponents. Of course, in actual applications, there may be more complex data transfer and rendering methods, but the above example is enough to illustrate the basic usage and syntax of Props.

Summary

It is very simple and flexible to use VUE3's Props and setup() functions to pass data to sub-components. Through Props, you can pass simple strings, numbers, Boolean values, etc., as well as complex objects and arrays. This makes communication between components easy and natural, streamlining workflow.

I hope this article will be helpful to you and give you a deeper understanding of the syntax and use of VUE3 components.

The above is the detailed content of VUE3 Quick Start: Use Props to pass data to subcomponents. For more information, please follow other related articles on the PHP Chinese website!