Vue component value transfer method: 1. Use props to pass data. The parent component passes the data to the child component through HTML attributes, and the child component receives the passed data through props; 2. Use $emit Trigger events to transfer data. The sub-component uses $emit to trigger custom events. The parent component uses v-on to listen to the sub-component custom events. 3. Use provide/inject to transfer values across levels. The parent component provides data through provide, and the sub-component Use inject to receive data.
#The operating environment of this tutorial: Windows 10 system, dell g3 computer.
Value transfer between Vue components can be achieved in three ways: props, $emit and provide/inject.
Use props to pass data:
Pass data to the child component through HTML attributes in the parent component. Child components receive data passed by parent components through props.
Parent component:
<template> <div> <ChildComponent :message="message"/> </div> </template> <script> import ChildComponent from 'ChildComponent.vue'; export default { components: { ChildComponent }, data() { return { message: 'Hello' } } } </script>
Child component:
<template> <div> {{ message }} </div> </template> <script> export default { props: { message: String } } </script>
Use $emit to trigger events to pass data:
In child components Use $emit to trigger custom events and pass the data to be passed as parameters. The parent component uses v-on to listen to the custom events of the child component and obtain the passed data.
Parent component:
<template> <div> <ChildComponent v-on:custom-event="updateData"/> </div> </template> <script> import ChildComponent from 'ChildComponent.vue'; export default { components: { ChildComponent }, data() { return { message: '' } }, methods: { updateData(data) { this.message = data; } } } </script>
Child component:
<template> <div> <button @click="updateMessage">Update Message</button> </div> </template> <script> export default { methods: { updateMessage() { this.$emit('custom-event', 'New Message'); } } } </script>
Use provide/inject for cross-level value transfer:
In the parent Provide data through provide in the component, and then use inject to receive the data in the child component.
Parent component:
<template> <div> <ChildComponent /> </div> </template> <script> import ChildComponent from 'ChildComponent.vue'; export default { components: { ChildComponent }, provide() { return { message: 'Hello' } } } </script>
Child component:
<template> <div> {{ message }} </div> </template> <script> export default { inject: ['message'] } </script>
The above are the three ways for Vue components to pass values. According to specific scenarios and needs, you can choose a suitable method to transfer data between components.
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