How to implement event delivery between components in Vue?

Vue is a popular front-end framework that simplifies developers' work when building user interfaces. In Vue, components are the basic units for building user interfaces, and event transmission between components is a requirement often encountered in development. This article will introduce how to implement event delivery between components in Vue, and provide some code examples to illustrate the specific implementation method.

In Vue, parent components can pass data to child components through props. However, if you need to notify the parent component of the occurrence of an event, or if sub-components need to communicate with each other, you can use Vue's custom event mechanism.

First, we need to define an event handling method in the parent component to receive events triggered by the child component. This can be done by using the v-on directive in the parent component, for example:

<template>
  <div>
    <child-component @customEvent="handleEvent" />
  </div>
</template>

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

  export default {
    components: {
      ChildComponent
    },
    methods: {
      handleEvent(payload) {
        // 处理事件
        console.log(payload);
      }
    }
  }
</script>

In the above code, the parent component listens to the customEvent event triggered by the child component by using the v-on directive, and sets the event handler method handleEvent is associated with it. When the child component triggers the customEvent event, the handleEvent method will be executed, and the event parameter payload is also passed to the handleEvent method.

Next, we need to trigger the event in the child component. In Vue, you can trigger custom events through the $emit method, and pass in the data that needs to be passed as parameters. Here is an example:

<template>
  <button @click="emitEvent">触发事件</button>
</template>

<script>
  export default {
    methods: {
      emitEvent() {
        // 触发customEvent事件，并传递数据
        this.$emit('customEvent', '事件触发了');
      }
    }
  }
</script>

In the above code, the @click directive is used on the button in the subcomponent, and the emitEvent method is triggered when the button is clicked. In this method, the customEvent event is triggered using the $emit method, and the string 'event triggered' is passed in as a parameter.

Through the above method, we have achieved event delivery between components in Vue. When the button in the child component is clicked, the customEvent event is triggered, and the parameter 'event triggered' is passed to the handleEvent method of the parent component. In the handleEvent method, we can handle the event as needed.

It should be noted that custom events in Vue are passed one-way, that is, they can only be passed from child components to parent components. If event communication between sibling components is required, you can define an event processing method in the common parent component and use props to pass the processing method to the child component. The child component then calls this method to achieve event delivery.

To sum up, it is relatively simple to implement event transfer between components in Vue. By listening to events triggered by child components in the parent component and using the $emit method to trigger custom events in the child component, we can flexibly implement data transfer and mutual communication between components. This facilitates us to build complex user interfaces and also improves the maintainability of the application.

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