How to use event bus to achieve cross-component communication in Vue

Vue is a popular JavaScript framework that helps developers build complex applications quickly. In Vue, cross-component communication is a common task and can be achieved through the event bus.

The event bus is a mechanism provided by Vue that allows components to communicate through events. The event bus is a global Vue instance on which events can be listened to and triggered. So when one component fires an event, other components can receive and respond to the event.

When using the event bus, you need to first create a global event bus object on the Vue instance. The event bus can be created through the following code:

// 创建事件总线
Vue.prototype.$eventBus = new Vue()

After creating the event bus, you can use the event bus in the component for cross-component communication.

First, in the component that sends the event, the event can be triggered by the following code:

this.$eventBus.$emit('event-name', data)

The "event-name" here is the name of the event and can be customized. At the same time, the data that needs to be passed in the event can be passed as the second parameter. For example, the following code sends an event named "update-message" to the event bus, passing a string as the data:

this.$eventBus.$emit('update-message', 'Hello World!')

Then, in the component that receives the event, you can pass the following code Listen to the event:

this.$eventBus.$on('event-name', function (data) {
  // 处理接收到的数据
})

The "event-name" here is the same name used when sending the event. At the same time, when the event is triggered, the event bus will pass the passed data as a parameter to the callback function. In this callback function, the received data can be processed.

For example, the following code will listen to the "update-message" event on the event bus and update the received string as a message to the component's state:

this.$eventBus.$on('update-message', function (message) {
  this.message = message
})

Things to note Yes, the event bus is a global object and can therefore be used in any component. But also be aware that if used incorrectly, the event bus can cause the structure of your application to become cluttered. Therefore, when using the event bus, it is recommended to use it only when necessary and to follow good component design principles to ensure the maintainability and reusability of the application.

To summarize, to use the event bus in Vue to achieve cross-component communication, you need to first create a global event bus object on the Vue instance, and then use $emit and $emit respectively in the components that need to send or receive events. $on method to trigger and listen for events. Through the event bus, different components can communicate easily, thereby increasing the flexibility and maintainability of the application.

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