Skip to main content

What is Vue Global Event Bus?

 The global event bus is not a native API provided by Vue. It is a clever design method summarized by developers in practice. Its principle is to add a property to the prototype of Vue. Once this property is added, Vue Instances and vue components can use this property with the help of prototypes, so as to realize the intercommunication and transfer of data between data. If we need to implement complex communication between components, it is not so convenient to use the props properties of parent and child components. We have written a lot of redundant code layer by layer. At this time, we can use the message bus writing method, which is more simple and convenient. 

Usage steps: register global event bus

new Vue({
  render: h => h(App),
  beforeCreate(){
    Vue.prototype.$bus=this
  }
}).$mount('#app');

User bound event

 methods: {
      needDate(name){
        console.log(name)
        alert("I need data")
      }
    },
    mounted() {
      this.$bus.$on("bindEventName",this.needDate)
    },
    beforeDestroy() {
      this.$bus.$off("bindEventName")
    },

sender trigger event

 methods: {
    send(){
      this.$bus.$emit("bindEventName",this.name)
    }

Labels:

Comments

Post a Comment

Popular posts from this blog

What is the difference between width property 100% and auto in css?

 width:auto: The default width value of block-level elements. When set to this value, the browser will automatically select an appropriate width value to adapt to the width of the parent element. When the width is set to 100%, the width of the child element box The value is equal to the parent's content, and as the parent's content automatically changes, after adding the padding and margin of the child element, its width remains unchanged, which is the difference from setting it to auto. But we most often use width:auto, because it is more flexible, width:100% is used less, because when adding padding or margin, this method is easy to make it exceed the parent box and destroy the original layout.
Post a Comment
Read more

Access to XMLHttpRequest at 'http://localhost:8080/xxx' from origin 'http://localhost:8080' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

 Due to browser same-origin policy restrictions. The Same Origin Policy is a convention. This is the main and essential security feature of the browser. Without the same-origin policy, normal browser functionality may be affected. The web is built on the same-origin policy, and browsers are just one implementation of the same-origin policy. The Same Origin Policy prevents JavaScript scripts from one domain from interacting with content from another domain. The so-called same origin (that is, the same domain) means that two pages have the same protocol, host and port.
Post a Comment
Read more