Implementation of non parent-child component communication through Bus mechanism
1. Create an empty instance (Bus central event Bus can also be called intermediate component)
2. Use $emit $on to trigger and listen to events to realize the communication between non parent and child components
Before using this.$bus.$on to transfer values between components, this.$bus.$off event needs to be logged out
Namely:
this.$bus.$off('hiHeader').$on('hiHeader', (val) => {
this.sending = val
})
See: Before using this.$bus.$on to transfer values between components, this.$bus.$off event needs to be logged out
I. by this.$bus.$on()
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script type="text/javascript" src="vue.js"></script>
<div id="app"></div>
<script type="text/javascript">
// Define communication middleware
Vue.prototype.$bus = new Vue()
var myHeader = {
template: `
<div>I am the head.|{{sending}}
</div>
`,
data() {
return {
sending: ''
}
},
created() {
// Unbound before binding to prevent multi component click failure
// Here this.$bus.$on monitors the middleware to obtain data
this.$bus.$off('hiHeader').$on('hiHeader', (val) => {
this.sending = val
})
}
}
var myFoot = {
template: `
<div>I am foot.
<button @click="sendToHeader">Send a message to the head</button>
</div>
`,
methods: {
sendToHeader() {
// Trigger the hiHeader event to pass data
this.$bus.$emit('hiHeader', 'My head is not made of dough')
}
}
}
new Vue({
el: '#app',
components: {
myHeader,
myFoot
},
template: `
<div>
<myHeader></myHeader>
<myFoot></myFoot>
</div>
`
})
</script>
</body>
</html>II. Redirect through this
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script type="text/javascript" src="vue.js"></script>
<div id="app"></div>
<script type="text/javascript">
// Define communication middleware
Vue.prototype.$bus = new Vue()
var myHeader = {
template: `
<div>I am the head.|{{sending}}
</div>
`,
data() {
return {
sending: ''
}
},
created() {
// Redirect this
var transfer = this
// transfer.$bus.$off('hiHeader').$on('hiHeader', function (val) {
// transfer.sending = val
// })
transfer.$bus.$on('hiHeader', (val)=>{
transfer.sending = val
})
}
}
var myFoot = {
template: `
<div>I am foot.
<button @click="sendToHeader">Send a message to the head</button>
</div>
`,
methods: {
sendToHeader() {
// Trigger the hiHeader event to pass data
this.$bus.$emit('hiHeader', 'My head is not made of dough')
}
}
}
new Vue({
el: '#app',
components: {
myHeader,
myFoot
},
template: `
<div>
<myHeader></myHeader>
<myFoot></myFoot>
</div>
`
})
</script>
</body>
</html>