Analysis of communication between vue components

Communication between components (father and son, brother)

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Parent component to child component

Parent-to-child method (1) attribute passing props

// Subcomponent 
<template> 
 <ul>
 <li v-for="item in dataList">{{item}}</li>
 </ul> 
</template>

<script>
 export default { 
 props : { dataList : [] }
 }
</script>

// Parent component 
<template>
 <component-child v-bind:data-list="dataList"> </component-child> 
 <input v-model="dataInput" v-on:keyup.13="addDataItem()" ></input>
</template>

<script>

import ComponentChild from './child.vue'
export default { 
 data () { 
 return { 
 dataInput: "", 
 dataList : [ 'hello world!','welcome to use vue.js' ] 
 } 
 }, 
 components : { ComponentChild }, 
 methods : { 
 addDataItem () { 
 let self = this 
 if( !(self.dataInput && self.dataInput.length > 0) ) { return } 
 self.dataList.push( self.dataInput ) 
 self.dataInput = "" 
 } 
 }
}
</script>

Parent-to-child method (2) broadcast event delivery vm. $broadcast

// Subcomponent 
<template> 
 <ul> 
 <li v-for="item in dataList">{{item}}</li> 
 </ul> 
</template>

<script>
export default { 
 data () { 
 return { 
 dataList : [ 'hello world!', 'welcome to use vue.js' ] 
 } 
 }, 
 events : { 
 addChildDataEvent : function ( dataInput ) { 
 this.dataList.push( dataInput ) 
 } 
 }
}
</script>

// Parent component 
<template> 
 <component-child></component-child> 
 <input v-model="dataInput" v-on:keyup.13="addDataItem()" ></input>
</template>

<script>
 import ComponentChild from './child.vue'
 export default { 
 data () { 
 return { dataInput: "" } 
 }, 
 components : { ComponentChild }, 
 methods : { 
 addDataItem () { 
 let self = this 
 if( !(self.dataInput && self.dataInput.length > 0) ) { return } 
 // Broadcast to subcomponents  
 self.$broadcast( 'addChildDataEvent', self.dataInput ) 
 self.dataInput = "" } 
 }
 }
</script>

Child component to parent component

Child-to-parent method dispatches event delivery vm. $dispatch

// Subcomponent 
<template> 
 <input v-model="dataInput" v-on:keyup.13="addDataItem()" ></input>
</template>

<script>
 export default { 
 data () { 
 return { 
 dataInput: "" 
 } 
 }, 
 methods : { 
 addDataItem () { 
 let self = this
 if( !(self.dataInput && self.dataInput.length > 0) ) { return }
 // Send an event to the parent component  
 self.$dispatch( 'addFatherDataEvent', self.dataInput )
 self.dataInput = "" 
 } 
 }
 }
</script>

// Parent component 
<template> 
 <ul> 
 <li v-for="item in dataList">{{item}}</li> 
 </ul> 
 <component-child></component-child>
</template>

<script>
import ComponentChild from './child.vue'
export default { 
 data () { 
 return { 
 dataList : [ 'hello world!', 'welcome to use vue.js' ] 
 } 
 },
 components : { ComponentChild }, 
 events : { 
 addFatherDataEvent : function ( dataInput ) { 
 this.dataList.push( dataInput ) 
 } 
 }
}
</script>

Mutual transmission of brother components

Parent component agent passes child (vm. dispatch) parent (vm. broadcast) child event method pass

<template> 
 <ul> 
 <li v-for="item in dataList">{{item}}</li> 
 </ul> 
</template>

<script> 
export default { 
 data () { 
 return { 
 dataList : [ 'hello world!', 'welcome to use vue.js' ] 
 } 
 },
 events : { 
 addChildDataEvent : function ( dataInput ) { 
 this.dataList.push( dataInput ) 
 } 
 }
}
</script>

<template>
 <input v-model="dataInput" v-on:keyup.13="addDataItem()" ></input>
</template>

<script>
export default { 
 data () { 
 return { dataInput: "" } 
 }, 
 methods : { 
 addDataItem () { 
 let self = this 
 if( !(self.dataInput && self.dataInput.length > 0) ) { return } // Send an event to the parent component  
 self.$dispatch( 'agentDataEvent', self.dataInput ) 
 self.dataInput = "" 
 }
 }
}
</script>

<template> 
<component-child1></component-child1>
<component-child2></component-child2>
</template>

<script>
import ComponentChild1 from './child1.vue'
import ComponentChild2 from './child2.vue'

export default { 
 components : { ComponentChild1, ComponentChild2 }, 
 events : { 
 agentDataEvent : function( dataInput ) { 
 this.$broadcast('addChildDataEvent', dataInput) 
 } 
 }
}
</script>

Inter-instance communication

Pass an instance into another instance as a parameter

<template>
 <div> 
 <p> Inter-instance communication </p> 
 <ul>
 <li v-for="item in dataList">{{item}}</li>
 </ul> 
 </div>
</template>
<script> 
export default { 
 data () { 
 return { 
 dataList : [ 'hello world!', 'welcome to use vue.js' ] 
 } 
 }, 
 events : { 
 addDataEvent : function ( dataInput ) { 
 this.dataList.push( dataInput ) 
 } 
 }
}
</script>

// Parent component 
<template>
 <component-child v-bind:data-list="dataList"> </component-child> 
 <input v-model="dataInput" v-on:keyup.13="addDataItem()" ></input>
</template>

<script>

import ComponentChild from './child.vue'
export default { 
 data () { 
 return { 
 dataInput: "", 
 dataList : [ 'hello world!','welcome to use vue.js' ] 
 } 
 }, 
 components : { ComponentChild }, 
 methods : { 
 addDataItem () { 
 let self = this 
 if( !(self.dataInput && self.dataInput.length > 0) ) { return } 
 self.dataList.push( self.dataInput ) 
 self.dataInput = "" 
 } 
 }
}
</script>

0

// Parent component 
<template>
 <component-child v-bind:data-list="dataList"> </component-child> 
 <input v-model="dataInput" v-on:keyup.13="addDataItem()" ></input>
</template>

<script>

import ComponentChild from './child.vue'
export default { 
 data () { 
 return { 
 dataInput: "", 
 dataList : [ 'hello world!','welcome to use vue.js' ] 
 } 
 }, 
 components : { ComponentChild }, 
 methods : { 
 addDataItem () { 
 let self = this 
 if( !(self.dataInput && self.dataInput.length > 0) ) { return } 
 self.dataList.push( self.dataInput ) 
 self.dataInput = "" 
 } 
 }
}
</script>

1

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