Prop
prop parent component is used to pass data to a custom attribute.
Data required by props parent component of the data to the sub-components, sub-assemblies need to explicitly declare with props option "prop":
<div id="app">
<child message="hello!"></child>
</div>
<script>
// 注册
Vue.component('child', {
// 声明 props
props: ['message'],
// 同样也可以在 vm 实例中像 "this.message" 这样使用
template: '<span>{{ message }}</span>'
})
// 创建根实例
new Vue({
el: '#app'
})
</script>
Dynamic Prop
HTML attributes with similar binding to a v-bind expression, the value of props may be dynamically bound by v-bind to the data in the parent assembly. Whenever data changes parent element, this change will be conducted to the sub-assembly:
<div id="app">
<div>
<input v-model="parentMsg">
<br>
<child v-bind:message="parentMsg"></child>
</div>
</div>
<script>
// 注册
Vue.component('child', {
// 声明 props
props: ['message'],
// 同样也可以在 vm 实例中像 "this.message" 这样使用
template: '<span>{{ message }}</span>'
})
// 创建根实例
new Vue({
el: '#app',
data: {
parentMsg: '父组件内容'
}
})
</script>
Custom Event
Parent component is the use of props to transfer data to sub-assemblies, subassemblies but if want to transfer data back, you need to use custom events!
We can use the v-on to bind custom events and each instance Vue implements the event interface (Events interface), namely:
- Use
$on(eventName)listens for events - Use
$emit(eventName)trigger events
In addition, the parent component can be directly used v-on to listen to events triggered by the subassembly where the use of sub-assemblies.
The following example neutron components and it has been completely decoupled the outside. All it does is trigger an internal event a parent component of concern:
<div id="app">
<div id="counter-event-example">
<p>{{ total }}</p>
<button-counter v-on:increment="incrementTotal"></button-counter>
<button-counter v-on:increment="incrementTotal"></button-counter>
</div>
</div>
<script>
Vue.component('button-counter', {
template: '<button v-on:click="incrementHandler">{{ counter }}</button>',
data: function () {
return {
counter: 0
}
},
methods: {
incrementHandler: function () {
this.counter += 1
this.$emit('increment')
}
},
})
new Vue({
el: '#counter-event-example',
data: {
total: 0
},
methods: {
incrementTotal: function () {
this.total += 1
}
}
})
</script>
Jump pages pass value
1. Go through the router-link
<router-link
:to="{
path: 'name',
params: {
key:value
},
query: {
key: value
}
}">
跳转
</router-link>
2. $ router mode Jump
. This $ router.push ({name: 'Named Route', params: {Parameter name: Parameter value Parameter name: Parameter Value}})
Of acceptance
this. $ route.params. parameter name
this. $ route.query. parameter name
