Vue.config.devtools = false
Vue.config.productionTip = false
let modal = Vue.extend({
template: `
<div class="modal">
<p>Balance: {{ balance }}</p>
<input @input="$emit('input', $event.target.value)" :value="value">
<button @click="$emit('input', balance)">ALL</button>
</div>
`,
props: ['balance', 'value']
})
function makeComponent(data) {
return { render(h) { return h(modal, data) } }
}
Vue.component('app', {
template: `
<div>
<p>Balance: {{ balance }}</p>
<p>To withdraw: {{ withdrawAmount }}</p>
<p>Will remain: {{ balance - withdrawAmount }}</p>
<button @click="onClick">Withdraw</button>
<modal-container ref="container"/>
</div>`,
data () {
return {
withdrawAmount: 0,
balance: 123
}
},
methods: {
onClick () {
this.$refs.container.show(makeComponent({
props: {
balance: String(this.balance),
value: String(this.withdrawAmount)
},
on: {
input: (value) => {
this.withdrawAmount = Number(value)
}
}
}))
}
}
})
Vue.component('modal-container', {
template: `
<div>
<component v-if="canShow" :is="modal"/>
</div>
`,
data () {
return { modal: undefined, canShow: false }
},
methods: {
show (modal) {
this.modal = modal
this.canShow = true
},
hide () {
this.canShow = false
this.modal = undefined
}
}
})
new Vue({
el: '#app'
})
.modal {
background-color: gray;
width: 300px;
height: 100px;
margin: 10px;
padding: 10px;
}
* {
font-family: "Source Sans Pro", "Helvetica Neue", Arial, sans-serif;
color: #2c3e50;
line-height: 25px;
font-size: 14px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17-beta.0/vue.js"></script>
<div id="app">
<app></app>
</div>
我们的用例是:
输入字段旁边有一个“全部”按钮,用户可以轻松输入等于其余额的数字
问题:当用户单击“全部”时,“模式”组件将触发一个带有余额值的“输入”事件,被调用者组件将收到该事件并更新其“ withdrawAmount”。但是应该将“ withdrawAmount”作为“值”属性传递回“模式”,并进一步更新输入字段,这不会发生。