[英]How to pass parameter to a Vue component to initiate components instance
I am very new to the Vue.我对 Vue 很陌生。 I am trying to learn how to create and re-use Vue components.我正在尝试学习如何创建和重用 Vue 组件。 The initial data passed to a component is not updated on an click event.传递给组件的初始数据不会在单击事件上更新。 Here is my code (full version at https://jsfiddle.net/gpawel/486ysvxj/33/ ) What I am doing doing wrong?这是我的代码(完整版在https://jsfiddle.net/gpawel/486ysvxj/33/ )我做错了什么? Thank you.谢谢你。
<div id="components-demo">
<button-counter count='3'></button-counter>
<br><br>
<button-counter count='4'></button-counter>
</div>
Vue.component('button-counter', {
props: ['count'],
methods: {
add: function() {
return {count: count++}
}
},
template: '<button v-on:click="add()">You clicked me {{count}} times.</button>'
})
new Vue({
el: '#components-demo'
})
Here is the working fiddle: https://jsfiddle.net/68p1u9ks/这是工作小提琴: https://jsfiddle.net/68p1u9ks/
Vue.component('button-counter', {
props: ['initialCount'],
data: function () {
return {
count: 0,
}
},
methods: {
add: function() {
this.count++
},
},
created() {
this.count = this.initialCount
},
template: '<button v-on:click="add()">You clicked me {{count}} times.</button>'
})
I think you need to maintain state inside the button-counter
component.我认为您需要在button-counter
组件内维护 state 。 Also rename the count
prop to initial-count
.还将count
属性重命名为initial-count
。
<div id="components-demo">
<button-counter :initial-count='3'></button-counter>
<br><br>
<button-counter :initial-count='4'></button-counter>
</div>
See your updated fiddle .查看您更新的小提琴。 You are directly mutating the count property, save it as a data first and mutate the internalCount.您正在直接改变 count 属性,首先将其保存为数据并改变 internalCount。 Also, use a :
to cast the prop to a Number and not a string.此外,使用:
将道具转换为数字而不是字符串。
props: ['count'],
data() {
return {
internalCount: this.count
}
},
methods: {
add: function() {
return {
count: this.internalCount++
}
}
},
You can not change props in child component.您不能更改子组件中的道具。 You should use $emit
to change props:您应该使用$emit
来更改道具:
parent component:父组件:
<template>
<div>
<child :count="count" @add="add" />
</div>
</template>
<script>
export default {
data: () => ({
count: 1
}),
methods: {
add() {
this.count = this.count + 1;
}
}
}
</script>
and child component:和子组件:
<template>
<button v-on:click="add()">You clicked me {{inComponentCount}} times.</button>
</template>
<script>
export default {
props: [count],
computed: {
inComponentCount() {
return this.count;
}
},
methods: {
add() {
this.$emit('add')
}
}
}
</script>
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.