vuejs更新子组件的父数据 [英] vuejs update parent data from child component
问题描述
我开始玩vuejs(2.0)。
我构建了一个包含一个组件的简单页面。
该页面有一个包含数据的Vue实例。
在该页面上,我注册并将组件添加到html。
组件有一个输入[type = text]
。我希望该值反映在父(主Vue实例)上。
I'm starting to play with vuejs (2.0).
I built a simple page with one component in it.
The page has one Vue instance with data.
On that page I registered and added the component to html.
The component has one input[type=text]
. I want that value to reflect on the parent (main Vue instance).
如何正确更新组件的父数据?
从父级传递绑定的prop并不好,并向控制台发出一些警告。他们的文档中有一些东西,但它没有用。
How do I correctly update the component's parent data? Passing a bound prop from the parent is not good and throws some warnings to the console. They have something in their doc but it is not working.
推荐答案
在Vue 2.0中不推荐使用双向绑定使用更多事件驱动的架构。一般来说,孩子不应该改变它的道具。相反,它应该 $ emit
事件,让父母回应这些事件。
Two-way binding has been deprecated in Vue 2.0 in favor of using a more event-driven architecture. In general, a child should not mutate its props. Rather, it should $emit
events and let the parent respond to those events.
在特定情况下,您可以使用 v-model
的自定义组件。这是一种特殊的语法,允许接近双向绑定的东西,但实际上是上述事件驱动架构的简写。你可以在这里阅读 - > https:/ /vuejs.org/v2/guide/components.html#Form-Input-Components-using-Custom-Events 。
In your specific case, you could use a custom component with v-model
. This is a special syntax which allows for something close to two-way binding, but is actually a shorthand for the event-driven architecture described above. You can read about it here -> https://vuejs.org/v2/guide/components.html#Form-Input-Components-using-Custom-Events.
这是一个简单的例子:
Vue.component('child', {
template: '#child',
//The child has a prop named 'value'. v-model will automatically bind to this prop
props: ['value'],
methods: {
updateValue: function (value) {
this.$emit('input', value);
}
}
});
new Vue({
el: '#app',
data: {
parentValue: 'hello'
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.js"></script>
<div id="app">
<p>Parent value: {{parentValue}}</p>
<child v-model="parentValue"></child>
</div>
<template id="child">
<input type="text" v-bind:value="value" v-on:input="updateValue($event.target.value)">
</template>
文档声明
<custom-input v-bind:value="something" v-on:input="something = arguments[0]"></custom-input>
相当于
<custom-input v-model="something"></custom-input>
这就是为什么孩子的道具需要被命名为值,为什么孩子需要$发出名为 input
的事件。
That is why the prop on the child needs to be named value, and why the child needs to $emit an event named input
.
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