Question

如何在 vue.js 中将数据传递给子组件

2017-11-16

5055

vue.js vuejs2 vue-component

我是 vue.js 的新手，我尝试将一个值传递给子组件。

HTML

<div id="example">
   <my-component v-bind:data="parentData"></my-component>
</div>

JS

Vue.component('my-component', {
  props: ['data'],
  template: '<div>Parent component with data: {{ data.value }}!<div is="my-component-child" v-bind:data="childData"></div></div>'
});

Vue.component('my-component-child', {
  props: ['data'],
  template: '<div>Child component with data: {{ data.value }} </div>'
});

new Vue({
  el: '#example',
  data: {
    parentData: {
      value: 'hello parent!'
    },
    childData: {
      value: 'hello child!'
    }
  }
});

https://jsfiddle.net/v9osont9/2/

我收到了这个错误：

[Vue warn]: Property or method "childData" is not defined on the instance but referenced during render. Make sure to declare reactive data properties in the data option. (found in )

[Vue warn]: Error in render function: (found in )

TypeError: Cannot read property 'value' of undefined

正确的做法是什么？

Answer 1

当您调用

<my-component v-bind:data="parentData"></my-component>

时，您仅将 parentData 传递给父组件，而 childData 超出范围。

您需要将 childData 嵌套在您的 parentData 中：

new Vue({
    el: '#example',
    data: {
        parentData: {
            value: 'hello parent!',
            childData: {
                value: 'hello child!'
            }
        }
    }
});

并将其传递给您的子组件，如下所示：

<div is="my-component-child" v-bind:data="data.childData">