javascript - 无法使 vue.js element-ui 对话框在子组件内工作

Question

这是父组件:

<template lang="pug">
  .wrapper
    el-button(type="primary", @click="dialogAddUser = true") New User
    hr
    // Dialog: Add User
    add-edit-user(:dialog-visible.sync="dialogAddUser")
</template>

<script>
import * as data from '@/components/partials/data'
import AddUser from './partials/AddUser'

export default {
  name: 'users',
  components: { AddUser },

  data () {
    return {
      users: data.users,
      dialogAddUser: false
    }
  }
}
</script>

这是子组件:

<template lang="pug">
  el-dialog(width="75%", title="New User", :visible.sync="dialogVisible", top="5vh")
    div 'el-dialog-body' - content goes here
</template>

<script>
  export default {
    name: 'add-user',
    props: {
      dialogVisible: Boolean
    }
  }
</script>

我可以打开 dialog 但是当使用 dialog 中右上角的按钮关闭对话框时，我收到了这个错误:

Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "dialogVisible"

后来我尝试玩，做了如下的操作，但现在我连dialog都打不开了:

<template lang="pug">
  el-dialog(width="75%", title="New User", :visible.sync="visibleSync", top="5vh")
    div 'el-dialog-body' - content goes here 
</template>

<script>
  export default {
    name: 'add-user',
    props: {
      dialogVisible: Boolean
    },
    watch: {
      visibleSync (val) {
        this.$emit('update:dialogVisible', val)
      }
    },
    data () {
      return {
        visibleSync: this.dialogVisible
      }
    }
  }
</script>

Answer 1

如果 visible.sync 有效，则该组件会发出一个 update:visible 事件。

因此，不要在子级中发生变异，而是将事件传播给父级，而不是:

:visible.sync="dialogVisible"

做

:visible="dialogVisible", v-on:update:visible="visibleSync = $event"

完整代码:

<template lang="pug">
  el-dialog(width="75%", title="New User", :visible="dialogVisible", v-on:update:visible="visibleSync = $event", top="5vh")
    div 'el-dialog-body' - content goes here 
</template>

<script>
  export default {
    name: 'add-user',
    props: {
      dialogVisible: Boolean
    },
    watch: {
      visibleSync (val) {
        this.$emit('update:dialogVisible', val)
      }
    },
    data () {
      return {
        visibleSync: this.dialogVisible
      }
    }
  }
</script>

---

作为另一种选择，您可以直接从 v-on 监听器发出信号，而无需 visibleSync 本地属性:

<template lang="pug">
  el-dialog(width="75%", title="New User", :visible="dialogVisible", v-on:update:visible="$emit('update:dialogVisible', $event)", top="5vh")
    div 'el-dialog-body' - content goes here 
</template>

<script>
  export default {
    name: 'add-user',
    props: {
      dialogVisible: Boolean
    }
  }
</script>