Vue进阶(幺贰零):父组件获取子组件验证结果

No Silver Bullet 2020-11-13 07:29:19
vue 组件 进阶 获取 贰零


在开发Vue项目过程中,代码复用之自定义组件是常做事情。当子组件为form表单的时候,父组件需要获取子组件(表单)的验证结果。

尽管有 prop 和事件,但是有时仍然需要在 JavaScript 中直接访问子组件。为此可以使用 ref 为子组件指定一个引用 ID。ref 被用来给元素或子组件注册引用信息。引用信息将会注册在父组件的 $refs 对象上。如果在普通的 DOM 元素上使用,引用指向的就是 DOM 元素;如果用在子组件上,引用就指向组件实例。通过这种方式,便可以在父组件中调用子组件方法!

子组件

<template>
<div>
<el-form :model="aForm" :rules="aRules" ref="aForm">
<el-form-item label="名称" prop="name">
<el-input v-model="aForm.name"></el-input>
</el-form-item>
<el-form-item label="年龄" prop="age">
<el-input v-model="aForm.age"></el-input>
</el-form-item>
</el-form>
</div>
</template>
<script>
export default {
name: 'A',
data() {
return {
aForm: {
name: '',
age: ''
},
aRules: {
name: [
{ required: true, message: '请输入名称', trigger: 'blur' },
{ min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
],
age: [
{ required: true, message: '请输入年龄', trigger: 'blur' }
],
}
}
},
methods: {
validateForm() {
let flag = false
this.$refs['aForm'].validate((valid) => {
flag = valid
})
return flag
}
}
}
</script>

父组件

<template>
<div>
<A ref="a"></A>
<el-button @click="save">保存</el-button>
</div>
</template>
<script>
import A from './a.vue'
export default {
name: 'child-component-validate',
data() {
return {}
},
methods: {
save() {
console.log(this.$refs['a'].validateForm())
}
},
components: {
A
}
}
</script>

当 v-for 用于元素或组件的时候,引用信息将是包含 DOM 节点或组件实例的数组。

关于 ref 注册时间的重要说明:因为 ref 本身是作为渲染结果被创建的,在初始渲染的时候你不能访问它们 - 它们还不存在!$refs 也不是响应式的,因此你不应该试图用它在模板中做数据绑定。

版权声明
本文为[No Silver Bullet]所创,转载请带上原文链接,感谢
https://shq5785.blog.csdn.net/article/details/106427595

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