記錄父元件中呼叫子元件的表單驗證

子元件實現表單驗證

　　子元件中需要實現呼叫表單驗證的方法，子元件OrderInput.vue如下程式碼：

<template>
  <div>
    <el-form :model="postForm" ref="postForm" label-width="100px" class="demo-ruleForm">
      <el-form-item
        label="數值"
        prop="num"
        :rules="[{ required: true, message: '不能為空', trigger: 'change'}]"
 

      >
        <el-input type="number" v-model.number="postForm.num" autocomplete="off"></el-input>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {
  props: {
    obj: {
      type: Object,
      default: undefined
    }
  },
  data(){
    
 
return {
        postForm: {
            num: this.obj?this.obj.num:undefined
        }
    }
  },
  methods: {
    submitForm () {
        return new Promise(function (resolve, reject) {
            this.$refs.postForm.validate(valid => {
                resolve(valid)
            })
        })
    }
  }
}
 
</script>

submitForm()方法，就是子元件中實現的呼叫當前表單驗證的方法

父元件設定子元件的ref

　　父元件需要在使用子元件是，為子元件定義ref，之後再通過refs獲取子元件物件呼叫子元件的表單驗證方法。父元件實現如下：

<template>
  <div>
    <h1>驗證表單</h1>
    <order-input ref="order" :obj="postForm"></order-input>
    <el-button
      type="primary"
      @click="handleClick"
    >
      提交
    </el-button>
  </div>
</template>

<script>
import OrderInput from './OrderInput'

export default {
  components: {
    OrderInput
  },
  data () {
    return {
      postForm: {
        age: undefined
      }
    }
  },
  methods: {
    handleClick () {
      this.$refs.order.submitForm().then(valid => {
        if(valid){
            console.log(valid, '提交表單')
        }else{
            console.log(valid, '驗證不通過')
        }
      })
    }
  }
}
</script>