应用二：Vue之ElementUI Form表单校验

 

（注：本文适用于有一定Vue基础或开发经验的读者，文章就知识点的讲解不一定全面，但却是开发过程中很实用的）

 

  表单校验是前端开发过程中最常用到的功能之一，根据个人的工作经验总结在此对表单校验功能的基础用法进行整理说明~

 

如下代码是Form表单校验的demo示例：

<template>
  <div >
    <el-dialog title="表单校验示例" :close-on-click-modal="false" :visible.sync="dialogVisible" width="600px">
      <el-form ref="form" :model="form" :inline="true" :rules="rules">
        <el-row>
          <el-col :span="12">
            <el-form-item label="商品名称:" prop="productName">
              <el-input v-model="form.productName" clearable placeholder="请输入"></el-input>
            </el-form-item>
          </el-col>
          <el-col :span="12">
            <el-form-item label="商品类型:" prop="productType">
              <el-select v-model="form.productType" clearable placeholder="请选择">
                <el-option v-for="item in productTypeList" :key="item.id" :label="item.name" :value="item.id">
                </el-option>
              </el-select>
            </el-form-item>
          </el-col>
        </el-row>
        <el-row>
          <el-col :span="24" style="text-align: center;margin-top: 20px;">
            <el-button @click="dialogVisible= false">取消</el-button>
            <el-button type="primary" @click="save">保存</el-button>
          </el-col>
        </el-row>
      </el-form>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: 'demo',
  data() {
    let validateProductName = (rule, value, callback) => {
      if(value === '' || value === null) {
        callback(new Error('请输入商品名称'))
      }else if(value.length > 50) {
        callback(new Error('商品名称不能超过50个字符'))
      }else {
        callback()
      }
    } 
    return {
      dialogVisible: true,
      productTypeList: [],
      form: {
        productName: '',
        productType: ''
      },
      rules: {
        productName: [{required: true, validator: validateProductName, trigger: 'blur'}],
        productType: [{required: true, message: '请选择商品类型', trigger: 'change'}]
      }
    }
  },
  methods: {
    save() {
      this.$refs.form.validate((valid) => {
          if(valid) {
            console.log('校验通过')
          }else {
            console.log('校验不通过')
          }
      })
    }
  }
}
</script>

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