<el-form-item label="事故形态" pop="xingtai"> <el-select v-model="form.xingtai" @change="chaxingtai(form.xingtai)" placeholder="请选择事故形态" size="small" > <el-option label="碰撞" value="碰撞"></el-option> <el-option label="刮蹭" value="刮蹭"></el-option> <el-option label="碾压" value="碾压"></el-option> <el-option label="翻车" value="翻车"></el-option> <el-option label="坠车" value="坠车"></el-option> <el-option label="失火" value="失火"></el-option> <el-option label="撞固定物" value="撞固定物"></el-option> <el-option label="撞静止车辆" value="撞静止车辆"></el-option> <el-option label="其他" value="其他" ></el-option> </el-select> <div v-if="xingtaiqita" style="width: 200px"> <el-input type="textarea" v-model="form.select_1" size="small" clearable > ></el-input > </div> </el-form-item>以上代码写出表单验证

你可以使用element-ui提供的表单验证来验证该字段是否为空。示例代码如下：

<template>
  <el-form :model="form" :rules="rules" ref="form">
    <el-form-item label="事故形态" prop="xingtai" pop="xingtai">
      <el-select
        v-model="form.xingtai"
        @change="chaxingtai(form.xingtai)"
        placeholder="请选择事故形态"
        size="small"
      >
        <el-option label="碰撞" value="碰撞"></el-option>
        <el-option label="刮蹭" value="刮蹭"></el-option>
        <el-option label="碾压" value="碾压"></el-option>
        <el-option label="翻车" value="翻车"></el-option>
        <el-option label="坠车" value="坠车"></el-option>
        <el-option label="失火" value="失火"></el-option>
        <el-option label="撞固定物" value="撞固定物"></el-option>
        <el-option label="撞静止车辆" value="撞静止车辆"></el-option>
        <el-option label="其他" value="其他"></el-option>
      </el-select>
      <div v-if="xingtaiqita" style="width: 200px">
        <el-input
          type="textarea"
          v-model="form.select_1"
          size="small"
          clearable
        ></el-input>
      </div>
    </el-form-item>
    <el-form-item>
      <el-button type="primary" @click="submitForm">提交</el-button>
    </el-form-item>
  </el-form>
</template>

<script>
export default {
  data() {
    return {
      form: {
        xingtai: '',
        select_1: ''
      },
      xingtaiqita: false,
      rules: {
        xingtai: [
          {
            required: true,
            message: '请选择事故形态',
            trigger: 'change'
          }
        ]
      }
    }
  },
  methods: {
    chaxingtai(value) {
      if (value === '其他') {
        this.xingtaiqita = true
      } else {
        this.xingtaiqita = false
      }
    },
    submitForm() {
      this.$refs.form.validate(valid => {
        if (valid) {
          // 表单验证通过，提交表单
          console.log('submit')
        } else {
          // 表单验证失败
          console.log('error submit')
          return false
        }
      })
    }
  }
}
</script>

在上面的代码中，我们给`el-form-item`组件设置了`prop`属性为`xingtai`，这是为了在验证时使用。在`rules`中，我们设置了`xingtai`字段必填，如果该字段为空，则会提示用户选择事故形态。在`submitForm`方法中，我们调用了`this.$refs.form.validate()`方法来进行表单验证，如果验证成功，则可以提交表单，否则会提示用户错误信息。