elementplus 提交表单报formEl.validate is not a function？

Question

const formRef = ref<FormInstance>();

const submitForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return;
  console.log(formEl);
  formEl.validate((valid: boolean) => {
    if (valid) {
      window.localStorage.setItem("aaa", JSON.stringify(formModel));
    }
  });
};

输出的formEl是这样？

代码是按照官方示例写的不知道有什么问题？

Answer 1

你的 <el-form> 元素上没有使用 ref 绑定啊，自然就没有表单实例了。

一个简略版的官方示例：

<template>
  <el-form
    ref="ruleFormRef"
    :model="ruleForm"
    :rules="rules"
    label-width="120px"
    class="demo-ruleForm"
    :size="formSize"
    status-icon
  >
    <el-form-item>
      <el-button type="primary" @click="submitForm(ruleFormRef)">
        Create
      </el-button>
      <el-button @click="resetForm(ruleFormRef)">Reset</el-button>
    </el-form-item>
  </el-form>
</template>

<script lang="ts" setup>
import { reactive, ref } from 'vue'
import type { FormInstance, FormRules } from 'element-plus'

const formSize = ref('default')
const ruleFormRef = ref<FormInstance>()


const submitForm = async (formEl: FormInstance | undefined) => {
  if (!formEl) return
  await formEl.validate((valid, fields) => {
    if (valid) {
      console.log('submit!')
    } else {
      console.log('error submit!', fields)
    }
  })
}
</script>