Element Plus，基于 Vue 3，面向设计师和开发者的组件库

Element Plus 官网：https://element-plus.org/zh-CN/

Element Plus Form 动态表单自定义效验规则，官网示例代码中没有，官网示例中的动态表单是固定的规则，本文讲解动态表单自定义规则的使用

目录

1、官网动态表单示例代码

2、表单自定义规则

3、动态表单自定义规则

3.1、单字段动态表单

3.2、多字段动态表单

4、总结

---

1、官网动态表单示例代码

先看官网动态表单示例代码

<template>
  <el-form
    ref="formRef"
    :model="dynamicValidateForm"
    label-width="120px"
    class="demo-dynamic"
  >
    <el-form-item
      prop="email"
      label="Email"
      :rules="[
        {
          required: true,
          message: 'Please input email address',
          trigger: 'blur',
        },
        {
          type: 'email',
          message: 'Please input correct email address',
          trigger: ['blur', 'change'],
        },
      ]"
    >
      <el-input v-model="dynamicValidateForm.email" />
    </el-form-item>
    
    <el-form-item
      v-for="(domain, index) in dynamicValidateForm.domains"
      :key="domain.key"
      :label="'Domain' + index"
      :prop="'domains.' + index + '.value'"
      :rules="{
        required: true,
        message: 'domain can not be null',
        trigger: 'blur',
      }"
    >
      <el-input v-model="domain.value" />
      <el-button class="mt-2" @click.prevent="removeDomain(domain)"
        >Delete</el-button
      >
    </el-form-item>
    <el-form-item>
      <el-button type="primary" @click="submitForm(formRef)">Submit</el-button>
      <el-button @click="addDomain">New domain</el-button>
      <el-button @click="resetForm(formRef)">Reset</el-button>
    </el-form-item>
  </el-form>
</template>

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

const formRef = ref<FormInstance>()
const dynamicValidateForm = reactive<{
  domains: DomainItem[]
  email: string
}>({
  domains: [
    {
      key: 1,
      value: '',
    },
  ],
  email: '',
})

interface DomainItem {
  key: number
  value: string
}

const removeDomain = (item: DomainItem) => {
  const index = dynamicValidateForm.domains.indexOf(item)
  if (index !== -1) {
    dynamicValidateForm.domains.splice(index, 1)
  }
}

const addDomain = () => {
  dynamicValidateForm.domains.push({
    key: Date.now(),
    value: '',
  })
}

const submitForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.validate((valid) => {
    if (valid) {
      console.log('submit!')
    } else {
      console.log('error submit!')
      return false
    }
  })
}

const resetForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.resetFields()
}
</script>

运行效果

这个是把 rules 写死在 el-form-item 标签上的

2、表单自定义规则

官网的自定义规则是在 el-form 标签上添加 rules 属性，并在 rules 属性中定义自定义规则，el-form-item 标签通过 prop 属性对应找到规则

官网示例代码

<template>
  <el-form
    ref="ruleFormRef"
    :model="ruleForm"
    status-icon
    :rules="rules"
    label-width="120px"
    class="demo-ruleForm"
  >
    <el-form-item label="Password" prop="pass">
      <el-input v-model="ruleForm.pass" type="password" autocomplete="off" />
    </el-form-item>
    <el-form-item label="Confirm" prop="checkPass">
      <el-input
        v-model="ruleForm.checkPass"
        type="password"
        autocomplete="off"
      />
    </el-form-item>
    <el-form-item label="Age" prop="age">
      <el-input v-model.number="ruleForm.age" />
    </el-form-item>
    <el-form-item>
      <el-button type="primary" @click="submitForm(ruleFormRef)"
        >Submit</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 ruleFormRef = ref<FormInstance>()

const checkAge = (rule: any, value: any, callback: any) => {
  if (!value) {
    return callback(new Error('Please input the age'))
  }
  setTimeout(() => {
    if (!Number.isInteger(value)) {
      callback(new Error('Please input digits'))
    } else {
      if (value < 18) {
        callback(new Error('Age must be greater than 18'))
      } else {
        callback()
      }
    }
  }, 1000)
}

const validatePass = (rule: any, value: any, callback: any) => {
  if (value === '') {
    callback(new Error('Please input the password'))
  } else {
    if (ruleForm.checkPass !== '') {
      if (!ruleFormRef.value) return
      ruleFormRef.value.validateField('checkPass', () => null)
    }
    callback()
  }
}
const validatePass2 = (rule: any, value: any, callback: any) => {
  if (value === '') {
    callback(new Error('Please input the password again'))
  } else if (value !== ruleForm.pass) {
    callback(new Error("Two inputs don't match!"))
  } else {
    callback()
  }
}

const ruleForm = reactive({
  pass: '',
  checkPass: '',
  age: '',
})

const rules = reactive<FormRules<typeof ruleForm>>({
  pass: [{ validator: validatePass, trigger: 'blur' }],
  checkPass: [{ validator: validatePass2, trigger: 'blur' }],
  age: [{ validator: checkAge, trigger: 'blur' }],
})

const submitForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.validate((valid) => {
    if (valid) {
      console.log('submit!')
    } else {
      console.log('error submit!')
      return false
    }
  })
}

const resetForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.resetFields()
}
</script>

运行效果

3、动态表单自定义规则

动态表单自定义规则就是将动态表单和自定义规则结合，在 el-form-item 标签属性 rules 上添加自定义规则

3.1、单字段动态表单

看下面代码

<template>
  <el-form
    ref="formRef"
    :model="dynamicValidateForm"
    label-width="120px"
    class="demo-dynamic"
  >
    <el-form-item
      prop="email"
      label="Email"
      :rules="[
        {
          required: true,
          message: 'Please input email address',
          trigger: 'blur',
        },
        {
          type: 'email',
          message: 'Please input correct email address',
          trigger: ['blur', 'change'],
        },
      ]"
    >
      <el-input v-model="dynamicValidateForm.email" />
    </el-form-item>
    <el-form-item
      v-for="(domain, index) in dynamicValidateForm.domains"
      :key="domain.key"
      :label="'Domain' + index"
      :prop="'domains.' + index + '.value'"
      :rules="[
        {
          required: true,
          message: 'domain can not be null',
          trigger: 'blur',
        },
        { validator: validatePass, trigger: 'blur' }
      ]"
    >
      <el-input v-model="domain.value" />
      <el-button class="mt-2" @click.prevent="removeDomain(domain)"
        >Delete</el-button
      >
    </el-form-item>
    <el-form-item>
      <el-button type="primary" @click="submitForm(formRef)">Submit</el-button>
      <el-button @click="addDomain">New domain</el-button>
      <el-button @click="resetForm(formRef)">Reset</el-button>
    </el-form-item>
  </el-form>
</template>

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

const formRef = ref<FormInstance>()
const dynamicValidateForm = reactive<{
  domains: DomainItem[]
  email: string
}>({
  domains: [
    {
      key: 1,
      value: '',
    },
  ],
  email: '',
})

interface DomainItem {
  key: number
  value: string
}

const removeDomain = (item: DomainItem) => {
  const index = dynamicValidateForm.domains.indexOf(item)
  if (index !== -1) {
    dynamicValidateForm.domains.splice(index, 1)
  }
}

const addDomain = () => {
  dynamicValidateForm.domains.push({
    key: Date.now(),
    value: '',
  })
}

const submitForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.validate((valid) => {
    if (valid) {
      console.log('submit!')
    } else {
      console.log('error submit!')
      return false
    }
  })
}

const resetForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.resetFields()
}

const validatePass = (rule: any, value: any, callback: any) => {
  if (value === '') {
    callback(new Error('Please input the password'))
  } else {
    if (value.length > 5) {
      callback(new Error('密码长度不能超过5'))
    }
    callback()
  }
}
</script>

运行效果

3.2、多字段动态表单

<template>
  <el-form
    ref="formRef"
    :model="dynamicValidateForm"
    label-width="120px"
    class="demo-dynamic"
  >
    <el-form-item
      prop="email"
      label="Email"
      :rules="[
        {
          required: true,
          message: 'Please input email address',
          trigger: 'blur',
        },
        {
          type: 'email',
          message: 'Please input correct email address',
          trigger: ['blur', 'change'],
        },
      ]"
    >
      <el-input v-model="dynamicValidateForm.email" />
    </el-form-item>

    <template v-for="(domain, index) in dynamicValidateForm.domains" :key="domain.key">
      <el-form-item
        :label="'Domain' + index"
        :prop="'domains.' + index + '.value'"
        :rules="[
          {
            required: true,
            message: 'domain can not be null',
            trigger: 'blur',
          },
          { validator: validatePass, trigger: 'blur' }
        ]"
      >
        <el-input v-model="domain.value" />
      </el-form-item>
      <el-form-item
        :label="'Name' + index"
        :prop="'domains.' + index + '.name'"
        :rules="[
          {
            required: true,
            message: 'domain can not be null',
            trigger: 'blur',
          },
          { validator: validateName, trigger: 'blur' }
        ]"
      >
        <el-input v-model="domain.name" />
        <el-button class="mt-2" @click.prevent="removeDomain(domain)">Delete</el-button>
      </el-form-item>
  </template>
    
    <el-form-item>
      <el-button type="primary" @click="submitForm(formRef)">Submit</el-button>
      <el-button @click="addDomain">New domain</el-button>
      <el-button @click="resetForm(formRef)">Reset</el-button>
    </el-form-item>
  </el-form>
</template>

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

const formRef = ref<FormInstance>()
const dynamicValidateForm = reactive<{
  domains: DomainItem[]
  email: string
}>({
  domains: [
    {
      key: 1,
      value: '',
      name: ''
    },
  ],
  email: '',
})

interface DomainItem {
  key: number
  value: string
}

const removeDomain = (item: DomainItem) => {
  const index = dynamicValidateForm.domains.indexOf(item)
  if (index !== -1) {
    dynamicValidateForm.domains.splice(index, 1)
  }
}

const addDomain = () => {
  dynamicValidateForm.domains.push({
    key: Date.now(),
    value: '',
    name: '',
  })
}

const submitForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.validate((valid) => {
    if (valid) {
      console.log('submit!')
    } else {
      console.log('error submit!')
      return false
    }
  })
}

const resetForm = (formEl: FormInstance | undefined) => {
  if (!formEl) return
  formEl.resetFields()
}

const validatePass = (rule: any, value: any, callback: any) => {
  if (value === '') {
    callback(new Error('Please input the password'))
  } else {
    if (value.length > 5) {
      callback(new Error('密码长度不能超过5'))
    }
    callback()
  }
}
const validateName = (rule: any, value: any, callback: any) => {
  if (value === '') {
    callback(new Error('name 不能为空'))
  } else {
    if (value.length > 10) {
      callback(new Error('name长度不能超过10'))
    }
    callback()
  }
}
</script>

运行效果

4、总结

动态表单自定义效验规则，是将官网 rules 对象改成数组后，添加自定义规则即可，这种方式同样适用于 View UI Plus，下面是  View UI Plus 代码

<template>
  <Form ref="formDynamic" :model="formDynamic" :label-width="80" style="width: 300px">
      <template v-for="(item, index) in formDynamic.items">
        <FormItem
                v-if="item.status"
                :key="index"
                :label="'Item ' + item.index"
                :prop="'items.' + index + '.value'"
                :rules="[
                  {required: true, message: 'Item ' + item.index +' can not be empty', trigger: 'blur'},
                  { validator: validatePassCheck, trigger: 'blur' }
                ]">
            <Row>
                <Col span="18">
                    <Input type="text" v-model="item.value" placeholder="Enter something..."></Input>
                </Col>
                <Col span="4" offset="1">
                    <Button @click="handleRemove(index)">Delete</Button>
                </Col>
            </Row>
        </FormItem>
      </template>
      <FormItem>
          <Row>
              <Col span="12">
                  <Button type="dashed" long @click="handleAdd" icon="md-add">Add item</Button>
              </Col>
          </Row>
      </FormItem>
      <FormItem>
          <Button type="primary" @click="handleSubmit('formDynamic')">Submit</Button>
          <Button @click="handleReset('formDynamic')" style="margin-left: 8px">Reset</Button>
      </FormItem>
  </Form>
</template>
<script>
  export default {
      data () {
          return {
              index: 1,
              formDynamic: {
                  items: [
                      {
                          value: '',
                          index: 1,
                          status: 1
                      }
                  ]
              }
          }
      },
      methods: {
          handleSubmit (name) {
              this.$refs[name].validate((valid) => {
                  if (valid) {
                      this.$Message.success('Success!');
                  } else {
                      this.$Message.error('Fail!');
                  }
              })
          },
          handleReset (name) {
              this.$refs[name].resetFields();
          },
          handleAdd () {
              this.index++;
              this.formDynamic.items.push({
                  value: '',
                  index: this.index,
                  status: 1
              });
          },
          handleRemove (index) {
              this.formDynamic.items[index].status = 0;
          },
          validatePassCheck(rule, value, callback) {
            if (value === '') {
              callback(new Error('Please enter your password again'));
            } else if (value.length > 5) {
              callback(new Error('密码长度不能大于5'));
            } else {
              callback();
            }
          }
      }
  }
</script>

运行效果

至此完