自定义字段组件如何处理vue组件内的表单校验

介绍

本示例以字符串字段为业务场景，将输入框用element-plus的组件实现了一遍，vue组件内在onMounted生命周期内将ElForm表单实例通过ts组件内提供到props的setFormInstance方法设置到了ts组件的属性formInstance上，这样就可以在ts组件校验方法validator()触发的时候直接调用表单组件实例formInstance的校验方法validate()

适用场景

1. 当前字段存储了动态表单的配置json，vue组件内自行实现了一套表单渲染逻辑，需要在vue组件和ts组件内同时触发校验

参考文档

• element-plus表单组件文档
• 如何编写自定义字段组件的校验逻辑

示例代码

ts组件

import {
  BaseFieldWidget,
  FormStringFieldSingleWidget,
  isValidatorSuccess,
  ModelFieldType,
  SPI,
  ValidatorInfo,
  ViewType,
  Widget
} from '@kunlun/dependencies';
import { FormInstance } from 'element-plus';
import MyFormStringField from './MyFormStringField.vue';

@SPI.ClassFactory(
  BaseFieldWidget.Token({
    viewType: [ViewType.Form, ViewType.Search],
    ttype: ModelFieldType.String,
    widget: 'Input',
    model: 'resource.k2.Model0000000109',
    name: 'code',
  })
)
export class MyFormStringFieldWidget extends FormStringFieldSingleWidget {

  public initialize(props) {
    super.initialize(props);
    this.setComponent(MyFormStringField);
    return this;
  }

  /**
   * ElementPlus的表单vue组件实例
   * @private
   */
  private formInstance?: FormInstance;

  @Widget.Method()
  private setFormInstance(formInstance: FormInstance | undefined) {
    this.formInstance = formInstance;
  }

  /**
   * 字段校验方法
   */
  public async validator(): Promise<ValidatorInfo> {
    const validRes = await this.formInstance?.validate((valid, fields) => {});
    console.log('validRes', validRes)
    if (!validRes) {
      return this.validatorError('校验失败');
    }

    const res = await super.validator();
    if (!isValidatorSuccess(res)) {
      return res;
    }
    if (this.value == null) {
      return this.validatorSuccess();
    }
    return this.validateLength(this.value);
  }

}

vue组件

<template>
  <ElForm ref="formInstance" :model="model" :rules="rules">
    <ElFormItem label="编码" prop="code">
      <ElInput v-model="model.code" @input="onValueChange"></ElInput>
    </ElFormItem>
  </ElForm>
</template>
<script lang="ts">
import { defineComponent, reactive, ref, onMounted, watch } from 'vue';
import { ElForm, ElFormItem, ElInput, FormInstance } from 'element-plus';

export default defineComponent({
  name: 'MyFormStringField',
  components: {
    ElForm,
    ElFormItem,
    ElInput
  },
  props: ['value', 'setFormInstance', 'onChange'],
  setup(props) {
    const formInstance = ref<FormInstance>();
    const model = ref({ code: '' });

    const rules = reactive({
      code: [
        { required: true, message: '必填', trigger: 'blur' },
      ]
    });

    function onValueChange() {
      props.onChange?.(model.value.code);
    }

    onMounted(() => {
      props.setFormInstance?.(formInstance.value);
    });

    watch(props.value, () => {
      model.value.code = props.value;
    });

    return {
      formInstance,
      model,
      rules,
      onValueChange
    }
  }
});
</script>

页面校验效果查看