elementUI表单校验动态添加校验规则

elementui动态添加校验规则，场景：

如果活动名称为空，则所有字段非必填

如果活动名称不为空，则具体活动名称提示必填

 

<template>
  <div id="app">
    <el-form ref="form" :model="form" :rules="rules" label-width="80px">
      <el-form-item label="活动名称" prop="name">
        <el-input v-model="form.name" @blur="blur()"></el-input>
      </el-form-item>
      <el-form-item label="具体活动" prop="name1">
        <el-input v-model="form.name1"></el-input>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>
export default {
  name: "app",
  components: {},
  data() {
    return {
      form: {
        name: "",
        name1: "",
      },
      rules: {},
    };
  },
  methods: {
    addRules() {
      // 定义规则
      const newRules = [{ required: true, trigger: "change", message: "具体活动必填" }];
      // 给rules对象添加规则
      this.rules = { ...this.rules, name1: newRules };
    },
    removeRules() {
        // 清除指定校验规则
        this.$refs.form.clearValidate(["name1"]);
      // 这行必须
      this.rules = { ...this.rules, name1: [] };
    },

    blur() {
      if (this.form.name === "") {
        this.removeRules();
      } else {
        this.addRules();
      }
    },
  },
};
</script>

　　效果：

活动名称为空时，具体活动选项非必填

活动名称不为空时，具体活动选项必填