点击＋号，增加form表单的子级应该怎么做能实现？

Question

上面的图片是ui图，这是一个编辑弹窗里面的功能，用的是vue2+element ui
在入参字段下面的表单，点击右侧的加号就能添加一个子级，总共能有三级。点击减号能删除当前的子级。
这七个表单的布局，是应该写七个form-item，还是在一个form-item下面写七个input，哪个好一点呢。
请问这样的添加表单的子级应该怎么实现呢？ 求指导 求指导

Answer 1

组件

<!-- formRow.vue -->
<template>
  <div>
    <div class="form-row">
      <el-form-item label="用户名">
        <el-input
          v-model="value.userName"
          placeholder="请输入用户名"
        ></el-input>
      </el-form-item>
      <el-form-item label="密码">
        <el-input
          v-model="value.password"
          placeholder="请输入密码"
        ></el-input>
      </el-form-item>
      <el-button @click="addChildren(value)"> 添加 </el-button>
      <el-button @click="deleteRow(value)"> 删除 </el-button>
    </div>
    <div style="margin-left: 20px">
      <template v-for="(item, index) in value.children">
        <form-row
          v-model="value.children[index]"
          :key="index"
          :index="index"
          @removeRow="removeRow"
        ></form-row>
      </template>
    </div>
  </div>
</template>

<script>
export default {
  name: "form-row",
  model: {
    prop: "value",
    event: "change",
  },
  props: {
    value: {
      type: Object,
      default: () => [],
    },
    index: {
      type: Number,
      default: 0,
    },
  },
  watch: {
    value: {
      handler(val) {
        this.$emit("change", val);
      },
      deep: true,
    },
  },
  methods: {
    // 添加子级
    addChildren() {
      if (!this.value.children) {
        this.$set(this.value, "children", [{ userName: "" }]);
      } else {
        this.value.children.push({
          userName: "",
          password: ""
        });
      }
    },
    // 删除该行表单
    deleteRow() {
      // 抛出事件到父级执行
      this.$emit("removeRow", this.index);
    },
    // 删除子级
    removeRow(index) {
      if (this.value?.children[index]?.children?.length > 0) {
        alert('请先删除子级')
      } else {
        this.value.children.splice(index, 1);
      }
    },
  },
};
</script>

<style>
.form-row {
  display: flex;
  margin-bottom: 10px;
}
.form-row .el-button {
  height: 40px;
  margin-left: 10px;
}
</style>

使用

<template>
  <div id="app">
    <el-form label-width="80px">
      <template v-for="(item, index) in formArray">
        <formRowVue
          v-model="formArray[index]"
          :key="index"
          :index="index"
          @removeItem="removeItem"
        ></formRowVue>
      </template>
    </el-form>
  </div>
</template>
<script>
import formRowVue from './views/formRow.vue';
export default {
  name: "myform",
  components: {
    formRowVue
  },
  data() {
    return {
      formArray: [
        {
          userName: "张三",
          password: '123456',
          children: [{ userName: "张三1", password: '123456' }, { userName: "张三2", password: '123456' }],
        },
      ]
    }
  },
  methods: {
    removeItem(index) {
      if (this.formArray[index]?.children?.length > 0) {
        alert('请先删除子级')
      } else {
        this.formArray.splice(index, 1);
      }
    }
  },
};
</script>


<style lang="less">
</style>

Answer 2

七个form-item吧，往数组里面push呗