vue3+vant 实现树状多选组件

需求描述
效果图
代码
- 父组件引用
- selectTree组件
tree组件
- 数据格式

需求描述

在这里插入图片描述

移动端需要复刻Pc端如上图的功能组件，但vant无组件可用，所以自己封装一个。

效果图

在这里插入图片描述

代码

父组件引用

import TreeSelect from "/selectTree.vue"

  <treeSelect
    ref="treeSelectRef"
    v-model:show="showAera"
    :modelValue="modelValue"
    :listData="options"
    :multiple='true'
    placeholder="请选择"
    @changeModelValue="changeModelValue"
  ></treeSelect>

selectTree组件

<template>
  <van-popup v-model:show="showPicker" round position="bottom"  @click-overlay="onClickOverlay" >
    <div class="tree-box">
      <div class="tree-container">
        <div class="tree-data">
          <TreeSelect
            ref="treeSelectRef"
            :list="data.list"
            :listObj="data.listObj"
            @confirm="onConfirm"
          ></TreeSelect>
        </div>
      </div>
    </div>

    <div class="tree-confirm">
      <van-button type="primary" block @click="handleConfirm">确定</van-button>
    </div>
  </van-popup>
</template>
 
<script setup>
import { reactive, watch, ref, nextTick, onMounted } from "vue";
import TreeSelect from "./tree.vue";
import { showLoadingToast, closeToast } from "vant";

const emits = defineEmits(["changeModelValue", "update:show", "confirm"]);
const props = defineProps({
  show: {
    type: Boolean,
    default: false,
  },
  // 绑定值
  modelValue: {
    type: Array,
     default() {
      return [];
    },
  },
  listData: {
    type: Array,
    default() {
      return [];
    },
  },
});

watch(
  () => props.show,
  () => {
    showPicker.value = props.show;
    initData(props.listData);
  }
);

const showPicker = ref(props.show);
const data = reactive({
  list: props.listData, // 树数组
  listObj: {}, // 数组对象
  selectList: [], // 选中的数据
  canCheckList: [], // 能够选择的数据集合
  canCheckListFixed: [], // 固定的能够选择的数据集合
});

const treeSelectRef = ref(null);

const init = (type) => {
  data.canCheckList = [];
  data.canCheckListFixed = [];
};
const initData = (options) => {
  if (options && options.length) {
    options[0].first=true
    data.list = options;
    init();
    data.listObj = setListObj(options);
  }
};

// 将树形数据转为扁平对象
const setListObj = (list) => {
  let listObj = {};
  list.forEach((itm) => {
    if(props.modelValue&&props.modelValue.indexOf(itm.id)!==-1){
       itm.checked=true
    }
    data.canCheckList.push(itm);
    data.canCheckListFixed.push(itm);
    listObj[itm.id] = itm;
    if (itm.children && itm.children.length) {
      listObj = {
        ...listObj,
        ...setListObj(itm.children),
      };
    }
  });

  return listObj;
};

const onClickOverlay = () => {
  emits("update:show", false);
};
// 确认
const handleConfirm = () => {
  emits("changeModelValue", data.selectList);
  emits("update:show", false);
};

const onConfirm = (e) => {
  const showSelectList = filterData(e);
  data.selectList = showSelectList.map((itm) => itm.id);
};

// 过滤数据
const filterData = (selectList) => {
  // 过滤出展示中，且打勾的数据
  const showSelectList = selectList.filter((itm) => {
    return !itm.isHide && !itm.isShowChildren;
  });
  return showSelectList;
};

const sendWordShow = ref(false);

defineExpose({
  init,
  setListObj,
});
</script>
 
<style lang="less" scoped>
.tree-box {
  --van-search-content-background-color: #eeeeee;
  --van-search-content-background: #eeeeee;
}

.tree-container {
  width: 100%;
  padding: 32px 32px 0;
}

.tree-data {
  height: 60vh;
  overflow-y: auto;
}

.tree-btns {
  width: 100%;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
}

.tree-confirm {
  width: 100%;
  padding: 12px 32px;
}
</style>

tree组件

<template>
  <div class="list">
    <div class="item" v-for="item in props.list" :key="item.key" v-show="!item.isHide">
      <div class="title">
        <div class="checkbox-box">
          <van-checkbox  icon-size="16px" shape="square" @click.stop="checkChange(item)" v-model="item.checked"><span style="font-size: 15px;">{{ item.name}}</span></van-checkbox>
        </div>
        <div @click.stop="itemClick(item)" :class="item.first?'arrow':'arrowlast'">
            <van-icon v-if="item.children && item.children.length" :name="item.isShowChildren ? 'arrow-up' : 'arrow-down'" />
        </div>
        
      </div>
      <div class="tree" v-show="item.first||item.isShowChildren">
        <tree  
         :isLink="data.isLink"
          v-if="item.children && item.children.length" 
          :list="item.children" 
          :listObj="props.listObj"
          :isFirstFloor="false" 
          :multiple="data.multiple" 
          @confirm="onConfirm" 
          :defaultId="defaultId">
        </tree>
      </div>
    </div>
  </div>
</template>
<script setup>
import { reactive, watch } from 'vue'
import tree from './tree.vue'
const emits = defineEmits(["change","confirm"])
const props = defineProps({

  // 是否是第一层
  isFirstFloor: {
    type: Boolean,
    default() {
      return true;
    },
  },
  // 树形结构
  list: {
    type: Array,
    default() {
      return [];
    },
  },
  // 树形扁平化数据
  listObj: {
    type: Object,
    default() {
      return {};
    },
  },
  // 单选默认值
  defaultId : String
})

 
const data = reactive({
  firstLoad: true,
  checkboxValue1: [],
  showList: [],
  isLink:true,
  multiple:true,
  isOutData: true, // 需要将数据抛出
})
 
watch(() => props.list, () => {
  if (data.firstLoad) {
    outDataBuffer();
    data.firstLoad = false;
  }
  // 判断 是第一层树 且 不是进行显示隐藏操作时，进行数据的抛出
  if (props.isFirstFloor && data.isOutData) {
    if(data.multiple){
      outCheckedData();
    }
  }
}, { deep: true })
 
// 展开
const itemClick = (item) => {
  outDataBuffer();
  item.isShowChildren = !item.isShowChildren
  
}
// 数据抛出缓冲（在list数据变化时，不想抛出选择的数据时，调用该方法）
const outDataBuffer = () => {
  data.isOutData = false;
  setTimeout(() => {
    data.isOutData = true;
  }, 500);
}
// 获取选中对象
const getCheckData = (list) => {
  let deptList = [];
  list.forEach((itm) => {
    if (itm.checked) {
      deptList.push(itm);
    }
    if (itm.children && itm.children.length) {
      deptList = deptList.concat(getCheckData(itm.children));
    }
  });
  return deptList;
}
// 单项checked改变
const checkChange = (item) => {

  // 多选
  if (data.multiple) {
    // item.checked = !item.checked
    if (data.isLink) {
      // 展开所有可以展开的节点
      if (item.checked) {
          expandAll(item);
      }
      // 判断父级是否需要勾选
      checkParent(item);
      // 勾选子级
      if (item.children && item.children.length) {
        checkChidren(item.children, item.checked);
        outCheckedData();
      }
    }
    return
  }
 
  // 单选
  if(item.children && item.children.length) return
  toggleAllSelectData(props.list)
  outCheckedData();

}
 
// 获取全部可选择数据，进行全选/取消
const toggleAllSelectData = (list) => {
  list.forEach((itm) => {
    itm.checked = false
    if (itm.children && itm.children.length) {
      toggleAllSelectData(itm.children)
    }
  });
}
 
// 展开所有可以展开的节点
const expandAll = (item) => {
  if (item.children?.length) {
    item.isShowChildren = true
    item.children.forEach(itm => {
      expandAll(itm);
    })
  }
}
// 判断父级是否需要勾选
const checkParent = (item) => {
  // 父级不存在不再往下走
  if (!props.listObj[item[props.pidKey]]) {
    return;
  }
  let someDataCount = 0; // 同级的相同父级数据量
  let checkedDataCount = 0; // 同级已勾选的数据量
  for (const id in props.listObj) {
    const itm = props.listObj[id];
    if (itm[props.pidKey] === item[props.pidKey] && !itm.isHide) {
      someDataCount++;
      if (itm.checked) {
        checkedDataCount++;
      }
    }
  }
  const isEqual = someDataCount === checkedDataCount;
  if (props.listObj[item[props.pidKey]].checked != isEqual) {
    props.listObj[item[props.pidKey]].checked = isEqual
    checkParent(props.listObj[item[props.pidKey]]);
  }
}
// 根据父级统一取消勾选或勾选
const checkChidren = (list, isChecked) => {
  list.forEach((itm) => {
    itm.checked = isChecked
    if (itm.children && itm.children.length) {
      checkChidren(itm.children, isChecked);
    }
  });
}
// 抛出选中的数据
const outCheckedData = () => {
  const checkedList = getCheckData(props.list);
  emits("change", checkedList);
  onConfirm(checkedList)
}
 
const onConfirm = (e) => {
  emits("confirm", e);
}
 
defineExpose({
  itemClick,
  outDataBuffer,
  getCheckData,
  checkChange,
  expandAll,
  checkParent,
  checkChidren,
  outCheckedData,

})
</script>
 
<style lang="less" scoped>
 
.list {
  .item {
    margin-bottom: 10px;
 
    .title {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 10px;
 
      .checkbox-box {
        display: flex;
        align-items: center;
        cursor: pointer;
        padding: 10px 0;
      }
 
      .arrow{
        width: 80px;
        display: flex;
        justify-content: flex-end;
      }
    }
 
    .tree {
      margin-left: 50px;
    }
  }
    .arrow{
    display: none !important;
   }
}
</style>

数据格式

[
    {
        "name": "1",
        "key": 0,
        "children": [
            {
                "name": "2",
                "key": 1,
                "children": []
            },
            {
                "name": "3",
                "key": 1,
                "children": [
                   {
                     "name": "4",
                     "key": 3,
                     "children": []
                   }
                ]
            }
        ]
    }
]