实现效果

实现代码

其中virtual-list是使用的插件,使得下拉数据多的时候,不会出现卡顿
正常不使用虚拟列表的时候可以这样写

 <el-dropdown-menu slot="dropdown"><el-dropdown-item v-for="i in item.optionList" :key="i.id" :command="item.valueType == 'id' ? i.id : i.code" class="dropdownMeun"><span :class="getClass(item,i)">{{ i.name }}</span><i v-show="getClass(item,i)" class="iconfont el-icon-tips-done" /></el-dropdown-item></el-dropdown-menu></el-dropdown>

getName方法用来处理选中值的展示方式,根据业务逻辑自行处理

  computed: {getName() {return function(row) {if ((typeof row.value != 'boolean' && !row.value) || !row.optionList) returnif (row.multiple) {const hJson = row.optionList.filter(item => row.value.indexOf(row.valueType == 'id' ? item.id : item.code) !== -1)return hJson?.map(r => r.name)?.join(' 、')} else if (row.valueType == 'id') {const name = row.optionList.find(j => j.id == row.value)?.namereturn name} else {const name = row.optionList.find(j => j.code == row.value)?.namereturn name}}},

实现多选的关键代码

多选选中样式,代码

  computed: {getClass() {return function(row, i) {if (row.valueType == 'id') {if (row.multiple) {return row.value.includes(i.id) ? 'activeNode' : null}return row.value == i.id ? 'activeNode' : null} else {if (row.multiple) {this.$set(i, 'isActive', row.value.includes(i.code))return row.value.includes(i.code) ? 'activeNode' : null}return row.value == i.code ? 'activeNode' : null}}}},

在css里面定义一个activeNode的样式就可以了

.activeNode{// background: #3E7BFA;;color: #3E7BFA;
}