ElementUI-Cascader组件同时支持懒加载和选择任意一级 问题踩坑
业务背景:
地址选择,四级联动,可选任意一级,支持懒加载,双击选择
主要代码如下
<el-cascader clearable placeholder="请选择联系地址" @visible-change="visibleChange" class="address-cascader" :key="cascaderKey" v-model="addressIdList" :popper-class="popperClass" :props="props" ref="elCascader" @expand-change="bindEvent" @change="handleChange"></el-cascader>
props: { lazy: true, checkStrictly: true, async lazyLoad(node, resolve) { let nodes = [] const {level, value} = node let results = [] let parentAdminDivId = '' if (level === 0) { parentAdminDivId = '' nodes = await _this.getAddressInfo(adminDivList[level], parentAdminDivId) } else{ // 直辖市特殊处理 if (level === 1 && (_this.specialCityList.includes(value))) { nodes = [{ valueDesc: '市辖区', valueNo: _this.zxCityInfo[node.value], adminDivId: node.data.adminDivId }] } else { parentAdminDivId = node.data.adminDivId nodes = await _this.getAddressInfo(adminDivList[level], parentAdminDivId) } } results = nodes.map(item => ({ label: item.valueDesc, value: _this.specialCityList.includes(value) ? item.valueNo : item.adminDivId, adminDivId: item.adminDivId, leaf: level >= _this.cascaderNum })) resolve(results) } }
如上图有以下问题
1. Cascader自带样式不符合需求标准
2. Cascader设计为点击单选框选择,点击右侧箭头区域加载下一级,不符合交互
3.无法双击选择
样式问题可以自定义css来覆盖,但是交互问题无法解决,翻阅很多资料博客都没有合理的解决方案
后来有天晚上有人托梦给我一个解决方案,经实测,以下方案切实可行
点击 el-cascader-node__label的时候,手动触发radio的点击事件
具体代码如下
bindEvent() {
const _this = this
this.$nextTick(() => {
let cascaderDom = document.getElementsByClassName(_this.refName)[0]
if (cascaderDom) {
setTimeout(() => {
let labelDoms = cascaderDom.querySelectorAll('.el-cascader-node .el-cascader-node__label')
let radioDoms = cascaderDom.querySelectorAll('.el-cascader-node .el-radio__inner')
if (labelDoms && labelDoms.length) {
labelDoms.forEach((item, index) => {
item.addEventListener('click', () => {
radioDoms[index].click()
})
})
labelDoms.forEach((item) => {
item.addEventListener('dblclick', () => {
_this.$refs.elCascader.dropDownVisible = false
})
})
}
}, 500)
}
})
},
核心代码如上,注:bindEvent的调用时间,每次点击出现下一级时候都要为label绑定事件,另外绑定前记得销毁