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View Code? Open in Web Editor NEWElementUI级联选择组件的懒加载拓展
Home Page: https://zhuanlan.zhihu.com/p/297914302
ElementUI级联选择组件的懒加载拓展
Home Page: https://zhuanlan.zhihu.com/p/297914302
在单选-远程搜索时候 有使用问题
封装的组件内部调change的时机不对。
通过搜索面板来执行change,这个时候如果获取getCheckedNodes将是null
不过我注意到你在知乎上有回答:
https://zhuanlan.zhihu.com/p/297914302
YanYuanYanYuan回复四哥 (作者)06-22
单选的情况涉及时机的问题,会有几秒的延迟
对此,我稍微改了一下插件
lazy-cascader.vue
<template>
<div class="lazy-cascader" :style="{ width: width }">
<!-- 禁用状态 -->
<div
v-if="disabled"
class="el-input__inner lazy-cascader-input lazy-cascader-input-disabled"
>
<span class="lazy-cascader-placeholder" v-show="placeholderVisible">
{{ placeholder }}
</span>
<div class="lazy-cascader-tags" v-if="props.multiple">
<el-tag
class="lazy-cascader-tag"
type="info"
disable-transitions
v-for="(item, index) in labelArray"
:key="index"
closable
>
<span> {{ item.label.join(separator) }}</span>
</el-tag>
</div>
<div class="lazy-cascader-label" v-else>
<el-tooltip
placement="top-start"
:content="labelObject.label.join(separator)"
>
<span>{{ labelObject.label.join(separator) }}</span>
</el-tooltip>
</div>
</div>
<!-- 禁用状态 -->
<!-- 可选状态 -->
<el-popover v-else trigger="click" placement="bottom-start" ref="popover">
<!-- 搜索 -->
<div class="lazy-cascader-search">
<el-autocomplete
:style="{ width: searchWidth || '100%' }"
:popper-class="suggestionsPopperClass"
v-if="filterable"
class="inline-input"
prefix-icon="el-icon-search"
label="name"
v-model="keyword"
:fetch-suggestions="querySearch"
:trigger-on-focus="false"
placeholder="请输入"
@select="handleSelect"
@blur="isSearchEmpty = false"
>
<template slot-scope="{ item }">
<div class="name" :class="isChecked(item[props.value])">
{{ item[props.label].join(separator) }}
</div>
</template>
</el-autocomplete>
<div class="empty" v-show="isSearchEmpty">{{ searchEmptyText }}</div>
</div>
<!-- 搜索 -->
<!-- 级联面板 -->
<div class="lazy-cascader-panel">
<el-cascader-panel
:ref="`panel${props.type}`"
v-model="current"
:options="options"
:props="currentProps"
@change="change"
></el-cascader-panel>
</div>
<!-- 级联面板 -->
<!--内容区域-->
<div
class="el-input__inner lazy-cascader-input"
:class="disabled ? 'lazy-cascader-input-disabled' : ''"
slot="reference"
>
<span class="lazy-cascader-placeholder" v-show="placeholderVisible">
{{ placeholder }}
</span>
<div class="lazy-cascader-tags" v-if="props.multiple">
<el-tag
class="lazy-cascader-tag"
type="info"
disable-transitions
v-for="(item, index) in labelArray"
:key="index"
closable
@close="handleClose(item)"
>
<span> {{ item.label.join(separator) }}</span>
</el-tag>
</div>
<div class="lazy-cascader-label" v-else>
<el-tooltip
placement="top-start"
:content="labelObject.label.join(separator)"
>
<span>{{
(props.orderbyDesc ? [...labelObject.label].reverse() : labelObject.label).join(separator)
}}</span>
</el-tooltip>
</div>
</div>
<!--内容区域-->
</el-popover>
<!-- 可选状态 -->
</div>
</template>
<script>
export default {
props: {
value: {
type: Array,
default: () => {
return [];
}
},
separator: {
type: String,
default: ' > '
},
placeholder: {
type: String,
default: '请选择'
},
width: {
type: String,
default: '400px'
},
filterable: Boolean,
disabled: Boolean,
props: {
type: Object,
default: () => {
return {};
}
},
suggestionsPopperClass: {
type: String,
default: 'suggestions-popper-class'
},
searchWidth: {
type: String
},
searchEmptyText: {
type: String,
default: '暂无数据'
}
},
data() {
return {
singleHandleSelect: false, //用于解决插件延时bug
isSearchEmpty: false,
keyword: '',
closeHandleSelect: 4000,
options: [],
current: [],
labelObject: {label: [], value: []},
labelArray: [],
currentProps: {
multiple: this.props.multiple,
checkStrictly: this.props.checkStrictly,
value: this.props.value,
label: this.props.label,
leaf: this.props.leaf,
lazy: true,
lazyLoad: this.lazyLoad
}
};
},
computed: {
placeholderVisible() {
if (this.current) {
return this.current.length === 0;
} else {
return true;
}
}
},
watch: {
async current() {
await this.getLabelArray();
// 异步完成,再通知change事件
if(this.singleHandleSelect){
this.change();
this.singleHandleSelect = false;
}
},
value(v) {
this.current = v;
},
keyword() {
this.isSearchEmpty = false;
}
},
created() {
this.initOptions();
},
methods: {
//搜索是否选中
isChecked(value) {
//多选
if (this.props.multiple) {
let index = this.current.findIndex(item => {
return item.join() === value.join();
});
if (index > -1) {
return 'el-link el-link--primary';
} else {
return '';
}
} else {
if (value.join() === this.current.join()) {
return 'el-link el-link--primary';
} else {
return '';
}
}
},
//搜索
querySearch(query, callback) {
this.props.lazySearch(query, list => {
// console.log('list', list);
callback(list);
if (!list || !list.length) this.isSearchEmpty = true;
}, this.props.type);
},
//选中搜索下拉搜索项
handleSelect(item) {
if (this.props.multiple) {
// console.log('multiple', item);
let index = this.current.findIndex(obj => {
return obj.join() === item[this.props.value].join();
});
if (index === -1) {
this.$refs[`panel${this.props.type}`].clearCheckedNodes();
this.current.push(item[this.props.value]);
// setTimeout(() => {
// this.change();
// }, this.closeHandleSelect);
this.singleHandleSelect = true;
}
} else {
// console.log('single', item);
//选中下拉选变更值
// console.log(item,this.current);
if (
this.current == null ||
item[this.props.value].join() !== this.current.join()
) {
this.$refs[`panel${this.props.type}`].activePath = [];
this.current = item[this.props.value];
// setTimeout(() => {
// this.change();
// }, this.closeHandleSelect);
this.singleHandleSelect = true;
}
}
console.log('handleSelect');
this.keyword = '';
},
//初始化数据
async initOptions() {
this.props.lazyLoad(0, list => {
this.$set(this, 'options', list);
if (this.props.multiple) {
this.current = [...this.value];
} else {
this.current = this.value;
}
}, this.props.type);
},
async getLabelArray() {
if (this.props.multiple) {
let array = [];
for (let i = 0; i < this.current.length; i++) {
let obj = await this.getObject(this.current[i]);
array.push(obj);
}
this.labelArray = array;
this.$emit('input', this.current);
if (!this.disabled) {
this.$nextTick(() => {
this.$refs.popover.updatePopper();
});
}
} else {
this.labelObject = await this.getObject(this.current || []);
this.$emit('input', this.current);
}
},
/**格式化id=>object */
async getObject(id) {
try {
let options = this.options;
let nameArray = [];
for (let i = 0; i < id.length; i++) {
let index = options.findIndex(item => {
return item[this.props.value] === id[i];
});
nameArray.push(options[index][this.props.label]);
if (i < id.length - 1 && options[index].children == undefined) {
let list = new Promise(resolve => {
this.props.lazyLoad(id[i], list => {
resolve(list);
}, this.props.type);
}, this.props.type);
this.$set(options[index], 'children', await list);
options = options[index].children;
} else {
options = options[index].children;
}
}
return {value: id, label: nameArray};
} catch (e) {
this.current = [];
return {value: [], label: []};
}
},
//懒加载数据
async lazyLoad(node, resolve) {
console.log('lazyLoad');
let current = this.current;
if (this.props.multiple) {
current = [...this.current];
}
if (node.root) {
resolve();
} else if (node.data[this.props.leaf]) {
resolve();
} else if (node.data.children) {
if (this.props.multiple) {
this.current = current;
}
resolve();
} else {
this.props.lazyLoad(node.value, list => {
node.data.children = list;
if (this.props.multiple) {
this.current = current;
}
resolve(list);
}, this.props.type);
}
},
//删除多选值
/**删除**/
handleClose(item) {
let index = this.current.findIndex(obj => {
return obj.join() == item.value.join();
});
if (index > -1) {
this.$refs[`panel${this.props.type}`].clearCheckedNodes();
this.current.splice(index, 1);
this.$emit('change', this.current);
}
},
change() {
console.log(88888888);
this.$emit('change', this.current);
this.$refs.popover.doClose();
}
}
};
</script>
<style lang="less">
.lazy-cascader {
display: inline-block;
width: 300px;
.lazy-cascader-input {
width: 100%;
background: #fff;
height: auto;
min-height: 36px;
padding: 5px;
line-height: 1;
cursor: pointer;
> .lazy-cascader-placeholder {
padding: 0 2px;
line-height: 28px;
color: #999;
font-size: 14px;
}
> .lazy-cascader-label {
padding: 0 2px;
line-height: 28px;
color: #606266;
font-size: 14px;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
}
.lazy-cascader-input-disabled {
background-color: #f5f7fa;
border-color: #e4e7ed;
color: #c0c4cc;
cursor: not-allowed;
> .lazy-cascader-label {
color: #c0c4cc;
}
> .lazy-cascader-placeholder {
color: #c0c4cc;
}
}
}
.lazy-cascader-tag {
display: inline-flex;
align-items: center;
max-width: 100%;
margin: 2px;
text-overflow: ellipsis;
background: #f0f2f5;
> span {
flex: 1;
overflow: hidden;
text-overflow: ellipsis;
}
> .el-icon-close {
-webkit-box-flex: 0;
-ms-flex: none;
flex: none;
background-color: #c0c4cc;
color: #fff;
}
}
.lazy-cascader-panel {
margin-top: 10px;
display: inline-block;
}
.suggestions-popper-class {
width: auto !important;
min-width: 200px;
}
.lazy-cascader-search {
.empty {
width: calc(100% - 24px);
box-sizing: border-box;
background-color: #fff;
color: #999;
text-align: center;
position: absolute;
z-index: 999;
padding: 12px 0;
margin-top: 12px;
box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
&:before {
content: "";
position: absolute;
top: -12px;
left: 36px;
width: 0;
height: 0;
border-left: 6px solid transparent;
border-right: 6px solid transparent;
border-top: 6px solid transparent;
border-bottom: 6px solid #fff;
filter: drop-shadow(0 -1px 2px rgba(0, 0, 0, .02));
}
}
}
</style>
app.vue
<template>
<div id="app">
<lazy-cascader ref="lzc" filterable :props="lazyCascaderProps" @change="lazyCascaderChange" v-model="result"/>
<el-button type="primary" @click="save">确 定</el-button>
</div>
</template>
<script>
import LazyCascader from "./components/lazy-cascader.vue";
import { api } from "./utils/common";
export default {
name: "App",
components: {
LazyCascader,
},
data: () => ({
dialogVisible:false,
result:[],
lazyCascaderProps: {
orderbyDesc: true,
multiple: false,
checkStrictly: false,
value: "id",
label: "name",
type: 1,
lazyLoad: async (nodeValue, resolve, type) => {
const params = {
type,
organId: nodeValue,
parentId: nodeValue,
};
const res = await api.getOrgAndPerson(params);
resolve(res);
},
lazySearch: (queryString, callback, type) => {
const params = {
type,
judgeName: queryString,
};
api.findOrgByJudgeName(params).then((data) => {
callback(data);
});
},
},
}),
methods: {
save(){
console.log(JSON.stringify(this.result));
this.dialogVisible = false;
},
lazyCascaderChange(val){
const node = this.$refs.lzc.$refs.panel1.getCheckedNodes()[0];
const transferJudge = {};
transferJudge.transferJudgeId = node?.data.id ?? '';
transferJudge.transferJudgeDepartment = node?.parent?.data?.id ?? '';
transferJudge.transferJudgeName = node?.data.name;
console.log('transferJudge', transferJudge);
}
},
mounted() {
},
};
</script>
懒加载第一个参数是选中的节点值,而非选中的node节点,导致懒加载如果不是一个接口,无法判断节点位置无法使用!
现在单选状态好像无法清空选中
选中项只显示最后一级
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