1，el-autocomplete 是可带输入建议的输入框组件
基本使用是：
<el-autocomplete
class="inline-input"
v-model="state1"
:fetch-suggestions="querySearch"
placeholder="请输入内容"
@select="handleSelect"
></el-autocomplete>fetch-suggestions 是一个返回输入建议的方法属性，如 querySearch(queryString, cb)，在该方法中你可以在你的输入建议数据准备好时通过 cb(data) 返回到 autocomplete 组件中。
该方法一般模式
querySearch(queryString, cb) {
var restaurants = this.restaurants;
var results = queryString ? restaurants.filter(this.createFilter(queryString)) : restaurants;
// 调用 callback 返回建议列表的数据
cb(results);
},
createFilter(queryString) {
return (restaurant) => {
return (restaurant.value.toLowerCase().indexOf(queryString.toLowerCase()) === 0);
};
},其中restaurants是带有value属性的对象数组，如下：
[
{ "value": "三全鲜食（北新泾店）", "address": "长宁区新渔路144号" },
{ "value": "Hot honey 首尔炸鸡（仙霞路）", "address": "上海市长宁区淞虹路661号" },
{ "value": "新旺角茶餐厅", "address": "上海市普陀区真北路988号创邑金沙谷6号楼113" },
{ "value": "泷千家(天山西路店)", "address": "天山西路438号" },
{ "value": "胖仙女纸杯蛋糕（上海凌空店）", "address": "上海市长宁区金钟路968号1幢18号楼一层商铺18-101" },
{ "value": "贡茶", "address": "上海市长宁区金钟路633号" },
{ "value": "豪大大香鸡排超级奶爸", "address": "上海市嘉定区曹安公路曹安路1685号" },
{ "value": "茶芝兰（奶茶，手抓饼）", "address": "上海市普陀区同普路1435号" },
{ "value": "十二泷町", "address": "上海市北翟路1444弄81号B幢-107" },
{ "value": "星移浓缩咖啡", "address": "上海市嘉定区新郁路817号" },
{ "value": "阿姨奶茶/豪大大", "address": "嘉定区曹安路1611号" },
{ "value": "新麦甜四季甜品炸鸡", "address": "嘉定区曹安公路2383弄55号" },
{ "value": "Monica摩托主题咖啡店", "address": "嘉定区江桥镇曹安公路2409号1F，2383弄62号1F" },
{ "value": "浮生若茶（凌空soho店）", "address": "上海长宁区金钟路968号9号楼地下一层" },
{ "value": "NONO JUICE 鲜榨果汁", "address": "上海市长宁区天山西路119号" },
{ "value": "CoCo都可(北新泾店）", "address": "上海市长宁区仙霞西路" },
{ "value": "快乐柠檬（神州智慧店）", "address": "上海市长宁区天山西路567号1层R117号店铺" },
{ "value": "Merci Paul cafe", "address": "上海市普陀区光复西路丹巴路28弄6号楼819" },
{ "value": "猫山王（西郊百联店）", "address": "上海市长宁区仙霞西路88号第一层G05-F01-1-306" },
{ "value": "枪会山", "address": "上海市普陀区棕榈路" },
{ "value": "纵食", "address": "元丰天山花园(东门) 双流路267号" },
{ "value": "钱记", "address": "上海市长宁区天山西路" },
{ "value": "壹杯加", "address": "上海市长宁区通协路" },
{ "value": "唦哇嘀咖", "address": "上海市长宁区新泾镇金钟路999号2幢（B幢）第01层第1-02A单元" },
{ "value": "爱茜茜里(西郊百联)", "address": "长宁区仙霞西路88号1305室" },
{ "value": "爱茜茜里(近铁广场)", "address": "上海市普陀区真北路818号近铁城市广场北区地下二楼N-B2-O2-C商铺" },
{ "value": "鲜果榨汁（金沙江路和美广店）", "address": "普陀区金沙江路2239号金沙和美广场B1-10-6" },
{ "value": "开心丽果（缤谷店）", "address": "上海市长宁区威宁路天山路341号" },
{ "value": "超级鸡车（丰庄路店）", "address": "上海市嘉定区丰庄路240号" },
{ "value": "妙生活果园（北新泾店）", "address": "长宁区新渔路144号" },
{ "value": "香宜度麻辣香锅", "address": "长宁区淞虹路148号" },
{ "value": "凡仔汉堡（老真北路店）", "address": "上海市普陀区老真北路160号" },
{ "value": "港式小铺", "address": "上海市长宁区金钟路968号15楼15-105室" },
{ "value": "蜀香源麻辣香锅（剑河路店）", "address": "剑河路443-1" },
{ "value": "北京饺子馆", "address": "长宁区北新泾街道天山西路490-1号" },
{ "value": "饭典*新简餐（凌空SOHO店）", "address": "上海市长宁区金钟路968号9号楼地下一层9-83室" },
{ "value": "焦耳·川式快餐（金钟路店）", "address": "上海市金钟路633号地下一层甲部" },
{ "value": "动力鸡车", "address": "长宁区仙霞西路299弄3号101B" },
{ "value": "浏阳蒸菜", "address": "天山西路430号" },
{ "value": "四海游龙（天山西路店）", "address": "上海市长宁区天山西路" },
{ "value": "樱花食堂（凌空店）", "address": "上海市长宁区金钟路968号15楼15-105室" },
{ "value": "壹分米客家传统调制米粉(天山店)", "address": "天山西路428号" },
{ "value": "福荣祥烧腊（平溪路店）", "address": "上海市长宁区协和路福泉路255弄57-73号" },
{ "value": "速记黄焖鸡米饭", "address": "上海市长宁区北新泾街道金钟路180号1层01号摊位" },
{ "value": "红辣椒麻辣烫", "address": "上海市长宁区天山西路492号" },
{ "value": "(小杨生煎)西郊百联餐厅", "address": "长宁区仙霞西路88号百联2楼" },
{ "value": "阳阳麻辣烫", "address": "天山西路389号" },
{ "value": "南拳妈妈龙虾盖浇饭", "address": "普陀区金沙江路1699号鑫乐惠美食广场A13" }
];2，使用实践
<el-select v-model="oper_type" placeholder="请选择" @change="get_item_list">
<template v-for="(pitem,index) in ParaOperateTypeList">
<el-option :key="pitem[1]" :label="pitem[0]" :value="pitem[1]"></el-option>
</template>
</el-select>
<el-autocomplete
class="inline-input"
v-model="param_name"
:fetch-suggestions="querySearchItem"
placeholder="请先选择"
@change="reset_env"
@select="handleSelect"
style="width:100%"
></el-autocomplete>el-select根据选择的oper_type不同值,get_item_list方法根据请求后端API获取该oper_type的item_list，el-autocomplete进而给出不同的请求建议。
querySearchItem(queryString, cb) {
var item_list=this.item_list;
var results = queryString ?
item_list.filter(this.createFilter(queryString)) : item_list;
// 调用 callback 返回建议列表的数据
cb(results);
},
createFilter(queryString) {
return (ele) => {
return
(ele.value.toLowerCase().indexOf(queryString.toLowerCase()) === 0);
};
},此情景下，有个bug:
当this.item_list是请求后端API实时取得的时候，el-select选择完oper_type后因为请求时间问题，立马去点击el-autocomplete后无法及时更新this.item_list导致给出的是旧oper_type的item_list
为了解决此问题，可以这样：
设置一个变量：type_data 表示请求的数据是哪个oper_type的。若是oper_type和type_data 不一致，则重新请求后端数据
所以el-autocomplete组件的fetch-suggestions属性的querySearchItem方法是如下：
querySearchItem_inner(queryString, cb) {
var item_list=this.item_list;
var results = queryString ? item_list.filter(this.createFilter(queryString)) : item_list;
// 调用 callback 返回建议列表的数据
cb(results);
},
querySearchItem(queryString, cb) {
if(this.type_data!=this.oper_type){
this.get_module_items(this.querySearchItem_inner,queryString, cb)
}else{
this.querySearchItem_inner(queryString, cb)
}
},
createFilter(queryString) {
return (ele) => {
return (ele.value.toLowerCase().indexOf(queryString.toLowerCase()) === 0);
};
},
get_items(inner_func,queryString, cb){
if(this.oper_type){
let para={
"oper_type":this.oper_type,
}
axios.get("/upgrade/get_items_for_type",{params:para}).then(res =>{
if(res.status==200){
if(res.data.data){
this.item_list = res.data.data
this.type_data=this.oper_type
if(inner_func){
inner_func(queryString, cb)
}
}
}
})
}
},基于此，基本实现根据选择的类型，给出输入正确的输入建议