How to generate a drop-down list using pure js

亚连
Release: 2018-06-12 16:27:22
Original
3207 people have browsed it

Below I will share with you an example of generating a searchable selection drop-down list using pure js code. It has a good reference value and I hope it will be helpful to everyone.

1. Because the original poster cannot write dynamic css, you need to introduce the css style in layui:

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2. You need to introduce the jquery-1.8.3.js version of jquery

Without further ado, the code implementation is as follows:

var selectData={};//下拉列表总数据 /** * 下拉搜索,多选择等 */ $.fn.selectDataFun=function (json) { selectData[$(this).attr("id")]={thisDom:null,initData:null,jsonData:null,htmlText:null, isShow:true,selectElements:true,overStat:true,checkedElementIds:''}; thisSelectFun($(this)).thisDom=$(this);//设置索引为id,值为本身对象 thisSelectFun($(this)).initData=json;//初始数据为json /* var isShow=true;//是否显示 var selectElements;//选择的选项 var overStat=true;//鼠标经过的状态 var checkedElementIds='';//选中项的id*/ //根据字段生成html代码 setFieldTypeFun($(this)); //请求后台数据 getSelectDataFun($(this)); //生成下拉列表 thisSelectFun($(this)).htmlText = createSelectFun($(this));//htmlText为缓存的html代码 //调用总方法 callMethodFun($(this)); } //根据对象id值获取对象数据 function thisSelectFun(thisD) { if(thisD.attr("id")==''){ alert("id值为空"); return null; } return selectData[thisD.attr("id")] } //根据对象字段生成html代码 function setFieldTypeFun(thisD){ var thisId=thisD.attr("id"); var fields = selectData[thisId].initData;//以id获取该对象的所有数据 //生成html代码 var title=fields.title; var inputId=fields.inputId; var selectHtml='

'+'

'+ ''+ ''+title+':'+' '+''+ ''+'

'+'
'+ '

'; thisD.append(selectHtml); } //请求后台数据 function getSelectDataFun(thisD) { var fields = selectData[thisD.attr("id")].initData;//以id获取该对象的所有数据 //判断数据ajaxUrl中是否含有url字段 if(fields.ajaxUrl.hasOwnProperty('url')){ //以请求路径为url请求后台数据,并赋值给jsonData thisSelectFun(thisD).jsonData=ajaxFunss(fields.ajaxUrl); }else { if($.isEmptyObject(thisSelectFun(thisD).jsonData)){ thisSelectFun(thisD).jsonData={ code: 0, msg: "获取成功", count: 0,data:new Array()}; } } } //请求后台数据 function ajaxFunss(json) { json['async']=false; json['dataType']='json'; json['type']='post'; var layerLoadIndex = layer.load(1); //换了种风格 var resultData=$.ajax(json);//发送请求 layer.close(layerLoadIndex); if(resultData.status==200){//请求后台数据成功 return resultData.responseJSON; }else { return null; } } //生成下拉列表 function createSelectFun(thisD) { var json=thisSelectFun(thisD).jsonData; var html=''; for(var n in json){ html+='
'+json[n].name+'
'; } var id=thisD.attr("id")+'dl'; $("#"+id).append(html); return html; } //调用总方法 function callMethodFun(thisD) { var iDom=thisD.find(".layui-edge").eq(0);//i元素,eq为等于的意思 var pDom = thisD.find(".layui-form-select").eq(0);//下拉列表所在的p /* var isShow = thisSelectFun(thisD).isShow;//是否显示 var selectElement = thisSelectFun(thisD).selectElements;//选中的选项 var overStat = thisSelectFun(thisD).overStat;//鼠标经过和离开状态 var checkedElementIds = thisSelectFun(thisD).checkedElementIds;//隐藏输入框的value值*/ //小三角符号绑定点击方法 iDom.click(function () { if(thisSelectFun(thisD).isShow){ thisSelectFun(thisD).isShow=false; pDom.addClass("layui-form-selected");//显示下拉列表 }else { thisSelectFun(thisD).isShow=true; pDom.attr("class","layui-form-select");//隐藏下拉列表 } }); //dl元素绑定点击方法 var dlDom=thisD.find("dl").eq(0); var searchId = thisD.attr("id")+'Search';//搜索框id dlDom.on("click",'dd',function () { if(thisSelectFun(thisD).initData.selectType) { //多选 if (thisSelectFun(thisD).selectElements) { thisSelectFun(thisD).selectElements = false; $(this).addClass("layui-this");//设置勾选状态 var text = $("#" + searchId).val();//输入框的内容 var selectText = $(this).text() + ",";//选择的选项 var checkedId = $(this).attr("lay-value") + ",";//获取选项的id if (text.indexOf(selectText) != -1) {//判断输入框中的内容是否包含有所选的选项 return; } thisSelectFun(thisD).checkedElementIds += checkedId; $("#" + searchId).val(text + selectText); } else { thisSelectFun(thisD).selectElements = true; $(this).attr("class", "");//清空勾选状态 var val = $(this).text() + ",";//勾选的选项 var checkedId = $(this).attr("lay-value") + ',';//获取选项的id var text = $("#" + searchId).val().replace(val, "");//清除勾选的选项 $("#" + searchId).val(text);//设置 thisSelectFun(thisD).checkedElementIds = thisSelectFun(thisD).checkedElementIds.replace(checkedId, "");//清除勾选的选项 } }else { //单选 //获取已经选中的选项,并清除 var ddDom=thisD.find(".layui-this").eq(0); ddDom.attr("class","");//清除 $(this).addClass("layui-this");//设置勾选状态 var selectText = $(this).text();//选择的选项 var checkedId = $(this).attr("lay-value");//获取选项的id thisSelectFun(thisD).checkedElementIds = checkedId; $("#" + searchId).val(selectText); pDom.attr("class","layui-form-select");//隐藏下拉列表 } var hiddenId=selectData[thisD.attr("id")].initData.inputId;//隐藏输入框id $("#"+hiddenId).val(thisSelectFun(thisD).checkedElementIds.substring(0,thisSelectFun(thisD).checkedElementIds.length-1)); }) //鼠标经过时 dlDom.mouseover(function () { thisSelectFun(thisD).overStat=false; }); //鼠标离开时 dlDom.mouseout(function () { thisSelectFun(thisD).overStat=true; }); //鼠标松开时 $("body").mouseup(function () { if(thisSelectFun(thisD).overStat==true){//并且overStat为true pDom.attr("class","layui-form-select");//隐藏下拉列表 } }); //搜索框键盘松开事件 var searchDom = thisD.find("#"+searchId).eq(0);//搜索框对象 searchDom.keyup(function () { searchFunssss(thisD,searchId,pDom,dlDom); }); } //根据输入内容搜索出匹配的选项 function searchFunssss(thisD,searchId,pDom,dlDom) { var val=$("#"+searchId).val();//搜索框id if(val.length>0){ var conText='';//符合条件的选项 var searchStats=false;//是否搜索到 var htmlText=thisSelectFun(thisD).htmlText;//缓存的html代码 dlDom.children().each(function () { var thisText=$(this).text(); var thisDom='
'+thisText+'
'; if(val==thisText){ conText+=thisDom; htmlText=htmlText.replace(thisDom,""); searchStats=true; var searchId = thisD.attr("id")+'Search';//搜索框id $("#"+searchId).val("");//清空搜索框 } }); htmlText=conText+htmlText; dlDom.children().remove();//删除其子节点 dlDom.append(htmlText); if(searchStats){ pDom.addClass("layui-form-selected");//显示下拉列表 } } }
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The above js code is placed in a js file named selectFun.js

The call is as follows:

<%@ page contentType="text/html;charset=UTF-8" %> <%@ include file="/webpage/include/taglib.jsp"%>test
         
         

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The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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