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自定義多選下拉框效果

更新時間：2017年06月19日 09:25:47 作者：迷惘卻堅定

這篇文章主要為大家詳細介紹了自定義多選下拉框效果，具有一定的參考價值，感興趣的小伙伴們可以參考一下

項目中需要自定義一個下拉框多選插件，業務問題還是自己實現比較好

通過$.fn 向添加新的方法

下拉數據通過參數傳遞進去jquery下拉框中實現多選功能，通過調用該插件時接收，選擇后的確定與取消事件采用事件傳遞方式

代碼如下：

1.效果圖

2.代碼

.dropdown-container{
 display: block;
 width: 200px;
 height: 30px;
 padding: 0px;
 position: relative;
 margin: 0px auto;
}
.dropdown-display{
 display: block;
 height: 30px;
 position: absolute;
 top: 0;
 width:100%;
 margin: 0px;
 border:1px solid steelblue;
}
.dropdown-display span{
 background: url(../static/choose_down_icon_01.png) no-repeat left 8px;
 display: block;
 height: 25px;
 width: 10px;
 position: absolute;
 right: 5px;
 top: 3px;
}
.dropdown-display input[class='iptdiplay']{
 border: none;
 border-color: transparent;
 background: transparent;
 border-radius: 0px;
 box-shadow: none;
 height: 30px;
 width: 100%;

 margin: 0px;
 box-sizing: border-box;
 box-shadow: none;
 padding-left: 10px;
 padding-right: 18px;
 outline: none;
 cursor: pointer;
 text-overflow: ellipsis;
}
.dropdown-panel {
 position: absolute;
 top: 32px;
 width:100%;
 padding: 0px;
 display: none;
 border-left: 1px solid steelblue;
 border-bottom: 1px solid steelblue;
 border-right: 1px solid steelblue;
}
.dropdown-panel .dropdown-search{
 display: block;
 width: 100%;
 height: 30px;
}
.dropdown-search span{
 background: url(../static/chosen-sprite.png) no-repeat 100% -20px,linear-gradient(#eee 1%,#fff 15%);
 display: block;
 height: 25px;
 width: 20px;
 position: absolute;
 right: 0px;
 top: 3px;
}
.dropdown-search input[class='iptsearch']{
 border: none;
 border-color: transparent;
 background: transparent;
 border-radius: 0px;
 box-shadow: none;
 height: 30px;
 width: 100%;
 margin: 0px;
 box-sizing: border-box;
 box-shadow: none;
 padding-left: 10px;
 outline: none;
}
.dropdown-panel .dd-select{
 display: block;
 width:100%;
 position: relative;
 height: auto;
 margin: 0px;
 padding:0px !important;
 box-sizing: border-box;
 list-style-type: none;
 text-align: left;
 max-height: 300px;
 overflow-y: scroll;
 overflow-x: hidden;
}
.dd-item{
 display: block;
 height: 30px;
 line-height: 30px;
 padding-left: 5px;

 border-bottom: 1px solid steelblue;
 font-size: 13px;
 z-index: 8;
 overflow: hidden;
}
.dd-item .dd-v{
 width: 0px;
 height: 0px;
 display: none;
}
.dd-item .dd-k{
 z-index: 8;
 padding-left: 15px;
}
.dd-item:first-child{
 border-top: 1px solid steelblue;
}
.dd-item:last-child{
 border-bottom: none;
}
.dd-select .on{
 background-color: steelblue\9;
}
.dd-item:hover::before,.dd-item:hover before{
 content:'\2714';
 position: absolute;
 left: 0px;
 color: #79a979
 z-index: 9;
 font-size: 16px;
 padding-right: 3px;
 padding-left: 2px;
 background-color: #fff;
}
.dd-select .on::before,.dd-select .on before{
 content:'\2714';
 position: absolute;
 left: 0px;
 color: green;
 z-index: 9;
 font-size: 16px;
 padding-right: 3px;
 padding-left: 2px;
 background-color: #fff;
}
.dd-item:hover{
 cursor: pointer;
 background-color: #ccc;
}
.dropdown-container .dropdown-opt{
 width:100%;
 text-align: center;
 position: absolute;
 left: -1px;
 bottom: -30px;
 padding: 0px;
 border-left: 1px solid steelblue;
 border-bottom: 1px solid steelblue;
 border-right: 1px solid steelblue;
 box-sizing: content-box;
}
.dropdown-container .dd-btn{
 color: #333;
 height: 28px !important;
 display: inline-block;
 background-color: #e6e6e6;
 border-color: #adadad;

 user-select: none;
 background-image: none;
 border: 1px solid transparent;
 border-radius: 4px;
 margin: 0px 15px;
}
.dropdown-container .dd-btn:hover{
 color:#fff;
 background-color: steelblue;
}
/* scrollbar */
.dropdown-container ::-webkit-scrollbar { width: 5px; height: 10px; } 
.dropdown-container ::-webkit-scrollbar-track, 
.dropdown-container ::-webkit-scrollbar-thumb { border-radius: 999px; border: 5px solid transparent; } 
.dropdown-container ::-webkit-scrollbar-track { box-shadow: 1px 1px 5px rgba(0,0,0,.2) inset; } 
.dropdown-container ::-webkit-scrollbar-thumb { min-height: 20px; background-clip: content-box; box-shadow: 0 0 0 5px rgba(0,0,0,.2) inset; } 
.dropdown-container ::-webkit-scrollbar-corner { background: transparent; }

3.插件

;(function ($,window,document,undefined) {
 var _pluginName="jqDropdown";
 var defaults = {
  items:[]
 };
 var parm=[];
 //es5 filter hack
 if (!Array.prototype.filter){
   Array.prototype.filter = function(fun){
   var len = this.length;
   if (typeof fun != "function") throw new TypeError(); 
    var res = new Array();
   var _arg = arguments[1];
   for (var i = 0; i < len; i++){
     if (i in this){
     var val = this[i];
     if (fun.call(_arg, val, i, this)) res.push(val);
     }
   } 
    return res;
   };
 }
 if(!Array.prototype.indexOf) {
  Array.prototype.indexOf = function (elem, startFrom) {
   var startFrom = startFrom || 0;
   if (startFrom > this.length) return -1;
   for (var i = 0; i < this.length; i++) {
    if (this[i] == elem && startFrom <= i) {
     return i;
    } else if (this[i] == elem && startFrom > i) {
     return -1;
    }
   }
   return -1;
  }
 }
 var init = function (o,opts,okFn,cancelFn) {
  var _panel=$(o);
  var _ul=_panel.find(".dd-select:eq(0)");
  function createDropItems(items,p){
   p=p||[];

   _ul.empty();
   var _curretVal=$(".iptdiplay").val();
   for(var i=0,len=items.length;i-1?'dd-item on':'dd-item'));
   }
   _panel.find('.dd-item').click(function(e){
    var $this=$(this);
    var _k_= $this.find('.dd-k:eq(0)').text()
    var _v_= $this.find('.dd-v:eq(0)').text();
    if($this.hasClass('on')){
     parm=parm.filter(function(t){ return t!=_v_; });
     $this.removeClass('on');
    }else{
     parm.push(_v_);
     $this.addClass('on');
    }
    var disArr=[];
    for(var i=0,len=items.length;i-1) disArr.push(_d.name);
    }
    $(".iptdiplay").val(disArr.join('|'));
   });
  };
  //init to build dropdown items
  createDropItems(opts.items||[]);
  function toggleDrop(){
   $(".dropdown-panel").slideToggle();
  };
  
  //search
  $(".iptsearch").bind("input propertychange",function(e){
   if(!e) return;
   var _sk=e.currentTarget.value;
   var _items=opts.items||[];
   createDropItems(_items.filter(function(d){
    return d.name.indexOf(_sk)>-1; 
   }),parm);
  });
  //Toggle dropdown
  $(".dropdown-display").click(function(){
   toggleDrop();
  });
  //OK button event
  $(".dropdown-opt button.ok").click(function(){
   toggleDrop();
   okFn&&okFn.apply(this,[parm]);
  });
  //Cancel button event
  $(".dropdown-opt button.cancel").click(function(){
   toggleDrop();
   cancelFn&&cancelFn.call(this);
  });

 };
 $.fn[_pluginName] = function (options,okFn,cancelFn) {
  var options = $.extend(defaults, options);
  return this.each(function () {
   init(this,options,okFn,cancelFn);
  });
 }
})(jQuery,window,document);

4.頁面調用示例

<script>
 var data=[
  { name:'http://58.100.3.12',val:1 },
  { name:'http://44.168.4.13',val:2 },
  { name:'http://192.168.2.1/sdfsf/234234/234/2/34/23',val:3 },
  { name:'http://220.199.5.14',val:4 },
  { name:'http://127.1.62.15',val:5 },
  { name:'http://127.1.62.15',val:6 },
  { name:'http://127.1.62.15',val:7 },
  { name:'http://127.1.62.15',val:8 },
  { name:'http://127.1.62.15',val:9 },
  { name:'http://127.1.62.15',val:10 },
  { name:'http://127.1.62.15',val:11 },
  { name:'http://127.1.62.15',val:12 },
  { name:'http://127.1.62.15',val:13 },
  { name:'http://127.1.62.15',val:14},
  { name:'http://127.1.62.15',val:15 },
  { name:'http://127.1.62.15',val:16 },
  { name:'http://127.1.62.15',val:17 },
  { name:'http://127.1.62.15',val:18 },
  { name:'http://127.1.62.15',val:19 },
  { name:'http://127.1.62.15',val:20 },
  { name:'http://127.1.62.15',val:21 },
  { name:'http://127.1.62.15',val:22 },
  { name:'http://127.1.62.15',val:23 },
  { name:'http://127.1.62.15',val:24 },
  { name:'http://127.1.62.15',val:25 },
  { name:'http://127.1.62.15',val:26 },
  { name:'http://127.1.62.15',val:27 },
  { name:'http://127.1.62.15',val:28 },
  { name:'http://127.1.62.15',val:29 }
 ];
 $("#demo").jqDropdown({ items:data },function(e){
  console.dir(e);
 },function(){
  console.log('canceled by user !');
 });
 </script>

5.輸出

6.不足

頁面樣式在不支持css3瀏覽器中顯示有問題后期需要改進

下拉數據為一次性渲染如有需要可設置滾動加載

下拉框滾動條的美化未兼容所有瀏覽器

搜索時檢索數據直接源自頁面數據所有需要添加延遲處理獲取服務端數據

以上就是本文的全部內容，希望對大家的學習有所幫助jquery下拉框中實現多選功能，也希望大家多多支持腳本之家。

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