Implementation method of ComBox that can input text to search for ajax drop-down box control

GooFunc.js文件

//获取一个DIV的绝对坐标的功能函数,即使是非绝对定位,一样能获取到
function getElCoordinate(dom) {
 var t = dom.offsetTop;
 var l = dom.offsetLeft;
 dom=dom.offsetParent;
 while (dom) {
  t += dom.offsetTop;
  l += dom.offsetLeft;
    dom=dom.offsetParent;
 }; return {
  top: t,
  left: l
 };
}
//兼容各种浏览器的,获取鼠标真实位置
function mousePosition(ev){
    if(!ev) ev=window.event;
  if(ev.pageX || ev.pageY){
    return {x:ev.pageX, y:ev.pageY};
  }
  return {
    x:ev.clientX + document.documentElement.scrollLeft - document.body.clientLeft,
    y:ev.clientY + document.documentElement.scrollTop - document.body.clientTop
  };
}
//给DATE类添加一个格式化输出字串的方法
Date.prototype.format = function(format) 
{ 
  var o = { 
   "M+" : this.getMonth()+1, //month
   "d+" : this.getDate(),  //day
   "h+" : this.getHours(),  //hour
   "m+" : this.getMinutes(), //minute
   "s+" : this.getSeconds(), //second ‘
     //quarter
   "q+" : Math.floor((this.getMonth()+3)/3),
   "S" : this.getMilliseconds() //millisecond
  } 
  if(/(y+)/.test(format)) format=format.replace(RegExp.$1,(this.getFullYear()+"").substr(4 - RegExp.$1.length)); 
  for(var k in o)if(new RegExp("("+ k +")").test(format)) 
   format = format.replace(RegExp.$1, 
    RegExp.$1.length==1 ? o[k] : 
     ("00"+ o[k]).substr((""+ o[k]).length)); 
  return format;
}
 
 
<pre name="code" class="javascript"><pre name="code" class="javascript"><pre name="code" class="javascript"><pre name="code" class="javascript">GooCombo.JS文件

/*下拉框定义--GooCombo类*/
//dom :要被绑定的DOM对象，必须要有其ID或者NAME，且未被JQUERY对象化
//property :JSON变量，SLIDER的详细参数设置
//目前，构造函数可接受用普通DOM容器或者直接传送SELECT控件来进行渲染
function GooCombo(dom,property){
    this.$div=null;//渲染完毕后最父框架的DIV
    this.$id=null;//this.$div中SELECT控件的ID
    this.$name=null;//this.$div中SELECT控件的NAME
    this.$width = property.width; //下拉框控件的宽度，必填项
   
    this.$haveIcon=property.haveIcon||false;
    this.$input = $("<input type=&#39;text&#39; value=&#39;" + property.text + "&#39; " + (property.readOnly ? "readonly=&#39;readonly&#39;" : "") + (this.$haveIcon ? " style=&#39;margin-left:20px;width:" + (this.$width - 39) + "px&#39;" : "") + "/>"); //下拉框控件中始终显示的文本框INPUT
    this.$btn=$("<div class=&#39;btn_up&#39;></div>");//下拉框右部的按钮
    this.$data=[];//下拉框控件的所有显示文字和值,二维数组
    this.$type="basic";//下拉框控件的运行模式，有basic基本,multiple可多选,filter过滤显示 三种,默认为basic
    this.$selectHeight=property.selectHeight||0;
    this.$list=$("<ul style=&#39;width:"+(this.$width-2)+"px;height:"+property.selectHeight+"px;&#39;></ul>");//下拉框的列表JQUERY对象
    this.$lastSelect=null;//当前最近一次被选中的单元,在this.$type="multiple"时，它将不发挥其记录作用
    this.$select = null; //保存所选值的单元一般为select控件
    this.$autoLoad=false;//是否动设置为动态载入数据，既下拉动作触发时再载入数据，默认为FALSE()
    this.$alreadyLoad=false;//是否已经载入完了数据,默认为false
    //设置为动态自动获取数据(渲染后Combo中的input框被选中后载入数据)
    this.setAutoLoad=function(bool){
        this.$autoLoad=true;
    };
    if(property.autoLoad) this.setAutoLoad(property.autoLoad);
    this.$ajaxType=null;//，其变量为一个远程链接参数的JSON数组，格式例如：{url:"website/pp.php",type:"POST",para:(与JQUERY中的AJAX方法中传参DATA一样)}默认为空
    this.setAjaxType=function(json){
        this.$ajaxType.url=json.url;
        this.$ajaxType.type=json.type;
        this.$ajaxType.para=json.para;
        this.$ajaxType.dataType=json.dataType;
    };
if (property.ajaxType) this.setAjaxType(property.ajaxType);
 
 
    //开始构造函数主要内容
    if(dom!=null && dom.tagName=="SELECT"){
        var temp="";
        for(var i=0;i<dom.length;i++){
            this.$data[i]=[(dom.options[i].value||dom.options[i].text),dom.options[i].text,""];
            temp+="<a href=&#39;#&#39;><p "+"value=&#39;"+this.$data[i][0]+"&#39;>"+this.$data[i][1]+"</p></a>";
        }
        this.$list.append(temp);
        this.$id=dom.id;
        this.$name=dom.name;
        if(dom.multiple) this.$type="multiple";
        this.$select=$(dom);
        this.$select.wrap("<div class=&#39;Combo&#39; id=&#39;Combo_"+this.$id+"&#39;></div>")
        this.$div=this.$select.parent(".Combo");
    }
    else{
        this.$div=$(dom);
        this.$div.addClass("Combo");
        this.$select=$("<select></select>");
        this.$div.append(this.$select);
    }
    //this.$div.before(this.$septum);
    this.$div.css({width:this.$width+"px"});
    this.$div.append("<div class=&#39;text&#39; style=&#39;width:"+(this.$width-19)+"px;&#39;></div>").append(this.$btn).append(this.$list);
    this.$div.children("div:eq(0)").append("<div class=&#39;top_border&#39;></div>").append(this.$input);
     
    //如果DOM为一个SELECT控件，则property中的属性还可以覆盖掉原来的ID，NAME ,type="multple"的默认设置
    //ID,NAME,TYPE如果在传入SELECT时就已经通过SELECT来定义，则PROPERTY中可以不用再写
    if(property.id)     {this.$id=property.id;this.$select.attr("id",property.id);}
    if(property.name)   {this.$name=property.name;this.$select.attr("name",property.name);}
    if(property.type){
        this.$type=property.type;
        if(property.type=="multiple") {this.$select.attr("size",1);this.$select.attr("multiple",property.type);}
        else    this.$select.removeAttr("multiple");
    }
    //载入一组数据的方法
    this.loadListData = function (data) {
      this.$data = [];
      if (this.$list.children("a").length > 0) {
        this.$list.empty();
        this.$select.empty();
      }
      temp = "", temp2 = "";
      for (i = 0; i < data.length; ++i) {
        this.$data[i] = [data[i][0], data[i][1], data[i][2] || ""];
        if (this.$type== "filter")//在这里可以修改你想类型 basic 当鼠标点击进去是否展现初始数据
          temp += "<a href=&#39;#&#39;><p " + (this.$haveIcon ? "style=&#39;text-indent:19px;background:" + this.$data[i][2] + "&#39; " : "") + "value=&#39;" + this.$data[i][0] + "&#39;>" + this.$data[i][1] + "</p></a>";
        temp2 += "<option value=&#39;" + this.$data[i][0] + "&#39;>" + this.$data[i][1] + "</option>";
      }
      if (this.$type == "filter")
       
     
      this.$list.append(temp);
      this.$select.append(temp2);
      this.$alreadyLoad = true;
    };
    if(property.data)   this.loadListData(property.data);
    //动态远程载入数据，AJAX请求的参数将读取this.$ajaxType中的设置
    this.loadListDataAjax=function(){
        var inthis=this;
        $.ajax({
              type:this.$ajaxType.type,
              url:this.$ajaxType.url,
              dataType:this.$ajaxType.dataType,
              data:this.$ajaxType.para,
        success:function(data){
            inthis.loadListData(data);
        }});
 
};
 
//提示文字
$("input[type=&#39;text&#39;]").each(function () {
  if ($(this).val() == property.text) {
    $(this).bind("focus", function () {
      $(this).val("");
    }).blur(function () {
      $(this).val(property.text)
    });
 
  }
});
 
    //绑定当INPUT框被选中时的事件
    this.$input.bind("focus", { inthis: this }, //如果this.$autoLoad或!this.$alreadyLoad有一个为FALSE，则ajaxType将无效，可不传
    function (e) {
      if (e && e.preventDefault) e.preventDefault(); //阻止默认浏览器动作(W3C)
      else window.event.returnValue = false; //IE中阻止函数器默认动作的方式
      var inthis = e.data.inthis;
//    inthis.$autoLoad = true;
// 
// 
//    inthis.$alreadyLoad = false;
//    inthis.$ajaxType = false;
      if (!inthis.$alreadyLoad && inthis.$autoLoad) {
 
        if (inthis.$ajaxType) {//如果是远程AJAX获取数据
 
          inthis.loadListDataAjax();
        }
        else
      {
          inthis.loadListData(inthis.$data);
        }
 
      }
      var list = inthis.$list;
 
      var height = inthis.$selectHeight;
      var width = inthis.$width;
      list.css("display", "block");
      $(document).bind("mouseup", function (e) {
        var locate = getElCoordinate(list.get(0));
        var ev = mousePosition(e);
        if (locate.left + width < ev.x || locate.left > ev.x || locate.top - 22 > ev.y || locate.top + height + 2 < ev.y) {
          list.css("display", "none");
        }
        this.onmouseup = null;
        return false;
      });
      return false;
    });
    //绑定当INPUT框中的内容被改变时的事件
    if(!this.$readOnly){
        if(this.$type=="filter"){//当type=="filter"时
          this.$input.bind("change", { inthis: this }, function (e) {
            var inthis = e.data.inthis;
            //var text=""+this.value;
            var text = $.trim(this.value)
 
            var data = inthis.$data;
            var temp = "";
 
            if (inthis.$ajaxType) {//如果ajaxType属性有设置，则filter模式下，下拉框控件将在每次change时，动态从获取数据
              inthis.$ajaxType.para["search"] = text; //后台需要对REQUEST传入的search变量有一个向前模糊匹配的查询功能
              inthis.loadListDataAjax();
            }
            else {
              for (var i = 0; i < data.length; ++i)
          {
                if (data[i][1].indexOf(text) == 0)
                temp +="<a href=&#39;#&#39;><p " + (inthis.$haveIcon ? "style=&#39;text-indent:19px;background:" + data[i][2] + "&#39; " : "") + "value=&#39;" + data[i][0] + "&#39;>" + data[i][1] + "</p></a>";
              }
              inthis.$list.empty();
              inthis.$list.append(temp);
            }
          });
        }
        else{
          this.$input.bind("change", { inthis: this }, function (e) {
            var text = this.value;
            var inthis = e.data.inthis;
            var data = e.data.inthis.$data;
          
            for (var i = 0; i < data.length; ++i) {
              if (data[i][1] == text) {
                if (inthis.$lastSelect)
                  inthis.$lastSelect.removeClass("active");
                inthis.$lastSelect = inthis.$list.children("a:eq(" + i + ")").addClass("active");
                now = inthis.$list.children("a:eq(" + i + ")").children("p");
                inthis.$select.val(data[i][0]);
                if (inthis.$haveIcon) {
                  $(this).parent(".text").css({
                    background: now.css("background"),
                    "background-image": "url(../images/combo_icon.gif)",
                    "background-position": now.css("background-position"),
                    "background-repeat": now.css("background-repeat")
                  });
                }
                break;
              }
            }
          });
        }
        var once=null;
        this.$input.bind("keyup", { input: this.$input, list: this.$list }, function (e) {
          if (!e) e = window.event;
          if (e.keyCode == 13)
            e.data.list.css("display", "none");
          else if (e.keyCode == 40) {
            var temp = e.data.list.children("a:eq(0)");
            temp.focus();
            temp.toggleClass("focus");
          }
          else {
            //alert("进入keyup");
            once = null;
            once = setTimeout(function () { e.data.input.change(); }, 500);
          }
        });
    }
    //绑定下拉按钮的事件
    this.$btn.bind("mousedown",function(){
        inthis=$(this);
        inthis.removeClass("btn_up");
        inthis.addClass("btn_down");
    });
    this.$btn.bind("mouseup",{input:this.$input},function(e){
        inthis=$(this);
        inthis.removeClass("btn_down");
        inthis.addClass("btn_up");
        e.data.input.focus();
    });
    //选中下拉框中一个指定索引的值（如果是multiple模式，且这个值原来已经被选定，则运行此函数后将会取消该选定）
    this.selectValue=function(index){
        if(index>0&&index<this.$data.length){
            var p=this.$list.children("a:eq("+index+")");
            if(this.$lastSelect)    this.$lastSelect.removeClass("active");
            this.$lastSelect=p;
            p.click();
        }
    };
    //绑定下拉列表单元被点击时的事件
    this.$list.bind("click",{inthis:this},function(e){
        if ( e && e.preventDefault )    e.preventDefault();//阻止默认浏览器动作(W3C)
        else    window.event.returnValue = false;//IE中阻止函数器默认动作的方式
        if(!e) e=window.event;
        var clicked=$(e.target);
        var inthis=e.data.inthis;
        if(clicked.attr("tagName")=="A")    clicked=clicked.children("p");
        else if(clicked.attr("tagName")=="UL"){
            this.style.display="none";
            return;
        }              
        if(inthis.$haveIcon){
            inthis.$input.parent(".text").css({
            background:clicked.css("background"),
            "background-image":"url(../images/combo_icon.gif)",
            "background-position":clicked.css("background-position"),
            "background-repeat":clicked.css("background-repeat")   
            });
        }
        if(inthis.$type!="multiple"){
            if(inthis.$lastSelect)  inthis.$lastSelect.removeClass("active");
            inthis.$lastSelect=clicked.parent("a").addClass("active");
            this.style.display="none";
            inthis.$select.val(clicked.attr("value"));
            inthis.$input.val(clicked.text());
        }
        else{
            clicked.parent("a").toggleClass("active");
            var optionList=inthis.$select.get(0).options;
            for(var i=0;i<optionList.length;++i){
                if(optionList[i].value==clicked.attr("value")){
                    optionList[i].selected=!optionList[i].selected;
                    break;
                }
            }
            inthis.$input.val(clicked.text()+" , ……");
        }
        inthis.$select.change();
        //alert(inthis.$select.val());
        return false;
    });
    //绑定当用户用鼠标上/下滑过选择列表内容时的事件
    this.$list.bind("mouseover",{list:this.$list},function(e){
        if(!e) e=window.event;
        var clicked=$(e.target);
        if(clicked.attr("tagName")=="P")    clicked=clicked.parent("a");
        else if(clicked.attr("tagName")=="UL"){
            return;
        }
        clicked.focus();
        clicked.addClass("focus");
    });
    this.$list.bind("mouseout",{list:this.$list},function(e){
        if(!e) e=window.event;
        var clicked=$(e.target);
        if(clicked.attr("tagName")=="P")    clicked=clicked.parent("a");
        else if(clicked.attr("tagName")=="UL")  return;
        clicked.removeClass("focus");
    });
    //绑定当用户用上/下方向键选择列表内容时的事件
    this.$list.bind("keydown",{inthis:this},function(e){
        if(!e) e=window.event;
        var inthis=e.data.inthis;
        if(e.keyCode==13){//回车
            if ( e && e.preventDefault )    e.preventDefault();//阻止默认浏览器动作(W3C)
            else    window.event.returnValue = false;//IE中阻止函数器默认动作的方式
            var clicked=$(e.target);
            if(clicked.attr("tagName")=="P")    clicked=clicked.parent("a");
            else if(clicked.attr("tagName")=="UL")  return;
            clicked.focus();
            clicked.click();
            return false;
        }
        else if(e.keyCode==40){
            var clicked=$(e.target);
            if(clicked.attr("tagName")=="P")    clicked=clicked.parent("a");
            else if(clicked.attr("tagName")=="UL")  return;
            var now=$(e.target);
            var next=$(e.target).next("a:eq(0)");
            if(next.length>0){
                now.removeClass("focus");
                next.addClass("focus");
                next.focus();
            }
        }
        else if(e.keyCode==38){
            var clicked=$(e.target);
            if(clicked.attr("tagName")=="P")    clicked=clicked.parent("a");
            else if(clicked.attr("tagName")=="UL")  return;
            var now=$(e.target);
            var prev=$(e.target).prev("a");
            if(prev.length>0){
                now.removeClass("focus");
                prev.addClass("focus");
                prev.focus();
            }
        }
    });
    //返回下拉框的被选值//如果是多选，则会返回一串值构成的字符串，以逗号隔开
    //此下拉框也可放在一般的FORM之中，并像普通的SELECT下拉菜单控件一样操作，当FORM提交时，后台可request获取一个被选取值的数组
    this.getValue=function(){
        return this.$select.val();
    };
 
    //绑定当控件中隐藏的SELECT的值变化以后,触发的方法,通过对其设置，可达到drop-on-drop的多个下拉框相互联动功能,参数Fn为要触发执行的函数
    this.bindValueChange=function(Fn){
      this.$select.bind("change", Fn);
 
    };
    //删除一个选择项,index为定位参数，从0开始（即第一行的选择项）
    this.delItem=function(index){
        if(index>-1&&index<this.$data.length){
            this.$data.splice(index,1);
            this.$select.get(0).options.remove(index);
            this.$list.children("a:eq("+index+")").remove();
        }
    };
    //增加一个选择项，项,index为定位参数，从0开始（即第一行的选择项）
    this.addItem=function(index,Item){
        if(index=this.$data.length){//如果是加在最末尾
            this.$data[index]=Item;
            this.$list.append("<a href=&#39;#&#39;><p "+(this.$haveIcon? "style=&#39;text-indent:19px;background:"+Item[2]+"&#39; " : "")+"value=&#39;"+Item[0]+"&#39;>"+Item[1]+"</p></a>");
        }
        else{
            this.$data.splice(index,0,Item);
            this.$list.children("a:eq("+index+")").before("<a href=&#39;#&#39;><p "+(this.$haveIcon? "style=&#39;text-indent:19px;background:"+Item[2]+"&#39; " : "")+"value=&#39;"+Item[0]+"&#39;>"+Item[1]+"</p></a>");
        }
        this.$select.get(0).options.add(new Option(Item[1], Item[0]));
    };
    //清除所有选项
    this.clearItems=function(){
        this.$data=null;
        this.$data=[];
        this.$list.empty();
        this.$select.get(0).options.length=0;
        this.$select.empty();
        this.$alreadyLoad=false;
    };
}
 
  
 
//将此类的构造函数加入至JQUERY对象中
jQuery.extend({
    createGooCombo: function(dom,property) {
        return new GooCombo(dom,property);
 }
}); 

HTML页面:(要先引入jquery 库)
$(document).ready(function () {

//创建控件开始
var property =
{
id: "demo",
name: "demo",
type: "filter",
readOnly: false,
width: 160,
selectHeight: 140,
autoLoad: true,
haveIcon: false,
text: "可输入员工姓名查找"
}
var combo = $.createGooCombo(document.getElementById("combo"), property);
combo.loadListData(datas);
//创建控件结束
})

datas是由ashx一般处理文件生成二维数组的json字符串 var datas=["+jsonString+"]

  public string CreateJsonParameters(DataTable dt)
  {
    System.Text.StringBuilder sb = new System.Text.StringBuilder();
 
    if (dt != null)
    {
      for (int i = 0; i < dt.Rows.Count -1; i++)
      {
        if (i < dt.Rows.Count - 1)
        {
          sb.Append("[" + dt.Rows[i]["EmployeeID"].ToString() + ", " + dt.Rows[i]["EmployeeNameID"].ToString() + "],");
         
        }
        else if (i == dt.Rows.Count - 1)
        {
          sb.Append("[" + dt.Rows[i]["EmployeeID"].ToString() + "," + dt.Rows[i]["EmployeeNameID"].ToString() + "],");
        }
      }
    }
       
     return   sb.ToString().TrimEnd(",".ToCharArray());
   
  }