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模仿combox(select)控件 省去美化烦恼

　不用整天为美化select控件烦恼了。

　　1、可批量美化select控件。

　　2、可以有onchange句柄。

　　3、触发onchange的函数可带参数。

　　3、可以得到select的值。

　　4、可设置像select类似的滚动条(如大于或等于8个数目时出现滚动条)

　　5、可设置宽度和高度

　　API参考：

　　//首先生成一个simulateSelect的实例

　　//构造函数的第一个可选参数为触发onchange的函数，其它的为onchange函数的参数;

　　c = new simulateSelect(s1onchange, "never-online");

　　//设置select的CSS，第一个参数为控件的主要CSS、第二个为选中条目时的CSS、第三个为没有选中条目时的CSS

　　c.style("CtlSelect2", "selected2", "unselected2");

　　//设置select的宽度和高度;

　　c.width = 320;

　　c.height = 20;

　　//初始化参数为：select控件的ID，可以用逗号分离，进行批量转换;

　　c.init("s1,s2,s3");

　　下一版本将可修改combox

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> simulate combox control - http://www.never-online.net </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<style>
body, input
{
 font-family: verdana;
 font-size: 9pt;
}
h1
{
 font-family: tahoma;
 font-size: 22pt;
 text-align: left;
}
pre
{
 font-size: 9pt;
 font-family: verdana;
 border: 1px solid #006600;
 width: 400px;
 padding: 10px;
 background: #ffffff;
 color: #006600;
}
.CtlSelect
{
 border: 1px solid #006600;
 font-family: verdana;
 height: 20px;
 color: #006600;
 background: #ffffff;
 /*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg?http://www.xvna.com);*/
}
.selected
{
 background: #006600;
 color: #ffffff;
 height: 20px;
}
.unselected
{
 height: 20px;
 color: #006600;
 line-height: 120%;
 border-bottom: 1px solid #006600;
}
.CtlSelect1
{
 border: 1px solid #003399;
 font-family: verdana;
 height: 20px;
 color: #003399;
 background: #ffffff;
 /*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg?http://www.xvna.com);*/
}
.selected1
{
 background: #003399;
 color: #ffffff;
 height: 20px;
}
.unselected1
{
 height: 20px;
 color: #003399;
 line-height: 120%;
 border-bottom: 1px solid #003399;
}
.CtlSelect2
{
 border: 1px solid #990000;
 font-family: verdana;
 height: 20px;
 color: #990000;
 background: #ffffff;
 /*background:url({E5066804-650D-4757-9BA4-A92DB8817A18}0.jpg?http://www.xvna.com);*/
}
.selected2
{
 background: #990000;
 color: #ffffff;
 height: 20px;
}
.unselected2
{
 height: 20px;
 color: #990000;
 line-height: 120%;
 border-bottom: 1px solid #990000;
}
.copyright
{
 margin-top: 10px;
 font-size: 9pt;
 text-align: center;
 color: #333;
 font-weight: bold;
}
</style>
</HEAD>

<BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
//-------------------------------------------------------------
//  @ Module: simulate select control, IE only.
//  @ Debug in: IE 6.0
//  @ Script by: blueDestiny, never-online
//  @ Updated: 2006-3-22
//  @ Version: 1.0 apha
//  @ Email: blueDestiny [at] 126.com
//  @ Website: http://www.never-online.net
//  @ Please Hold this item please.
//
//  API
//  @ class: simulateSelect()
//
//  @ object.style(ctlStyle[,selStyle][,unselStyle])
//    ctlStyle: main control combox css class name
//    selStyle: when mouseover or option focus css class name
//    unselStyle: options blur's css class name
//
//  @ object.width=(widthPX)
//    widthPX must be a digit number.
//
//  @ object.height=(heightPX)
//    heightPX must be a digit number.
//
//  @ object.getValue(ctlSelID)
//    ctlSelID is the unique select control ID
//
//  -------------- for the next Version ----------
//  @ object.readOnly = (blnReadOnly)
//    blnReadOnly must be a boolean type or a number type.
//  @ object.addEvent(w, h)
//    w: fire handler's event.
//    h: handler function.
//-------------------------------------------------------------

function $(objID)
{
 return document.getElementById(objID);
};
function Offset(e)
{
 var t = e.offsetTop;
 var l = e.offsetLeft;
 var w = e.offsetWidth;
 var h = e.offsetHeight-2;

 while(e=e.offsetParent)
 {
  t+=e.offsetTop;
  l+=e.offsetLeft;
 }
 return {
  top : t,
  left : l,
  width : w,
  height : h
 }
}
//-----------------------------------------------


function simulateSelect(handlerFunction) { with(this)
{
 this.IDs = [];
 this.name = this;
 this.value = null;
 this.onchangeArgs = [];
 this.onchange = handlerFunction;
 this.height = 20;
 this.width = null;
 this.number = null;
 this.ctlStyle = "CtlSelect";
 this.selStyle = "selected";
 this.unselStyle = "unselected";
 this.elementPrefix = "e__";
 this.inputPrefix = "i__";
 this.containerPrefix = "c__";
 this.buttonPrefix = "b__";
 //  property for beta Version
 //  can editable combox
 this.readonly = true;
 if( arguments.length>0 )
 for(var i=0; i<arguments.length; i++)
 onchangeArgs[i-1] = arguments[i];
 return this;
}};
simulateSelect.prototype.init = function(ctlSelIDs) { with(this)
{
 eval(name).append(ctlSelIDs);
 eval(name).simulates();
}};

simulateSelect.prototype.style = function() { with(this)
{
 ctlStyle = arguments[0];
 selStyle = arguments[1];
 unselStyle = arguments[2];
}};
//-----------------------------------------------
simulateSelect.prototype.append = function(ctlSelIDs) { with(this)
{
 if( ctlSelIDs.indexOf(",")>0 )
 {
  var arrCtlSel = ctlSelIDs.split(",");
  for(var i=0; i<arrCtlSel.length; i++)
  {
   IDs.push(arrCtlSel[i]);
  }
 }
 else
 IDs.push(ctlSelIDs);
}};
simulateSelect.prototype.checkupOnMouseDown = function(e) { with(this)
{
 // here compatible mf.
 var el = e ? e.srcElement : e.target;
 if( el.id.indexOf(elementPrefix)>-1 ||
 el.id.indexOf(inputPrefix)>-1 ||
 el.id.indexOf(containerPrefix)>-1 ||
 el.id.indexOf(buttonPrefix)>-1 )
 {
  return;
 }
 else
 {
  for(var i=0; i<eval(name).IDs.length; i++)
  if( $(containerPrefix + IDs[i]) )
  $(containerPrefix + IDs[i]).style.display = "none";
 }

}};
simulateSelect.prototype.simulates = function() { with(this)
{
 for(var i=0; i<IDs.length; i++)
 eval(name).simulate(IDs[i]);
}};
simulateSelect.prototype.simulate = function(ctlSelID) { with (this)
{
 var input;
 var button;
 var object;
 var offset;

 object = $(ctlSelID);
 offset = Offset(object);
 input = document.createElement("INPUT");
 button = document.createElement("BUTTON");
 button.setAttribute("id", buttonPrefix + ctlSelID);
 //button.value = "⊿";
 button.value = "6";
 button.style.fontFamily = "Webdings, Marlett";
 button.style.background = "";
 button.onclick = input.onclick = function()
 {
  this.blur();
  eval(name).expand(ctlSelID, offset);
 };
 input.onselectstart = function()
 {
  eval(name).expand(ctlSelID, offset);
  event.returnValue = false;
 };

 input.setAttribute("id", inputPrefix + ctlSelID);
 input.title = button.title = "click expand options";
 input.style.cursor = button.style.cursor = "default";
 input.className = button.className = ctlStyle;
 input.style.width = (width>0 ? width : object.offsetWidth);
 height ? input.style.height=button.style.height=height : "";
 input.value = value = object[0].text;
 if( readonly==true ) input.readOnly=true;

 // this method is only IE.
 object.insertAdjacentElement("afterEnd",button);
 object.insertAdjacentElement("afterEnd",input);
 object.style.display = 'none';
}};
simulateSelect.prototype.expand = function(ctlSelID, offset) { with(this)
{
 var div;
 var object = $(ctlSelID);

 if( !$(containerPrefix + ctlSelID) )
 {
  div = document.createElement("DIV");
  div.style.position = "absolute";
  div.style.display = "block";
  div.setAttribute("id", containerPrefix + ctlSelID);
  div.className = ctlStyle;
  div.style.left = offset.left;
  div.style.top = offset.top + offset.height;
  div.style.width = (width ? width : offset.width) + 20;
  if( number )
  {
   div.style.height = height * number;
   div.style.overflow = "auto";
  }
  document.body.appendChild(div);

  for(var i=0; i<object.length; i++)
  {
   div = document.createElement("DIV");
   div.setAttribute("id", div.id = elementPrefix + ctlSelID + i);
   div.style.cursor = "default";

   if( object[i].text==$(inputPrefix + ctlSelID).value )
   div.className = selStyle;
   else
   div.className = unselStyle;

   div.innerText = div.title = object[i].text;
   div.style.height = height;
   div.setAttribute("value", object[i].value);

   div.onmouseover = function()
   {
    for(var j=0; j<$(containerPrefix + ctlSelID).childNodes.length; j++)
    {
     if($(containerPrefix + ctlSelID).childNodes[j]==this)
     $(containerPrefix + ctlSelID).childNodes[j].className = selStyle;
     else
     $(containerPrefix + ctlSelID).childNodes[j].className = unselStyle;
    }      
   };
   div.onclick = function()
   {
    $(inputPrefix + ctlSelID).value = this.innerText;
    $(containerPrefix + ctlSelID).style.display = "none";
    if( onchange && value!=$(inputPrefix + ctlSelID).value )
    {
     onchange.apply(this,onchangeArgs);
     value = $(inputPrefix + ctlSelID).value;
    }
   };
   $(containerPrefix + ctlSelID).appendChild(div);
  }
  return;
 }

 if( $(containerPrefix + ctlSelID).style.display=="none" )
 {
  for(var i=0; i<object.length; i++)
  {
   if( object[i].text==$(inputPrefix + ctlSelID).value )
   $(elementPrefix + ctlSelID + i).className = selStyle;
   else
   $(elementPrefix + ctlSelID + i).className = unselStyle;
  }
  $(containerPrefix + ctlSelID).style.display="block";
  return;
 }

 if( $(containerPrefix + ctlSelID).style.display=="block" )
 {
  $(containerPrefix + ctlSelID).style.display="none";
  return;
 }
}};
simulateSelect.prototype.getValue = function(ctlSelID) { with(this)
{
 if( $(inputPrefix + ctlSelID) )
 return $(inputPrefix + ctlSelID).value;
 else
 return null;
}};
simulateSelect.prototype.addEvent = function(w, h) { with(this)
{
}};
//-----------------------------------------------
//window.onerror = Function("return true;");
//  IE only.
document.attachEvent("onmousedown", function() {
 a.checkupOnMouseDown(event);
 b.checkupOnMouseDown(event);
 c.checkupOnMouseDown(event)
});
window.attachEvent("onload", function() {
 window.a = new simulateSelect();
 a.style("CtlSelect", "selected", "unselected");
 a.init("s1");
 //-------------------------------------------
 window.b = new simulateSelect();
 b.style("CtlSelect1", "selected1", "unselected1");
 b.width = 300;
 b.number = 9;
 b.init("s2");
 //-------------------------------------------
 window.c = new simulateSelect(s1onchange, "never-online", a.getValue('s1'));
 c.style("CtlSelect2", "selected2", "unselected2");
 c.width = 320;
 c.init("s3");
});
function s1onchange(para, s)
{
 alert("onchage handler fire " + para + s);
}
//-->
</SCRIPT>
<h1> simulate combox control </h1>
<h4> demonstrate </h4>

<p>
normal select: <select id="s0">
<option value="- please select your options -"> - please select your options -</option>
<option value="1">option1</option>
<option value="2">option2</option>
<option value="3">option3</option>
<option value="4">option4</option>
<option value="5">option5</option>
</select>
</p>

<p>
simulate select: <select id="s1">
<option value="- please select your options -"> - please select your options -</option>
<option value="1">1option1</option>
<option value="2">1option2</option>
<option value="3">1option3</option>
<option value="4">1option4</option>
<option value="5">1option5</option>
</select>
</p>

<p>
scroll simulate select: <select id="s2">
<option value="- please select your options -"> - please select your options -</option>
<option value="1">2option1</option>
<option value="2">2option2</option>
<option value="3">2option3</option>
<option value="4">2option4</option>
<option value="5">2option6</option>
<option value="5">2option7</option>
<option value="5">2option8</option>
<option value="5">2option9</option>
<option value="5">2option10</option>
<option value="5">2option11</option>
<option value="5">2option12</option>
<option value="5">2option13</option>
<option value="5">2option14</option>
</select>
</p>

<p>
onchange handler fire: <select id="s3">
<option value="- please select your options -"> - please select your options -</option>
<option value="1">3option1</option>
<option value="2">3option2</option>
<option value="3">3option3</option>
<option value="4">3option4</option>
<option value="5">3option5</option>
</select>
</p>

<button onclick="alert(a.getValue('s1') + '\n\n' + b.getValue('s2') + '\n\n' + c.getValue('s3'))" class="CtlSelect"> Get value </button>
<button onclick="alert('next version')"  class="CtlSelect">append item</button>
<button onclick="alert('next version')"  class="CtlSelect">remove item</button>

<h4> description </h4>
<pre>
//-------------------------------------------------------------
//  @ Module: simulate select control, IE only.
//  @ Debug in: IE 6.0
//  @ Script by: blueDestiny, never-online
//  @ Updated: 2006-3-22
//  @ Version: 1.0 apha
//  @ Email: blueDestiny [at] 126.com
//  @ Website: http://www.never-online.net
//  @ Please Hold this item please.
//
//  API
//  @ class: simulateSelect()
//
//  @ object.style(ctlStyle[,selStyle][,unselStyle])
//    ctlStyle: main control combox css class name
//    selStyle: when mouseover or option focus css class name
//    unselStyle: options blur's css class name
//
//  @ object.width=(widthPX)
//    widthPX must be a digit number.
//
//  @ object.height=(heightPX)
//    heightPX must be a digit number.
//
//  @ object.getValue(ctlSelID)
//    ctlSelID is the unique select control ID
//
//  -------------- for the next Version ----------
//  @ object.readOnly = (blnReadOnly)
//    blnReadOnly must be a boolean type or a number type.
//  @ object.addEvent(w, h)
//    w: fire handler's event.
//    h: handler function.
//-------------------------------------------------------------
</pre>

<div class="copyright">
Power By blueDestiny, never-online
http://www.never-online.net
</div>
</BODY>
</HTML>

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