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今天刚刚看到罗亭的许可.
"请勿做商用".
说明:
1.罗亭的可输入下拉框是个加密版.(变量名,函数名都被替换成数字)
2.函数众多.比如添加删除OPTION等被简化掉了.各位可以参考罗亭的贴子.
总之,这个要小上一点.看起来也可能会清楚点.
test.html
<HTML>
<HEAD>
<TITLE>compobox</TITLE>
<META http-equiv=Content-Type content="text/html; charset=shift_JIS">
<!--以外部引用方式-->
<SCRIPT TYPE="text/javascript" src="ComboBox.js"></SCRIPT>
</HEAD>
<BODY onload="init();"><!-- onresize="resetAllSize();"这句话不加好象也可以.-->
<form name="form1">
<!--如果不定宽度的话,会有很怪的效果^^-->
<table border="1" width="395">
<tr>
<td width="140">input web address:</td>
<td width="216">
<select id="comboBox1" style="POSITION: absolute;
onResize="if (combox1!=null) {combox1.doResize();}"
onChange="if (combox1!=null) {combox1.doChange();}" name="select2">
<!--这句话里的selected似乎不起作用,可能我没看出来-->
<option value=www.51js.com selected>www.51js.com</option>
<option value=www.ccbfu.com>www.ccbfu.com</option>
<option value=www.sina.com.cn>www.sina.com.cn</option>
</select>
</td>
</tr>
<tr>
<td width="140">input web address:</td>
<td height="200" width="216">
<!--如果要建立多个的话可以参考这种做法-->
<select id="comboBox2" style="POSITION: absolute"
onResize="if (combox2!=null) {combox2.doResize();}"
onChange="if (combox2!=null) {combox2.doChange();}" name="select">
<option value=www.51js.com selected>www.51js.com</option>
<option value=www.ccbfu.com>www.ccbfu.com</option>
<option value=www.sina.com.cn>www.sina.com.cn</option>
</select>
</td>
</tr>
<!--提交后可以看到它是如何传递值的-->
<input type="submit" value="submit">
<SCRIPT>
var combox1,combox2;
function init()
{
combox1 = new combobox("comboBox1", "combox1");
combox1.doSelectIdx(-1);
combox2 = new combobox("comboBox2", "combox2");
combox2.doSelectIdx(-1);
}
</SCRIPT>
</form>
</BODY>
</HTML>
ComboBox.js
function getLeftPostion( theObj )
{
var pos = 0;
while ( theObj != null )
{
pos += theObj.offsetLeft;
//get the Object which contain theObj.
theObj = theObj.offsetParent;
}
return pos;
}
function getTopPostion( theObj )
{
var pos = 0;
while ( theObj != null )
{
pos += theObj.offsetTop;
//get the Object which contain theObj.
theObj = theObj.offsetParent;
}
return pos;
}
function checkVersion()
{
var isBadVersion=true;
var curVer=navigator.appVersion;
var pos=parseInt(curVer.indexOf("MSIE"));
if (pos>=1)
{
var intVer=parseInt(curVer.charAt(pos+5));
if (intVer>=5)
{ isBadVersion=false;}
}
if (isBadVersion)
{
var msg="This page may not be displayed properly:\n"+
" This product requires Microsoft Internet Explorer 5 or later browser only.";
alert(msg);
}
}
//check the browser version
checkVersion();
// the array of comboBoies
theArray = new Array();
function combobox(objId, objHandler)
{
this.comObj = document.all[objId];
this.comObj.selectedIndex = -1;
this.getValue = getValue;
this.doResize = doResize;
this.doChange = doChange;
this.loseFocus = loseFocus;
this.doSelectIdx = doSelectIdx;
this.focus = focus;
var strMsg="";
//------------------------------------------------------------------------------------------------------
// create the text object
//------------------------------------------------------------------------------------------------------
var txtObjIdName = objId + "_text";
if (document.all[txtObjIdName] != null)
{
strMsg="The following id: '" + txtObjIdName +"' is used internally by the Combo Box!\r\n"+
"Use of this id in your page may cause malfunction. Please use another id for your controls.";
alert(strMsg);
}
var txtInner = "<INPUT type='text' id=" + txtObjIdName + " name=" + txtObjIdName +
" onblur='" + objHandler + ".loseFocus()' " +
" style='display: none; position: absolute' value='' >";
this.comObj.insertAdjacentHTML("afterEnd", txtInner);
this.txtObj = document.all[txtObjIdName];
//------------------------------------------------------------------------------------------------------
// end
//------------------------------------------------------------------------------------------------------
this.beResizing = false;
this.doResize();
theArray[theArray.length] = this;
}
function loseFocus()
{
var theComObj = this.comObj;
var theTxtObj = this.txtObj;
var i;
theComObj.selectedIndex = -1;
if (theTxtObj.value == "")
{ return; }
var optLen = theComObj.options.length;
for (i=0; i<optLen; i++)
{
var comVal = theComObj.options[i].text;
var txtVal = theTxtObj.value;
if (comVal == txtVal)
{ theComObj.selectedIndex = i;
return;
}
}
}
function doResize()
{
if (!this.beResizing)
{
this.beResizing = true;
this.txtObj.style.display="none";
this.comObj.style.position="static";
this.txtObj.style.posLeft = getLeftPostion(this.comObj);
this.txtObj.style.posTop = getTopPostion(this.comObj) + 1;
this.txtObj.style.posWidth = this.comObj.offsetWidth - 16;
this.txtObj.style.posHeight = this.comObj.offsetHeight;
this.comObj.style.position ="absolute";
this.comObj.style.posLeft = this.txtObj.style.posLeft;
this.comObj.style.posTop = this.txtObj.style.posTop;
this.offWidth = this.comObj.offsetWidth;
var strRect = "rect(0 "+(this.comObj.offsetWidth)+" "+ this.comObj.offsetHeight +
" "+(this.txtObj.style.posWidth - 2 )+")";
this.comObj.style.clip = strRect;
this.txtObj.style.display="";
this.beResizing = false;
}
}
function doChange()
{
var idx = this.comObj.selectedIndex;
var opt = this.comObj.options[idx];
this.txtObj.value = opt.text;
this.txtObj.focus();
this.txtObj.select();
this.comObj.selectedIndex=-1;
}
function getValue()
{ return this.txtObj.value; }
function doSelectIdx(i)
{
var optLen = this.comObj.options.length;
if ((i >=0) && (i < optLen))
{ this.comObj.selectedIndex = i;
this.txtObj.value = this.comObj.options[i].text;
return;
}
this.txtObj.value = "";
}
function focus()
{ this.txtObj.focus(); }
/* resize all combobox when window be resized */
function resetAllSize()
{
var i;
for (i=0; i < theArray.length; i++)
{
theArray[i].doResize();
}
}
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