L@_@K
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head> <body>
<input type="text" id="a" />
<select id="sel" onchange="return(if (a.value==''){return false;})">
<option value=1>111</option>
<option value=2 selected>222</option>
<option value=3>333</option>
</select>
</body>
<script type="text/javascript">
<!--
function $(sId)
{
return document.getElementById(sId);
}
var oSel = $("sel");
oSel.priviousSelectedIndex = oSel.selectedIndex;
oSel.onchange = function(){
if ($("a").value == "")
{
this.selectedIndex = this.priviousSelectedIndex;
}
};
//-->
</script>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head> <body>
<input type="text" id="a" />
<select id="sel" onchange="return(if (a.value==''){return false;})">
<option value=1>111</option>
<option value=2 selected>222</option>
<option value=3>333</option>
</select>
</body>
<script type="text/javascript">
<!--
function $(sId)
{
return document.getElementById(sId);
}
var oSel = $("sel");
oSel.priviousSelectedIndex = oSel.selectedIndex;
oSel.onchange = function(){
if ($("a").value == "")
{
this.selectedIndex = this.priviousSelectedIndex;
}
};
//-->
</script>
</html>
我还以为还有什么onXXXX的事件激发方法可以解决哩,结果还是要用function来解决。
我在你的代码加了一句:
else
oSel.priviousSelectedIndex = oSel.selectedIndex;
你的代码变成:.....
if ($("a").value == "")
{
this.selectedIndex = this.priviousSelectedIndex;
}else
oSel.priviousSelectedIndex = oSel.selectedIndex;
.....就非常符合我的需求了。
{
if(obj.getAttributeNode("back_style") == null)
{ var newAtt = document.createAttribute("back_style");
newAtt.nodeValue = obj.style.cssText;
obj.setAttributeNode( newAtt );
}
obj.style.border = "1px dotted #008040";
obj.style.color = "#008040";
obj.style.backgroundColor = "#F0FFF0";
}
//------------------------------------------------
/* if( obj.style.borderStyle == "dotted" || obj.style.borderStyle == "dotted dotted dotted dotted" )
myself.hint_back( obj ); */
//------------------------------------------------
this.hint_back = function (obj)
{ if( obj.getAttributeNode("back_style") != null )
{ obj.style.cssText = obj.getAttribute("back_style");
}
else
obj.style.cssText = "";
}