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分享求救！简单问题
<form name="dynamiccombo" method="post" runat="server">
<select name="stage2" size="0" onchange="displaysub()">
<option value="#" selected>this is a place</option>
<option value="#">this is a place</option>
<option value="#">this is a place</option>
<option value="#">this is a place</option>
</select>
<input type="button" name="btgo" value="GO!" onclick="gothere()">
</form>
<script language="javascript">
var cacheobj=document.dynamiccombo .stage2
</script>
运行时，总是提示document.dynamiccombo .stage2 为空对像，如何把改为document.getElementByName("stage2"),可又提示cacheobj.options.length错误
希望多多指点
<select name="stage2" size="0" onchange="displaysub()">
<option value="#" selected>this is a place</option>
<option value="#">this is a place</option>
<option value="#">this is a place</option>
<option value="#">this is a place</option>
</select>
<input type="button" name="btgo" value="GO!" onclick="gothere()">
</form>
<script language="javascript">
var cacheobj=document.dynamiccombo .stage2
</script>
运行时，总是提示document.dynamiccombo .stage2 为空对像，如何把改为document.getElementByName("stage2"),可又提示cacheobj.options.length错误
希望多多指点
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wujf 2006-01-11
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你啊runat="server"去掉试试, 应该不会有问题. 还要就是你的httpserver是什么, 如果runat="server",你直接打开html文件和通过http方式打开是不一样的.
jerrie_1 2006-01-11
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还有就是：document.dynamiccombo .stage2 这句话中有没有空格都是一样的
jerrie_1 2006-01-11
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谢谢楼上几位！
不过都没有解决！
问题在于：在源代码中<form name="dynamiccombo" method="post" runat="server">
可运行后查看源文件却成了<form name="_ctl0" method="post" action="combo box.aspx" id="_ctl0">
可能是因为这个，当然document.dynamiccombo.stage2 会为空对象，可又不知道为什么为变成这样？能帮我解释一下
不过都没有解决！
问题在于：在源代码中<form name="dynamiccombo" method="post" runat="server">
可运行后查看源文件却成了<form name="_ctl0" method="post" action="combo box.aspx" id="_ctl0">
可能是因为这个，当然document.dynamiccombo.stage2 会为空对象，可又不知道为什么为变成这样？能帮我解释一下
wuyanfeng 2006-01-10
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对了，如果你的IE版本小于5 那么：
<script id=clientEventHandlersJS language=javascript>
<!-- // 此处必须加上固定字符。
function document_onclick() {
}
//-->
</script>
<script id=clientEventHandlersJS language=javascript>
<!-- // 此处必须加上固定字符。
function document_onclick() {
}
//-->
</script>
wuyanfeng 2006-01-10
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只是多了一个空格。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<form name="dynamiccombo" method="post" runat="server">
<select name="stage2" size="0" onchange="displaysub()">
<option value="#" selected>this is a place</option>
<option value="#">this is a place</option>
<option value="#">this is a place</option>
<option value="#">this is a place</option>
</select>
<input type="button" name="btgo" value="GO!" onclick="gothere()">
</form>
<script language="javascript">
var cacheobj=document.dynamiccombo.stage2
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<body>
<form name="dynamiccombo" method="post" runat="server">
<select name="stage2" size="0" onchange="displaysub()">
<option value="#" selected>this is a place</option>
<option value="#">this is a place</option>
<option value="#">this is a place</option>
<option value="#">this is a place</option>
</select>
<input type="button" name="btgo" value="GO!" onclick="gothere()">
</form>
<script language="javascript">
var cacheobj=document.dynamiccombo.stage2
</script>
wanger_cn 2006-01-10
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<form name="dynamiccombo" method="post" runat="server">
<select name="stage2" size="0" onchange="displaysub()">
<option value="#1" selected>this is a place</option>
<option value="#2">this is a place</option>
<option value="#3">this is a place</option>
<option value="#4">this is a place</option>
</select>
<input type="button" name="btgo" value="GO!" onclick="gothere()">
</form>
<script language="javascript">
function gothere()
{
var cacheobj = document.dynamiccombo.stage2;
alert(cacheobj.value);
}
function displaysub()
{
var cacheobj = document.dynamiccombo.stage2;
alert(cacheobj.value);
}
</script>
<select name="stage2" size="0" onchange="displaysub()">
<option value="#1" selected>this is a place</option>
<option value="#2">this is a place</option>
<option value="#3">this is a place</option>
<option value="#4">this is a place</option>
</select>
<input type="button" name="btgo" value="GO!" onclick="gothere()">
</form>
<script language="javascript">
function gothere()
{
var cacheobj = document.dynamiccombo.stage2;
alert(cacheobj.value);
}
function displaysub()
{
var cacheobj = document.dynamiccombo.stage2;
alert(cacheobj.value);
}
</script>
singlezym 2006-01-10
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没错，即使多了个空格也不提示错的。把它输出，试一下：
<form name="dynamiccombo" method="post" runat="server">
<select name="stage2" size="0" onchange="displaysub()">
<option value="#1" selected>this is a place</option>
<option value="#2">this is a place</option>
<option value="#3">this is a place</option>
<option value="#4">this is a place</option>
</select>
<input type="button" name="btgo" value="GO!" onclick="gothere()">
</form>
<script language="javascript">
function gothere()
{
var cacheobj=document.dynamiccombo .stage2 ;
alert(cacheobj.value);
}
</script>
<form name="dynamiccombo" method="post" runat="server">
<select name="stage2" size="0" onchange="displaysub()">
<option value="#1" selected>this is a place</option>
<option value="#2">this is a place</option>
<option value="#3">this is a place</option>
<option value="#4">this is a place</option>
</select>
<input type="button" name="btgo" value="GO!" onclick="gothere()">
</form>
<script language="javascript">
function gothere()
{
var cacheobj=document.dynamiccombo .stage2 ;
alert(cacheobj.value);
}
</script>
jerrie_1 2006-01-10
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TO：
meizz(梅花雪)
查了一下源文件，为何变成这样
<form name="_ctl0" method="post" action="combo box.aspx" id="_ctl0">
meizz(梅花雪)
查了一下源文件，为何变成这样
<form name="_ctl0" method="post" action="combo box.aspx" id="_ctl0">
meizz 2006-01-10
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document.dynamiccombo .stage2
^ 这里好象多了一个空格
在浏览器里直接右键查看网页源代码，看看这个控件在浏览器的具体name，对应好就不会错了
^ 这里好象多了一个空格
在浏览器里直接右键查看网页源代码，看看这个控件在浏览器的具体name，对应好就不会错了
