以下是代码片段：
<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
<!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>
<script language="javascript">
function sel()
{
for(var i=0;i<form1.elements.length;i++)
{
if(form1.elements[i].name=="checkbox")
{
if(!form1.elements[i].checked)
{
form1.elements[i].checked=true;
}
else
{
form1.elements[i].checked=false
}
}
}
}
function xuan()
{
var num = 0;
for(i=0;i<form1.elements.length;i++)
{
if(form1.elements[i].name=="checkbox")
{
if(form1.elements[i].checked)
{
num+=1;
}
}
}
if(num==0)
{
alert('必须选一个！！');
return false;
}
else
{
if(num!=1)
{
alert('最多只能选一个！！');
return false;
}
}
return true;
}
</script>
</head>
<body>
<form name="form1" method="post" action="" onSubmit="return xuan()">
<table width="20" border="0">
<tr>
<td><input type="checkbox" name="checkbox" value="checkbox"></td>
</tr>
<tr>
<td><input type="checkbox" name="checkbox" value="checkbox"></td>
</tr>
<tr>
<td><input type="checkbox" name="checkbox" value="checkbox"></td>
</tr>
<tr>
<td><input type="checkbox" name="checkbox" value="checkbox" ></td>
</tr>
<tr>
<td><input type="button" name="Submit" value="按钮" onClick="sel()"></td>
</tr>
</table>
<textarea name="textarea">
</textarea>
<input type="submit" name="Submit2" value="提交">
</form>
</body>
</html> |
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