看书 <input type=checkbox name="hobby" value="1">
游泳 <input type=checkbox name="hobby" value="2">
爬山 <input type=checkbox name="hobby" value="3"> <br>
<input type=button value="提交" onclick="check()"><script language="javascript">
function check()
{
var n = 0;
var objs = document.all.hobby;
for(var i=0;i<objs.length;i++)
{
if(objs[i].checked)
n=n+1
}
if( n == 0 )
alert("至少选中一个");
else
alert("选中" + n + "个");
}
</script>
<html>
<head>
<title></title>
<script>
function check() {
var flag = true;
var boxes = document.getElementsByName("hobby");
for(var i = 0;(e = boxes[i]); i++){
flag = flag && !e.checked;
}
if(!flag){
alert("被提交");
}else{
alert("至少选择一项");
}
}
</script>
</head>
<body>
看书 <input type=checkbox name="hobby" value="1">
游泳 <input type=checkbox name="hobby" value="2">
爬山 <input type=checkbox name="hobby" value="3"> <br>
<input type=button value="提交" onclick="check()">
</body>
</html>
function check() {
var checkCount = 0;
var ids = document.getElementsByName("hobby");
for(i=0; i<ids.length; i ++) {
if (ids(i).checked) {
checkCount ++;
}
}
if (checkCount == 0) {
alert("至少选择一项");
return false;
} else {
if (confirm("您确认要选择这 " + checkCount + " 个选项吗？")) {
return true;
} else {
return false;
}
}
}
</SCRIPT>
看书 <input type=checkbox name="hobby" value="1">
游泳 <input type=checkbox name="hobby" value="2">
爬山 <input type=checkbox name="hobby" value="3"> <br>
<input type=button value="提交" onclick="check()">