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<body>
<input name="radio1" type="radio" value="test">
<button onClick="alert('單選項'+(document.getElementsByName('radio1')[0].checked? '':'沒有')+'選中')">測試</button><br>
<input name="radio1" type="radio" value="test">
<button onClick="alert('單選項'+(document.getElementsByName('radio1')[1].checked?'':'沒有')+'選中')">測試</button><br>
<input name="checkbox1" type="checkbox" value="test">
<button onClick="alert('多選項'+(document.getElementsByName('checkbox1')[0]. checked?'':'沒有')+'選中')">測試</button><br>
<input name="checkbox1" type="checkbox" value="test">
<button onClick="alert('多選項'+(document.getElementsByName('checkbox1')[1].checked?'':'沒有')+'選中')">測試</button>
提示：getEmementsByName方法的作用是根據 NAME 標籤屬性的值擷取對象的集合。
</body>
</html>
範例二：
<form name="myform" action="" method="" onsubmit="return check()">
<input type="radio" name="picno" value="1">
<input type="radio" name="picno" value="2">
<input type="radio" name="picno" value="3">
<input type="submit" value="Submit">
</form>
<script language="JavaScript">...
function check()...{
var flag=0
for(i=0;i<myform.picno.length;i++)
if(myform.picno[i].checked==true)...{
flag=1
break
}
if(!flag)...{
alert("請先選擇更換圖片的位置")
return false
}
}
</script>
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