JSP表单隐藏域通过JS设置

HTML

<form action="login.jsp" method="post" id="data">
<input type="button" value="login" class="op" name="oper" onclick="judge(this)" />
<input type="button" value="Sign up" class="op" name="oper" onclick="judge(this)"/>
<input type="hidden" id="snippet" name="choice" value="">
</form>

JS

<script>
//judge you will login or sign up
function judge(obj){
var choose=document.getElementsByName("oper");
for(var i=0;i<choose.length;i++){
if(obj==choose[i]){
var hidde=document.getElementById("snippet");
//set the value of hidden field
hidde.value=i;
//submit the form
document.getElementById("data").submit();

}
}

}

</script>