js判断radio是否被选中（一）

<
html
>

<
head
>

<
title
>

votejsp

<
/
title
>

<
script
language
=
"javascript"
type
=
"text/javascript"
>

<!--

function validate(){

var resualt=false;

for(var
i=0;i<document.frmvote.radiobutton.length;i++)

{

if(document.frmvote.radiobutton[i].checked)

{

resualt=true;

}

}

if(!resualt)

{

alert("
为啥不选一个捏~！");

}

return resualt;

}

-->

<
/
script
>

<
/
head
>

<
body
bgcolor
=
"#ffffff"
>

<
h1
>

关于购房热潮的调查问卷

<
/
h1
>

<
h3
>

问题1：如今房价居高不下，

<
/
h3
>

<
form
method
=
"post"
action
=
"voteservlet"
name
=
"frmvote"
onsubmit
=
"return(validate())"
>

<
br
>
<
br
>

请选择：<
br
/
>

<
input
type
=
"radio"
name
=
"radiobutton"
value
=
"A"
/
>
A
.
拥有一套货一套以上<
br
/
>

<
input
type
=
"radio"
name
=
"radiobutton"
value
=
"B"
/
>
B
.
还没有，不过计划要买<
br
/
>

<
input
type
=
"radio"
name
=
"radiobutton"
value
=
"C"
/
>
C.
有这个想法，不过
还没有<
br
/
>

<
input
type
=
"radio"
name
=
"radiobutton"
value
=
"D"
/
>
D.
没有这个
想法，不买房<
br
/
>

<
input
type
=
"submit"
name
=
"Submit"
value
=
"投票"
>

<
input
type
=
"reset"
value
=
"重新选择"
>

<
/
form
>

<
/
body
>

<
/
html
>