How to check if user has inputed all the fields in a form?

[Stephen Wei]

Hello all:
Can someone please teach me the Javascript for the following story?
I generate a JSP page which contains one form in it. The total number of the radio boxes and the names of the radio boxes are generated dynamically by JSP, so Java Script can not call one radio box directly.
When the user submits the form, I want my JavaScript to check for all the inputs, if one input in the form is null, then it returns an error.
How to do this by JavaScript? I have the form name, but what collections or methods or I use?
Thanks!

[Sandeep. Oza]

Hi! Stephen,
First when you load radio boxes dynamicall by jsp atleast checked one as default...
try following code..in Javascript
function check() {
var valid=false;
j=0;
for(i=0; i< document.formname.length; i++) {
e = document.formname.elements[i];
if (e.type=='checkbox' && e.checked) {
j++;
}//end of if
}//end of for
if (j==0) {
alert("Select a box before submitting this form");
return valid = false;
}//end of if
}//end of function check
First write form name...in html or along with jsp also.
then generet radios by jsp..
and write script in heah tag.
Best Wishes.
S. Oza