form.name - dynamically set the name

[henryrhenryr]

Hello

I think this is a simple syntax question but I can't seem to find the answer so far...

I want my javascript to collect the value from a form input with the name

nType[731]

It has this name because in PHP this creates an array automatically.

The problem is that the number (731) is dynamic. I know a solution would be to send the number in the function call but I have already sent the number in another form field so it seems wasteful to send it twice.

I have tried the following:

num=731;
nTypeName="nType["+num+"]";
var v=form.nTypeName.value;
 

...and...

num=731;
var v=form.nType[num].value;
 

... and ...

num=731;
var v=form.["nType["+num+"]"].value;
 

Can anyone help?!

Thanks in advance...

Henry

[henryrhenryr]

OK... this always happens.

Someone else posted similar question which answered mine - sorry!

The solution was to reference the "elements" object in the form object.

so I used:

num=731;
formElements=form.elements;
var v=formElements["nType["+num+"]"].value;
 

[ticonetster]

OK... this always happens.

Someone else posted similar question which answered mine - sorry!

The solution was to reference the "elements" object in the form object.

so I used:

num=731;
formElements=form.elements;
var v=formElements["nType["+num+"]"].value;
 

I found this post and was really excited because i cant figure it out myself.

overview
I created a number of radio button groups dynamically called: wksStud_i
where i = the number of students.
so every student has its own set of 5 radio buttons
lets say we have 3 students on this example.

what i want to do is to check how many of the radio button groups are selected.
so if someone clicks on a radio button it calls a function and checks every element of the groups.

//studNum = number of students
//register = form name
//name = element name
for (i=1;i<=studNum;i++){
   var name = 'wksStud_'+i;
   for (j=0;j<document.register.name.length;j++){
      if(document.register.name[j].checked==true) {
         rChecked ++;
      }
   }
}
//i want to know how many radio groups have been selected, in other words how many students have a selecting
document.write(rChecked);
 

So i know the problem is that javascript is understanding 'name' to be a element name called 'name' and not my var name that I set.
So i need to let javascript now that i want document.regist er.[my variable name].
How do i do this?
You said Someone else posted a similar question, do you have a link to that post so i can maybe understand it?
Your help is greatly appreciated.

[acoder]

So i need to let javascript now that i want document.regist er.[my variable name].
How do i do this?

document.regist er.elements[name]... or document.forms["register"].elements[name].