Convert state of radiobutton => byte on send

I have asked a sortlike question on this group, but this is an other
approach for this problem.

I want to send information about a set of 8 radiobuttons to a device
that listens to TCP/IP on port 80.

I have 8 sets of radiobuttons, each has a on and off state.
When this form is send, I would like that the state of the buttons is
converted to a byte.

So button the on state of these buttons adds the following value to
the value that is send in the GET command.
Button 1 = 1
Button 2 = 2
Button 3 = 4
Button 4 = 8
Button 5 = 16
Button 6 = 32
Button 7 = 64
Button 8 = 128

So if button 1 and 8 are marked at the time the form is send, the
script adds the values of these buttons 1 + 128 = 129 and send this as
result of the form.

Can I do this easily?

In comp.lang.javascript message <ptsjf417lo2sceejf8m19perf9dreu8bfm (AT) 4ax (DOT)
com>, Sat, 18 Oct 2008 16:40:54, test (AT) testnospam (DOT) nl posted:

I have 8 sets of radiobuttons, each has a on and off state.
When this form is send, I would like that the state of the buttons is
converted to a byte.

Can I do this easily?

Apparently not. But I can : consider

<form> DEMO ONLY; lacks polish
<br>..0..1
<br><input type=radio name=x1><input type=radio name=x1> 1
<br><input type=radio name=x2><input type=radio name=x2> 2
<br><input type=radio name=x3><input type=radio name=x3> 4
<br><input type=radio name=x4><input type=radio name=x4> 8
<br><input type=radio name=x5><input type=radio name=x5> 16
<br><input type=radio name=x6><input type=radio name=x6> 32
<br><input type=radio name=x7><input type=radio name=x7> 64
<br><input type=radio name=x8><input type=radio name=x8> 128
<br>&nbsp; <input type=button value="?" onClick="Wot(this.form)">

<script>
function Wot(F) { var X=0, J=9
while (--J) X = X*2 + F["x"+J][1].checked
alert(X) }
</script>

There, F["x"+J] refers to a radiobutton pair.

It's a good idea to read the newsgroup c.l.j and its FAQ. See below.

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