Adding to checkbox - javascript?

[LArtJunky]

I have a product that can have 1 extra option
I want to be able to

Check boxes in form

O $20 for regular product
O Add $5 option (adds to $20 reg product price)

What's the best way to deal with this and what javascript would work for this?

[LArtJunky]

Anyone?

[John Doe]

LArtJunky wrote:

> I have a product that can have 1 extra option
> I want to be able to
>
> Check boxes in form
>
> O $20 for regular product
> O Add $5 option (adds to $20 reg product price)
>
> What's the best way to deal with this and what javascript would work for this?

add an onClick handler for each checkbox:

<INPUT name='regular' type='checkbox' onClick='calcTotal(this.checked,
this.value)' value=20>
<INPUT name='option' type='checkbox' onClick='calcTotal(this.checked,
this.value)' value=5>

i assume you have a TOTAL field so, define a function to update it
anytime a user select/unselect an option:

<SCRIPT>
function calcTotal(cbStatus, idx) {
str = document.yourForm.totalField.value;
totalVar = parseFloat(str);
idxn = parseInt(idx, 10);
if (cbStatus) {
totalVar = totalVar + idxn;
} else {
totalVar = totalVar - idxn;
}
document.yourForm.totalField.value = totalVar.toString();
}
</SCRIPT>

not tested, post again if you hace any problem

hth,

jdoe