Many thanks for the replies.
The name of the textboxes of which I want to sum up the values is
event[statistic_attributes][goals][][goals] . Will the proposed code
automatically update when I change a value in a textbox?
I put
<script type="text/javascript">
//<![CDATA[
var sum = $$('input[name="event[statistic_attributes][goals][]
[goals]"]').inject(0, function(memo, input) {
memo += parseFloat($F(input));
alert(memo);
return memo;
});
//]]>
</script>
on top of my page but no effect - the function is not called?
Also, how do I print the variable (memo) to my html?
Sorry for all the beginners questions...
Regards,
Stijn
On Apr 18, 6:01 pm, kangax <[EMAIL PROTECTED]> wrote:
> The value probably needs to be parsed first : )
>
> var sum = $$('input[name="amt[]"]').inject(0, function(memo, input) {
> memo += parseFloat($F(input));
> return memo;
>
> });
>
> - kangax
>
> On Apr 18, 11:43 am, Ken Snyder <[EMAIL PROTECTED]> wrote:
>
> > Brian Williams wrote:
> > > i don't believe there is a need to use a class if they share a name
> > > i.e. amt[]
>
> > > should be able to use something along the lines of...
>
> > > $F('amt').each().invoke(function {......})
> > > ...
>
> > Right on track. You'll need $$() and inject()--see
> > below.http://prototypejs.org/api/utility/dollar-dollarhttp://prototypejs.or...
>
> > - Ken Snyder
>
> > var sum = $$('input[name="amt[]"]').inject(0, function(memo, input) {
> > memo += input.value;
> > return memo;
>
> > });
>
> > or if you define a sum() method for arrays, you can use pluck():
>
> > Array.prototype.sum = function(){
> > for (var i = 0, sum = 0; i < this.length; sum += this[i++]);
> > return sum;
>
> > }
>
> > var sum = $$('input[name="amt[]"]').pluck('value').sum();
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