List the number of selected values in a dropdown

[louis037]

Hello, I want to count the number of selected values in a dropdown in order to show it in a field.

My jquery code to get the number of options works fine :

var selectTrainees = $('data_trainings___trainings_trainnes').length;
var numberTrainees = $('data_trainings___training_total_trainees');
if (selectTrainees !== '') {
numberTrainees.value = selectTrainees;
}

Could you help me, it shoud be very tricky... Thanks

 

[Bauer]

I cut an pasted your thread title ("List the number of selected values in a dropdown") into Google and this is the first on the list....
How to get number of selected options using jquery? - Stack Overflow

 

[cheesegrits]

If you are doing this in a JS 'change' (or 'click') event on the element with the options you want to count, this would do it ...

this.form.formElement.get('data_trainings___training_total_trainees').update(this.getValue().length);

-- hugh

 

[louis037]

Thanks guys, I'll test it right now! Add tell you it it works.

 

[louis037]

Well... May I have to put in into javascript event ? like that :

 

[louis037]

I tested it like that :

var selectTrainees = $('data_trainings___trainings_trainees').getValue();
var number = $('data_trainings___trainings_trainees').getValue().length;
var numberTrainees = $('data_trainings___training_total_trainees');
if (selectTrainees !== '') {
numberTrainees.value = number;
}

This doesn't work, the console says : SyntaxError: missing ) after condition

 

[Bauer]

Why not use a calc element?
Try this code as the Calculation...

$trainees = '{data_trainings___trainings_trainees_raw}';
return count(explode(',',$trainees));

 

[louis037]

Thank you Bauer,
I don't use calc element because when I activate it, the form doesn't load, even if I write

return '1';

in it. I don't know why???? I use the last fabrik release.