How to create a form limiting the number of registration

I want to create a registration form for training, but I also want to limit the number of entries for the simple reason that my training room has a limited number of places. How to do this?

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First step :

Add a "Whole number field", for example 'nb_inscriptions' with :

Minimum Acceptable Value = 1
Maximum Acceptable Value = 8
Field Help = "number of free places = 8"

Second step :

Add a script action name "decrement_place" and add in form action of your form. below the code for the script :

request = container.REQUEST
form = request.form

maxval = container.nb_inscriptions.fgField.maxval
nb_inscriptions = form.get('nb_inscriptions',None)

maxval = int(maxval) - int(nb_inscriptions)

if maxval < 0 : maxval = 0

message = 'number of free places : %d' % (maxval)

container.nb_inscriptions.setMaxval(maxval)
container.nb_inscriptions.setDescription(message)

Contact : Fabrice Monaco (fmonaco@cirb.irisnet.be), CIRB