Accessing a list of params in controller - grails

Question

Im very new to grails (1.3.7) so please be patient :-)
I have a gsp where I have various checkboxes. A user can click on them and then send his answer to a controller. The controller is receiving this request correctly.
My problem is, that, for working with what the user chose, I have to check every parameter - to see if this checkbox was really checked. Thats really cumbersome and doesnt work very well, because the page displaying the checkboxes is dynamic - so the checkboxes which can be clicked are dynamic too. In my controller I dont know for which params I have to check then.
Is there any possibility to receive a list of all checkboxes (or better: all checked checkboxes) in my controller? I researched but didnt find an answer!
Thanks for answering! :-)
[EDIT]
Thank you,
params.name.each{i->
System.out.println(i);
}
is very simple and works :-) It just gives back the checked ones

Answer 1

It must be passed as an extra request parameter (it's a limitation of http). You can add following field into your form, for example:
<input type="hidden" name="checkboxes" value="${myCheckboxesNames.join(',')}"/>
or making same using JavaScript, as it names are dynamic on client side.
BTW, you can also check all request parameters, by
params.each { name, value ->
// so something
}
so if you are using some special prefix/suffix for this checkbox names, it would be:
params.entrySet().findAll {
it.key.startsWith(prefix)
}.each {
println "Checkbox $it.key = $it.value"
}