Displaying a list of checkboxes in my form - forms

Question

I want to display many checkboxes inline like:
<label class="checkbox-inline">
<input type="checkbox" id="inlineCheckboxA" value="optionA"> A
</label>
<label class="checkbox-inline">
<input type="checkbox" id="inlineCheckboxB" value="optionB"> B
</label>
<label class="checkbox-inline">
<input type="checkbox" id="inlineCheckboxC" value="optionC"> C
</label>
So I have my form like:
val form: Form[SearchForm] = Form(
mapping(
"letters" -> list(text)
)
)(SearchForm.apply)(SearchForm.unapply _)
Can I somehow pre-populate my form with the data or do I have to pass another variable with my view that has this 'letters' data?
val letters = List[String]("A", "B", "C", ...)
If I can't pass this letters val down with my view, then I guess I just pass another variable with my model and just iterate over it?

Answer 1

Have you looked at the helper inputCheckboxGroup ?
That will pre-populate the form elements from your model but you'll still have to provide the checkbox group with the set of possible values.
For example:
#views.html.helper.inputCheckboxGroup(
form("letters"),
options = Seq("A" -> "alpha", "B" -> "beta", "C" -> "gamma"),
'_label -> "My cool checkbox"
)
and the form filled with:
val form: Form[SimpleForm] = Form(mapping(
"letters" -> list(text)
)(SimpleForm.apply)(SimpleForm.unapply))
SimpleForm.form.fill(SimpleForm(List("A", "B")))
Would render a checkbox group like this:
[x] alpha [x] beta [ ] gamma