There is a new feature in trunk with needs help testing. The syntax is not
yet finalized and may change. I allows to make some form fields conditional
on the values of other fields. To use it you must get web2py trunk and
clone welcome. To use in legacy apps you must still upgrade and replace
your static/js/web2py.js with the one in welcome.
Here are 3 examples:
def index():
""" shows bb only if aa is checked """
db.define_table('thing', Field('aa','boolean'),Field('bb'))
db.thing.bb.show_if = db.thing.aa==True
form = SQLFORM(db.thing)
return locals()
def index():
""" shows bb only when aa is not set to "x" """
db.define_table('thing', Field('aa','boolean'),Field('bb'))
db.thing.aa.requires=IS_IN_SET(('x','y','z'))
db.thing.bb.show_if = db.thing.aa!='x'
form = SQLFORM(db.thing)
return locals()
def index():
""" shows bb only when one types "x" or "y" in aa"""
db.define_table('thing', Field('aa','boolean'),Field('bb'))
db.thing.bb.show_if = db.thing.aa.belongs(('x','y'))
db.thing.bb.show_if = db.thing.aa==True
form = SQLFORM(db.thing)
return locals()
show_if is a DAL expression wich is converted to jQuery code and embedded
in the form. Not all expressions are supported only ==, !=, contains, and
belongs. No logical expressions (&, |). We could add them but I personally
believe we should keep this simple.
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