See http://stackoverflow.com/questions/8146260/best-practice-for-populating-dropdown-based-on-other-dropdown-selection-in-web2p/8152910#8152910 for links to some other related recipes.
Anthony On Wednesday, August 29, 2012 3:04:10 AM UTC-4, lyn2py wrote: > > Thank you Anthony and Richard, I have tried to use IS_IN_DB in the form of > return IS_IN_DB(...) but it doesn't work. > > The reason why I am looking for this function is because I am trying to > load the options or a second field, based on what is chosen in the first > field. Both are SELECTs. > > Like this example here: > http://dev.s-cubism.com/plugin_lazy_options_widget > but the first field is a select instead of autocomplete. > > I am unable to find a function that will return a SELECT field (based on > the chosen rows) for the ajax success function. > > On Wednesday, August 29, 2012 12:50:13 AM UTC+8, Anthony wrote: >> >> Yes. By default, a reference field gets a validator like this: >> IS_IN_DB(db, db.sometable._id, db.sometable._format). However, the >> IS_IN_DB() validator can take a Set object as the first argument instead of >> db, and the list will be based on the records defined by that Set. In that >> case, you'll have to explicitly define the validator: >> >> requires=IS_IN_DB(db([your query]), db.sometable.id, db.sometable._format >> ) >> >> Note, when you define your own validator, you also lose the automatic >> "represent" attribute for the reference field, so you might want to set >> your own: >> >> represent=db.sometable._format >> >> Anthony >> >> On Tuesday, August 28, 2012 12:28:10 PM UTC-4, lyn2py wrote: >>> >>> Hello experts, >>> >>> Generally, when we do a SQLFORM, the 'reference table' fields >>> automatically gets *all* the available options for choosing as a dropdown >>> menu. >>> >>> However, I would like to get a filtered list instead of *all* of the >>> items. Is there an available function I can use to achieve a filtered list >>> for choosing in the dropdown menu? >>> >>> Another way to look at this is: >>> I would like to generate a SELECT/OPTIONS html using a specific query, >>> i.e. it uses the retrieved Rows to generate the HTML. I wonder if there is >>> a function in web2py for doing this. >>> >>> I hope my question is understood. Thank you. >>> >>> >>> PS. If there isn't an available function, I appreciate any tips or >>> pointers how I can make this work. Thanks! >>> >> --
