Anthony, I can't thank you enough for all your advises and help, not only i understand more about the grid / smartgrid, but the use of request.args now. I appreciate a lot of your time. Rudy
On Thursday, April 6, 2017 at 2:57:00 AM UTC+8, Anthony wrote: > > Pardon me for asking stupid question, what does SQLFORM.smartgrid(.....， >> args=request.args[:1], ...) really do? you mentioned in earlier post that >> args must be a list, and it preserves the 1st argument of URL for >> application specific use. Does it tell web2py whatever url it creates, it >> should always preserve the same URL up to the 1st argument (for this case) >> eg. http://localhost/tests/default/view_invoices/2? >> > > The grid builds its own internal URLs by taking the base URL of the action > that serves the grid and adding URL args. If you specify the "args" > parameter, it will first add any args from that to the URL before adding > any of its own args, thus preserving any args you are using for non-grid > purposes. > > >> I looked up the documentation, there is little info about args in grid / >> smartgrid signature. If above assumption is correct, if my applications >> uses first 2 args for specific application purpose, i should modify the >> code to SQLFORM.smartgrid(.....， args=request.args[:2], ...)? >> > > Correct. > > >> Another stupid question - what's difference between request.args[:1] and >> request.args(0)? >> > > The former produces a list (even if it contains zero items or one item), > whereas the latter returns an individual value. > > def view_invoices(): >> customer_id = request.args(0) >> if customer_id: >> > > This is not a helpful conditional because once you click on any link > produced by the grid, there will always be some value for request.args(0) > (because the grid will have added some URL args to the URLs it generates). > One option is something like: > > customer_id = request.args(0, cast=int, otherwise=lambda: None) > if customer_id is not None: > > The above will attempt to cast the first URL arg to an int and return None > otherwise. The grid doesn't use ints as the first URL arg, so if the above > returns None, that means there is no URL arg or it is not an int, which > implies that no customer_id has been specified. > > Anthony > -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
