Yes there are some trick in here. Everything happens in one line
db.person.organization.comment = ajax_create(db.person.organization)
the function ajax_create serves a double purpose:
1) it returns a helper instance that when you click on it it open a
modal window that contains a LOAD component. LOAD components in web2py
are loaded via ajax and all form submissions are trapped so they also
submitted via ajax too and the response stays into the modal window.
But where is the ajax callback function?
2) it acts as a callback function! How can it be? well, in web2py you
can raise HTTP. This means any piece of code, not just action can
return HTTP responses. If the ajax_create function detects a request
vars called _ajax_add set to a a value equal to the name of the field
passed as argument, it understand the client is doing the ajax
callback and it raise HTTP thus producing a response without
continuing execution of models and controllers. In this case it acts
as an action (even if defined in a model).
if request.get_vars._ajax_add==str(field):
... # this is acts as an action
raise
HTTP(200,crud.create(table,onaccept=update_select).xml(),...)
When the form is accepted it also sets a header variable called
'web2py-component-command'. This is executed by the ajax form trap
client-side. The command tells the client to replace the content of
the SELECT with the new one and close the modal.
I agree it is not easy but you do not really need to understand it to
use it.
Massimo
On Feb 20, 9:37 am, DenesL <denes1...@yahoo.ca> wrote:
> Aw crap! and here is little me thinking I know how to use web2py.
> This one requires some painfully detailed walk-through.
> Am I the only one?.
>
> On 20 feb, 02:39, mdipierro <mdipie...@cs.depaul.edu> wrote:
>
> > En even better solution.
>
> > Drop this code in your model somewhere:
>
> > def ajax_create(field,
> > value='create',
> > title='Add a new organizaiton',
> > height=100, width=600):
> > if not field.type.startswith('reference'):
> > raise SyntaxError, "can only be used with a reference field"
> > if not hasattr(field.requires,'options'):
> > raise SyntaxError, "cannot determine options from field
> > validator"
> > key = str(field).replace('.','_')
> > if request.get_vars._ajax_add==str(field):
> > def update_select(form):
> > options = TAG['']
> > (*[OPTION(v,_value=k,_selected=str(form.vars.id)==str(k)) \
> > for (k,v) in
> > field.requires.options()])
> > command = "jQuery('#
> > %s').html('%s');jQuery('#TB_closeWindowButton').click()" \
> > % (key,options.xml().replace("'","\'"))
> > response.headers['web2py-component-command'] = command
> > table = field._db[field.type[10:]]
> > raise
> > HTTP(200,crud.create(table,onaccept=update_select).xml(),**response.headers)
> > response.files.append('http://jquery.com/demo/thickbox/thickbox-
> > code/thickbox.js')
> > response.files.append('http://jquery.com/demo/thickbox/thickbox-
> > code/thickbox.css')
> > return TAG[''](
> > A(value,_class='thickbox',_title=title,
> > _href='#TB_inline?height=%s&width=%s&inlineId=TB_%s' %
> > (height,width,key)),
> > DIV(LOAD(request.controller,request.action,args=request.args,
> > vars=dict(_ajax_add=field),ajax=True),_id='TB_%s' %
> > key,_class='hidden'))
>
> > Then you just do:
>
> > db.define_table('organization',Field('name',notnull=True,unique=True),format='%
> > (name)s')
> > db.define_table('person',Field('name'),Field('organization',db.organization))
>
> > db.person.organization.comment = ajax_create(db.person.organization,
> > title='Add an Org.')
>
> > def index():
> > return dict(form=crud.create(db.person,request.args(0)))
>
> > Will work with any table/field that you already have.
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