custom maxlengths on create/edit grid

[JSalvat]

Hi,

How to custom an input field width   class='col-sm-x'  in create/edit forms that come from SQLFORM.grid

On SQLFORM can be done this way:

form = SQLFORM(db.movimiento)

if form.element('#movimiento_cantidad'):

     wclass = form.element('#movimiento_cantidad')['_class']

     form.element('#movimiento_cantidad')['_class'] = wclass + ' col-sm-3'

     form.element('#movimiento_cantidad')['_maxlength'] = 8

but when the form is generic from SQLFORM.grid  how can it be done?

Thanks for any help if it could be done.

[黄祥]

think there is maxtextlength attribute on sqlform.grid signature, but not sure if it suitable with your css class definition

ref:

http://web2py.com/books/default/chapter/29/07/forms-and-validators#SQLFORM-grid-signature

best regards,

stifan

[JSalvat]

Yes, but the  maxtextlength attribute works only on the grid, and I think is not accesible from the generic create/edit form created by the grid. How the maxtextlength attribute be used in the form?

[Anthony]

First, you can use the same approach with the grid that you are using with SQLFORM, as the grid simply produces a SQLFORM when creating or updating records. Note, web2py DOM objects have an .add_class() method, so you can use that instead of manually extracting and updating the "_class" attribute.

Another option is to specify a custom widget for the field in question, either when the db table is defined or later:

Field('cantidad', widget=lambda f, v: SQLFORM.widgets.string.widget(f, v, _class='col-sm-3', _maxlength=8))

Anthony

[JSalvat]

Thanks Anthony, this really does the perfect job, much simpler !!