See the end of this section in the book:
http://web2py.com/books/default/chapter/29/05#HTML-helpers
Notice that helper attributes are passed as keyword arguments to the
helper. In some cases, however, attribute names include special characters
that are not allowed in Python identifiers (e.g., hyphens) and therefore
cannot be used as keyword argument names. For example:
DIV('text', _data-role='collapsible')
will not work because "_data-role" includes a hyphen, which will produce a
Python syntax error.
In such cases, you can instead pass the attributes as a dictionary and make
use of Python's ** function arguments notation, which map a dictionary of
(key:value) pairs into a set of keyword arguments:
>>> print DIV('text', **{'_data-role': 'collapsible'})
<div data-role="collapsible">text</div>
And specifically for "data-*" attributes, you can now do:
form.element('input[id=what3]').update(
data={'content':'My text', 'toggle':'popover', 'original-title':'My
title'}, _title='')
HTML helpers can now take a "data" argument, which is a dict -- the keys of
the dict will be transformed into HTML attributes of the form "data-[key]".
Note, if the helper already has a "data" argument and you want to add more
data-* attributes, you would update the "data" dict itself, as follows:
form.element('input[id=what3]')['data'].update(newattribute='newvalue')
Anthony
On Thursday, April 4, 2013 5:52:34 AM UTC-4, Annet wrote:
>
> In a function I have the following code:
>
>
> form.element('input[id=what3]').update(_data-content="My text",
> _data-toggle="popover", _title="", _data-original-title="My title")
>
> This code cannot be saved, it result in a keyword can't be an expression
> error.
> data-content, data-toggle and data-original-title are bootstrap attributes
> why can't I use them this way?
>
>
>
> Annet
>
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