On 27 February 2013 17:16, Jonathan Vanasco <[email protected]> wrote:
> In mako templates, then it's just...
>
> <li class="${request.NavTabs.home}">Home</li>
> <li class="${request.NavTabs.about}">About</li>
>
> IIRC, tal allows for conditional attributes
In Chameleon, which implements its own dialect of TAL, we have the
pipe operator ("|"):
${request.NavTabs.home|nothing}
Meaning that if the first expression raises an exception, then we try
the next one and so forth.
But sometimes it makes more sense to use the ternary conditional operator:
${'active' if request.NavTabs.active else 'inactive'}
I think the pipe operator is best for things like:
${request.came_from|came_from|nothing}
Note that you can put whitespace around it if you want to.
\malthe
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