Re: [web2py] html templates using < or >

[Jonathan Lundell]

On Mar 12, 2011, at 11:05 AM, pierreth wrote:
> 
> Hello,
> 
> I have small problem when the characters "< and ">" are used in web2py
> html template views. Using them for Python breaks the html:
> 
> {{="OK" if x < 0 else "bad"}}
> 
> Because these characters are not escaped in the code, the html file is
> no longer well formed.
> 
> Using the html entities "&lt;" and "&gr;" does not solve the problem
> because web2py gives an error when theses characters are used as
> Python code in templates.
> 
> Is it possible to fix this to have well formed html for web2py
> templates?

This is a consequence of the way the '=' (request.write) operator behaves at 
the beginning of a code block: it treats the entire string as its argument 
string, something like: request.write('"OK" if x < 0 else "bad"')

You can rewrite it to use request.write explicitly, or to put each = operator 
on its own line.

{{request.write("OK" if x < 0 else "bad")}}

or

{{if x < 0:
="OK"
else:
="bad"
pass
}}

(I think)

When the '=' operator is embedded in a code block, it consumes everything until 
the end of the physical line or code block, whichever comes first. When it 
begins a code block, it consumes the entire block.