Li Dongfeng writes:
To use CSS file, I put the following line in the head of HTML files:
<dtml-if local_css> <link href="<dtml-var "local_css.absolute_url()">" rel="stylesheet" type="text/css"> </dtml-if>
Where "local_css" is a DTML document containing CSS style sheet. But the DTML generates the following error message:
Error Type: AttributeError Error Value: 'string' object has no attribute 'absolute_url'
If I strip the <dtml-if protection, the code works OK. Why is the DTML document local_css changed into a string after <dtml-if>? That is a dtml-if caveat!
The dtml-if documentation says that dtml-if caches its variable value to save time, in case the variable is in fact a function that takes long to call. What happens in your case: <dtml-if local_css> looks up "local_css" and because it is callable, it gets called (i.e. rendered). The result is a string. This string is bound to "local_css" inside the <dtml-if>...</dtml-if>. Therefore, "local_css.absolute_url" results in the error you observed. You can replace <dtml-if local_css> by <dtml-if "_.has_key(local_css)">. This will not be equivalent to "<dtml-if local_css>" but good enough for your purpose. If you want to emulate it more faithfull, you could use: <dtml-if "_.has_key(local_css) and _['local_css']"> This is equivalent ot "<dtml-if local_css>" with the exception of the caching. Dieter