Programmer blog

Continuing those series of tasty features in Django 1.4. It's templates and newly added templatetags this time. Many things improved in template logic now. Lets move on point by point... Tag  {% elif %} For most of us it is almost killer feature of new Django 1.4. You will have simpler logic in your templates, if you have advanced logic there, of course. ;) Key-value arguments for user tags You can use key-value for tags along with old, positional, arguments, e.g.: { % custom_tag 123 "test" thing . var text = msg | upper username = user . get_full_name % } All of this implemented using common "args" and "kwargs": @register . simple_tag def custom_tag ( a , b , * args , * * kwargs ) : warning = kwargs [ 'text' ] profile = kwargs [ 'username' ] . . . return . . . assignment_tag Some tags are not built to output something in template, like simple_tag. They only have to change something in c...

Sometimes you have the task to decorate django form fields. In our case it was need to add different widget to form field depending on field type. You can know your field type by refering to it's python class name, e.g.: field . __class__ . __name__ You will get wrong symbols error if you try to refer this python variable in templates directly. So you need a custom template tag to serve here. Decision was not to return variable for tag but to add context variable, cause I had need to perform exact actions on certain field types. So tag example: @register . simple_tag ( takes_context = True ) def set_this_field_type ( context , field ) : """     Adds to context given field type variable     variable named "this_field_type"     """ context [ "this_field_type" ] = field . field . __class__ . __name__ return '' Now you can add this variable to your if statements. E.g. usage: {% ...