I am using latest Pyramid to build a web app. Somehow we have started using Chameleon as the template engine. I have used Mako before and it was extremely simple to create a base template. Is this possible with chameleon as well?
I have tried to look through the docs but I can not seem to find an easy solution.
With Chameleon >= 2.7.0 you can use the "load" TALES expression. Example:
main.pt:
<html>
<head>
<div metal:define-slot="head"></div>
</head>
<body>
<ul id="menu">
<li><a href="">Item 1</a></li>
<li><a href="">Item 2</a></li>
<li><a href="">Item 3</a></li>
</ul>
<div metal:define-slot="content"></div>
</body>
</html>
my_view.pt:
<html metal:use-macro="load: main.pt">
<div metal:fill-slot="content">
<p>Bonjour tout le monde.</p>
</div>
</html>
Another option, which was used prior Chameleon got an ability to load templates from the filesystem, is to pass the "base" template as a parameter.
To simplify things, I often wrap such stuff into a "theme" object:
class Theme(object):
def __init__(self, context, request):
self.context = context
self.request = request
layout_fn = 'templates/layout.pt'
@property
def layout(self):
macro_template = get_template(self.layout_fn)
return macro_template
@property
def logged_in_user_id(self):
"""
Returns the ID of the current user
"""
return authenticated_userid(self.request)
which can then be used like this:
def someview(context, request):
theme = Theme(context, request)
...
return { "theme": theme }
Which then can be used in the template:
<html
xmlns="http://www.w3.org/1999/xhtml"
xmlns:tal="http://xml.zope.org/namespaces/tal"
xmlns:metal="http://xml.zope.org/namespaces/metal"
metal:use-macro="theme.layout.macros['master']">
<body>
<metal:header fill-slot="header">
...
</metal:header>
<metal:main fill-slot="main">
...
</metal:main>
</body>
</html>
Make a template here:
<proj>/<proj>/templates/base.pt
with contents:
<html>
<body>
<div metal:define-slot="content"></div>
</body>
</html>
Use the template here:
<proj>/<proj>/templates/about_us.pt
by inserting the contents:
<div metal:use-macro="load: base.pt">
<div metal:fill-slot="content">
<p>Hello World.</p>
</div>
</div>
