Parts & Pages ------------- How do I override part of a part/page? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This is all just *standard* tri.declarative magic, but as you are likely new to it this might take a while to get used to. Let's say you created yourself a master template for your site. .. code-block:: python class BasePage(Page): title = html.h1('My awesome webpage') subtitle = html.h2('It rocks') .. raw:: html
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Which you can use like this: .. code-block:: python def index(request): class IndexPage(BasePage): body = 'body' return IndexPage(parts__subtitle__children__child='Still rocking...') .. raw:: html
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Here you can see that `Part` s (`Page` s are themselves `Part` s) form a tree and the direct children are gathered in the `parts` namespace. Here we overwrote a leaf of an existing namespace, but you can also add new elements or replace bigger parts (and most of the time it doesn't matter if you use the `class Meta` or the keyword arguments to init syntax): .. code-block:: python def index(request): class IndexPage(BasePage): title = html.img( attrs=dict( src='https://docs.iommi.rocks/en/latest/_static/logo_with_outline.svg', alt='iommi logo', width='70px', ), ) return IndexPage(parts__subtitle=None) .. raw:: html
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In the above we replaced the title and removed the subtitle element completely. The latter of which shows one of the gotchas as only `str`, `Part` and the django template types are gathered into the parts structure when a `Part` class definition is processed. As `None` is not an instance of those types, you can remove things by setting their value to `None`. .. _Page.title: How do I set the title of my page? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ As in the text shown in the browser status bar? .. code-block:: python Page(title='The title in the browser') Note that this is different from .. code-block:: python class MyPage(Page): title = Header('A header element in the dom') MyPage() Which is equivalent to: .. code-block:: python Page(parts__title=Header('A header element in the dom')) .. _Page.context: How do I specify the context used when a Template is rendered? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. code-block:: python def index(request): context = {'today': date.today()} class MyPage(Page): body = Template("""A django template was rendered on {{today}}.""") return MyPage(context=context) .. raw:: html
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You can also insert items in the context via the declaration. This not only makes the above shorter, but also makes it easy to write abstractions that can be extended later: .. code-block:: python Page( parts__body=Template("""A django template was rendered on {{today}}."""), context__today=date.today(), ) .. raw:: html
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