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Django templates in NAV

In the future NAV should mainly use Django templates, falling back to cheetah on old subsystems.

Django systems

Something smart here

Context processors

Some features of the templates, such as debug, version number and account/user info and preferences requires context processors.

Context processors are not passed to templates by default with render_to_response(), a RequestContext object must be passed to render_to_response to get them.

Without the account_processor all user specific content in templates will not work.

render_to_response(
    'path/to/template',
     {'some_context': var},
     RequestContext(request)
)

Currently these context processors are: debug, account and nav_version.

=== Debug ===

Provides a SQL debug table at the bottom of every Django page if the DEBUG setting is set to true.

=== Account_processor ===

Provides the account object for the current user, a flag telling if he/she is an admin, messages for the user and the custom links found in the navbar (includes quick links).

=== nav_version ===

Returns the version number from nav.web.buildconf

==== Template blocks and variables ====

The base templates contains a number of template blocks and variables that both can be overwritten by subsystems.

^   Blocks   ^^
| base_header | The header. Doctype, HTML head section and the header parts of the html. |
| base_header_head | The head block. |
| base_header_title | The title of the page. |
| base_header_additional_head | Any additional content that should go inside the head tag. Ie. extra CSS or JavaScript |
| base_body_start | The opening body tag. |
| base_header_logo | The NAV logo. |
| base_header_navbar | The navigation bar with breadcrumbs, customizable navbar and quick-links. |
| base_header_navpath | Breadcrumb path. |
| base_content | The content of the page. This one should be overwritten by subsystems to display the content. |
| base_debug | Output from the debug preprocessor. |
| base_footer | The footer |

^   Variables   ^^
| title | Title of the page. Appears inside base_header_title so subsystems can use either one of them. |
| navpath | Breadcrumb path. Contains a list of tuples on the form (url, title). If url is None regular text is displayed, else you get an anchor. |
| navbar | Users navigation bar. Supplied from account_processor. |
| qlink1 and qlink2 | Quick link drop-downs. Supplied from account_processor. |
| nav_version | NAV Version, supplied from nav_version context preprocessor. |

===== Backwards compability =====

MainTemplate.tmpl in webfront/templates is the main cheetah template. Most other cheetah templates includes this.

Compability with Django templates are done seamless. The MainTemplate includes nav.webfront.compability.Cheetah which provides two methods called footer and header. These two methods are simply printed, and thus the header and footer appears.

==== Additional <head> content ====

If a subsystem that uses Cheetah wants additional meta/CSS/JavaScript and/or other content that should go in the HTML head section to work it must appear in a subclass of one of the "additional" methods defined in the MainTemplate.

The methods are: additionalMeta, additionalCSS, additionalJavaScript, additionalHead.

Ie. if a subsystem wants to use foobar.css, it must appear in additionalCSS as such:

<code>
#def additionalCSS
<link rel="stylesheet" type="text/css" href="foobar.css" />
#end def additionalCSS
devel/blueprints/django_template.1263384281.txt.gz · Last modified: 2010/01/13 12:04 by eide