59 lines
2.5 KiB
ReStructuredText
59 lines
2.5 KiB
ReStructuredText
Views
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=====
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The template parser reads views from the ``view`` subdirectory of a
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gluon-web application (``/lib/gluon/config-mode/view`` for the config mode,
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``lib/gluon/status-page/view`` for the status page).
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Writing own views should usually be avoided in favour of using :doc:`model`
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with their predefined views.
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Views are partial HTML pages, with additional template tags that allow
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to embed Lua code and translation strings. The following tags are defined:
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- ``<%`` ... ``%>`` evaluates the enclosed Lua expression.
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- ``<%=`` ... ``%>`` evaluates the enclosed Lua expression and prints its value.
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- ``<%+`` ... ``%>`` includes another template.
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- ``<%:`` ... ``%>`` translates the enclosed string using the loaded i18n catalog.
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- ``<%_`` ... ``%>`` translates the enclosed string *without escaping HTML entities*
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in the translation. This only makes sense when the i18n catalog contains HTML code.
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- ``<%#`` ... ``%>`` is a comment.
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All of these also come in the whitespace-stripping variants ``<%-`` and ``-%>`` that
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remove all whitespace before or after the tag.
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Complex combinations of HTML and Lua code are possible, for example:
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.. code-block:: text
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<div>
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<% if foo then %>
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Content
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<% end %>
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</div>
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Variables and functions
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-----------------------
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Many call sites define additional variables (for example, model templates can
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access the model as *self* and a unique element ID as *id*), but the following
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variables and functions should always be available for the embedded Lua code:
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- *renderer*: :ref:`web-controller-template-renderer`
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- *http*: :ref:`web-controller-http`
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- *request*: Table containing the path components of the current page
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- *url* (*path*): returns the URL for the given path, which is passed as a table of path components.
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- *attr* (*key*, *value*): Returns a string of the form ``key="value"``
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(with a leading space character before the key).
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*value* is converted to a string (tables are serialized as JSON) and HTML entities
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are escaped. Returns an empty string when *value* is *nil* or *false*.
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- *include* (*template*): Includes another template.
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- *node* (*path*, ...): Returns the controller node for the given page (passed as
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one argument per path component).
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Use ``node(unpack(request))`` to get the node for the current page.
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- *pcdata* (*str*): Escapes HTML entities in the passed string.
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- *urlencode* (*str*): Escapes the passed string for use in an URL.
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- *translate*, *_translate*, *translatef* and *i18n*: see :doc:`i18n`
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