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URL parameters always
appear above State parameters.
We define URL parameters in much the same way, only this time we place them in
a tag named url. The URL parameters are automatically appended to the URI; this
means that we can access these parameters using JRequest.
These parameters are of particular use when we are creating a layout that is used
to display a single item, which is retrieved using a unique ID. If we use these
parameters to define an ID that is retrieved from a table, we should consider using
the, often overlooked, sql parameter type.
This example builds on the previous example, and adds the URL parameter id,
which is extracted from the #__myextension table:








My Layout
Description of my layout.

description="Item to display" query="SELECT id AS
value, title AS id FROM #__content" />


description="Some description of the parameter"
default="default value"/>
label="Show" description="Show/Hide something">
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Chapter 9
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The query might be slightly confusing if you are not familiar with the sql parameter
type.


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