Sometimes you want to use a form value that the user has set, but want it
to be initialized if not already present. The [default ...] tag will do that.
Other times, you want to initialize a variable based on a database value.
The [lookup ...] tag will perform a lookup in an arbitrary database and set return that
value only if the user form value is not set.
[default name="variable" default="default value" set=1*]
HTML example: <PARAM MV=``default'' MV.NAME=variable MV.DEFAULT=``default'' MV. set=1>
Returns the value of the user form variable variable if it is non-empty. Otherwise returns default, which is the string ``default'' if there is no default supplied. Got
that?
If the flag set is present and non-zero, then the variable will be set to the default and no value returned to the page. This allows you to initialize things like country, shipping mode, and
other values on a checkout page.
[lookup table="database" col="column" key=row value="[value name]"]
This is essentially same as the following:
[if value name]
[then][value name][/then]
[else][data database column row][/else]
[/if]