Depricated
Old original if statements are deprecated - use Twig instead.
#Example
{if:[stock]>0}<h3>Product available.</h3>{endif}
or
{if:"[name]"="Ivan"}<h3>Welcome [name]</h3>{endif}
#How to hide rows when search parameters not specified yet.
"I would like to see nothing and only when I search something I would like to see data."
To show or hide part of the layout use the IF statement
This is Catalog Page layout example:
{add}
{print}
{batchtoolbar:edit,publish,unpublish,refresh,delete}
{if:"{currenturl:string,where}"!=""}{catalog}{endif}
*fullname*
{search:fullname} *email*
{search:email} *date* Action
{searchbutton}
{pagination}
{if:"{currenturl:string,where}"!=""}{catalog}{endif} - is the condition.