Developing a module or plugin for Virtuemart 2¶

When you want to develop your own extension for virtuemart, then this hints should you help to get started:

Use
if (!class_exists( 'VmConfig' )) require(JPATH_ADMINISTRATOR.DS.'components'.DS.'com_virtuemart'.DS.'helpers'.DS.'config.php');
to load the configuration object in your extension. Then use

VmConfig::loadConfig();

to load the configuration values, you can then easily access them with

VmConfig::get('yourVariable','default');

After loading the VmConfig you should always use the vm path constants to access files

JPATH_VM_SITE = JPATH_ROOT.DS.'components'.DS.'com_virtuemart' );
JPATH_VM_ADMINISTRATOR = JPATH_ROOT.DS.'administrator'.DS.'components'.DS.'com_virtuemart' );

For performance reasons you should always use the

if (!class_exists( 'MyClass' )) require (JPATH_VM_ADMINISTRATOR.DS....)

construction, dont use require_once

When you want to access the js used in vm then load them with

VmConfig::jQuery();
VmConfig::jPrice();

or for the css use
VmConfig::cssSite();

For shipment or payment plugin development please look here Plugin system for modules here Modules system