VirtueMart

h1. 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]]