Application programming interface. The published methods for using a set of programs. In Joomla, the API refers to the public methods and fields of all the defined classes, especially ones in the Joomla platform. Because third-party programs rely on the API, it should be changed as infrequently as possible and always with advanced notice.

#	Дата	Сумма	Источник
1	07.07.2015	+40$
2	07.07.2015	-60$	Квартплата
3	08.07.2015	+120$

Пример использования события onClick.

Пример использования события onMouseDown и onMouseUp.

Adjusting a core Joomla file (i.e., the files that you uploaded before installing Joomla!). Any changes you make to core files will be overwritten during the next update, thus core hack is not recommended. In most cases, there are alternative workaround to change Joomla without hacking the core.