Magento Uses a fantastic Event hooking System that enables us to add additional functionality as plug-in without modifying our Code. Here is the List of Observers :
Magento
|
Module
|
Event Name
|
Mage
|
Admin
|
admin_session_user_login_success
|
Mage
|
Admin
|
admin_session_user_login_failed
|
Mage
|
Admin
|
admin_user_authenticate_after
|
Mage
|
Adminhtml
|
adminhtml_block_html_before
|
Mage
|
Adminhtml
|
adminhtml_catalog_category_tabs
|
Mage
|
Adminhtml
|
adminhtml_catalog_category_tree_is_moveable
|
Mage
|
Adminhtml
|
adminhtml_catalog_category_tree_can_add_root_category
|
Mage
|
Adminhtml
|
adminhtml_catalog_category_tree_can_add_sub_category
|
Mage
|
Adminhtml
|
adminhtml_product_attribute_types
|
Mage
|
Adminhtml
|
adminhtml_catalog_product_edit_prepare_form
|
Mage
|
Adminhtml
|
adminhtml_catalog_product_edit_element_types
|
Mage
|
Adminhtml
|
adminhtml_catalog_product_attribute_set_main_html_before
|
Mage
|
Adminhtml
|
adminhtml_catalog_product_attribute_set_toolbar_main_html_before
|
Mage
|
Adminhtml
|
adminhtml_catalog_product_form_prepare_excluded_field_list
|
Mage
|
Adminhtml
|
adminhtml_catalog_product_edit_prepare_form
|
Mage
|
Adminhtml
|
adminhtml_catalog_product_edit_element_types
|
Mage
|
Adminhtml
|
adminhtml_catalog_product_edit_tab_attributes_create_html_before
|
Mage
|
Adminhtml
|
adminhtml_cms_page_edit_tab_content_prepare_form
|
Mage
|
Adminhtml
|
adminhtml_cms_page_edit_tab_design_prepare_form
|
Mage
|
Adminhtml
|
adminhtml_cms_page_edit_tab_main_prepare_form
|
Mage
|
Adminhtml
|
adminhtml_cms_page_edit_tab_meta_prepare_form
|
Mage
|
Adminhtml
|
adminhtml_widget_grid_filter_collection
|
Mage
|
Adminhtml
|
adminhtml_widget_container_html_before
|
Mage
|
Adminhtml
|
adminhtml_controller_action_predispatch_start
|
Mage
|
Adminhtml
|
adminhtml_customer_prepare_save
|
Mage
|
Adminhtml
|
adminhtml_customer_save_after
|
Mage
|
Adminhtml
|
on_view_report
|
Mage
|
Adminhtml
|
catalog_category_prepare_save
|
Mage
|
Adminhtml
|
catalog_controller_category_delete
|
Mage
|
Adminhtml
|
catalog_product_new_action
|
Mage
|
Adminhtml
|
catalog_product_edit_action
|
Mage
|
Adminhtml
|
catalog_product_prepare_save
|
Mage
|
Adminhtml
|
catalog_controller_product_delete
|
Mage
|
Adminhtml
|
catalog_product_to_website_change
|
Mage
|
Adminhtml
|
cms_page_prepare_save
|
Mage
|
Adminhtml
|
adminhtml_cmspage_on_delete
|
Mage
|
Adminhtml
|
adminhtml_cmspage_on_delete
|
Mage
|
Adminhtml
|
admin_permissions_role_prepare_save
|
Mage
|
Adminhtml
|
adminhtml_controller_catalogrule_prepare_save
|
Mage
|
Adminhtml
|
adminhtml_controller_salesrule_prepare_save
|
Mage
|
Adminhtml
|
adminhtml_sales_order_create_process_data
|
Mage
|
Adminhtml
|
adminhtml_sales_order_creditmemo_register_before
|
Mage
|
Adminhtml
|
admin_system_config_changed_section_{$section}
|
Mage
|
Adminhtml
|
store_group_save
|
Mage
|
Adminhtml
|
store_edit
|
Mage
|
Adminhtml
|
store_add
|
Mage
|
Adminhtml
|
store_delete
|
Mage
|
Adminhtml
|
sales_convert_order_to_quote
|
Mage
|
Adminhtml
|
sales_convert_order_item_to_quote_item
|
Mage
|
Api
|
api_user_authenticated
|
Mage
|
Bundle
|
bundle_product_view_config
|
Mage
|
Bundle
|
prepare_catalog_product_index_select
|
Mage
|
Bundle
|
prepare_catalog_product_price_index_table
|
Mage
|
Bundle
|
catalog_product_prepare_index_select
|
Mage
|
Bundle
|
catalog_product_get_final_price
|
Mage
|
Catalog
|
catalog_block_product_list_collection
|
Mage
|
Catalog
|
catalog_product_view_config
|
Mage
|
Catalog
|
catalog_product_upsell
|
Mage
|
Catalog
|
catalog_controller_category_init_before
|
Mage
|
Catalog
|
catalog_controller_category_init_after
|
Mage
|
Catalog
|
catalog_controller_product_init_before
|
Mage
|
Catalog
|
catalog_controller_product_init
|
Mage
|
Catalog
|
catalog_controller_product_init_after
|
Mage
|
Catalog
|
catalog_controller_product_view
|
Mage
|
Catalog
|
catalog_product_compare_add_product
|
Mage
|
Catalog
|
catalog_product_compare_remove_product
|
Mage
|
Catalog
|
catalog_helper_output_construct
|
Mage
|
Catalog
|
catalog_category_tree_move_before
|
Mage
|
Catalog
|
$this→_eventPrefix.’_move_before’
|
Mage
|
Catalog
|
$this→_eventPrefix.’_move_after’
|
Mage
|
Catalog
|
catalog_category_tree_move_after
|
Mage
|
Catalog
|
category_move
|
Mage
|
Catalog
|
$this→_eventPrefix.’_validate_before’
|
Mage
|
Catalog
|
$this→_eventPrefix.’_validate_after’
|
Mage
|
Catalog
|
catalog_model_product_duplicate
|
Mage
|
Catalog
|
catalog_product_is_salable_before
|
Mage
|
Catalog
|
catalog_product_is_salable_after
|
Mage
|
Catalog
|
$this→_eventPrefix.’_delete_after_done’
|
Mage
|
Catalog
|
catalog_product_import_after
|
Mage
|
Catalog
|
catalog_product_website_update_before
|
Mage
|
Catalog
|
catalog_product_website_update
|
Mage
|
Catalog
|
catalog_product_status_update
|
Mage
|
Catalog
|
catalog_product_get_final_price
|
Mage
|
Catalog
|
catalog_category_change_products
|
Mage
|
Catalog
|
$this→_eventPrefix .
‘_load_before’
|
Mage
|
Catalog
|
$this→_eventPrefix .
‘_load_after’
|
Mage
|
Catalog
|
$this→_eventPrefix .
‘_add_is_active_filter’
|
Mage
|
Catalog
|
catalog_category_tree_init_inactive_category_ids
|
Mage
|
Catalog
|
catalog_category_tree_init_inactive_category_ids
|
Mage
|
Catalog
|
catalog_category_tree_move_before
|
Mage
|
Catalog
|
catalog_category_tree_move_after
|
Mage
|
Catalog
|
$this→_eventPrefix .
‘_load_before’
|
Mage
|
Catalog
|
$this→_eventPrefix .
‘_load_after’
|
Mage
|
Catalog
|
$this→_eventPrefix .
‘_add_is_active_filter’
|
Mage
|
Catalog
|
catalogindex_prepare_price_select
|
Mage
|
Catalog
|
catalog_prepare_price_select
|
Mage
|
Catalog
|
catalog_product_collection_load_before
|
Mage
|
Catalog
|
catalog_product_collection_load_after
|
Mage
|
Catalog
|
catalog_product_collection_before_add_count_to_categories
|
Mage
|
Catalog
|
catalog_product_collection_apply_limitations_after
|
Mage
|
Catalog
|
catalog_product_compare_item_collection_clear’
|
Mage
|
Catalog
|
catalog_product_flat_prepare_columns
|
Mage
|
Catalog
|
catalog_product_flat_prepare_indexes
|
Mage
|
Catalog
|
catalog_product_flat_rebuild
|
Mage
|
Catalog
|
catalog_product_flat_update_product
|
Mage
|
Catalog
|
prepare_catalog_product_index_select
|
Mage
|
Catalog
|
prepare_catalog_product_index_select
|
Mage
|
Catalog
|
prepare_catalog_product_index_select
|
Mage
|
Catalog
|
prepare_catalog_product_index_select
|
Mage
|
Catalog
|
prepare_catalog_product_price_index_table
|
Mage
|
Catalog
|
prepare_catalog_product_price_index_select
|
Mage
|
CatalogIndex
|
catalogindex_plain_reindex_after
|
Mage
|
CatalogIndex
|
catalogindex_prepare_price_select
|
Mage
|
CatalogIndex
|
catalogindex_get_minimal_price
|
Mage
|
CatalogIndex
|
catalogindex_prepare_price_select
|
Mage
|
CatalogIndex
|
catalogindex_prepare_price_select
|
Mage
|
CatalogIndex
|
catalogindex_prepare_price_select
|
Mage
|
CatalogIndex
|
catalogindex_prepare_price_select
|
Mage
|
CatalogRule
|
catalogrule_before_apply
|
Mage
|
CatalogRule
|
catalogrule_after_apply
|
Mage
|
CatalogSearch
|
catalogsearch_reset_search_result’
|
Mage
|
Checkout
|
checkout_cart_add_product_complete
|
Mage
|
Checkout
|
checkout_controller_multishipping_shipping_post
|
Mage
|
Checkout
|
checkout_multishipping_controller_success_action’
|
Mage
|
Checkout
|
checkout_onepage_controller_success_action’
|
Mage
|
Checkout
|
checkout_controller_onepage_save_shipping_method
|
Mage
|
Checkout
|
checkout_allow_guest
|
Mage
|
Checkout
|
checkout_cart_product_add_after
|
Mage
|
Checkout
|
checkout_cart_update_items_before
|
Mage
|
Checkout
|
checkout_cart_update_items_after
|
Mage
|
Checkout
|
checkout_cart_info_item_unset_product_before
|
Mage
|
Checkout
|
checkout_quote_init
|
Mage
|
Checkout
|
checkout_quote_destroy
|
Mage
|
Checkout
|
checkout_type_multishipping_set_shipping_items
|
Mage
|
Checkout
|
checkout_type_multishipping_create_orders_single
|
Mage
|
Checkout
|
checkout_type_onepage_save_order
|
Mage
|
Checkout
|
checkout_type_onepage_save_order_after
|
Mage
|
Cms
|
cms_controller_router_match_before
|
Mage
|
Cms
|
cms_page_get_available_statuses
|
Mage
|
Core
|
core_block_abstract_prepare_layout_before
|
Mage
|
Core
|
core_block_abstract_prepare_layout_after
|
Mage
|
Core
|
core_block_abstract_to_html_before
|
Mage
|
Core
|
core_block_abstract_to_html_after
|
Mage
|
Core
|
http_response_send_before
|
Mage
|
Core
|
controller_action_layout_load_before
|
Mage
|
Core
|
controller_action_layout_generate_xml_before
|
Mage
|
Core
|
controller_action_layout_generate_blocks_before
|
Mage
|
Core
|
controller_action_layout_generate_blocks_after
|
Mage
|
Core
|
controller_action_layout_render_before’
|
Mage
|
Core
|
controller_action_layout_render_before_’.$this→getFullActionName()
|
Mage
|
Core
|
controller_action_predispatch
|
Mage
|
Core
|
controller_action_predispatch_’.$this→getRequest()→getRouteName()
|
Mage
|
Core
|
controller_action_predispatch_’.$this→getFullActionName()
|
Mage
|
Core
|
controller_action_postdispatch_’.$this→getFullActionName()
|
Mage
|
Core
|
controller_action_postdispatch_’.$this→getRequest()→getRouteName()
|
Mage
|
Core
|
controller_action_postdispatch
|
Mage
|
Core
|
controller_action_noroute
|
Mage
|
Core
|
controller_action_nocookies
|
Mage
|
Core
|
controller_front_init_before
|
Mage
|
Core
|
controller_front_init_routers
|
Mage
|
Core
|
model_load_after
|
Mage
|
Core
|
$this→_eventPrefix.’_load_after’
|
Mage
|
Core
|
model_save_commit_after
|
Mage
|
Core
|
$this→_eventPrefix.’_save_commit_after’
|
Mage
|
Core
|
model_save_before
|
Mage
|
Core
|
$this→_eventPrefix.’_save_before’
|
Mage
|
Core
|
model_save_after
|
Mage
|
Core
|
$this→_eventPrefix.’_save_after’
|
Mage
|
Core
|
model_delete_before
|
Mage
|
Core
|
$this→_eventPrefix.’_delete_before’
|
Mage
|
Core
|
model_delete_after
|
Mage
|
Core
|
$this→_eventPrefix.’_delete_after’
|
Mage
|
Core
|
model_delete_commit_after
|
Mage
|
Core
|
$this→_eventPrefix.’_delete_commit_after’
|
Mage
|
Core
|
application_clean_cache
|
Mage
|
Core
|
core_locale_set_locale
|
Mage
|
Core
|
resource_get_tablename
|
Mage
|
Core
|
core_layout_update_updates_get_after
|
Mage
|
Core
|
core_layout_update_updates_get_after
|
Mage
|
Core
|
core_collection_abstract_load_before
|
Mage
|
Core
|
core_collection_abstract_load_after
|
Mage
|
Customer
|
customer_registration_is_allowed
|
Mage
|
Customer
|
customer_customer_authenticated
|
Mage
|
Customer
|
customer_session_init
|
Mage
|
Customer
|
customer_login
|
Mage
|
Customer
|
customer_login
|
Mage
|
Customer
|
customer_login
|
Mage
|
Customer
|
customer_logout
|
Mage
|
Eav
|
adminhtml_block_eav_attribute_edit_form_init
|
Mage
|
Eav
|
eav_attribute_get_backend_type_by_input
|
Mage
|
Eav
|
eav_attribute_get_default_value_by_input
|
Mage
|
Eav
|
eav_collection_abstract_load_before
|
Mage
|
GoogleCheckout
|
google_checkout_discount_item_price
|
Mage
|
Log
|
log_log_clean_before
|
Mage
|
Log
|
log_log_clean_after
|
Mage
|
Log
|
log_visitor_collection_load_before
|
Mage
|
Oscommerce
|
store_add
|
Mage
|
Payment
|
payment_method_is_active
|
Mage
|
Paypal
|
checkout_type_onepage_save_order
|
Mage
|
Paypal
|
checkout_type_onepage_save_order
|
Mage
|
PaypalUk
|
checkout_type_onepage_save_order
|
Mage
|
PaypalUk
|
checkout_type_onepage_save_order
|
Mage
|
Review
|
review_controller_product_init_before
|
Mage
|
Review
|
review_controller_product_init
|
Mage
|
Review
|
review_controller_product_init_after
|
Mage
|
Review
|
review_review_collection_load_before
|
Mage
|
Rss
|
rss_catalog_category_xml_callback
|
Mage
|
Rss
|
rss_catalog_new_xml_callback
|
Mage
|
Rss
|
rss_catalog_special_xml_callback
|
Mage
|
Rss
|
rss_catalog_tagged_item_xml_callback
|
Mage
|
Rss
|
rss_order_new_collection_select
|
Mage
|
Rule
|
rule_environment_collect
|
Mage
|
Sales
|
sales_order_place_before
|
Mage
|
Sales
|
sales_order_place_after
|
Mage
|
Sales
|
sales_quote_remove_item
|
Mage
|
Sales
|
sales_quote_add_item
|
Mage
|
Sales
|
$this→_eventPrefix .
‘_collect_totals_before’
|
Mage
|
Sales
|
$this→_eventPrefix .
‘_collect_totals_after’
|
Mage
|
Sales
|
$this→_eventPrefix .
‘_merge_before’
|
Mage
|
Sales
|
$this→_eventPrefix .
‘_merge_after’
|
Mage
|
Sales
|
sales_convert_order_to_quote
|
Mage
|
Sales
|
sales_convert_quote_to_order
|
Mage
|
Sales
|
sales_convert_quote_address_to_order
|
Mage
|
Sales
|
sales_convert_quote_address_to_order_address
|
Mage
|
Sales
|
sales_convert_quote_payment_to_order_payment
|
Mage
|
Sales
|
sales_convert_quote_item_to_order_item
|
Mage
|
Sales
|
sales_quote_item_collection_products_after_load
|
Mage
|
Sales
|
sales_sale_collection_query_before
|
Mage
|
Sales
|
sales_order_creditmemo_refund
|
Mage
|
Sales
|
sales_order_creditmemo_cancel
|
Mage
|
Sales
|
sales_order_invoice_pay
|
Mage
|
Sales
|
sales_order_invoice_cancel
|
Mage
|
Sales
|
sales_order_item_cancel
|
Mage
|
Sales
|
sales_order_payment_place_start
|
Mage
|
Sales
|
sales_order_payment_place_end
|
Mage
|
Sales
|
sales_order_payment_capture
|
Mage
|
Sales
|
sales_order_payment_pay
|
Mage
|
Sales
|
sales_order_payment_cancel_invoice
|
Mage
|
Sales
|
sales_order_payment_void
|
Mage
|
Sales
|
sales_order_payment_refund
|
Mage
|
Sales
|
sales_order_payment_cancel_creditmemo
|
Mage
|
Sales
|
sales_order_payment_cancel
|
Mage
|
Sales
|
sales_quote_item_qty_set_after
|
Mage
|
Sales
|
sales_quote_item_set_product
|
Mage
|
Sales
|
$this→_eventPrefix .
‘_import_data_before’
|
Mage
|
Sales
|
sales_quote_address_discount_item
|
Mage
|
Sales
|
sales_quote_address_discount_item
|
Mage
|
SalesRule
|
salesrule_validator_process
|
Mage
|
SalesRule
|
sales_quote_address_discount_item
|
Mage
|
SalesRule
|
sales_quote_address_discount_item
|
Mage
|
SalesRule
|
salesrule_rule_condition_combine
|
Mage
|
Sendfriend
|
sendfriend_product
|
Mage
|
Tag
|
tag_tag_product_collection_load_after
|
Mage
|
Tax
|
tax_rate_data_fetch
|
Mage
|
Tax
|
tax_settings_change_after’
|
Mage
|
Tax
|
tax_settings_change_after’
|
Mage
|
Tax
|
tax_settings_change_after’
|
Mage
|
Tax
|
tax_settings_change_after’
|
Mage
|
Tax
|
tax_settings_change_after’
|
Mage
|
Wishlist
|
wishlist_add_product
|
Mage
|
Wishlist
|
wishlist_share
|
