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Event bubbling is a type of DOM event propagation [1] where the event first triggers on the innermost target element, and then successively triggers on the ancestors (parents) of the target element in the same nesting hierarchy till it reaches the outermost DOM element or document object [2] (Provided the handler is initialized).
click onclick Fires when the pointing device button is clicked over an element. A click is defined as a mousedown and mouseup over the same screen location. The sequence of these events is: mousedown; mouseup; click; Yes Yes dblclick ondblclick Fires when the pointing device button is double-clicked over an element Yes Yes mousedown onmousedown
A web page and its JavaScript typically run in a single-threaded web browser process. The browser process deals with messages from a queue one at a time. A JavaScript function or another browser event might be associated with a given message. When the browser process has finished with a message, it proceeds to the next message in the queue.
The actual logic is contained in event-handler routines. These routines handle the events to which the main program will respond. For example, a single left-button mouse-click on a command button in a GUI program may trigger a routine that will open another window, save data to a database or exit the application.
GUI components support the lists of callbacks, called Listeners, which are typically populated when the components are created. EDT executes the listeners when user excitates the components somehow (button is clicked, mouse is moved, item is selected, focus is lost, component resized and so on.)
JavaScript (via package @arrows/multimethod) Perl (via the module Class::Multimethods) Python (via PEAK-Rules, RuleDispatch, gnosis.magic.multimethods, PyMultimethods, multipledispatch, or plum-dispatch) Racket (via multimethod-lib) Ruby (via the library The Multiple Dispatch Library and Multimethod Package and Vlx-Multimethods Package)
In software engineering, double dispatch is a special form of multiple dispatch, and a mechanism that dispatches a function call to different concrete functions depending on the runtime types of two objects involved in the call.
In computer science, dynamic dispatch is the process of selecting which implementation of a polymorphic operation (method or function) to call at run time.It is commonly employed in, and considered a prime characteristic of, object-oriented programming (OOP) languages and systems.