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Mouse events. [3] [4] Keyboard events. HTML frame/object events. HTML form events. User interface events. Mutation events (notification of any changes to the structure of a document). Progress events [5] (used by XMLHttpRequest and File API [6]). Note that the event classification above is not exactly the same as W3C's classification.
JavaScript event listeners help developers run code when specific events happen. The onmouseover event listener runs code when a user's mouse pointer enters an element. The onmouseout event listener runs code when the mouse pointer leaves that element. These events can be added to HTML elements to make very interactive web pages.
The DOM also provides access to user actions such as pressing a key and clicking the mouse. It is possible to intercept and process these and other events by creating event handler functions and routines. The event handler receives control each time a given event occurs and can carry out any appropriate action, including using the DOM to change ...
The user can be the source of an event. The user may interact with the software through the computer's peripherals—for example, by typing on a keyboard or clicking with a mouse. Another source is a hardware device such as a timer. Software can also trigger its own set of events into the event loop, such as by communicating the completion of a ...
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.
A snippet of JavaScript code with keywords highlighted in different colors The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output .
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Mouse tracking (also known as cursor tracking) is the use of software to collect users' mouse cursor positions on the computer. [1] This goal is to automatically gather richer information about what people are doing, typically to improve the design of an interface.