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Event logs can also be remotely viewed from other computers or multiple event logs can be centrally logged and monitored without an agent and managed from a single computer. Events can also be directly associated with tasks, which run in the redesigned Task Scheduler and trigger automated actions when particular events take place.
For example, web application authors, wishing to intercept a user's intent to undo the last action, need to "listen" for all the following events: Control+Z on Windows and Linux. Command+Z on Mac OS X. Shake events on some mobile devices. It would be simpler to listen for a single, normalized request to "undo" the previous action.
This is an accepted version of this page This is the latest accepted revision, reviewed on 9 February 2025. High-level programming language Not to be confused with Java (programming language), Javanese script, or ECMAScript. JavaScript Screenshot of JavaScript source code Paradigm Multi-paradigm: event-driven, functional, imperative, procedural, object-oriented Designed by Brendan Eich of ...
For example, to highlight the text in a heading when the user moves the mouse pointer over it, you can use the style object to enlarge the font and change its color, as shown in the following simple example.
var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...
Mozilla Developer Network's JavaScript site; W3schools Javascript tutorial; JavaScript syntax; jQuery; Also, it would definitely help if you tried using one of our scripts and got it working. The rest of this tutorial assumes you know where the various things are (all explained at Wikipedia:User scripts § How do you install user scripts?).
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.
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). It is one way ...