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What exactly $event in angularjs does? Suppose I pass it in a function from the template, what all properties can I use in the controller? I have used it in a few cases but have not understood what exactly it does.

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The term $event is used to access the value the directive passed to the method. Access the target property of the event object, for details of an event.

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From the Docs:

$event

Directives like ngClick and ngFocus expose a $event object within the scope of that expression. The object is an instance of a jQuery Event Object when jQuery is present or a similar jqLite object.

— AngularJS Developer Guide - $event

Common Event Properties

jQuery normalizes the following properties for cross-browser consistency:

  • target
  • relatedTarget
  • pageX
  • pageY
  • which
  • metaKey

The following properties are also copied to the event object, though some of their values may be undefined depending on the event:

altKey, bubbles, button, buttons, cancelable, char, charCode, clientX, clientY, ctrlKey, currentTarget, data, detail, eventPhase, key, keyCode, metaKey, offsetX, offsetY, originalTarget, pageX, pageY, relatedTarget, screenX, screenY, shiftKey, target, toElement, view, which

For more information, see jQuery API Reference - Event Object

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