ngOn directive adds an event listener to a DOM element via angular.element().on(), and evaluates an expression when the event is fired.
ngOn allows adding listeners for arbitrary events by including the event name in the attribute, e.g.
ng-on-drop="onDrop()" executes the 'onDrop()' expression when the
drop event is fired.
AngularJS provides specific directives for many events, such as
ngClick, so in most cases it is not necessary to use
ngOn. However, AngularJS does not support all events (e.g. the
drop event in the example above), and new events might be introduced in later DOM standards.
Since HTML attributes are case-insensitive, camelCase properties like
myEvent must be escaped. AngularJS uses the underscore (_) in front of a character to indicate that it is uppercase, so
myEvent must be written as
<ANY ng-on-eventname="expression"> </ANY>
or with uppercase letters in property (e.g. "eventName"):
<ANY ng-on-event_name="expression"> </ANY>
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