Understand the $on in Angularjs, $broadcast, $emit

$emit effect is to broadcast an event from a child scope to the parent scope until the root scope. (Including yourself)

$emit has two parameters name and Args,name are the names that need to be broadcast, and args is one or more parameters.

$broadcast parameters are the same as $emit, one is the name and the other is the parameter.

The $broadcast is for an event to be broadcast from the parent to the child scope. (Including yourself)

The same thing is: $emit, $broadcast need to bind events. Like this:

function () {$broadcast (broadcastname, Broadcastargs);}

The parent scope or child scope is then monitored for this event.

$on has two parameters, name and listener.

Name refers to the name of the event being monitored. For example, the above Broadcastname,listener is a function, it also has two parameters: event and args

The event has several properties:

Targetscope: Scope of propagation events

CurrentScope: Current Scope

Name: Event names, as EventName above

Stoppropagation (): Causes the $emit event to propagate no longer after the current scope is propagated

Preventdefault (): Prevents propagation of events and assigns a value of true to defaultprevented

Defaultprevented: Returns True if the Preventdefault event is called.

Understand the $on in Angularjs, $broadcast, $emit