Created
February 24, 2017 19:17
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Angular v1 Pub-Sub
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// an example channel service that lets consumers | |
// subscribe and publish for nuclear reactor meltdowns | |
var CoreReactorChannel = function($rootScope) { | |
// local constants for the message ids. | |
// these are private implementation detail | |
var ELEVATED_CORE_TEMPERATURE_MESSAGE = "elevatedCoreMessage"; | |
// publish elevatedCoreTemperature | |
// note that the parameters are particular to the problem domain | |
var elevatedCoreTemperature = function(core_id, temperature) { | |
$rootScope.$broadcast(ELEVATED_CORE_TEMPERATURE_MESSAGE, | |
{ | |
core_id: core_id, | |
temperature: temperature | |
}); | |
}; | |
// subscribe to elevatedCoreTemperature event. | |
// note that you should require $scope first | |
// so that when the subscriber is destroyed you | |
// don't create a closure over it, and te scope can clean up. | |
var onElevatedCoreTemperature = function($scope, handler) { | |
$scope.$on(ELEVATED_CORE_TEMPERATURE_MESSAGE, function(event, message){ | |
// note that the handler is passed the problem domain parameters | |
handler(message.core_id, message.temperature); | |
}); | |
}; | |
// other CoreReactorChannel events would go here. | |
return { | |
elevatedCoreTemperature: elevatedCoreTemperature, | |
onElevatedCoreTemperature: onElevatedCoreTemperature | |
}; | |
}; | |
//Usage elsewhere in the application | |
var MyController = function($scope, CoreReactorChannel){ | |
// Handle core temperature changes | |
var onCoreTemperatureChange = function(core_id, temperature){ | |
console.log(core_id, temperature); | |
} | |
// Let the CoreReactorChannel know the temperature has changed | |
$scope.changeTemperature = function(core_id, temperature){ | |
CoreReactorChannel.elevatedCoreTemperature(core_id, temperature); | |
} | |
// Listen for temperature changes and call a handler | |
// Note: The handler can be an inline function | |
CoreReactorChannel.onElevatedCoreTemperature($scope, onCoreTemperatureChange); | |
}; |
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