CODEWITHSUNDEEP
javascriptjqueryc++angularjsnode-webkit
George Netu
George Netu

Reputation: 2832

Check if an object property changes its value

I have two applications (one in C++, the other one in node-webkit) that communicate via OSC. When I press + a value will increment and when I press - that value will decrement. The output is sent to the node-webkit instance and then handles the message using:

$scope.$on('FooBar', function (event, obj) {
//stuff happens here
};

In this case, obj has one property, foobar, a positive integer, that goes up and down everytime I press the keys. Thing is I need to change the corresponding local value of FooBar. I tried using:

 var aux = obj.foobar;
 if (aux < obj.foobar) {
       FooBarManager.raiseFooBar();
 } else {
       if (aux > obj.foobar) {
           FooBarManager.lowerFooBar();
   }
 }

but I can't get the logic working. Nothing happens since aux will always be equal to the property of obj when a key is pressed and the value is changed.

Upvotes: 0

Views: 90

Answers (1)

x4rf41
x4rf41

Reputation: 5337

Does this work then?

var previousFooBar = 0; // whatever your default is
$scope.$on('FooBar', function (event, obj) {
 if (obj.foobar > previousFooBar) {
      FooBarManager.raiseFooBar();
 } else if (obj.foobar < previousFooBar) {
      FooBarManager.lowerFooBar();
 }
 previousFooBar = obj.foobar;
});

Upvotes: 1

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