change scope.knob to var knob. #16
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scope.knob = scope.$eval(attrs.knobData); to var knob = scope.$eval(attrs.knobData); If you name the data variable $scope.knob in the main scope than the directive will overwrite it and $watch will not function. An internal variable is better
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scope.knob = scope.$eval(attrs.knobData);
to
var knob = scope.$eval(attrs.knobData);
If you name the data variable $scope.knob in the main scope than the directive will overwrite it and $watch will not function.
An internal variable is better