observeOnScope(scope, watchExpression, [objectEquality])

# Ⓢ

Creates a factory which allows the user to observe a property on a given scope to check for old and new values.

参数

1. scope (Scope): The scope to apply the watch function.
2. watchExpression: Expression that is evaluated on each $digest cycle. A change in the return value triggers a call to the listener.
   • string: Evaluated as expression
   • function(scope): called with current scope as a parameter.
3. [objectEquality]: (Function): Compare object for equality rather than for reference.

返回值

(Rx): The root of RxJS

例

angular.module('observeOnScopeApp', ['rx'])
    .controller('AppCtrl', function($scope, observeOnScope) {

        observeOnScope($scope, 'name').subscribe(function(change) {
            $scope.observedChange = change;
            $scope.newValue = change.newValue;
            $scope.oldValue = change.oldValue;
        });
    });