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    <p>One way to share variables across multiple controllers is to <a href="https://code.angularjs.org/1.2.21/docs/guide/services" rel="noreferrer">create a service</a> and inject it in any controller where you want to use it.</p> <p><strong>Simple service example:</strong></p> <pre><code>angular.module('myApp', []) .service('sharedProperties', function () { var property = 'First'; return { getProperty: function () { return property; }, setProperty: function(value) { property = value; } }; }); </code></pre> <p><strong>Using the service in a controller:</strong></p> <pre><code>function Ctrl2($scope, sharedProperties) { $scope.prop2 = "Second"; $scope.both = sharedProperties.getProperty() + $scope.prop2; } </code></pre> <p>This is described very nicely in <a href="http://onehungrymind.com/angularjs-sticky-notes-pt-1-architecture/" rel="noreferrer">this blog</a> (Lesson 2 and on in particular).</p> <p>I've found that if you want to bind to these properties across multiple controllers it works better if you bind to an object's property instead of a primitive type (boolean, string, number) to retain the bound reference. </p> <p>Example: <code>var property = { Property1: 'First' };</code> instead of <code>var property = 'First';</code>.</p> <hr> <p><strong>UPDATE:</strong> To (hopefully) make things more clear <a href="http://jsfiddle.net/b2fCE/1/" rel="noreferrer">here is a fiddle</a> that shows an example of:</p> <ul> <li><strong>Binding to static copies of the shared value (in myController1)</strong> <ul> <li>Binding to a primitive (string)</li> <li>Binding to an object's property (saved to a scope variable)</li> </ul></li> <li><strong>Binding to shared values that update the UI as the values are updated (in myController2)</strong> <ul> <li>Binding to a function that returns a primitive (string)</li> <li>Binding to the object's property</li> <li>Two way binding to an object's property</li> </ul></li> </ul>
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    1. POAngularJS: How can I pass variables between controllers?
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    1. COIn this case - how would the scope of Ctrl2 "know" when sharedProperties.getProperty() changes value?
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    2. COIf you wanted your UI to update each time the property changes you can change `both` to be a function and it will be called/re-evaluated during the angular digest process. See [this fiddle](http://jsfiddle.net/x8vfR/) for an example. Also if you bind to an object's property you can use it directly in your view and it will update as the data is changed similar to [this example](http://jsfiddle.net/tg78g/2/).
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    3. COIf you want to detect and react to changes in your controller an option is to add the `getProperty()` function to the scope and use [$scope.$watch](http://docs.angularjs.org/api/ng.$rootScope.Scope#$watch) like in [this example](http://jsfiddle.net/tg78g/1/). Hope these examples help!
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