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    <p>It is a known problem with scoping in directives. You can read the article <a href="https://github.com/angular/angular.js/wiki/The-Nuances-of-Scope-Prototypal-Inheritance" rel="nofollow noreferrer">The Nuances of Scope Prototypal Inheritance</a> to know more about the <code>scoping</code> in angular js.</p> <p>Any primitive value assignment from a child/transcluded scope will create a new instance value instead of changing the parent scopes value</p> <p>In your case you are working with a primitive value <code>selectedNumber</code>.</p> <p>There are two suggested ways to fix it</p> <p>Solution 1 <br /> <em>Use a object instead of primitive value.</em><br /></p> <ol> <li>Change selectedNumber to an object <code>scope.selectedNumber = { num : 1 };</code></li> <li>Change display to <code>&lt;h2&gt;{{ selectedNumber.num }}&lt;/h2&gt;</code></li> <li>Change the click handler in <code>ng-repeat</code> to <code>ng-click="selectedNumber.num = number"</code></li> </ol> <p>Demo: <a href="http://plnkr.co/edit/TxPD9lKFI9T4S5uZ4i07?p=preview" rel="nofollow noreferrer">Plunker</a><br /></p> <p>Solution 2:<br /> <em>Use <code>$parent</code> scope reference<br /></em></p> <ol> <li>Change the click handler in <code>ng-repeat</code> to <code>ng-click="$parent.selectedNumber = number"</code></li> </ol> <p>Demo: <a href="http://plnkr.co/edit/e6ncIbHiKRz6rX94XlXh?p=preview" rel="nofollow noreferrer">Plunker</a></p> <p>Solution 3:<br /> <em>Use a setter in the parent scope<br /></em></p> <ol> <li>Create a setter method in the parent scope like <code>$scope.setSelectedNumber = function(num){ $scope.selectedNumber = num}</code></li> <li>Change the click event to <code>setSelectedNumber(number)</code> (This is the method already used)</li> </ol> <p><em>Update: <br /></em> As suggested by Anders Ekdahl, it is advisable to use the object (solution 1) based solution.</p>
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    1. POWhy does assignment not always work in Angular expressions?
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    1. USArun P Johny
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    1. POWhy does assignment not always work in Angular expressions?
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    1. COYou should be using an object as the model instead of accessing the parent scope by $parent. Accessing $parent leads to brittle code, since it will stop working if you were to add another scope in between.
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      1. USAnders Ekdahl
    2. CO@AndersEkdahl you are right, I just gave the available options as the answer, the pointer article explains the use cases and the problems
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      1. USArun P Johny
    3. COAwesome! Thanks for the quick answer! That makes complete sense. FYI, the real use-case for this is dynamically selecting the page background in a page editor based on an array of preview "swatches". The value being set is called 'selectedClass', but it is a string, so I guess it's still a primitive type and the same issue applies. Though it's awesome to see your solutions, do you think a setter in the controller would be a better design?
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