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POWhy is Angular.js calling my function so frequently with ng-change and how do I make it call only once per change?
 

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  1. POWhy is Angular.js calling my function so frequently with ng-change and how do I make it call only once per change?
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    <p>I'm building my first proper angular.js app after going through many tutorials. I've hit a problem with the <code>ngChange</code> directive. I'm trying to use it to call a function each time the value of a drop down list is changed by the user. I find that it calls the function multiple times upon page load and also multiple times each time the option is selected.</p> <p>I've put together <a href="http://jsfiddle.net/jeshuamaxey/2mXJY/" rel="nofollow">this jsfiddle</a> which demonstrates the problem I'm having.</p> <p>I'd like to know why it's exhibiting this behaviour and how I can achieve my desired outcome of one function call per option change and no calling of <code>change()</code> on page load. (this second criterion is less critical for my app, but I would like to know how to suppress this behaviour nonetheless).</p> <p>I've reproduced the code below for those of you who may be able to find an immediate error.</p> <h3>HTML</h3> <pre><code>&lt;body ng-app ng-controller="Controller"&gt; &lt;div&gt; &lt;h2&gt;Number of changes: {{numOfChanges}}&lt;/h2&gt; &lt;select ng-change="{{change()}}" ng-model="currentSelection"&gt; &lt;option ng-repeat="option in options"&gt;{{option}}&lt;/option&gt; &lt;/select&gt; &lt;/div&gt; &lt;/body&gt; </code></pre> <h3>JavaScript</h3> <pre><code>Controller = function($scope) { $scope.numOfChanges = 0; $scope.change = function() { $scope.numOfChanges++; } $scope.options = ["do", "ray", "me", "far", "so", "la", "tee","dah"] } </code></pre> <p>I'm aware this could well be due to my improper use/understanding of the angular methodology. I'd appreciate answers that address all the failings of this small example.</p>
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