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    <h2>Update:</h2> <blockquote> <p>Try to click on elem3 : You will see the console.debug output 'Object {name: "elem3", children: Array[0]' And the console.warn outputs : Object {name: "elem2", children: Array[1] I though I would had "elem3" output twice. Instead I got "elem3" and "elem2". Do you know why this happens?</p> </blockquote> <p>To anwser this, first we take a look on generated HTML and scope:</p> <pre><code> &lt;!-- controller scope --&gt; &lt;li data-ng-repeat=" tr in trData "&gt; &lt;!--1|-child scope --&gt; &lt;span&gt;elem2 - &lt;/span&gt; &lt;!--2 |-isolated scope --&gt; &lt;ul&gt; &lt;!-- | --&gt; &lt;li data-ng-repeat="tr0 in tr.children"&gt;&lt;!--3 |-child scope --&gt; &lt;span&gt;elem3&lt;/span&gt; &lt;!--4 |-isolated scope --&gt; &lt;/li&gt; &lt;/ul&gt; &lt;/li&gt; </code></pre> <p>The variables in scope will be like: (<code>|-</code> stands for inheritance)</p> <ul> <li>Controller Scope: <code>{ trData: [...] }</code> <ul> <li>|- Scope1 (child): <code>{ tr0: elem2 }</code></li> </ul></li> <li>Scope2 (isolated): <code>{ tr: elem2, test: function() }</code> <ul> <li>|- Scope3 (child): <code>{ tr0: elem3 }</code></li> </ul></li> <li>Scope4 (isolated): <code>{ tr: elem3, test: function() }</code> </li> </ul> <p><br> Now, according to <a href="http://docs.angularjs.org/api/ng.%24compile" rel="nofollow">official api docs</a>, which talks about isolated scope variable:</p> <blockquote> <p>&amp; or &amp;attr - provides a way to execute an expression in the context of the parent scope.</p> </blockquote> <p>* This feature is implemented by <code>$parse</code> service.</p> <p>After you clicked on <code>elem3</code>, the execution order will be: (skip the log part.)</p> <ol> <li><code>test({ tr: scope.tr })</code> using <code>Scope4</code> as its execution context <ul> <li>Equals to <code>$parse('test(tr)')(Scope3, { tr: elem3 })</code>.</li> <li>It's called in <code>Scope3</code> because <code>$parse</code> executes in parent scope.</li> </ul></li> <li><code>test(tr)</code> using <code>Scope3</code> as its execution context <ul> <li>Equals to <code>$parse('testFunction(tr)')(Scope1, elem3)</code> </li> <li>It's called in <code>Scope1</code> because test() is inherited from <code>Scope2</code>, and <code>$parse</code> executes in parent scope.</li> </ul></li> <li><code>testFunction(tr)</code> using <code>Scope1</code> as its execution context <ul> <li>Now tr will be parsed into <code>Scope1.tr</code> which is <code>elem2</code> because <code>elem3.tr</code> doesn't exist.</li> </ul></li> <li>Finally, <code>console.warn(elem2)</code>;</li> </ol> <p>This is how that happens... </p> <p>* About $parse service you can check <a href="http://docs.angularjs.org/api/ng.%24parse" rel="nofollow">this</a>.</p> <hr> <h2>Origin:</h2> <p>I changed <code>console.log</code> to <code>console.warn</code>, ang log shows it only executed once.</p> <pre><code> $scope.testFunction = function (tr) { console.warn(tr); } </code></pre> <p><a href="http://jsfiddle.net/T4uKf/" rel="nofollow">http://jsfiddle.net/T4uKf/</a></p> <p>It prints twice</p> <pre><code>A {name : 'elem3',children : []} {name : 'elem2',children : [{name : 'elem3',children : []}] } B </code></pre> <p>only because you log it in both <code>scope.setActive</code> and <code>$scope.testFunction()</code></p>
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    1. COThanks very much for the Fiddle. I was going to create one, but got no time. Try to click on elem3 : You will see the console.debug output 'Object {name: "elem3", children: Array[0]' And the console.warn outputs : Object {name: "elem2", children: Array[1] I though I would had "elem3" output twice. Instead I got "elem3" and "elem2". Do you know why this happens?
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    2. CO@Cooluhuru I tried to explain, hope that helps.
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    3. COI got it the parent Scope, but I still don't understand why the {tr:value} parameter is rewritten with elem2. Do you have any example around where I could call the controller's function with the value of the clicked directive's tr?
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