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    copied!<p>Can you show your code, please? Because in my example this function wort correctly. This code in dataExample.js file: </p> <pre><code>(function () { "use strict"; var dataArray = [ { title: "Basic banana", text: "Low-fat frozen yogurt", picture: "images/60banana.png" }, { title: "Banana blast", text: "Ice cream", picture: "images/60banana.png" }, { title: "Marvelous mint", text: "Gelato", picture: "images/60mint.png" }, { title: "Succulent strawberry", text: "Sorbet", picture: "images/60strawberry.png" } ]; var dataList = new WinJS.Binding.List(dataArray); var publicMembers = { itemList: dataList }; WinJS.Namespace.define("DataExample", publicMembers); })(); </code></pre> <p><br> In default.js I create function, which display count of selected items</p> <pre><code>function someFunc(mouseEvent) { var count = document.getElementById("basicListView").winControl.selection.count(); var dlg = new Windows.UI.Popups.MessageDialog(count); dlg.showAsync().operatio; </code></pre> <p>}</p> <p><br> My default.html contains next code:</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;meta charset="utf-8" /&gt; &lt;title&gt;App1&lt;/title&gt; &lt;!-- WinJS references --&gt; &lt;link href="//Microsoft.WinJS.1.0/css/ui-white.css" rel="stylesheet" /&gt; &lt;script src="//Microsoft.WinJS.1.0/js/base.js"&gt;&lt;/script&gt; &lt;script src="//Microsoft.WinJS.1.0/js/ui.js"&gt;&lt;/script&gt; &lt;!-- App1 references --&gt; &lt;link href="/css/default.css" rel="stylesheet" /&gt; &lt;script src="/js/default.js"&gt;&lt;/script&gt; &lt;script src="/js/dataExample.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;button id="btn" class="ui-button" onclick="someFunc(event)"&gt;click me&lt;/button&gt; &lt;p id="button1Output"&gt;&lt;/p&gt; &lt;div id="basicListView" data-win-control="WinJS.UI.ListView" data-win-options="{ itemDataSource : DataExample.itemList.dataSource }"&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><br> I use <a href="http://msdn.microsoft.com/en-us/library/windows/apps/hh465496.aspx" rel="nofollow">this MSDN example</a></p>
 

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