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PORefreshing list after ajax call with Knockout JS
 

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    <p>I have a list of attachments on a page which is generated using a jQuery <code>$.ajax</code> call and Knockout JS.</p> <p>My HTML looks like (this is stripped back):</p> <pre class="lang-html prettyprint-override"><code>&lt;tbody data-bind="foreach: attachments"&gt; &lt;tr&gt; &lt;td data-bind="text: Filename" /&gt; &lt;/tr&gt; &lt;/tbody&gt; </code></pre> <p>I have a function that gets the list of attachments which is returned as a JSON response:</p> <pre class="lang-js prettyprint-override"><code>$(function () { getFormAttachments(); }); function getAttachments() { var request = $.ajax({ type: "GET", datatype: "json", url: "/Attachment/GetAttachments" }); request.done(function (response) { ko.applyBindings(new vm(response)); }); } </code></pre> <p>My view model looks like:</p> <pre class="lang-js prettyprint-override"><code>function vm(response) { this.attachments = ko.observableArray(response); }; </code></pre> <p>There is a refresh button that the use can click to refresh this list because over time attachments may have been added/removed:</p> <pre class="lang-js prettyprint-override"><code>$(function () { $("#refresh").on("click", getAttachments); }); </code></pre> <p>The initial rendering of the list of attachments is fine, however when I call <code>getAttachments</code> again via the refresh button click the list is added to (in fact each item is duplicated several times).</p> <p>I've created a jsFiddle to demonstrate this problem here:</p> <blockquote> <p><a href="http://jsfiddle.net/CpdbJ/137" rel="nofollow">http://jsfiddle.net/CpdbJ/137</a></p> </blockquote> <p>What am I doing wrong?</p>
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    1. COKev - nice post. I'm still a little confused by it. New to knockout. I am having similar trouble simply loading a ViewModel with AJAX data on page load. I'm sure i'm missing a tiny but serious point. one thing that confuses me is some tutorials show `viewmodel` as an object (ex. `var viewmodel = { something: ko.observable() }`) and others as a function (ex. `function ViewModel() { this.something = ko.observable() }`) - any suggestions?
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    2. CO@one.beat.consumer - see my follow-up question: http://stackoverflow.com/questions/9589419/difference-between-knockout-view-models-declared-as-object-literals-vs-functions - the answer and the comments below should make things clearer. I'd recommend spending $25 and watching this: http://www.pluralsight-training.net/microsoft/Courses/TableOfContents?courseName=knockout-mvvm
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    3. COI'll check out your other question; thank you. I have a pluralsight subscription and I have watched it 2-3 times... they barely scratch the surface and much of it is old now that 2.0 is out, they were using 1.2 or 1.3 beta...
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