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    <p>The problem is that your value is an integer, but when bound to the <code>checkbox</code> element, it becomes a string. When the <code>checked</code> binding tries to find the value in the array, it doesn't find a match because it uses strict equality for comparison and <code>(2 === "2")</code> is false.</p> <p>The simplest way to work around this problem is to convert your values to string when you add them to the array:</p> <pre><code>self.selectedShifts.push("" + shift.ID); </code></pre> <p>Of course this means that your model has to change, and that might not be a great solution. I came up with a custom binding, <code>checkedInArray</code> that replaces <code>checked</code> and supports any type of value. You can <a href="https://stackoverflow.com/a/14863924/1287183">learn about it</a>, <a href="http://jsfiddle.net/mbest/L3LeD/" rel="nofollow noreferrer">see it in action</a>, and use it like this: </p> <pre><code>&lt;input type="checkbox" data-bind="checkedInArray: {value: ID, array: $root.selectedShifts }" /&gt; </code></pre> <p>In Knockout 2.3.0 (which is still in development) there will be a new binding, <a href="https://github.com/SteveSanderson/knockout/pull/875" rel="nofollow noreferrer"><code>checkedValue</code></a>, that will allow you use any type of value with the <code>checked</code> binding. Using that version, you could update your HTML to use <code>checkedValue</code>:</p> <pre><code>&lt;input type="checkbox" data-bind="checkedValue: ID, checked: $root.selectedShifts"/&gt; </code></pre>
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    1. COHej Michael and thanks for your response. I tried the first approach and you were right in your thoughts. Converting the integer to a string made the comparison possible against the selectedShifts observableArray. I will look into your custom binding and might write in this post again if I run in to trouble. Thanks for your assistance and good weekend / Easter.
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