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    <p><strike>You can most likely extend your observable, depending on what exactly you are trying to achieve. This should give you a good direction (I haven't dropped it into a fiddle to test it yet) - </p> <pre><code>ko.extenders.overage = function(target, max) { target.overage = ko.observable(); var result = ko.computed({ read: target, write: function(newValue) { var current = target(), valueToWrite = newValue &gt; max ? max : newValue if (valueToWrite === max) { target.overage(current - max); target(valueToWrite); } else { target.notifySubscribers(valueToWrite); } } }); result(target()); return result; }; function AppViewModel(one) { this.myNumberOne = ko.observable(one).extend({ overage: 500 }); } ko.applyBindings(new AppViewModel(221.2234)); </code></pre> <p>Now your observable <code>myNumberOne</code> has an extended property called <code>overage</code> for any additional amount over the <code>max</code> that is set when you extend it (in this case, 500) and the vlaue of myNumberOne or any other observable that you extend will cap out at 500 and pass the additional as overage.</p> <p>In your view you could use this something like this - </p> <pre><code>&lt;span data-bind="text: myNumberOne"&gt;&lt;/span&gt; &lt;!-- ko if: myNumberOne().overage --&gt; Overage amount - &lt;span data-bind="text: myNumberOne().overage"&gt;&lt;/span&gt; &lt;!-- /ko --&gt; </code></pre> <p>or </p> <pre><code>&lt;span data-bind="text: myNumberOne"&gt;&lt;/span&gt; &lt;div data-bind="text: $data.myNumberOne().overage"&gt;&lt;/div&gt; </code></pre> <p></strike></p> <p><a href="http://jsfiddle.net/DNxHu/" rel="nofollow">http://jsfiddle.net/DNxHu/</a></p> <p>Extend it and subscribe to it, don't use a computed, etc... Check the fiddle</p>
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    1. POHow to cap ko.observable and drop remainder into another field
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    1. COTrying to get this working in JSFiddle... there is an init for a ko.computed?
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    2. COGood question. Let me double check that : ) If not just hit it on the initializer and subscribe to before changes, let me edit the answer
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    3. COUpdated, sorry about that, I will try to throw it into a fiddle to make sure it acts as expected
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