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    <p>If you want the visibility of those divs to change dynamically (which it seems that you might), you will want to to make isVisible a <a href="http://knockoutjs.com/documentation/computedObservables.html" rel="nofollow noreferrer">computedObservable</a>. That will make sure that the isVisible logic gets re-run when observables (that it depends on) change.</p> <p>it could return a string which you could bind you visibility to (data-bind="visible: isVisible() === 'Area'"), or you could create a different computed for each div if they are unrelated. (isAreaVisilbe, isBedroomVisible, ...) Your viewModel essentially turns into something like this:</p> <pre><code>function ViewModel() { var self = this; self.propertyTypeList = ko.observableArray(['Area', 'Bedroom', 'Other']); self.selectedPropertyType = ko.observable(""); self.visibleFeatures = ko.observableArray([]); self.visibleDiv = ko.computed(function () { //Your logic here return self.selectedPropertyType(); }); </code></pre> <p>I made a basic working example of what I think you are trying to make here <a href="http://jsfiddle.net/ZqWDS/5/" rel="nofollow noreferrer">http://jsfiddle.net/ZqWDS/5/</a> Had to change your viewModel to be a function so that the isVisible property can reference other properties. (<a href="https://stackoverflow.com/questions/14034476/how-to-reference-properties-of-current-object-in-js">How to reference properties of current object in JS</a>). And you can read the section titled 'A popular convention that simplifies things' on the knockout computedObservables page for more details about why I structured the viewModel constructor that way.</p> <p>I'm not sure what's causing your error at the top of the question. I pasted your code into a jsFiddle and it essentially worked (with a few minor syntax edits) <a href="http://jsfiddle.net/GBkdK/" rel="nofollow noreferrer">http://jsfiddle.net/GBkdK/</a></p> <p>If you are still having issues and want to provide some more context, I'm happy to help.</p> <p><strong>EDIT</strong> Sorry, I think I was wrong about isVisible needing to be a computed. It appears that it could just be a function like you originally had it. <a href="http://jsfiddle.net/ZqWDS/6/" rel="nofollow noreferrer">http://jsfiddle.net/ZqWDS/6/</a></p> <p><a href="https://stackoverflow.com/questions/6706281/knockoutjs-can-we-create-a-dependentobservable-function-with-a-parameter?lq=1">knockoutjs: can we create a dependentObservable function with a parameter?</a></p>
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