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POKnockoutJS options binding, unable to set value in parent context
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  1. POKnockoutJS options binding, unable to set value in parent context
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    copied!<pre><code>&lt;select data-bind='foreach: theOptions'&gt; &lt;option data-bind='text: name, value: $root.watchThis().something'&gt;&lt;/option&gt; &lt;/select&gt; You have selected &lt;p data-bind="text: watchThis().something"&gt;&lt;/p&gt; Json model. &lt;p data-bind="text: ko.toJSON(watchThis)"&gt;&lt;/p&gt; </code></pre> <p>Options are being shown, but when i change value the relative observable is not updated. More code:</p> <pre><code>function FooModel() { this.something = ko.observable(); } function VM() { var self = this; self.watchThis = ko.observable(new FooModel()); self.theOptions = ko.observableArray(); self.theOptions([ {id:1, name: 'foo'}, {id:2, name: 'bar'}, {id:3, name: 'baz'} ]); } ko.applyBindings(new VM()); </code></pre> <p>I also tried </p> <pre><code>&lt;option data-bind='text: name, value: $root.watchThis().something'&gt;&lt;/option&gt; &lt;option data-bind='text: name, value: $root.watchThis.something'&gt;&lt;/option&gt; &lt;option data-bind='text: name, value: $parent.watchThis().something'&gt;&lt;/option&gt; </code></pre> <p>What seems worst, if i explicitly initialize the value like this</p> <pre><code>function FooModel() { this.something = ko.observable(2); } </code></pre> <p>everything looks fine, but when i switch options the observable is not updated.</p> <p><a href="http://jsfiddle.net/6gvdP/2" rel="nofollow">JSFiddle here</a></p> <p>Question is: how to update an observable from an external context using the option selected value?</p>
 

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