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POHow to use a knockoutjs protected observable with checkboxes?
 

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  1. POHow to use a knockoutjs protected observable with checkboxes?
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    <p>I'm using knockoutjs with protected observable and am having an issue with checkboxes. One implementation of protected observables can be found <a href="http://www.knockmeout.net/2011/03/guard-your-model-accept-or-cancel-edits.html" rel="noreferrer">here</a> but there are several that I've seen that are very similar.</p> <p>A jsFiddle that demonstrates my issue can be found <a href="http://jsfiddle.net/rhoadsce/r9pKr/1/" rel="noreferrer">here</a>. Here is a portion of the fiddle.</p> <pre><code>var ViewModel = function() { var self = this; self.protectedBool = ko.protectedObservable(true); self.commit = function(){ ko.commitProtectedObservables(self); }; self.rollback = function() { ko.rollbackProtectedObservables(self); }; }; $(function() { ko.applyBindings(new ViewModel()); }); </code></pre> <p>To duplicate, do the following:</p> <ol> <li>Run the fiddle (default value for the checkbox is true)</li> <li>Uncheck the checkbox</li> <li>Click "Commit"</li> <li>Note that the value now shows as false (this is the correct behavior)</li> <li>Run the fiddle again (default value for the checkbox is true)</li> <li>Uncheck the checkbox then check it immediately (before clicking "Commit")</li> <li>Click "Commit"</li> <li>You'll see the value will be set to false/unchecked even though it was checked when you clicked "Commit".</li> </ol> <p>The "write" event in the computed observable inside the protectedObservable definition does <em>not</em> get fired the second time you change the checkbox and thus when the value is commited, it's committing the incorrect value.</p> <p>Also note that the protectedObservable works perfectly for strings. Any guidance would be greatly appreciated.</p>
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    1. COI don't have a proper answer yet. So I just post this very hacky workaround as a comment: http://jsfiddle.net/CyHyW/
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    2. COExcellent! Thanks for the response!
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    3. CO`protectedObservable`'s implementation is very old. I guess it works with older version of KO (< 2) only. For new KO refer the editor pattern implemented by the same author (Ryan Niemeyer) - http://www.knockmeout.net/2013/01/simple-editor-pattern-knockout-js.html
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      1. USAndrejs Kuzmins
 

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