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POknockback - backbone model reset, knockout if render
 

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    <p>I am using backbone for persistence and knockout for binding, i.e. I am using knockback On page load, all is well. When I click on the check box, based on the value of IsChecked, either yes or no is displayed.</p> <p>When I click on reset model button, the previously seen behavior is lost. That is, if 'yes' is being displayed and I click on reset, then 'no' will never be displayed no matter the check box state.</p> <p>If I use visible binding it will work but I need to get this 'if' to work so that I can decide whether to render some form elements depending on user criteria.</p> <p>Any help is appreciated. Thanks.</p> <p>Here is my sample code:</p> <pre><code>&lt;script type="text/javascript"&gt; var model_a; var collection_ac; var example_new_model_a; $(document).ready(function () { model_a = Backbone.Model.extend({ idAttribute: 'A_Pid', defaults: { A_Pid: null, ChildName: "", IsChecked: false, Show: false, }, }); example_new_model_a = new model_a(); example_new_model_a.set('ChildName', 'child of test'); vm = kb.viewModel(example_new_model_a); ko.applyBindings(vm, $('#div1')[0]); }); var vm; function reset_model() { kb.utils.release(vm); vm = null; example_new_model_a = new model_a(); example_new_model_a.set('ChildName', 'child of test2'); vm = kb.viewModel(example_new_model_a); ko.applyBindings(vm, $('#div1')[0]); } function show_div() { example_new_model_a.set('Show', true); } </code></pre> <p></p> <pre><code>&lt;div id="div1"&gt; &lt;div data-bind="visible: Show"&gt; Check or Uncheck &lt;input type="checkbox" data-bind="checked: IsChecked" /&gt; &lt;!-- ko if:IsChecked --&gt; &lt;p&gt;yes&lt;/p&gt; &lt;!-- /ko --&gt; &lt;!-- ko if:!IsChecked() --&gt; &lt;p&gt;no&lt;/p&gt; &lt;!-- /ko --&gt; &lt;button data-bind="click: reset_model"&gt;Reset&lt;/button&gt; &lt;/div&gt; &lt;button data-bind="click: show_div"&gt;Show&lt;/button&gt; </code></pre> <p></p> <p><strong>Edit</strong></p> <p>I found that if I add the following code, even after pressing reset, it works. After reading <a href="https://stackoverflow.com/questions/8537397/knockout-js-how-to-force-view-refresh-instead-of-using-ko-observable">How to force a view refresh without having it trigger automatically from an observable?</a> and <a href="https://stackoverflow.com/questions/7516636/knockout-js-templates-foreach-force-complete-re-render">Knockout.js Templates Foreach - force complete re-render</a>, I tried the template with if and it works. Not sure how to call value has mutated from knockback view model so unless there is a better way, I will use this workaround.</p> <pre><code>&lt;div data-bind="template: { name: 'test-template-1', if:IsChecked}"&gt;&lt;/div&gt; &lt;script type="text/html" id="test-template-1"&gt; &lt;p&gt;yes2&lt;/p&gt; &lt;/script&gt; &lt;div data-bind="template: { name: 'test-template-2', if:!IsChecked()}"&gt;&lt;/div&gt; &lt;script type="text/html" id="test-template-2"&gt; &lt;p&gt;no2&lt;/p&gt; &lt;/script&gt; </code></pre>
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