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PODynamic composition using knockout and durandal doesn't work
 

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  1. PODynamic composition using knockout and durandal doesn't work
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    <p>I have a strange problem while using Durandal/Knockout. In some cases the binding doesn't work properly. I've simplified my situation which came in this question.</p> <p>I'm setting composition info somewhere in my code like:</p> <pre><code>compositionInfo({ model: viewModelInstance, view: viewName, activate: viewModelInstance.activate }); </code></pre> <p>And this is my view:</p> <pre><code>&lt;div id="service-container" data-bind="compose: { model: compositionInfo().model, view: compositionInfo().view, activate: compositionInfo().activate}"&gt; </code></pre> <p>At the first time, the composition works fine. But on the next time when the <code>compositionInfo</code> changes (using the same lines and in the same place of the code), nothing happens. </p> <p>The first time there is a <code>["Activating",...]</code> in the log window. But in the second time there's no such log or <code>["Binding"]</code> log.</p> <p>I've traced the Durandal and Knockout code and find out that in the <code>knockout-2.3.0.debug</code> file there's a <code>evaluateImmediate()</code> function which runs this line on first time (correct ones):</p> <pre><code>var newValue = readFunction.call(evaluatorFunctionTarget); </code></pre> <p>and causes the composition to start to activating the model.</p> <p>But when it's not working in the <code>evaulateImmediate()</code> it returns some lines above by this code:</p> <pre><code>// Don't dispose on first evaluation, because the "disposeWhen" callback might // e.g., dispose when the associated DOM element isn't in the doc, and it's not // going to be in the doc until *after* the first evaluation if (_hasBeenEvaluated &amp;&amp; disposeWhen()) { dispose(); return; } </code></pre> <p>What is this code for? <strong>Everything works fine if I comment these lines</strong>.</p> <p>This problem varies computer to computer. On my computer in most cases it just work the first time. but on other computer it works most of the time and fails about 3/10 cases.</p> <p>FYI I'm using Durandal 1.1.1 and Knockout 2.3.0</p>
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    1. USmehrandvd
    1. USmehrandvd
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      1. VTUpMod
    1. COI'd suggest upgrading to Durandal 2.0.1 as there were many enhancements made to the compose bindings. 2.0 has some breaking changes, so it will require some extra work http://durandaljs.com/documentation/Conversion-Guide/
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      1. PODynamic composition using knockout and durandal doesn't work
      1. USRainerAtSpirit
    2. CO@RainerAtSpirit currently due to my project time constraints. It's not possible to upgrade in mean time. BTW, it seems the problem is not about Durandal. The code lied in the knockout.
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      1. USmehrandvd
    3. COSounds to me like your bindings are breaking somewhere else. I use this same composition method all the time
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      1. USPW Kad
 

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