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POKnockoutJS - Using custom bindings to add animation
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  1. POKnockoutJS - Using custom bindings to add animation
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    copied!<p>I'd like to make use of custom bindings to display a progress icon (spinner or bar) whilst a price is being updated via an ajax call.</p> <p>Before I started using Knockout I just called onUpdating() at the start of my ajax method and then onUpdated(price) when the ajax successfully returned a price.</p> <pre><code>function onUpdating() { $(".price").empty().html('&lt;img src="/Content/Img/Site/progress.gif" /&gt;'); } function onUpdated(price) { $(".price").empty().html('£' + price); } </code></pre> <p>As I'm now using Knockout I'd like to use the custom bindings but I just cant get my head around how it works.</p> <p>I guess something like this:</p> <pre><code> ko.bindingHandlers.showProgress = { init: function (element, valueAccessor) { $(element).empty().html('&lt;img src="/Content/Img/Site/progress.gif" /&gt;'); }, update: function (element, valueAccessor) { $(element).empty().html('£' + valueAccessor()); } } &lt;p&gt; Price: &lt;span data-bind="showProgress: price"&gt;&lt;/span&gt; &lt;/p&gt; </code></pre> <p>However, this doesn't work at all. Any help greatly appreciated.</p> <p><strong>EDIT</strong> The following seems to be getting there but its not showing the progress bar whilst updating:</p> <pre><code> ko.bindingHandlers.showProgress = { update: function (element, valueAccessor) { $(element).empty().html('&lt;img src="/Content/Img/Site/progress.gif" /&gt;'); var value = ko.utils.unwrapObservable(valueAccessor()); $(element).empty().html('£' + value); } } </code></pre>
 

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