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POHow to manually trigger a bindingHandler?
 

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  1. POHow to manually trigger a bindingHandler?
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    <p>I have the following bindinghandler in my DOM: </p> <pre><code>&lt;textarea data-bind="value: responseText, pagedown: liveEditors['editor'], valueUpdate: 'afterkeydown'"&gt;&lt;/textarea&gt; </code></pre> <p>Binding handler js: </p> <pre><code>ko.bindingHandlers.pagedown = { init: function (element, valueAccessor, allBindingsAccessor, viewModel) { // when formatting is not enabled, this will be null if (valueAccessor() != null) { valueAccessor().hooks.chain("onPreviewRefresh", function () { $(element).change(); }); } } }; </code></pre> <p>This binding handler is for pagedown formatting. A moment ago, the formatting was displayed by default, so the <code>valueAccessor()</code> was always hit, as the <code>liveEditors['editor']</code> array item was non-null. </p> <p>But now, I'm trying to stop this bindinghandler from running until a condition is met - when the user triggers "showFormatting", I'd like this bindingHandler to re-evaluate, as the array will have been populated. </p> <p>Currently, the bindingHandler is hit one time on load, <code>valueAccessor()</code> is null (as expected - formatting is not enabled), but then it never gets hit again.</p> <p>How can I manually trigger the handler from a function, or pass it an observable to watch before re-evaluating?</p> <p>Update: Changed textarea: </p> <pre><code> &lt;textarea data-bind="value: responseText, pagedown: { editor: liveEditors['editor'], showFormatting: showResponseFormatting }, valueUpdate: 'afterkeydown'"&gt;&lt;/textarea&gt; &lt;a class="response-button-container" data-bind="click: showFormatting"&gt;show editor&lt;/a&gt; </code></pre> <p>JS:</p> <pre><code>self.showFormatting = function() { self.showResponseFormatting(true); buildEditor(); runEditor(); }; self.showResponseFormatting = ko.observable(false); </code></pre> <p>Binding Handler: </p> <pre><code>ko.bindingHandlers.pagedown = { init: function (element, valueAccessor, allBindingsAccessor, viewModel) { var options = valueAccessor(); var showFormatting = ko.unwrap(options.showFormatting); var editor = options.editor; // when formatting is not enabled, this will be null if (showFormatting &amp;&amp; editor != null) { editor.hooks.chain("onPreviewRefresh", function () { $(element).change(); }); } } }; </code></pre>
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