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    <p>Indeed, the <code>&lt;f:ajax change&gt;</code> isn't supported on <code>&lt;h:inputHidden&gt;</code>. You'd only get the following exception because the <a href="http://docs.oracle.com/javaee/6/api/javax/faces/component/html/HtmlInputHidden.html" rel="nofollow"><code>HtmlInputHidden</code> class</a> behind the component doesn't implement <a href="http://docs.oracle.com/javaee/6/api/javax/faces/component/behavior/ClientBehaviorHolder.html" rel="nofollow"><code>ClientBehaviorHolder</code> interface</a>:</p> <blockquote> <p><code>javax.faces.view.facelets.TagException: /test.xhtml @23,52 &lt;f:ajax&gt; Unable to attach &lt;f:ajax&gt; to non-ClientBehaviorHolder parent</code></p> </blockquote> <p>You indeed need to replace it by a <code>&lt;h:inputText&gt;</code>. You can hide it using CSS <code>display:none;</code>. You only need to realize that manipulating its value by JavaScript won't automagically trigger any HTML DOM events. You'd need to manually trigger the <code>change</code> event by explicitly invoking <code>onchange()</code> on the HTML DOM element:</p> <pre><code>var input = document.getElementById(...); input.value = newValue; input.onchange(); </code></pre> <p>Or, if you happen to use jQuery on the whole,</p> <pre><code>var $input = $("#..."); $input.val(newValue); $input.change(); // Or $input.trigger("change"); </code></pre> <hr> <p><strong>Unrelated</strong> to the concrete problem, as to the question in the comment here:</p> <pre><code>&lt;cc:attribute name="id" /&gt;&lt;!-- necessary? --&gt; </code></pre> <p>Only for documentary purposes. I.e. when you actually use <code>shortDescription</code>. </p> <pre><code>&lt;cc:attribute name="id" shortDescription="The ID of the composite." /&gt; </code></pre> <p>But otherwise it's already inherited from the <a href="http://docs.oracle.com/javaee/6/api/javax/faces/component/UIComponent.html" rel="nofollow"><code>UIComponent</code></a> base class (like <code>binding</code> and <code>rendered</code>).</p>
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    1. POHow to trigger the change of a h:inputHidden by JavaScript
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    1. COThanks for answering! As to the other questions in the question: Is there a major drawback of this approach. Or asked the other way around: Would you implement this fundamently differently?
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    2. COAs to when to create a composite or a custom component, head to http://stackoverflow.com/q/6822000/ I'd have preferred a custom component like `<pe:triStateCheckbox>`: http://fractalsoft.net/primeext-showcase-mojarra/views/triStateCheckbox.jsf But if this is "too hard" for you and for internal usage only, a composite is of course also okay as long as it does the job you need.
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