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    <p>The <code>select</code> element is a poor match for your requirements because it only has a single node binding. Instead of trying to subvert the control's semantics in that way, I would use a <code>repeat</code> of <code>trigger</code> elements with <code>insert</code> and <code>delete</code> actions, styled with CSS in such a way as to provide the appearance of a multi-selection control.</p> <p>Your question doesn't mention the format of the data, but supposing instance data like this:</p> <pre><code>&lt;xf:instance id="options"&gt; &lt;options xmlns=""&gt; &lt;option selected="false"&gt; &lt;first /&gt; &lt;/option&gt; &lt;option selected="false"&gt; &lt;second /&gt; &lt;/option&gt; &lt;option selected="false"&gt; &lt;third /&gt; &lt;/option&gt; &lt;option selected="false"&gt; &lt;fourth /&gt; &lt;/option&gt; &lt;option selected="false"&gt; &lt;fifth /&gt; &lt;/option&gt; &lt;/options&gt; &lt;/xf:instance&gt; &lt;xf:instance id="results"&gt; &lt;results xmlns="" /&gt; &lt;/xf:instance&gt; </code></pre> <p>Then you should be able to get the behaviour you want with something along these lines (not tested):</p> <pre><code>&lt;xf:repeat id="repeat" nodeset="instance('options')/option"&gt; &lt;xf:trigger appearance="minimal"&gt; &lt;xf:label&gt; &lt;xf:output value="name(*)" /&gt; &lt;/xf:label&gt; &lt;xf:action ev:event="DOMActivate" if="@selected = 'false'"&gt; &lt;xf:setvalue ref="@selected" value="'true'" /&gt; &lt;xf:insert origin="instance('options')/option[index('repeat')]/*" context="instance('results')" nodeset="*" at="count(../*)" position="after" /&gt; &lt;/xf:action&gt; &lt;xf:action ev:event="DOMActivate" if="@selected = 'true'"&gt; &lt;xf:setvalue ref="@selected" value="'false'" /&gt; &lt;xf:delete nodeset="instance('results')/*[name(.) = name(current()/*)]" /&gt; &lt;/xf:action&gt; &lt;/xf:trigger&gt; &lt;/xf:repeat&gt; </code></pre>
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    1. USPhil Booth
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