Hi,<br><br>I am trying to create a form where there are two select menus, both using dynamic_options, where one is the parent menu that is chosen first and based on the selection(s) there is a refresh and the second menu gets populated based on the first menu&#39;s choice(s).<br>
<br>&lt;param name=&quot;names&quot; type=&quot;select&quot; multiple=&quot;true&quot; optional=&quot;true&quot; dynamic_options=&quot;dyn_options(&#39;names&#39;)&quot; refresh_on_change=&quot;true&quot; label=&quot;Filter By Names&quot;/&gt;<br>
&lt;param name=&quot;values&quot; type=&quot;select&quot; multiple=&quot;true&quot; optional=&quot;true&quot; dynamic_options=&quot;dyn_options(&#39;values&#39;, $names)&quot; label=&quot;Filter by Values&quot; /&gt;<br><br>
There seems to be a problem when the form loads for the first time as $names is not selected yet.  I get a syntax error like &quot;Invalid string&quot;, when I remove $names as a parameters from my second dynamic_options function call everything is fine.  Does someone know how to achieve the functionality I&#39;m aiming for in Galaxy without having to use the deprecated &lt;pages&gt; tags?  Is there a way in Cheetah to set a default value for $names and if so how would I do this in the tool xml?<br>
<br>regards,<br>Leandro<br><br>