Hi Sabine and welcome!<div><br></div><div>Try something like: 
<span style> </span></div><div><span style><br></span></div><div><span style> script prototype element id: &#39;formB&#39;; update: [:renderer | self renderSecondListOn: renderer ].</span></div><div><span style><br></span></div>
<div><span style>renderSecondListOn: html</span></div><div><span style>       html select</span><br style><span style>                        id: &#39;listBID&#39;;</span><br style><span style>                        list: #(&#39;1&#39; &#39;2&#39; &#39;3&#39; &#39;4&#39; &#39;5&#39; &#39;6&#39;);</span><br style>
<span style>                        selected: numb</span>
</div><div><br></div><div><span style>Cheers</span></div><div><span style>Gerhard</span></div><div><span style><br></span></div><div><span style><br></span></div><div><br></div><div><br><br><div class="gmail_quote">On Fri, Jun 15, 2012 at 12:45 PM, Sabine Knöfel <span dir="ltr">&lt;<a href="mailto:sabine.knoefel@gmail.com" target="_blank">sabine.knoefel@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br><br>I have 2 lists &quot;ListA&quot; and &quot;ListB&quot; and I want to follow &quot;ListB&quot; after &quot;ListA&quot;.<br>
This means if I select a value in &quot;listA&quot;, &quot;listB&quot; (which is in another Form) should update automatically.<br>

<br>I have to use PTFactory&gt;&gt;evaluator, because I want to update more than one DOM elememts later.<br><br>I succeed in *hiding* ListB after changing selection of ListA. <br>But do not know what to send instead of &quot;hide&quot; for updating ListB with selection of ListA.<br>


<br>The value to select should be stored in an instance variable &quot;numb&quot;. This was working, when using &quot;html scriptaculous updater&quot; instead of &quot;prototype evaluator&quot;. After changing the code to use evaluator, the callback does not work anymore.<br>


<br>Cheers<br>Sabine<br>###########<br>renderListAOn: html<br>    html<br>        form: [ <br>            html select<br>                id: &#39;listAID&#39;;<br>                list: #(&#39;1&#39; &#39;2&#39; &#39;3&#39; &#39;4&#39; &#39;5&#39; &#39;6&#39;);<br>


                selected: numb;<br>                callback: [ :value | self numb: value ];<br>                onChange:<br>                        (html prototype evaluator<br>                                callback: [ :script | <br>


                                            script prototype element id: &#39;listBID&#39;.    &quot;hide&quot;<br>                                            numb inspect ];<br>                                return: false) ]<br>


###########<br>renderListBOn: html<br>    html form<br>        id: &#39;formB&#39;;<br>        with: [ <br>                    html select<br>                        id: &#39;listBID&#39;;<br>                        list: #(&#39;1&#39; &#39;2&#39; &#39;3&#39; &#39;4&#39; &#39;5&#39; &#39;6&#39;);<br>


                        selected: numb ]<br>
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<br></blockquote></div><br></div>