Running javascript after a reRender?

[nickthomson]

I have an a4j:region that by default is not rendered. Within this region is a javascript tag with some javascript I'd like to run when the region is rendered (example below, there are more items in there, but the cutdown test I have doesn't contain anything else).

If I allow the region to be rendered by default the script is run, however when the region is not rendered by default but reRendered from a (for example) button, the script is apparently not run.

Is there a better (correct?) way of doing this?

<a4j:region id="testRegion" rendered="#{testBean.testRendered}">
 <script type="text/javascript">
 alert('test Region rendered');
 </script>
</a4j:region>

<a4j:commandButton value="test" action="#{testBean.toggleRendered()}" reRender="testRegion" />

Thanks.

[ilya_shaikovsky]

1) use outputPanel instead of region.
2) conditionally rendered elements should not be reRendered. you should update some parent.

[nickthomson]

Thanks Ilya, I've been at this project so long I'm missing the obvious.