I asked the same question last week, and I'm still waiting for an
answer:
http://groups.google.com/group/opensocial-orkut/browse_thread/thread/e4fd97798a9ac9a6#
I few tests I already made, all failures:
<h5 if="${viewer == null}">Viewer does not have App (A)</h5>
<h5 if="${!viewer}">Viewer does not have App (B)</h5>
<h5 if="${typeof(viewer) == 'undefined'}">Viewer does not have App
(C)</h5>
Sample gadget here:
http://badaro.labone.net/ostemplates/gadget
On Apr 4, 8:20 pm, aj <a7a4.s...@gmail.com> wrote:
> In my widget I would like to change the messaging if the visitor does
> not have the widget installed. But I don't see a way to perform this
> check correctly
>
> <Require feature="opensocial-0.9" />
>
> <script xmlns:os="http://ns.opensocial.org/2008/markup"; type="text/
> os-data">
> <os:ViewerRequest key="theviewer"/>
> </script>
>
> <script type="text/os-template">
> <div if="${'theviewer' != ''}">
> <p>1.Viewer is not null</p>
> </div>
>
> <div if="${empty theviewer }">
> <p>2.Viewer is empty</p>
> </div>
>
> <div if="${ 'theviewer' =='' }">
> <p>3.Viewer is empty</p>
> </div>
>
> </script>
>
> 1.Viewer is not null, is printed always
> 2.Viewer is empty , is never printed.
> 3.Viewer is empty, is never printed.
>
> What is the correct syntax? Is this documented somewhere in entirety?
>
> Thanks,
> AJ
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