Using javascript in XForms pages

You cannot call JavaScript this way from XForms. Two alternatives come to mind:

1) If your logic is simple enough, you could write it in XPath. We use
XPath 2.0, so you can do pretty sophisticated just with XPath.

2) If the logic is more complex, you can trigger a submission
replace="instance" and have the value calculated on the server-side by
a "service".

Alex

On 3/22/06, [hidden email] [hidden email] wrote:
  

Good day everyone.

   I have the following problem: developing an application using Orbeon Presentation Server (aka OPS), I need an additional action to be performed using simple javascript code. I know at this stage, that javascript chunks can be declared between <script> and </script> tags. But, as I tried, I can only call a function when page loads. The documentation regarding this problem is still unaccessible for me (perhaps it doesn't exist). I have found something regarding this:

<xhtml:script>
  function javascriptfuction()
  {
    ...
  }
</xhtml:script>

<xforms:input ...>
   <xforms:action ev:event="xforms-value-changed">
       ...
       <xforms:setvalue ref="instance('dummy')/dummy" value="inline:javascriptfuction()">
   </xforms:action>
</xforms:input>

But it tells me that "inline" prefix is not defined.
Can anyone help me?




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Adrian,

In XForms, in a number of places you can use XPath expressions. In
those XPath expressions you can use any of the function defined in the
"XQuery 1.0 and XPath 2.0 Functions and Operators" specification [1].
When those functions are not enough, you can either:

1) Call an "extension". Right now we allow XPL to be called with the
XPath xxforms:call-xpl() function. We could extend this allow other
type of functions to be called. But those functions would be defined
on the server side, as the XPath is evaluated on the server side. To
answer your question specifically, allowing a JavaScript function
defined in the HTML to be called from XPath would be "difficult", and
I don't think you should expect this to be implemented in the near
future.

2) When you need to do more than when you can do in standard XPath,
IMHO it is better to call a service: use a submission
replace="instance" to call a pipeline or other endpoint that
implements the piece of functionality you need. This is more portable,
simpler to debug, and reusable.

[1] http://www.w3.org/TR/xpath-functions/

Alex

On 3/23/06, Adrian Baker [hidden email] wrote:
  

 Do you see this as temporary limitation of OPS which might be later
implemented, or a permanent restriction?


 Alessandro Vernet wrote:
 You cannot call JavaScript this way from XForms. Two alternatives come to
mind:

1) If your logic is simple enough, you could write it in XPath. We use
XPath 2.0, so you can do pretty sophisticated just with XPath.

2) If the logic is more complex, you can trigger a submission
replace="instance" and have the value calculated on the server-side by
a "service".

Alex

On 3/22/06, [hidden email] [hidden email] wrote:


 Good day everyone.

 I have the following problem: developing an application using Orbeon
Presentation Server (aka OPS), I need an additional action to be performed
using simple javascript code. I know at this stage, that javascript chunks
can be declared between <script> and </script> tags. But, as I tried, I can
only call a function when page loads. The documentation regarding this
problem is still unaccessible for me (perhaps it doesn't exist). I have
found something regarding this:

<xhtml:script>
 function javascriptfuction()
 {
 ...
 }
</xhtml:script>

<xforms:input ...>
 <xforms:action ev:event="xforms-value-changed">
 ...
 <xforms:setvalue ref="instance('dummy')/dummy"
value="inline:javascriptfuction()">
 </xforms:action>
</xforms:input>

But it tells me that "inline" prefix is not defined.
Can anyone help me?




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mailing list.
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For general help: [hidden email]
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Blog (XML, Web apps, Open Source):
http://www.orbeon.com/blog/



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Finally,
  

In general we use either:

1) An <xforms:switch>, with <xforms:case> and <xforms:toggle>
2) or <xforms:group> bound to a node that has a bind saying if that
node is relevant or not. If the node is not relevant, then the
corresponding group will not be displayed.
    

The switch control is not suitable for the situation. But, please tell me: can the group bound to a node to be set as layered (like old way: style="position:absolute; z-index=1000;")?