I'm making my own component in XBL and I have to use a submission within it. I have two parameters (resource, XPath) of the submission which users can provide in Form Builder (like with the autocomplete control):
<xbl:binding element="fr|myControl" id="fr-myControl" xxbl:mode="lhha binding value">
<metadata xmlns="....">
....
<templates>
<instance label=""/>
<view>
<fr:myControl id="" appearance="minimal" xpath="" xmlns="" resource="" >
<xf:label ref=""/>
<xf:hint ref=""/>
<xf:help ref=""/>
<xf:alert ref=""/>
</fr:myControl>
</view>
</templates>
<control-details>
<xf:input ref="@resource">
....
</xf:input>
<xf:input ref="@xpath">
....
</xf:input>
</control-details>
</metadata>
....
And then I want to call a REST submission, with resource and result XPath provided by the user in form builder (@resource
and @xpath
):
<xf:model>
<xf:instance id="result"><value/></xf:instance>
<xf:instance id="sub"><value/></xf:instance>
<xf:instance id="resource"><value/></xf:instance>
<xf:instance id="xpath"><value/></xf:instance>
....
<xf:submission id="my-submission" instance="sub"
mediatype="application/xml"
method="get"
resource="{instance('resource')}"
replace="instance"
serialization="none"/>
<xf:action id="populate-data-binding">
<xf:action context="instance('sub')"
ev:event="xforms-submit-done"
ev:observer="my-submission">
<xf:action>
<!-- there is a problem-->
<xf:var as="xs:string" name="control-value" value="instance('xpath')"/>
<xf:setvalue ref="instance('result')" value="$control-value"/>
</xf:action>
</xf:action>
</xf:action>
</xf:model>
....
<xf:var name="resource-avt" xbl:attr="xbl:text=resource" xxbl:scope="outer"/>
<xf:var name="resource" xbl:attr="xbl:text=resource" >
<xf:action ev:event="xforms-enabled xforms-value-changed">
<xf:setvalue ref="instance('resource')" value="$resource"/>
</xf:action>
</xf:var>
<xf:var name="xpath-avt" xbl:attr="xbl:text=xpath" xxbl:scope="outer"/>
<xf:var name="xpath" xbl:attr="xbl:text=xpath" as="xs:string">
<xf:action ev:event="xforms-enabled xforms-value-changed">
<xf:setvalue ref="instance('xpath')" value="$xpath"/>
</xf:action>
</xf:var>
My problem is in the highlighted line above: in instance('xpath')
I have the value of the parameter provided by the user in Form Builder for example: /pathToResult
. And I want to get the part of the XML result from the submission resource associated with /pathToResult
. But unfortunately in instance('result')
there is: /pathToInstance
instead of the expected result, for example for the response XML:
<xml>
<blabla>bla</blabla>
<pathToResult>MY RESULT !!!</pathToResult>
</xml>
the expected value of result-instance is: MY RESULT !!!
instead of /pathToResult
.
However if I modified the code like this:
<xf:var as="xs:string" name="control-value" value="/pathToResult"/>
it works well, but in this case the path is hardcoded. I want instead to give opportunity to the Form Builder user to specify the XPath expression in the control configuration.
How can I modify my code to reach expected effect?