setting database for xp:dominoDocument via properties file - xpages

Question

I would like to set the location of a database for the xp:dominoDocument data Property via SSJS and a properties file:
<xp:this.data>
<xp:dominoDocument var="document1" action="openDocument"
formName="album - $f-album" computeWithForm="both"
concurrencyMode="force"
databaseName="#{javascript:datasource.getString('DB_FILEPATH')}">
<xp:this.documentId><![CDATA[#{javascript:context.getUrlParameter("UNID")}]]></xp:this.documentId>
</xp:dominoDocument>
</xp:this.data>
The datasource property contains e.g.
DB_FILEPATH=Bildr6Phase10Data.nsf
and is available via
<xp:this.resources>
<xp:bundle src="/datasource.properties" var="datasource"></xp:bundle>
</xp:this.resources>
The code above will cast the error:
com.ibm.xsp.exception.EvaluationExceptionEx: Error while executing JavaScript computed expression
Error while executing JavaScript computed expression
Script interpreter error, line=1, col=12: [ReferenceError] 'datasource' not found
However if I try:
<xp:text escape="true" id="computedField1"
value="#{javascript:datasource.getString('DB_FILEPATH')}">
</xp:text>
I get the value from the property.
What am I doing wrong?

Answer 1

Instead of a Computed Field, try logging datasource.getString('DB_FILEPATH') in beforePageLoad and beforeRenderResponse. Also log out a message in databaseName property. I would expect the databaseName property to be required when the component tree is first loaded. However, I would not be surprised if the resource string is loaded later.
An alternative may be to use xsp.properties file. There is code on how to retrieve a property from xsp.properties in XPages OpenLog Logger.