Attached I am sharing a custom XBL component I've created for entry of multiple values in a single input field. The component behaves like an xforms:input, but its value is treated as a list of delimited values (comma, space, or other). The values gets split/tokenized into separate elements in the model, populated based on the specified template.
Example:
<xf:model id="model">
<xf:instance id="instance" xmlns="">
<values/>
</xf:instance>
<xf:instance id="template" xmlns="">
<root>
<value ref=""/>
</root>
</xf:instance>
</xf:model>
...
<of:delimited-input base="value" nodeset="value/@ref" template="instance('template')/value"
delimiter="','" normalize-space="true()" incremental="true" xxforms:size="55"/>
Entering the value "1,2,3,4,5", for example, will result in the following instance:
<values>
<value ref="1"/>
<value ref="2"/>
<value ref="3"/>
<value ref="4"/>
<value ref="5"/>
</values>
We could have used an XML list type (e.g. @refs="1 2 3 4 5") for the same purpose, but there were a few limitations: XML lists are a) space-delimited only b) devoid of structure (would need to change the schema to add sub-elements) and c) are not yet supported (?) natively by XPath 2.0 (i.e. requires tokenize() to process individual items). This component tries to give the best of both worlds; we can access values using a standard XPath like @ref, but the UI may be compressed to one input field, or broken up into separated ones once/if the need arises.
Hope this helps,
Gino
Note: dropped into WEB-INF/resources/apps/xforms-sandbox/ and access
http://localhost:8080/orbeon/xforms-sandbox/sample/delimited-input-test or equivalent to test:
delimited-input.xbldelimited-input-test.xhtml
Gino Miceli
Forest Information Systems Specialist
Food and Agriculture Organization of the United Nations
FAO-Finland Cooperation Programme
Sustainable Forest Management in a Changing Climate
Forest Management Division, Rm. D-406
Viale delle Terme di Caracalla, s.n.c.
00153 Rome, Italy
http://www.fao.org/forestry
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