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Node Visibiliy
GELLO code will be used to display an ELEMENT node or not. GELLO for node visibility can also be applied for CLUSTERs or data groups. This is important for:
- managing computer screen real estate
- developing 'smart forms' that show and hide nodes depending on value(s) entered elsewhere in the archetype tree
- excluding non-visible nodes from the resulting HL7 message
Apple archetype example
Lets go back to the apple archetype. The example here will add GELLO node visibility to 'Total Cost'. When values have been entered for the higher nodes 'Cost' and 'Number', and the IsCalculated tag isCalculated attribute GELLO has calculated a value , we may decide its fair enough to make the node visible. Another example where node visibility is useful has been in the pathology domain, where calculation of certain values need only be done and displayed where certain other fields have been entered, eg the calculation of electronic glomerular filtration rate (eGFR).
Open CEN13606CEN1-Apple.v1.xml again. Set the VisibleAtStart metadata tag for 'Total Cost' on the RHS to false. We will use the isVisible attribute.
Here's a walk through of the GELLO required:
Usual beginning - already done:
No Format let o:observation = parameter[1]Context CEN_Apple_v1::ArchetypeRoot
See if 'Cost' and 'Number' have values. This time we'll just retrieve them as the general type/class Observation:
No Format letLet o1cost: Observation = if o.isdefined() then o.find_observation('1.2') else o endif let o2template.Apple.Cost Let number: Observation = if o.isdefined() then o.find_observation('1.3') else o endiftemplate.Apple.Number
Set up the test:
No Format let VisA:booleanBoolean = if o1cost.isDefinedoclIsDefined() then ifIf o1cost.value_asPQ.oclAsType(PQ).value > 0.0 then true else false endif else unknown endif
No Format let VisB:booleanBoolean = if o2number.isDefinedoclIsDefined() then if o2 If number.value_asReal.oclAsType(Real) > 0.0 then true else false endif else unknown endif
Run the test and return the result (as a boolean):
No Format Let Resultresult : Boolean = If VisA = true and VisB = true then true else false endif
No Format Resultresult
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