Prepopulating forms about lforms

[plynchnlm]

That kind of loading of data would normally be done by loading data from a QuestionnaireResponse. See http://lhncbc.github.io/lforms/#merge-fhir-data.

[whollervi]

Ok thanks, that’s what I do when reloading a form that already has a QuestionnaireResponse. So after loading (before rendering) the FHIR Questionnaire, I would need to first retrieve the empty QuestionnaireResponse LForms.Util.getFormFHIRData() then prepopulate the answers using linkids and merge the lform with the prepopulated QuestionnaireResponse, right? One problem I see with this approach is, that there seems to be no option with getFormFHIRData() to also retrieve empty answers like it’s the default with getFormData() (see noEmptyValue option). On 3. Jul 2023, at 19:20, plynchnlm ***@***.***> wrote:  That kind of loading of data would normally be done by loading data from a QuestionnaireResponse. See http://lhncbc.github.io/lforms/#merge-fhir-data. — Reply to this email directly, view it on GitHub<#132 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BA6NLU5YMCBJHWURT7G3A7LXOL5NJANCNFSM6AAAAAAZ4V7UYI>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[plynchnlm]

That is true-- QuestionnaireResponses don't contain empty answers. Are you trying to pre-populate with data from the patient's record? LHC-Forms supports populating from FHIR Observations (https://build.fhir.org/ig/HL7/sdc/populate.html#obs-pop) and also from the Patient resource via the launchContext extension (https://build.fhir.org/ig/HL7/sdc/populate.html#exp-pop).

[whollervi]

Thanks for pointing me to the launchContext extension, which looks promising.

For now I'll create a QuestionnaireResponse out out the original Questionnaire and prepopulate it before merging with the Questionnaire ...

Thanks for your help!

[plynchnlm]

If you are going to do that, you could also just work with LHC-Forms' internal data structure, in which the answers and form definition are together. The call would be LForms.Util.convertFHIRQuestionnaireToLForms(fhirData, fhirVersion) (see http://lhncbc.github.io/lforms/#convert-fhir-data), where fhirData is the Questionnaire, and the return is the internal format form definition which can have 'value' fields placed in items. The drawback is that this internal format might change some day, and the 'value' field is not documented, since we only documented the definition part of the format, and not the user data part.