I have updated the cascading dropdown solution to support multi choice in all positions. Refer this article for setup instructions and background information.
To use multichoice on the select, you must use a multiline plain text field as “placeholder”, and address the field like the field “ThisListField2” in the “spjs.casc.init” function:
spjs.casc.init({ lookupList:"NameOfYourList", lookupListBaseUrl:"BaseUrlOfYourList", lookupListFields:["LookupListField1","LookupListField2"], thisListFields:["ThisListField1","ThisListField2:multi"],
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If you plan to use this with DFFS you must update to DFFS backend v4.259 to support the “:multi” suffix in the cascading dropdown configuration.
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Alexander