The ArcGIS Survey123 web app returns 'null' as a string from the attributes of a JSON output of a feature layer query.

解决办法

Add another condition to the visible expression to show the question if those attributes are null or if the string length is less than 1. For example:

• Current expression: string-length(pulldata("@json", ${projekt_json}, "attributes.ist_planung_oktober_2022"))<1
• Updated expression: pulldata("@json", ${projekt_json}, "attributes.ist_planung_oktober_2022")="null" or string-length(pulldata("@json", ${projekt_json}, "attributes.ist_planung_oktober_2022"))<1

重现步骤