I would like to write a function which allows a user to enter coordinates a via a widget for a WebApplication Builder application. The user should be able to enter coordinates and the point appears on the map and posts to a feature service if the coordinates intersect with a line feature/map service. Is there a widget that already harnesses this functionality, if not, how can this be done?
There is not a widget out there for this custom workflow, but it can definitely be created as a custom widget. The main issue will be the precision that will be needed to get a point yo intersect a line.
As Robert mentioned this is a custom widget,
Below is a general description of the task at hand that might get you moving forward.
Other factors to consider is the spatial reference of the XY and error checking