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I have a requirement to pre-populate a Sitecore 9 form field from a referring page
Now in WFFM you could use the "ReadQueryString" checkbox:
or you could make use of the Rules Engine inside the Form Designer:
Does anyone know if it's possible in Sitecore Forms OOTB? Or is this something custom that I need to introduce in order to create the same functionality?
In Sitecore 9.0 it is not possible OOTB.
However, in Sitecore 9.1 they did announce field prefilling as a new feature so if upgrading when this version becomes available (should be very soon now) is an option I would do that.
If that is not an option, you could check the extension my colleague Bart has written: https://github.com/bartverdonck/Sitecore-Forms-Extensions They include prefilling based on xConnect data, but you can extend this with other sources (like the querystring as you require). More info on his solution on his blog.
