JavaScript Change Function No Longer Working After Nintex Forms Upgrade

Issue

After upgrading Nintex Forms to version 2.7.0.0 or above, JavaScript change function might stop working.

Resolution

Import legacy Lookup Control in Central Admin and use this control when using JS change function:

1. On the Central Administration home page, click Nintex Forms Management.
2. On the Nintex Forms Management page, click Manage Form Controls.
3. Under the Form Control Types table, in the Import text box, enter the following text:

   Nintex.Forms.SharePoint.FormControls.SharePointLookupFormControlV1, Nintex.Forms.SharePoint, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c52d764dcf7ec883

4. Click Import