I have a custom field type that was built for SharePoint 2010 that I have installed on SharePoint 2013 Foundation. The wsp installed perfectly and I get all the same functionality.
The one problem I am having is how the information is displayed in the list view. I am inheriting an SPFieldLookup and am not doing anything to override how this is displayed in the list view.
On SharePoint 2010 it renders perfectly as a hyperlink to the item which opens the standard pop out window on click etc. On SharePoint 2013 Foundation however the html doesn't render properly at all- it is almost as though it is displaying as plain text.
SharePoint 2010:
SharePoint 2013 Foundation:
My question is how can I get the lookup value to render properly on SharePoint 2013?
The same version of the wsp in installed on both machines.
Unsure as to whether this was simply a browser or client side issue I added a standard lookup field to the list and it renders fine!
In SP 2013 by default field rendering is done on client side. Concept of JSLink has been introduced if you want to change the look and feel of field. However by ClientRender=False in new form url you can force it to server render mode.