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Is it possible to create custom field control and custom edit forms for sharepoint online?

Would like to do the same as explained in but instead for sharepoint online. Point is that in sharepoint online, you're not able to write to the CONTROLTEMPLATES folder. Anyone has experience/solution?

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As of today, Developing a sandboxed solution is the only way you can upload and run custom code in SharePoint Online and Custom Field Types are not supported in a Sandboxed solutions. So it is NOT possible.

Check this white paper to understand what you can do with SharePoint online: SharePoint Online for Office 365 Developer Guide

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Thanks for the info. Was already afraid that it would not be possible to create Custom Field Types, pity. – rob de beir Jan 14 '12 at 20:03
yes, I hope the situation improves and they find way ways to overcome the limitations. – Ashish Patel Jan 14 '12 at 20:14

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