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From my understanding from this post (http://sharepoint.stackexchange.com/questions/23597/best-practice-to-handle-items-modification-in-sharepoint-2007), SharePoint uses optimistic concurreny e.g.

  • User A opens up edit form and starts editing
  • User B opens up ...
  • User A saves
  • User B clicks save but SP warns them that the data has changed since they started editing and will make the user B view User A's changes and re-enter.

Currently, I have a HTML form that will allow user to edit some list items, so I was wondering what I should do in SPServices to do the following:

  • getting that SP warning message for User B and
  • getting that User A's changes into the HTML form so that User B can view it?
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Each time you update an item, one of the fields returned is the latest changed date/time. You can build your concurrency logic using that date/time, looking at it vs. the date/time prior to your update. It will require a few extra Web Service calls, but if it's important to maintain integrity, it works.

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  • I think that multi workflows (which you describe as concurrency logic) will be pretty useful.
    – Anderson Karu
    Commented Jan 5, 2012 at 8:48

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