How do I determine a user's SharePoint group membership using the client object model?

Question

I want to redirect users from a landing page to another page in SharePoint 2010, based on their group membership. I need to do this using JavaScript (ECMAScript) and not server side code.

Answer 1

You can get the group collection of a site and enumerate over it to find a specific group. You can then enumerate the members of the group to find the current user.

function onGetSharePointGroup() {
        var context = SP.ClientContext.get_current();
        var groupsEnum = this.groupCollection.getEnumerator();
        while (groupsEnum.moveNext()) {
            var group = groupsEnum.get_current();
            if (group.get_title() == "GROUP NAME TO FIND") {                    
                this.members = group.get_users();
                context.load(members);
            }
        }
        if (members != null) {
            context.executeQueryAsync(Function.createDelegate(this, this.FindCurrentUser), Function.createDelegate(this, this.onFailure));
        }
    }

Answer 2

You could wrap your redirect inside a SPSecurityTrimmedControl

<Sharepoint:SPSecurityTrimmedControl runat="server" PermissionsString="ViewListItems">
  ...Put your redirect in here...
</SharePoint:SPSecurityTrimmedControl>

Here are the values you can use for PermissionString.

If you want to find users that do NOT have a certain permission, this code would work better:

<script>
  var allowUserOnPage=false;
</script>
<Sharepoint:SPSecurityTrimmedControl runat="server" PermissionsString="ViewListItems">
  <script>
    allowUserOnPage=true;
  </script>
</SharePoint:SPSecurityTrimmedControl>
<script>
  if (!allowUserOnPage) {
    ...Put your redirect in here...
  }
</script>

Answer 3

You can use a content editor web part for your script then use audience targeting on the webpart to determine what groups should see it.

Answer 4

You can actually do this using a generic HttpHandler and call from the client browser. Will share you some code sample later.

Answer 5

You can look at http://spdailytips.blogspot.com/2011/09/check-current-user-permission.html

Answer 6

You can get the groups in client side Silverlight app by calling the GetGroupCollectionFromUserAsync method of SharePoint's UserGroup.asmx web service. check out the link below for sample code.

http://www.innovawiz.com/get-the-sharepoint-groups-a-user-is-part-of-using-sharepoint-object-model