Ribbon in SharePoint 2010

The Ribbon Bar, is one of the finest improvements that Microsoft added to Office 2007 . SharePoint 2010 follows the same path. The ribbon basically, is a toolbar that appears across the top of each page in SharePoint.

The top-level elements in the Ribbon are tabs. Each tab organizes a set of groups (like Edit.Browse) and contains a set of controls. The controls inside the groups include buttons, drop-down menus, check boxes, combo boxes, split buttons, and galleries. In short, the users now can see the options like checkOut,Check In, Edit Page,Publish Page, delete page under edit tab, on the top of the Page itself.

Performance : Now lets talk about the Performance of the ribbon in SharePoint 2010.
Cashing : The Out-of-Box ribbon in heavily Cashed. So the controls are downloaded once and are used for the rest of the site.

Client OM - In terms of Architecture, ribbon Xml defines the UI but the behavior is all controlled by the javascript. You can definitely have Client or server controls in the ribbon according to your need.

CSS UI - Ribbon has all Css layout for UI and does not uses any tables.

Clustered Images - All the Images displayed in the ribbon like icons and stuff are Clustered images, thus they reduce the round-trip to the server.

Dynamic scalling and Pop-ups - All the pop-ups are displayed dynamically.

Lastly, the big question How does Ribbon works ? - A file called CMDUI.XML stays at the web front end which contains the Out-of-Box site wide Ribbon implementation i.e. all the Ribbon UI for the entire site. In addition to this you have a CustomAction for each ribbon component. These CustomActions have CommandUIExtentions block which has CommandUIDefinitions and CommandUIHandlers which make up the activity of the ribbon component. So, when the ribbon is loaded the CommandUIDefinition merges with Out-of-Box definition in the CMDUI.XML



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