I had a chance to work with jQuery in SharePoint 2010 recently which was fun and easy.
The task was to show a select set of users a modal window with text that comes from the legal department. Already having a settings list with key value pairs stored as list columns in SharePoint. It was just a matter of selecting the legal statement from this list and displaying it in a pop up.
Flow of events
Get Current User
Check to see if the user is a member of the special people SharePoint security group.
Check to see if the user had already logged a click event for that day.
If no, then proceed to query the list for the disclaimer text.
Fire off a jQuery append to the hidden div on the page.
Fire off a call to the SP.UI.ModalDialog with handlers for the yes/no actions. (Figure 1).
On yes, write a record to a List that records the user click for tracking purposes.
Dismiss the modal and write out a thank you to the user via the SP.UI.Notify.addNotification method. (Figure 2).
On no, kindly remind the user the site won’t be available until they agree. (Figure 3).