I have found a solution. I am not sure if this is the "best" way to handle my scenarios, but they seemed pretty staightforward to me. If someone has a suggestion they think is a better solution than what I came up with, please reply.
This is my aspx code, Javascript code, and code-behind:
I am using the RadAjaxManager to call server-side code from Javascript. My RadAjaxManager event will determine, based on the event argument, what processing needs to be done.
The
lbtnClearAllSignatures linkbutton simply calls the radConfirm. Inside this RadConfirmCallback function, I call my server-side method using the RadAjaxManager.
The
lbtnClearSignature linkbutton was the tricky one. This is inside a repeater, and if confirmed, I need to clear based on a specific ID. So I call a "wrapper" javascript function, passing to it the ID I need. Inside this "wrapper" function, I call the radConfirm...etc.
As I stated previously, not sure if this is the "best" solution for how to call a server-side function from Javascript...and how to pass a value from javascript to server-side...but it worked for me.