Lift

To create a confirmation dialog for a deletion one can find an example in the Liftweb group which shows a snippet method like this:

def deleteRhodeIsland() = SHtml.ajaxButton(Text("Delete?"), 
      () => JsRaw("$.blockUI({ message: " + (</p><h1><br /> 
                                             Do you want to delete Rhode Island? 
                                              { 
                                              SHtml.ajaxButton("yes", () => { println("deleted Rhode Island...");JsRaw("$.unblockUI();").cmd }) 
                                              } 
                                              <button onclick="$.unblockUI()">no</button></h1><p>).toString.encJs +
       " });").cmd) }

When using this, you need to incorporate the jquery.blockui.js file which can be downloaded here:
https://raw.github.com/malsup/blockui/master/jquery.blockUI.js

Apart from that you should add this resource in /src/main/resources/toserve and allow access to it using (in Boot.scala)

ResourceServer.allow {
  case "jquery.blockui.js" :: Nil => true
}

After adding the file like this

<script id="jquery-blockui" src="/classpath/jquery.blockui.js" type="text/javascript" />

in the page (good place would be default.html) the above code should work.