Sylvain Wallez

Marc shows how Cocoon's Flowscript makes things really easy. I have the same set of utilities, and even went further with dialogs:

var option = sendOptionDialogAndWait(
    "Item " + item.name + " already exists. What do you want to do?",
    ["Overwrite", "Rename", "Discard"]
);
switch(option) {
    case 0:
        doOverwrite(data);
        sendInfoDialog("Old item has been overwritten");
        break;
    case 1:
        doRename(data);
        break;
    case 2:
        if (confirm("You will loose your changes. Discard anyway?")) {
             return;
        }
 }

If you read this with a Swing GUI in mind, this is no magic. But hey, it's a web application! Flowscript and its continuations allows people to build interactions they would have never thought being possible.

"Untwist your mind, things are easy again": that's what I say during Cocoon trainings!