Ajax and ED

It's time for more Ajax...

Here's the problem I'm running into with ED. When the user hits the submit button. The javascript calls a Servlet which composes the SPARQL/Update Insert statements and then submits them to the Virtuoso Server.

I have to break up the Insert statements into an Insert for Tagging information (taggedBy, taggedResource, taggedOn, etc) and an Insert for each Tag in case it doesn't already exist. The Tag Insert can be a small Insert statement or a big one depending on how many types it has. The more types it has, the bigger it is because I have to create the Type in case it doesn't already exist.

So for each insert I'm doing a Post to the Virtuoso Server awaiting reply before I continue and send off the next one.

Thus, with the more tags there are, the more Posts I'm making, the longer it takes, especially if it takes a while for the information to go across the wire and back. (What if someone's tagging in Africa!). I COULD spawn several threads to do a submission for me for the tags to avoid the "stop and wait" protocol I'm using right now...

OR

as Ben suggested. I can use Ajax!

Question is. How do I use Ajax? Well here's what I'm thinking right now...
Ajax let's me talk to the Server and tell it to do a function without having to reload a page.

When someone adds a new tag. I'll use Ajax to submit that tag (since a tag is independent of a user until you make a connection using the "associatedTag" property) to Virtuoso. I'll leave the associatedTag property for later when the user ACTUALLY hits submit.

If the tag already exists, *shrug... user doesn't know.
If the user deletes the tag... the tag will still be added, but it won't be associated with the actual tagging, since it won't be included in the submit.

Trouble: What if a post to the Virtuoso Server fails? I guess I'd have to check for that...