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Capturing and updating data in database via ajax without using a form

How would I use ajax to capture data and update the database via another method other than a form?

For instance, I'm trying to allow a user to input a "tag" on a website and click enter to add it to the database.

I don't want to have to use a form w/ a submit button, I want the the enter keypress event to initiate the database insert.

Currently, I'm sending the data via an ajax/jquery $.get method and sending the tag in a query string on the url.

Does my question make sense? If you want an idea of what i'm going for - check out the way evernote handles its tags on notes.

Thats what i'm going for!