title: Implementing Wordpress-style Ajax tags
body: <p>This is my first question, so please be gentle with me :). I have tried to search for the answer, but I don't really know what the thing I'm after is called so can't formulate a decent search query. </p>
  
  <p>I'm after making the input forms on a database of online resources as user-friendly as possible, to encourage users to add some decent metadata, in particular tags (keywords). I very much like the Wordpress and Flickr approach to adding tags, where you attach tags in an input field and they appear below the field with a 'X' beside them for users to 'un-attach' tags from the record. This is plainly an Ajax operation, but without some serious source code digging I can't figure how it works. If anyone knows what I'm talking about, could you suggest an algorithm or even a search term to use, as I'm not sure what these things would be called - Ajax tags, perhaps? I did search for "Ajax tags" but got heaps of results, and couldn't see anything relevant in the first few pages. </p>
  
  <p>I'm using PHP and mySQL on the server, jQuery on the client. </p>