How to implement something similar to Stack Overflows Tag's widgets?

In Stack Overflow, have noticed that once one is done writing an post and starts entering in specific tags inside the Tags text field , that the text of the tags becomes a cool little widget which is deletable via the X button (located on this widget).

May I ask if开发者_如何学运维 there is a popular 3rd party library that one can use to emulate this same situation ? That someone types something into a text field and the individual words inside the text field becomes turned into some ui element with an X on it ?

Otherwise, how can someone code a mechanism like this him / herself ? What type of CSS/HTML/JavaScript be needed ? Are these visual tags <div>s?

Thank you for taking the time to read this.

Check out Textboxlist.

http://harvesthq.github.com/chosen/ will transform your everyday <select> and <option> elements into this format. plus no license fee (although I wouldn't argue TextboxList's $20 fee is unreasonable)