Validating username without page load

Im following this site (www.keepern.com) for a while now.

I just wonder how did they do the [check availability] functionality on the signup page www.keepern.com/signup

 

its juz an ajax effect...nothing wonder in it

 

Yes I know its Ajax, but what I want to know is how, can someone provide a sample code to do this.

 

Your best bet is to use an AJAX framework (like glm-ajax), then read the manual for it. You should then be able to script exactly what you want.

 

http://w3schools.com/ajax/ajax_database.asp

here is the example for you....instead of showing the table ...you are going to show the username availbilty checking in database....

put javascript action onblur instead of onchange

 

Its just jquery+ajax (xml http request) effect for this username availability check. you can look at the source to see how this is made to happen.