Validation Form - User Availability

Question

I am doing a user registration UI for a web project. Our
database has usernames unique. I dont want the user to create an
account, submit form, then come back and see they have an error:
username is already taken. I would like to put a button next to the
username input field called Check. This button i want it to check
the username availability. I have a php function that returns true
or false depending on the username check. I want this to be a
validation widget to my input field. Can this be done using spry
1.6? If, yes could you point out some hints?

Answer 1

Hi,
you can achieve this behavior by using Spry sending the
username when the Check button is pressed and receiving as response
the xml with the existent usernames. Your custom function will
submit the form via XHR. The callback function will interpret the
response from the server.
You can see an example on this
page.
Also you should consider a security issue if you return the
xml containing the usernames, because it will be available for all
Diana