Comments on: jQuery PHP & MySQL Username Availability Checker

By: Joyel Puryear

Joyel Puryear — Tue, 29 Jun 2010 14:27:50 +0000

I just recently implemented what you showed here in your blog. It is very affective. I wanted to offer another bit of feedback on how to slow some of the hit on the server (if your validating by email address). If your validating by email address then you can validate on valid email address. Meaning along with 4 characters, if you also check to make sure it’s a valid email BEFORE hitting the server it’ll restrict some of the flow to the server. However you can only do that if it’s a email address that’s being used as the username (which ends up happening a lot, at least in the systems I build).

Either way it was a great idea and a very nice/clear implementation.

—–
http://www.infotechnologist.biz
http://www.realmofwriting.com

By: Ashley

Ashley — Wed, 09 Jun 2010 12:06:01 +0000

@ Gary,

I’d recommend adding javascript email validation to the input field then on the callback if the email is valid run the function to see if the email exists in the database, so you’ll always be checking valid email addresses against the database minimising database connections.

By: gary

gary — Wed, 09 Jun 2010 11:51:13 +0000

Hi,
I want to check if an email exists. I have used this on the email field but if you put an incomplete email it will accept it and show a green tick and border.

By: Dominican Republic villas

Dominican Republic villas — Sun, 06 Jun 2010 15:53:33 +0000

Excellent, I tried it and it worked like a charm. I`m into a lot of programming for the company I work for.

By: Ronald

Ronald — Wed, 26 May 2010 21:34:05 +0000

Sometimes, when you type very fast, and it switches the cross for the checkmark or vice-versa, it liked to “skip” to hide() the old icon for me, and I ended up having both icons showing next to each other. I’m assuming this can happen when the routines overlap, especially when you add in more than just hide() and fadeIn() like I did. For example, I am also filling a nice message into a notice box with html() before I call hide() and fadeIn().+1
+1

By: tutu

tutu — Fri, 21 May 2010 04:46:18 +0000

I can’t retrieve a set usernames from my database. how can i do it with the php page?where should i change?? Can you help me Ashley??

thanx in advance

By: tubedownloader.com

tubedownloader.com — Thu, 20 May 2010 07:35:56 +0000

By: MP

MP — Wed, 21 Apr 2010 16:30:48 +0000

How do you check the usernames? What if I want to fill an array with names and check against it?

By: Nomi

Nomi — Mon, 15 Feb 2010 10:55:19 +0000

hey Ashley, good stuff man.. i just came across your site and its very useful … keep it up

By: bobsoap

bobsoap — Sat, 13 Feb 2010 21:41:58 +0000

Great write-up, thanks for sharing. I already put it to good use and I’d like to add a tiny performance issue that I came across – and fixed:

To fix this, I simply added the fadeIn() inside of a function of hide(). My logic was that when it ges reduced to a single function, it’s less likely that it gets skipped when you type fast. It works so far for me.

On line 25 of your above code, you have

$('#tick').hide(); $('#cross').fadeIn();

…and I changed that to

$('#tick').hide(100, function() { $(this).parent().find('#cross').fadeIn(400); });

Same for the ELSE part.

It’s only a minor thing but I hope it helps. Thanks again Ashley for your great post!