Realtime Pinax signup validation with jQuery and Dajax

ajax.py

import re

from django.utils import simplejson
from django.contrib.auth.models import User
from django.core.validators import email_re

from dajaxice.decorators import dajaxice_register

from emailconfirmation.models import EmailAddress

alnum_re = re.compile(r"^\w+$")


def _is_valid_email(email):
    return email_re.match(email)


@dajaxice_register
def email_available(request, email):
    email = email.strip()
    if not _is_valid_email(email):
        return simplejson.dumps({"type": "email", "exists": "NotValid"})
    elif EmailAddress.objects.filter(email=email, verified=True).exists():
        return simplejson.dumps({"type": "email", "exists": "True"})
    return simplejson.dumps({"type": "email", "exists": "False"})


@dajaxice_register
def username_available(request, username):
    if not alnum_re.search(username):
        return simplejson.dumps({"type": "username", "exists": "NotValid"})
    elif User.objects.filter(username=username).exists():
        return simplejson.dumps({"type": "username", "exists": "True"})
    return simplejson.dumps({"type": "username", "exists": "False"})

signup.js

//	    $(function(){
//            $("#id_username").focus();
//	    	    });


    function dajax_callback(data){
	if ((data.type) == "email" ) {
	    var input_item = "input[name=email]";
	    var label_item = "label[for=id_email]";
	}
	else if ((data.type) == "username" ) {
	    var input_item = "input[name=username]";
	    var label_item = "label[for=id_username]";
	}
	if(data.exists == "True") {
	    $(label_item).css('color', '#b94a48');
	    $(input_item).css('border-color', '#ee5f5b');
	    $(input_item).next('.help-block-inline').remove();
	    if ((data.type) == "email" ) {
	    $('<span class="help-block-inline error">{% trans "This email has already been registered. Try logging in instead." %}</span>').insertAfter(input_item);
	    }
	    else if ((data.type) == "username" ) {
	       $('<span class="help-block-inline error">{% trans "This username has already been selected. Please select another username." %}</span>').insertAfter(input_item);
	    }
	}
	else if (data.exists == "False") {
	    $(label_item).css('color', 'black');
	    $(input_item).css('color', 'black');
	    
	    $(input_item).css('border-color', 'black');
	    $(input_item).next('.help-block-inline').remove();
	    
	}
	    else if (data.exists == "NotValid") {
	    $(label_item).css('color', '#b94a48');
	    $(input_item).css('border-color', '#ee5f5b');
	    $(input_item).next('.help-block-inline').remove();
 if ((data.type) == "email" ) {
	    $('<span class="help-block-inline error">{% trans "Not a valid email address." %}</span>').insertAfter(input_item);
 }
	    else if ((data.type) == "username" ) {
	    $('<span class="help-block-inline error">{% trans "Usernames can only contain letters, numbers and underscores.c." %}</span>').insertAfter(input_item);
	    }
}
    };

    function select_action(input_item) {
if (input_item == 'email') {
	    Dajaxice.myapp.email_available(dajax_callback, {'email':$('input[name=email]').val()}); }
	else if (input_item == 'username') {
	    Dajaxice.myapp.username_available(dajax_callback, {'username':$('input[name=username]').val()});
}
	else if (input_item == 'password1' || input_item == 'password2') {
	    var value1 = $("input[name=password1]").val();
	    var value2 = $("input[name=password2]").val();
	      if (value1 == '') {
            $("input[name=password1]").next('.help-block-inline').remove();
            $("input[name=password1]").after('<span class="help-block-inline error">Please enter a password.</span>');
	} else if (value2 == '') {
            $("input[name=password2]").next('.help-block-inline').remove();
            $("input[name=password2]").after('<span class="help-block-inline error">Please re-enter your password.</span>');
        } else if (value1 != value2 ) {
            $("input[name=password2]").next('.help-block-inline').remove();
            $("input[name=password2]").after('<span class="help-block-inline error">Passwords do not match.</span>');
	} else if (value1 == value2) {
	    $("label[for=id_password1]").css('color', 'black');
	    $("label[for=id_password2]").css('color', 'black');
	    $("input[name=password1]").css('color', 'black');
	    $("input[name=password1]").css('border-color', 'black');
	    $("input[name=password2]").css('color', 'black');
	    $("input[name=password2]").css('border-color', 'black');
            $("input[name=password1]").next('.help-block-inline').remove();
$("input[name=password2]").next('.help-block-inline').remove();
}
	}
    };


	    $('input').focusout(function() {
var name = this.name;
select_action(name);
    });

    $('input').focusin(function () {
var name = this.name;
select_action(name);
    });




$('form#signup_form').submit(function() {
if ($("form#signup_form span.help-block-inline.error").text())
return false;

});