Username taken check with jquery validate plugin - php

Question

I am trying to use the username taken or not using jquery validate plugin. but dosent seems to work. I would like to know where I went wrong, all other validation works fine. except for this.
jquery validate plugin page: http://bassistance.de/jquery-plugins/jquery-plugin-validation/
javascript
<script type="text/javascript">
$(document).ready(function(){
$("#register").validate({
debug: false,
rules: {
username: {
required: true,
minlength: 2,
remote: "users.php"
},
email: {
required: true,
email: true
},
password: {
required: true,
minlength: 5
},
confirm_password: {
required: true,
minlength: 5,
equalTo: "#password"
}
},
messages: {
username: {
required: "Please enter a username",
minlength: "Your username must consist of at least 2 characters",
remote: jQuery.format("{0} is already in use")
},
email: "A valid email will help us get in touch with you.",
},
password: {
required: "Please provide a password",
minlength: "Your password must be at least 5 characters long"
},
confirm_password: {
required: "Please provide a password",
minlength: "Your password must be at least 5 characters long",
equalTo: "Please enter the same password as above"
},
submitHandler: function(form) {
// do other stuff for a valid form
$.post('adduser.php', $("#register").serialize(), function(data) {
$("#register").fadeOut('fast', function(){
$('#results').html(data);
});
});
}
});
});
</script>
users.php
<?php
$request = $_REQUEST['username'];
//usleep(150000);
$query = mysql_query("SELECT * FROM users WHERE username ='$username'");
$result = mysql_num_rows($query);
if ($result == 0){
$valid = 'true';}
else{
$valid = 'false';
}
echo $valid;
?>
register.php
<form name="register" id="register" method="post" action="">
<section>
<label for="username">Username:</label>
<div>
<input type="text" tabindex="1" class="input" id="username" name="username" value=""/>
</div>
</section>
<!--#-->
<section>
<label for="email">email</label>
<div>
<input type="text" tabindex="2" class="input" id="email" name="email" value=""/>
</div>
</section>
<!--#-->
<section>
<label for="password">Password</label>
<div>
<input type="password" tabindex="3" class="input" id="password" name="password" value=""/>
</div>
</section>
<!--#-->
<section>
<label for="confirm_password">Confirm Password</label>
<div>
<input type="password" tabindex="4" class="input" id="confirm_password" name="confirm_password" value=""/>
</div>
</section>
<!--#-->
<br/>
<input type="submit" tabindex="5" id="submit" value="REGISTER" />
</form>
<div id="results"> </div>
thanks in advance.

Answer 1

I have the same but I use their validation and this to check if username exists. It works great.
<script type="text/javascript" src="../js/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function() {
//the min chars for username
var min_chars = 3;
//result texts
var characters_error = 'username must have atleast 3 characters';
var checking_html = 'searching...';
//when button is clicked
$('#check_username_availability').click(function(){
//run the character number check
if($('#username').val().length < min_chars){
//if it's bellow the minimum show characters_error text
$('#username_availability_result').html(characters_error);
}else{
//else show the cheking_text and run the function to check
$('#username_availability_result').html(checking_html);
check_availability();
}
});
});
//function to check username availability
function check_availability(){
//get the username
var username = $('#username').val();
//use ajax to run the check
$.post("checkuser.php", { username: username },
function(result){
//if the result is 1
if(result == 1){
//show that the username is available
$('#username_availability_result').html('<span class="is_available"><b>' +username + '</b> is available</span>');
//this is the id of my save button it'll display if available
$('#newacct').css("display", "inline");
}else{
//show that the username is NOT available
$('#username_availability_result').html('<span class="is_not_available"><b>' +username + '</b> is not available</span>');
}
});
}
</script>

Answer 2

First, you have an extra } that is closing your messages option prematurely, leading to the remaining messages being ignored. You should move this } after the confirm_password message block. Second, you should be calling jQuery.validator.format rather than jQuery.format. I believe this is why this particular validation rule doesn't work. Correct these and see if it works for you.

Answer 3

To answer the OP, you might want to use $_GET. Also, mysql_num_rows has been deprecated as of PHP 5.5.0, so you'll probably want to update that. You could just check if the query returns false.
<?php
$request = $_GET['username'];
//usleep(150000);
$query = mysql_query("SELECT * FROM users WHERE username ='$username'");
if ($query == false){
$valid = 'true';} // username available
else{
$valid = 'false'; // username unavailable
}
echo $valid;
?>

Answer 4

Try this......
JS
$("#register").validate({
debug: false,
rules: {
username: {
required: true,
minlength: 6,
remote: {
url: "Your PHP",
type: "post",
data: {
funct: 'user_check',
username: function() {
return $( "#username" ).val();
}
}
}
},
messages: {
username: {
required: "Please enter a username",
minlength: "Your username must consist of at least 2 characters",
remote: jQuery.format("{0} is already in use")
}
});
});
PHP
<?php
function user_check(){
$username = $_POST['username'];
$query = mysql_query("SELECT * FROM users WHERE username ='$username'");
if ($query == false){
$valid = 'true';} // username available
else{
$valid = 'false'; // username unavailable
}
echo $valid;
}
?>
May help..