echo "<form method='post' action='regprocess.php' id='registerform'>";
echo '<fieldset class="register">';
echo"<h2>Register</h2>";
echo "<ul>";
echo '<li><label for="FirstName">First Name: </label> <input type="text" name="FirstName" id="FirstName"></li>';
echo '<li><label for="LastName">Last Name: </label> <input type="text" name="LastName" id="LastName"></li>';
echo '<li><label for="Email">Email: </label><input type="email" name="Email" id="Email"></li>';
echo '<li><label for="Username">Username: </label><input type="text" name="Username" id="Username"></li>';
echo '<li><input type="button" id="check_username_availability" value="Check Availability"></li>';
echo '<div id="username_availability_result"></div>';
echo '<li><label for="Password">Password: </label><input type="password" name="Password" id="Password"></li>';
echo '<li><input type="submit" value="Register"></li>';
echo "</ul>";
echo "</fieldset>";
echo "</form>";
}
$username = mysql_real_escape_string($_POST['Username']);
//mysql query to select field username if it's equal to the username that we check '
$usernameresult = 'Select Username from User where Username = "'. $username .'"';
$uresult = $conn->query($usernameresult);
//if number of rows fields is bigger them 0 that means it's NOT available '
if($uresult->num_rows==1) {
//and we send 0 to the ajax request
echo 0;
}else{
//else if it's not bigger then 0, then it's available '
//and we send 1 to the ajax request
echo 1;
}
?>
<script src="jquery-1.8.1.min.js" type="text/javascript"></script>
<SCRIPT LANGUAGE="JAVASCRIPT" TYPE="TEXT/JAVASCRIPT">
$(document).ready(function() {
var checking_html = 'Checking...';
//when button is clicked
$('#check_username_availability').click(function(){
//run the character number check
if($('#username').val().length < min_chars){
$('#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("check_username.php", { username: username },
function(result){
//if the result is 1
if(result == 1){
//show that the username is available
$('#username_availability_result').html(username + ' is Available');
}else{
//show that the username is NOT available
$('#username_availability_result').html(username + ' is not Available');
}
});
}
</script>
Hi everyone, So i'm trying to make a form that will validate if there is a username avaliable in my database. I've kinda of used javascript before, but I haven't done a lot with Ajax and JQuery. I keep getting this error message in the console that says
ReferenceError: Can't find variable: $
which responds to this line of script
$(document).ready(function() {
I'm not really sure why, and I was just wondering if anyone can give me some insight on how to fix it? thank you.
