username already exists validation in jquery – jQuery Validate remote method usage to check if username already exists. Generally we need to check if a username or email already exists or not. I want to validate if username exists in database using jQuery.
username already exists validation in jquery
jQuery Validate remote method usage to check if username already exists. Check $_POST[‘membername’] value in members table. If username exists then return Available.
Fields | Type |
---|---|
id | INT(11) |
membername | VARCHAR(255) |
VARCHAR(255) | |
memberPass | VARCHAR(255) |
Check if user already exists without submitting form
Step 1: signup.php
signup
Step 2: styles.css
body { background: #A9D9C3; } #signup_form h1 { text-align: center; } #signup_form { width: 37%; margin: 100px auto; padding-bottom: 30px; border: 1px solid #918274; border-radius: 5px; background: white; } #signup_form input { width: 80%; height: 35px; margin: 5px 10%; font-size: 1.1em; padding: 4px; font-size: .9em; } #reg_btn { height: 35px; width: 80%; margin: 5px 10%; color: white; background: #3B5998; border: none; border-radius: 5px; } /*Styling for errors on form*/ .form_error span { width: 80%; height: 35px; margin: 3px 10%; font-size: 1.1em; color: #D83D5A; } .form_error input { border: 1px solid #D83D5A; } /*Styling in case no errors on form*/ .form_success span { width: 80%; height: 35px; margin: 3px 10%; font-size: 1.1em; color: green; } .form_success input { border: 1px solid green; } #error_msg { color: red; text-align: center; margin: 10px auto; }
Step 3:script.js
$('document').ready(function(){ var membername_state = false; var email_state = false; $('#membername').on('blur', function(){ var membername = $('#membername').val(); if (membername == '') { membername_state = false; return; } $.ajax({ url: 'signup.php', type: 'post', data: { 'membername_check' : 1, 'membername' : membername, }, success: function(response){ if (response == 'taken' ) { membername_state = false; $('#membername').parent().removeClass(); $('#membername').parent().addClass("form_error"); $('#membername').siblings("span").text('Sorry... membername already taken'); }else if (response == 'not_taken') { membername_state = true; $('#membername').parent().removeClass(); $('#membername').parent().addClass("form_success"); $('#membername').siblings("span").text('membername available'); } } }); }); $('#email').on('blur', function(){ var email = $('#email').val(); if (email == '') { email_state = false; return; } $.ajax({ url: 'signup.php', type: 'post', data: { 'email_check' : 1, 'email' : email, }, success: function(response){ if (response == 'taken' ) { email_state = false; $('#email').parent().removeClass(); $('#email').parent().addClass("form_error"); $('#email').siblings("span").text('Sorry... Email already taken'); }else if (response == 'not_taken') { email_state = true; $('#email').parent().removeClass(); $('#email').parent().addClass("form_success"); $('#email').siblings("span").text('Email available'); } } }); }); $('#reg_btn').on('click', function(){ var membername = $('#membername').val(); var email = $('#email').val(); var memberPass = $('#memberPass').val(); if (membername_state == false || email_state == false) { $('#error_msg').text('Fix the errors in the form first'); }else{ // proceed with form submission $.ajax({ url: 'signup.php', type: 'post', data: { 'save' : 1, 'email' : email, 'membername' : membername, 'memberPass' : memberPass, }, success: function(response){ alert('member saved'); $('#membername').val(''); $('#email').val(''); $('#memberPass').val(''); } }); } }); });
Don’t Miss : How To Check Email Already Exist In Database In Php
Step 4: process.php
0) { echo "pakainfo_v1"; }else{ echo 'not_taken'; } exit(); } if (isset($_POST['email_check'])) { $email = $_POST['email']; $query = "SELECT * FROM members WHERE email='$email'"; $output = mysqli_query($db, $query); if (mysqli_num_rows($output) > 0) { echo "pakainfo_v1"; }else{ echo 'not_taken'; } exit(); } if (isset($_POST['save'])) { $membername = $_POST['membername']; $email = $_POST['email']; $memberPass = $_POST['memberPass']; $query = "SELECT * FROM members WHERE membername='$membername'"; $output = mysqli_query($db, $query); if (mysqli_num_rows($output) > 0) { echo "exists"; exit(); }else{ $query = "INSERT INTO members (membername, email, memberPass) VALUES ('$membername', '$email', '".md5($memberPass)."')"; $output = mysqli_query($db, $query); echo 'Saved!'; exit(); } } ?>
Example 2: Check username availability using PHP and jQuery
To check the availability of a username using PHP and jQuery, you can use AJAX to send a request to a PHP script that checks the database for the username. Here’s an example:
Create a form that includes an input field for the username and a div to display the availability message:
Include jQuery and create a function to send an AJAX request when the username input changes:
Create a PHP script (check_username.php) that checks the database for the username and returns a response indicating whether the username is available:
0) { echo "Username not available"; } else { echo "Username available"; } // Close database connection mysqli_close($conn); ?>
In this example, we’re using mysqli to connect to the database and query the users table for the username. If the username is found, we’re returning a message indicating that the username is not available. If the username is not found, we’re returning a message indicating that the username is available. Note that this is a simple example and you should implement proper security measures (such as sanitizing user input and using prepared statements) to protect against SQL injection attacks.
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