- Here this is the program for username validation in PHP.
- If user entered name which is already exists then it will display error message.
- Here is the code for that program.
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<html> <script language="javascript"> //Ajax Code function inputcheck(str) { if(str=="") { document.getElementById("inputcheck").innerHTML==""; return; } if(window.XMLHttpRequest) { xmlhttp= new XMLHttpRequest(); } else { xmlhttp= new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if(xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("inputcheck").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","logcheck.php?check="+str,true); xmlhttp.send(); } //Fiished </script> <body> Enter UserName <input type="text" name="txtuser" onblur="inputcheck(this.value)" /> <span id="inputcheck"></span> </body> </html> <?php ?>The Database validation File Code. This code check the table for username which is entered by user. if username already exist it will display error.<?php $re=$_GET['check']; $con=mysql_connect("localhost","root",""); mysql_select_db("demo12"); $qu="select * from demo where username='$re'"; $res=mysql_query($qu); if(mysql_num_rows($res)==1) { echo '<p align=justify>Alredy Exits<p>'; } else { echo 'Thank You'; } ?>
Tags
check email availability using ajax php
check username availability using ajax and javascript php
email already exist validation in ajax laravel
username validation in jquery
If you want to develop new PHP project, I suggest you using MySQLi, because your php code soon will be deprecated. You can perform something like this:
ReplyDelete$db = new Db();
$sql = $db->query("select * from demo where username='$re'");
if($sql->num_rows) {
echo '<p align=justify>Alredy Exits<p>';
}
else {
echo 'Thank You';
}
Yes from now our all code will be on mysqli.
DeleteThanks.