php - javascript phone validataion -

<?php //include db connection include("includes/config.php"); //include header include("includes/header.php"); ?> <?php //checks if form submitted if(isset($_post['submit'])) {     //get form values when submitted     $name=$_post['name'];     $email=$_post['email'];     $phone=$_post['phone'];     $password=$_post['password'];     $subject=$_post['subject'];     $target_dir = "uploads/";     $target_file = $target_dir . time() . basename($_files["file"]["name"]);      if (move_uploaded_file($_files["file"]["tmp_name"], $target_file))      {          mysql_query("insert `login`(`name`,`email`,`phone`,`password`,`file`,`subject`)values('$name','$email','$phone','$password',             '$target_file','$subject')");          echo "the file ". basename( $_files["file"]["name"]). " has been uploaded.";     }      else {         echo "sorry, there error uploading file.";     } } ?>  <div class="form"> <form action="" method="post" name="registration" enctype="multipart/form-data" onsubmit="return formvalidation();">     <table width="500" border="1" cellspacing="0" cellpadding="0" class="table">       <tr>         <td>name</td>         <td><input name="name" type="text" class="input" placeholder="please enter name" value="<?php //echo $username ;?>" /></td>       </tr>       <tr>         <td>email</td>         <td><input name="email" type="email" class="input" placeholder="please enter email id "value=" <?php //echo $useremail ;?>"  /></td>       </tr>       <tr>       <td>phone</td>         <td><input name="phone" type="text"  class="input" placeholder="please enter phone  number" value="<?php //echo $userphone;?>" /></td>       </tr>       <tr>         <td>password</td>         <td><input name="password" type="password" class="input" value="" /></td>       </tr>       <tr>         <td>upload file</td>         <td><input name="file" type="file" class="input" value="" </td>          </tr>        <tr>       <td>subject</td>          <td><textarea name="subject" cols="" rows="" class="input" placeholder="please enter query "/> <?php //echo $usersubject;?></textarea></td>       </tr>         <tr>       <td></td>       <td><input name="submit" type="submit" value="submit" /></td>       </tr>           </table> </form>      </div>  <?php //include footer include("includes/footer.php"); ?>  <script type="text/javascript"> function formvalidation()   {        var uname = document.registration.name;      var uphone= document.registration.phone;     if(allletter(uname))       {         if(phonenumber(uphone))           {         }     }     return false; }  function allletter(uname)   {         var letters = /^[a-za-z]+$/;       if(uname.value.match(letters))       {            return true;       }       else       {           alert('username must have alphabet characters only');           uname.focus();           return false;       }   }   function phonenumber(inputtxt)   {       var phoneno = /^\d{10}$/;       if((inputtxt.value.match(phoneno))       {         return true;       }      else     {           alert("message");           return false;       }   }   </script> 

for user name code validation works phone validation it's not working,i want phone validation empty field check , format check , email check.help me out i'm new javascript

try code.

function formvalidation()     {     var phone=document.forms["registration"]["phone"].value;     var phone_num = /^\d{10}$/;           if (phone=="")         {             alert("enter phone number");             return false;         }         else if(phone)          {             if(!phone_num.test(phone))          {            alert("not valid phone number");            return false;         }         }         var email = document.forms["registration"]["email"].value;         if (email=="")             {                 alert("enter email id");                 return false;             }         var atpos = email.indexof("@");         var dotpos = email.lastindexof(".");         if (atpos<1 || dotpos<atpos+2 || dotpos+2>=email.length)         {             alert("not valid e-mail address");             return false;         }     }