<form action="" method="post" name="formSet" id="formSet" autocomplete="off" enctype="multipart/form-data">
<!--filds here-->
</form>

submitHandler: function(form) {

  var formdata = new FormData(form);

  $.ajax({
    url: 'process.php',
    type: 'post',
    data: formdata,
    contentType: false,
    cache: false,
    processData: false,
    //dataType:'json',
    success: function(data) {
   <!--ajax response-->
    }
  });
}

$name=$conn->real_escape_string(trim($_POST["name"]));
        $email=$conn->real_escape_string(trim($_POST["email"]));
        $mobno=$conn->real_escape_string(trim($_POST["mobno"]));

        $target_dir = "assets/uploads/";
        $filename  = basename($_FILES['file']['name']);
        $extension = pathinfo($filename, PATHINFO_EXTENSION);
        $new1        = mt_rand();// random number
        $new       = $new1.'.'.$extension;

        $target_file = $target_dir . $new;
        $uploadOk = 1;
        $FileType = pathinfo($target_file,PATHINFO_EXTENSION);
        $filename = pathinfo($target_file, PATHINFO_FILENAME);



        if($name == "")
        {
            $errorMsg="Name field is required";
            $code="1";
        }
     elseif ($email =="")
        {
            $errorMsg="Email filed is required";
            $code="3";
        }
        elseif (!preg_match("/^[_.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z-]+.)+[a-zA-Z]{2,6}$/i", $email))
        {
            $errorMsg="Please enter valid email id";
            $code="3";
        }
        elseif ($mobno=="")
        {
            $errorMsg="Mobile number is required";
            $code="4";
        }
        elseif (is_numeric(trim($mobno))==false)
        {
            $errorMsg="Only contain a number";
            $code="4";
        }
        elseif (strlen($mobno)<10)
        {
            $errorMsg="Contain minimun 10 number ex:9892555555";
            $code="4";
        }
        elseif (strlen($mobno)>10)
        {
            $errorMsg="Contain maximum 10 number ex:9892555555";
            $code="4";
        }

        elseif (empty($_FILES['file']['name'][0]))

        {
            $errorMsg = 'You have not selected any image for uplaod field';
            $code="10";
        }

        elseif ($_FILES["file"]["size"] > 5000000) {
            $errorMsg="Sorry, your file is too large";
            $code="10";
            $uploadOk = 0;
        }
        // Allow certain file formats
        elseif($FileType != "doc" && $FileType != "docx" && $FileType != "pdf" && $FileType != "xls"
        && $FileType != "cvc" && $FileType != "txt" && $FileType != "png" && $FileType != "jpg" && $FileType != "jpeg") {
            $errorMsg="Sorry, only doc, pdf, xls, cvc,png,jpg,jpeg & txt files are allowed.";
            $code="10";
        }

        else
        {
            $query= "INSERT INTO `tbl_requestform` (name, email, ,mobileno, about_image) VALUES (?,?,?,?)";
            //echo "working";

                    if($stmt = $conn->prepare($query))
                        {
                        $stmt->bind_param("ssss", $name,$email,$mobno,$filename);
                        $stmt->execute();

                        if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
                                    $errorMsg="Data Inserted";
                                    $code="11";
                         }
                         else {
                         $code= "12";
                         $errorMsg[]='Sorry, there was an error uploading your file.';
                        }

                    }



    }
       $stmt->close();
       $conn->close();


            $response['error']=$errorMsg;
            $response['error_no']=$code;

            echo json_encode($response);