How to suggest available username 

Step 1 : Modify RegistrationService.asmx.cs as shown below. 
 
using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.Script.Serialization;
using System.Web.Services;
 
namespace Demo
{
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
 
    [System.Web.Script.Services.ScriptService]
    public class RegistrationService : System.Web.Services.WebService
    {
        public bool UserNameExists(string userName)
        {
            string cs = ConfigurationManager.ConnectionStrings["DBCS"].ConnectionString;
            using (SqlConnection con = new SqlConnection(cs))
            {
                SqlCommand cmd = new SqlCommand("spUserNameExists", con);
                cmd.CommandType = CommandType.StoredProcedure;
 
                cmd.Parameters.Add(new SqlParameter()
                {
                    ParameterName = "@UserName",
                    Value = userName
                });
 
                con.Open();
                return Convert.ToBoolean(cmd.ExecuteScalar());
            }
        }
 
        [WebMethod]
        public void GetAvailableUserName(string userName)
        {
            Registration regsitration = new Registration();
            regsitration.UserNameInUse = false;
 
            while (UserNameExists(userName))
            {
                Random random = new Random();
                int randomNumber = random.Next(1, 100);
                userName = userName + randomNumber.ToString();
                regsitration.UserNameInUse = true;
            }
 
            regsitration.UserName = userName;
            JavaScriptSerializer js = new JavaScriptSerializer();
            Context.Response.Write(js.Serialize(regsitration));
        }
    }
}
 
Step 2 : Modify the HTML and jQuery code in HtmlPage1.html as shown below.
 
<html>
<head>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('#txtUserName').keyup(function () {
                var userName = $(this).val();
                if (userName.length >= 3) {
                    $.ajax({
                        url: 'RegistrationService.asmx/GetAvailableUserName',
                        method: 'post',
                        data: { userName: userName },
                        dataType: 'json',
                        success: function (data) {
                            var divElement = $('#divOutput');
                            var spanElement = $('#spanAvailableUserName');
                            var linkElement = $('#linkAvailableUserName');
 
                            if (data.UserNameInUse) {
                                divElement.text(userName + ' already in use. Try another?');
                                divElement.css('color', 'red');
                                spanElement.text('Available :');
                                linkElement.text(data.UserName).click(function () {
                                    $('#txtUserName').val($(this).text());
                                    divElement.text('');
                                    spanElement.text('');
                                    linkElement.text('');
                                });
                            }
                            else {
                                divElement.text(data.UserName + ' available')
                                divElement.css('color', 'green');
                                spanElement.text('');
                                linkElement.text('');
                            }
                        },
                        error: function (err) {
                            alert(err);
                        }
                    });
                }
            });
        });
    </script>
</head>
<body style="font-family:Arial">
    <table>
        <tr>
            <td>
                UserName :
            </td>
            <td>
                <input id="txtUserName" type="text" />
            </td>
        </tr>
        <tr>
            <td></td>
            <td>
                <div id="divOutput"></div>
                <span id="spanAvailableUserName"></span>
                <a id="linkAvailableUserName" href="#"></a>
            </td>
        </tr>
    </table>
</body>
</html>

Comments

Post a Comment

Popular posts from this blog

Automatically send Birthday email using C#.Net

In order to automatically send Birthday email daily at particular time, a Windows Service will be created which will run daily at the particular time and will automatically send Birthday emails using C#.Net. In this article the Windows Service will execute a Task daily at a specific time. The Task is to fetch all records of Students who have a Birthday today. Such students will receive an email containing Birthday wishes automatically by the Windows Service. Config:- < appSettings >     < add  key  = " Mode "  value  = " Daily "  />     < add  key  = " IntervalMinutes "  value  = " 1 "  />     < add  key  = " ScheduledTime "  value  = " 17:43 "  /> </ appSettings > < connectionStrings >     < add  name = " constr "  connectionString = " Data Source=.\SQL2008R2;Initial Catalog=S...
Read more

Drag and Drop multiple File upload using jQuery AJAX in ASP.Net using C# and VB.Net

Multiple files such as Image, PDF, Word, Excel, etc. and also large Music and Video files such as MP3 and MP4 will be easily uploaded by simple Drag and Drop of files in HTML5 supported browsers using jQuery and AJAX in ASP.Net. This article makes use of the jQuery FileDrop plugin which makes use of Generic HTTP Handlers for uploading files with Drag and Drop using jQuery and AJAX in ASP.Net. In this article I will explain with an example, how to upload multiple files with Drag and Drop in HTML5 supported browsers using jQuery and AJAX in ASP.Net using C# and VB.Net. Multiple files such as Image, PDF, Word, Excel, etc. and also large Music and Video files such as MP3 and MP4 will be easily uploaded by simple Drag and Drop of files in HTML5 supported browsers using jQuery and AJAX in ASP.Net. This article makes use of the  jQuery FileDrop  plugin which makes use of Generic HTTP Handlers for uploading files with Drag and Drop using jQuery and AJAX in ASP.Net.  ...
Read more

Difference between each and map in jquery

Image
$.map $.each map method can be used as an iterator. each method is an immutable iterator Returns a new array Returns the original array The order of callback arguments - element, index. $.map(elems,  function  () { element, index }, arg) The order of callback arguments - index, element. $.each(elems,  function  () { index, element }, arg) Does not have a way to terminate the iteration Return false to terminate the iteration Example :  Notice that the callback arguments in the each method are the reverse of the callback arguments in the map function. Also notice that map returns a new array where as each method returns the original array. This proves the point that each method is an immutable iterator where as map is not. $(document).ready( function  () {      var  intArray = [1, 2, 3, 4, 5];      function  functionA(index, element) {          return ...
Read more