input value blank in jquery on button click

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hi
i want to show value inside textbox and not a label

Everybody shows like

Username : <input type="text" name="loginhere" />

I want to show like

<input type="text" name="loginhere" value="Username" />

when input clicked , the value show disappear , and when input not clicked, and button clicked,
check in jquery if value entered, else show alert

Posted 16-Jan-14 17:39pm

maulikshah1990

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Sandeep Singh Shekhawat · Accepted Answer · 2014-01-16T18:13:00

you can do it using HTML5 and jQuery. Please check following code

HTML

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm2.aspx.cs" Inherits="WebApplication2.WebForm2" EnableViewState="false" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
   <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
   <script type="text/javascript">
       function CheckValue() {
           var userName = $("#userName").val();
           if (userName == '')
           {
               alert('user Name is empty');
           }
           else
           {
               alert(userName);
           }
       }
   </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <input type="text" id="userName" name="userName" placeholder="Username"><br>
     <asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClientClick="CheckValue()"  />
    </div>

    </form>
</body>
</html>