Web Development

a.id = "my_anchor";

function OnChangedUsername()<br />
{<br />
if(document.Form1.newuserid.value == "")<br />
{<br />
//document.Form1.btnCheckAvailability.disabled = true;<br />
}<br />
else<br />
{<br />
//document.Form1.btnCheckAvailability.disabled = false;<br />
}<br />
}<br />
<br />
function OnCheckAvailability()<br />
{<br />
if(window.XMLHttpRequest)<br />
{<br />
oRequest = new XMLHttpRequest();<br />
}<br />
else if(window.ActiveXObject)<br />
{<br />
oRequest = new ActiveXObject("Microsoft.XMLHTTP");<br />
}<br />
<br />
//oRequest.open("POST", "Avablity.aspx?strUsername=" + document.Form1.newuserid.value, true);<br />
oRequest.open("POST", "ProcessRequest.aspx", true);<br />
oRequest.onreadystatechange = UpdateCheckAvailability;<br />
<br />
oRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");<br />
//var name=document.Form1.newuserid.value;<br />
<br />
oRequest.send("strCmd=availability&strUsername=" + document.Form1.newuserid.value);<br />
}<br />
<br />
function UpdateCheckAvailability()<br />
{<br />
if(oRequest.readyState == 4)<br />
{<br />
if(oRequest.status == 200)<br />
{<br />
var msg= new Boolean();<br />
 //var msg = new String(oRequest.responseText);<br />
alert(oRequest.responseText);<br />
//var msg=oRequest.responseText<br />
var label=document.getElementById("lblMessage");<br />
if (oRequest.responseText=='False')<br />
{<br />
alert("not");<br />
 label.innerHTML = 'NotAvailable';<br />
 label.style.color='Red';<br />
 }<br />
 else if (oRequest.responseText=='True')<br />
 {<br />
 alert("available");<br />
 label.innerHTML = 'Available';<br />
 label.style.color='Green';<br />
 }<br />
//document.getElementById("Result").innerHTML = unescape(oRequest.responseText);<br />
//document.getElementById("Result").innerHTML = msg;<br />
}<br />
else<br />
{<br />
document.getElementById("Result").innerHTML = "Asychronous Error";<br />
//var msg=document.getElementById("lblMessage");<br />
 //msg.innerHTML = oRequest.responseText;<br />
}<br />
}<br />
}<br />

 Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load<br />
        'Put user code to initialize the page here<br />
        i = Request.Form("strUsername")<br />
        'i = Request.QueryString("q")<br />
        j = Request.Form("strCmd")<br />
        'i = Request.QueryString("value")<br />
        If i = Nothing Then<br />
        Else<br />
            IsUsernameAvailable(i)<br />
        End If<br />
    End Sub<br />
<br />
Public Function IsUsernameAvailable(ByVal Username As String) As Boolean<br />
        Dim cn As SqlConnection<br />
        Dim cmd As SqlCommand<br />
        Dim dr As SqlDataReader<br />
        'Dim isAvailable As Boolean<br />
        Dim str As String<br />
        Dim flg As Byte<br />
        Try<br />
            cn = New SqlConnection("connection string.")<br />
            cn.Open()<br />
            str = "select count(*) from CheckUser where UserName='" & i & "'"<br />
            cmd = New SqlCommand(str, cn)<br />
            flg = cmd.ExecuteScalar<br />
            If flg = 1 Then<br />
                isAvailable = 0<br />
                Response.Write(isAvailable)<br />
                'Response.Write("NotAvailable")<br />
                'Response.End()<br />
            Else<br />
                'Response.Write("Available")<br />
                isAvailable = 1<br />
                Response.Write(isAvailable)<br />
                'Return True<br />
                'Response.End()<br />
            End If<br />
        Catch ex As Exception<br />
            Response.Write(ex.Message + ex.StackTrace)<br />
        Finally<br />
            cn.Close()<br />
        End Try<br />
    End Function<br />