I am trying to check if user is available
or not in the database
for that I have kept a button named " Check availability
".Once when user clicks that he can checks whether the name exists in the database or not and changes the textbox background color to red if "exists" and "green" if not
Now I have a registration page where the user fills the form if the user exists I need to disable the SignUp button
which I am using the " Image button
" for it.
So What happens is I am unable to disable it while the user is available. When I am disabling the Image button(ie..the SignUp button) during page load and after the user fills the form though the user is available the page is refreshing and submitting the information to the database as a duplicate field
.
And these are the many ways I have worked out but none worked out for me.
.enabled = true;
.disabled = false;
document.getElementById('<%= button.ClientID %>').disabled = true;
document.getElementById('<%= button.ClientID %>').disabled = false;
$('#ButtonId').prop("disabled", true); ->> disabled
$('#ButtonId').prop("disabled", false); ->> Enabled
Here is my code:
<script type="text/javascript">
$(function () {
$("#<% =btnavailable.ClientID %>").click(function () {
if ($("#<% =txtUserName.ClientID %>").val() == "") {
$("#<% =txtUserName.ClientID %>").removeClass().addClass('notavailablecss').text('Required field cannot be blank').fadeIn("slow");
} else {
$("#<% =txtUserName.ClientID %>").removeClass().addClass('messagebox').text('Checking...').fadeIn("slow");
$.post("LoginHandler.ashx", { uname: $("#<% =txtUserName.ClientID %>").val() }, function (result) {
if (result == "1") {
$("#<% =txtUserName.ClientID %>").addClass('notavailablecss').fadeTo(900, 1);
document.getElementById('<%= btnSignUp.ClientID %>').enabled = false;
}
else if (result == "0") {
$("#<% =txtUserName.ClientID %>").addClass('availablecss').fadeTo(900, 1);
document.getElementById('<%= btnSignUp.ClientID %>').enabled = true;
}
else {
$("#<% =txtUserName.ClientID %>").addClass('notavailablecss').fadeTo(900, 1);
}
});
}
});
$("#<% =btnavailable.ClientID %>").ajaxError(function (event, request, settings, error) {
alert("Error requesting page " + settings.url + " Error:" + error);
});
});
</script>
This is my handler code:
Public Class LoginHandler : Implements IHttpHandler
Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
Dim uname As String = context.Request("uname")
Dim result As String = "0"
If uname IsNot Nothing Then
result = CheckUnAvailable(uname)
End If
context.Response.Write(result)
context.Response.[End]()
End Sub
Public Function CheckUnAvailable(ByVal name As String) As String
Dim result As String = "0"
Dim con As New SqlConnection(ConfigurationManager.ConnectionStrings("HDIConnectionString").ConnectionString)
Try
con.Open()
Dim com As New SqlCommand("Select Username from Registration where Username=@UserName", con)
com.Parameters.AddWithValue("@UserName", name)
Dim uname As Object = com.ExecuteScalar()
If uname IsNot Nothing Then
result = "1"
End If
Catch
result = "error"
Finally
con.Close()
End Try
Return result
End Function
Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
Get
Return False
End Get
End Property
Updated Code for Check Availability Click:
If txtUserName.BackColor = Drawing.Color.Red Then
btnSignUp.Enabled = False
ElseIf txtUserName.BackColor = Drawing.Color.Green Then
btnSignUp.Enabled = True
End If
Try using: disabled=disabled
EDIT
Try: $('#ButtonId').removeProp("disabled");
If the button is an Asp.Net button:
$('#<%= button.ClientID %>').prop("disabled", true);
Or...
$("[id$=ButtonId]").prop("disabled", true);
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