java script to validate combobox

have to validate my web page using java script. I have one dropdown
list also . I need a javascript to validate weather any item in
dropdownlist is selected or not. e.g ddlDrop is my dropdownlist.

To validate other controls I am using following
function validate()
{
if (document.getElementById("<%=txtUserName.ClientID% >").value=="")
{
alert("Please Pprovide UserName");
document.getElementById("<%=txtUserName.ClientID%> ").focus();
return false;
}
if (document.getElementById("<%=txtPassword.ClientID% >").value=="")
{
alert("Please provide Password");
document.getElementById("<%=txtPassword.ClientID%> ").focus();
return false;
}

bbawa1@yahoo.com

A drop down list must always have something selected, so usually you make
the first item in the list say something like --- Please Choose From
Below --- and then check to see if the first item is still selected at the
time of submission:

if(ddlDrop.selectedIndex == 0)
{
//No item was selected
}
else
{
//Something other than item 1 was selected
}

Also, in your other code (below), there is no need to refer to your controls
via:

document.getElementById("<%=txtUserName.ClientID%> ").value

just write:

txtUserName.value

-Scott


<> wrote in message
news: oups.com...
> have to validate my web page using java script. I have one dropdown
> list also . I need a javascript to validate weather any item in
> dropdownlist is selected or not. e.g ddlDrop is my dropdownlist.
>
> To validate other controls I am using following
> function validate()
> {
> if (document.getElementById("<%=txtUserName.ClientID% >").value=="")
> {
> alert("Please Pprovide UserName");
> document.getElementById("<%=txtUserName.ClientID%> ").focus();
> return false;
> }
> if (document.getElementById("<%=txtPassword.ClientID% >").value=="")
> {
> alert("Please provide Password");
> document.getElementById("<%=txtPassword.ClientID%> ").focus();
> return false;
> }
>

<> wrote in message
news: oups.com...

> have to validate my web page using java script. I have one dropdown
> list also . I need a javascript to validate weather any item in
> dropdownlist is selected or not. e.g ddlDrop is my dropdownlist.

Assuming you have a blank option as the first option in the DropDownList:

if(document.getElementById('<%=ddlDrop.ClientID%>' ).selectedIndex == 0)
{
alert("Please Pprovide DropDown");
document.getElementById("<%=ddlDrop.ClientID%>").f ocus();
return false;
}



--
http://www.markrae.net