Can AJAX calling a external webservices functions

Question

    <asp:ScriptManager ID="ScriptManager1" runat="server">
            <Services>
                <asp:ServiceReference Path="WebService.asmx" />
            </Services>
   </asp:ScriptManager> 
   <script type="text/javascript">
            WebService.GetUpdate("hhh",OnComplete, OnTimeout, OnError);
    </script>

this code is working fine, but when I change the Path to an external webservices, it give me an error, the class name is not defined. can someone help me out, thanks the changed one is

   <asp:ScriptManager ID="ScriptManager1" runat="server">
            <Services>
                <asp:ServiceReference Path="http://mysite/WebService.asmx" />
            </Services>
   </asp:ScriptManager> 
   <script type="text/javascript">
            WebService.GetUpdate("hhh",OnComplete, OnTimeout, OnError);
    </script>

Answer 1

You can only reference a web service in the same domain using the ServiceReference

Answer 2

You are trying to make a cross-domain call: you can’t make XMLHttpRequest calls from one domain to another.

Answer 3

Make a call to the local server, and have the server make the call to the external web service. This is allowed.

Answer 4

Rather than using Javascript to make cross-domain calls, if you can change the web service implementation, your can make the cross-domain calls in web service, then retrieve the result from your client.

With Javascript, as far as I know, some Javascript libraries (like dojo) have support for this. Below is a sample code snippet.

var callee = dojox.io.windowName.send("GET", {url:"http://xyz.com/data"});
callee.addCallback(function(data){
  console.log(data);
});

Answer 5

using the local webservice to call the external webservices and then use javascript to call the local function, then the problem solved