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    <p>One solution you can do is check as the autocomplete fills out. This is some sample code for filling out my text field.</p> <pre><code>$("#search").autocomplete({ source: function (request, response) { $.ajax({ url: "MyWebService.asmx/FetchUsers", data: "{ 'search': '" + request.term + "' }", dataType: "json", type: "POST", contentType: "application/json; charset=utf-8", dataFilter: function (data) { return data; }, success: function (data) { response($.map(data.d, function (item) { return { value: item } })) }, error: AjaxFailed }); }, minLength: 3 }); </code></pre> <p>So you can change the success to look like</p> <pre><code>success: function (data) { if (data.d.length == 0) alert('Does Not Exist'); else { response($.map(data.d, function (item) { return { value: item } })) } } </code></pre> <p>If you want to do it as they hit the click button, you can create a button and tie a javascript function to the onClick event to do a post to a webservice and check if the value exists so it'd be something along the lines of this:</p> <pre><code>&lt;asp:Button ID="Button1" runat="server" onclick="verifyFriendExists()"&gt;&lt;/asp:Button&gt; &lt;script type="text/javascript"&gt; function verifyFriendExists() { var user = $('#userbox').value; $.ajax({ type: "POST", url: "MyWebService.asmx/VerifyParticipant", data: "{'user': '" + user + "'}", contentType: "application/json; charset=utf-8", dataType: "json", success: function (msg) { if (msg.d != "Success") alert('Does Not Exist'); }, error: AjaxFailed }); } &lt;/script&gt; </code></pre> <p>And create a WebService with a method that's something like</p> <pre><code>[WebMethod] public String VerifyParticipant(string user) { bool userExists = CheckParticipant(user); if (userExists) return "Success"; else return "Does Not Exist"; } </code></pre> <p>I know that's a lot to look over. Let me know if I wasn't clear on something. Good luck!</p>
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    1. PONeed to call jQuery dialog (register user) on postback when non existing username is entered
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    1. USBen
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    1. COOnce again, I am using IIS6 with framework 2. Unfortunately, Webmethods arent exactly at my disposal sigh .. makes me even more sad :(
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      1. USBhrugesh Patel
    2. COWell here's a down and dirty way to force a message box from server side: `public void MsgBox(string message) { Response.Write("<script language=javascript>alert('" + message.Replace("'", "\'").Replace("\n", " ") + "');</script>"); }` It doesn't function as nicely as a traditional javascript alert() but it does work. Then you can just check from the server side and call that function if the user doesn't exist.
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    3. COchecking out with autocomplete? but autocomplete fires on each keypress. I need to pop up register user dialog form. I dont think it will be convenient for user if i pop up the form on each key press
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