<script type="text/javascript">
function autoComplete1_OnClientShown(sender, eventArgs) {
var valueToSelect = $("#<%= TextBox1.ClientID %>").val();
if (valueToSelect.length > 0) {
var itemToSelect = $("li[_value^='" + valueToSelect + "']", ".CompletionList").get(0);
Sys.Debug.traceDump(itemToSelect);
if (itemToSelect)
$find("AutoCompleteEx")._setText(itemToSelect);
}
}
</script>
<asp:Label runat="server" AssociatedControlID="TextBox1" Text="Select the first value that starts with: " />
<asp:TextBox runat="server" ID="TextBox1" />
<br />
<asp:Label ID="Label1" runat="server" AssociatedControlID="TextBox2" Text="Choose value: " />
<asp:TextBox runat="server" ID="TextBox2" />
<ajax:AutoCompleteExtender runat="server"
BehaviorID="AutoCompleteEx"
ID="autoComplete1"
TargetControlID="TextBox2"
ServicePath="Default.aspx"
ServiceMethod="GetCompletionList"
MinimumPrefixLength="2"
DelimiterCharacters=";, :"
CompletionListCssClass="CompletionList"
OnClientShown="autoComplete1_OnClientShown"
ShowOnlyCurrentWordInCompletionListItem="false" >
</ajax:AutoCompleteExtender>