<asp:TextBox ID="txtRicercaDove" TextMode="SingleLine" runat="server"></asp:TextBox>

<!-- Typeahead -->
<script src="/js/moduli/typeahead/typeahead.bundle.js"></script>
<script src="/js/moduli/typeahead/handlebars-v3.0.0.js"></script>

<script type="text/javascript">
    var ricercaData = $(function() {

        $.ajax({
            url: '/Handler/myLoadData.ashx',
            data: { type: 'localita' },
            cache: false,
            async: false,
            dataType: 'json',
            type: 'POST',
            error: function (request, error) {

            },
            success: function (response) {
                return response;           
            }
        });
    });

    $('#<%= txtRicercaDove.ClientID %>').typeahead(null, {             
        displayKey: 'Localita.Default',
        source: ricercaData,
        templates: {
            empty: [            
            ].join('\n'),
            suggestion: Handlebars.compile('<p><strong>{{Localita.Default}}</strong> – {{Provincia}}</p>')
        }
    }); 
    
</script>
<!-- fine Typeahead -->