Autocomplete Functionality

$( ".full-name" ).autocomplete({
            source: function( request, response ) {
                $.ajax({
                    url: "autocomplete.php",
                    dataType: "json",
                    data: {
                        q: request.term
                    },
                    success: function( label, value ) {
                        response(label);
                    }
                });
            },
            minLength: 3,
            select: function( event, ui ) {
                $(".full-name").val($(event.target).find("span").text());
            },
            focus: function( event, ui ) {
                $(".full-name").val($(event.target).find("span").text());
                $('.full-name').autocomplete('close');
            },
            open: function() {
                $( this ).removeClass( "ui-corner-all" ).addClass( "ui-corner-top" );
                $('.ui-autocomplete').off('menufocus hover mouseover mouseenter');
            },
            close: function() {
                $( this ).removeClass( "ui-corner-top" ).addClass( "ui-corner-all" );
            }
        })
        .autocomplete( "instance" )._renderItem = function( ul, item ) {
                return $( "<li></li>" )
                    .data( "item.autocomplete", item )
                    .attr( "data-value", item.value )
                    .append(item.label)
                    .appendTo( ul );
            };