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The CSS class to apply to the input box while results are being fetched from the server. The default is ac_loading. The character used to separate the results. The default is \n. The minimum number of characters before sending a request to the server. The default is 1. The delay after typing when the request will be sent. The default is 400 ms.

Another significant threat that e-commerce and financial institutions face are DoS attacks. In one type of DoS attack, the attacker sends so many packets to a web site that it cannot service the legitimate users that are trying access it. A financial institution or e-commerce site can end up losing money and revenue as the result of such a DoS attack because its customers will not be able to conduct transactions or make online purchases.

You will begin this chapter by learning how to create a pop-up menu. A pop-up menu is a GtkMenu widget that is displayed to the user when the right mouse button is clicked while hovering above certain widgets. Some widgets, such as GtkEntry and GtkTextView, already have pop-up menus built into the widget by default. If you want to change the pop-up menu of a widget that offers one by default, you should edit the supplied GtkMenu widget in the pop-up callback function. For example, both GtkEntry and GtkTextView have a populate-popup signal, which receives the GtkMenu that is going to be displayed. You can edit this menu in any way you see fit before displaying it to the user.

To set these options, include them in a dictionary as the second argument to the autocomplete method, as shown in listing 27.4.

For most widgets, you will need to create your own pop-up menu. In this section, you are going to learn how to supply a pop-up menu to a GtkProgressBar widget. The pop-up menu we are going to implement is presented in Figure 9-1.

<script src="../../Scripts/jquery-1.4.1.js" type="text/javascript"></script> <script src="../../Scripts/jquery.autocomplete.js" type="text/javascript"></script> <script type="text/javascript"> $(document).ready(function() { $("input#city").autocomplete( '<%= Url.Action("Find", "City") %>', { minChars : 3, delay : 300 }); }); </script>

In 2005 and 2006 alone, there were several incidents in which major organizations with reputable brands had significant amounts of sensitive data lost or stolen Bank of America, ChoicePoint, and the Veteran s Administration (VA) were among them A list of data breaches since 2005 is available on the Privacy Rights Clearinghouse web page (wwwprivacyrights org/ar/ChronDataBreacheshtm) In Bank of America s case, backup data tapes with sensitive information for over one million customers were lost as they were being transported from one location to another (CNN/Money 2005; Lemos 2005) Bank of America provided one year of free credit monitoring services to all affected customers.

Figure 9-1. A simple pop-up menu with three menu items The three pop-up menu items are used to pulse the progress bar, set it as 100 percent complete, and clear it. You will notice that, in Listing 9-1, an event box contains the progress bar. Because GtkProgressBar, like GtkLabel, is not able to detect GDK events by itself, we need to catch button-press-event signals using an event box. Listing 9-1. Simple Pop-up Menu (popupmenus.c) #include <gtk/gtk.h> static static static static static void create_popup_menu (GtkWidget*, GtkWidget*); void pulse_activated (GtkMenuItem*, GtkProgressBar*); void clear_activated (GtkMenuItem*, GtkProgressBar*); void fill_activated (GtkMenuItem*, GtkProgressBar*); gboolean button_press_event (GtkWidget*, GdkEventButton*, GtkWidget*);

This type of functionality is immensely useful for selecting from large lists. It keeps our initial page size down by not loading all these items at once, and it s user-friendly. Every scenario is unique, so be sure to tune the delay to match the nature of the data. This will ensure that the number of requests back to the server is kept to a manageable level.

int main (int argc, char *argv[]) { GtkWidget *window, *progress, *eventbox, *menu; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Pop-up Menus"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 250, -1);