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Setting a new value for a property is easily done with g_object_set(). In this example, the relief property of the button was set to GTK_RELIEF_NORMAL: g_object_set (button, "relief", GTK_RELIEF_NORMAL, NULL); Functions are provided to set and retrieve many of the properties of each widget. However, not every property has that option. These functions will become extremely important when you learn about the GtkTreeView widget in 8, because many objects used in that chapter do not provide get or set functions for any properties. It is also possible to monitor a specific property with GObject s notify signal. You can monitor a property by connecting to the notify::property-name signal. The example in Listing 2-4 calls property_changed() when the relief property is changed. Listing 2-4. Using the Notify Property g_signal_connect (G_OBJECT (button), "notify::relief", G_CALLBACK (property_changed), NULL); ... static void property_changed (GObject *button, GParamSpec *property, gpointer data) { /* Handle the property change ... */ }

com/products/jsp/docshtml) (Jorelid 2001) or ASP (Homer and Sussman 2003) Nevertheless, there have been attacks published against the session management functionality in some of these frameworks as well (Gutterman and Malkhi 2005) By storing authoritative state in a database and never giving the client access to it, you can thwart client-state manipulation attacks The downside of using a database is that your server-side infrastructure is no longer stateless Every time an HTTP request arrives at your web server, a database lookup needs to be done, and could turn the database into a performance bottleneck In addition, if the database lookup takes nontrivial computational resources, an attacker could issue many such requests with random session-ids as part of a DoS attack.

if(xhr.readyState != 4) return; document.getElementById('result') .innerHTML = xhr.responseText; }; xhr.send(null); } function getXmlHttpRequest() { var xhr; if(typeof ActiveXObject != 'undefined'){ try { xhr = new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) { xhr = new ActiveXObject("Microsoft.XMLHTTP"); } } else if(XMLHttpRequest) { xhr = new XMLHttpRequest(); } else { alert("Sorry, your browser doesn't support Ajax"); } return xhr; }

Caution While it is acceptable to use either a dash or an underscore when typing signal names, you must always use dashes when using the notify signal. For example, if you need to monitor GtkWidget s can-focus property, notify::can_focus is not acceptable! Remember that notify is the signal name, and can-focus is the name of the widget property.

Figure 12.1 The request is submitted asynchronously. Firebug (shown at the bottom of the browser window) allows us to inspect Ajax calls for better debugging.

The callback function receives a new type of object called GParamSpec, which holds information about the property that was changed. For now, all you need to know is that you can retrieve the name of the property that was changed with property->name. You will learn more about the GParamSpec structure in 11 when you learn how to add properties to your own custom widgets.

The server would be forced to look up each of the session-ids to determine if the request is from a legitimate user, but the act of doing the lookups could overload the server and prevent it from responding to legitimate clients To deal with this bottleneck, the database can be distributed and HTTP requests can be load balanced across distributed database servers..

Firebug, which is shown in figure 12.1, allows you to inspect Ajax calls; it s invaluable when doing Ajax development. You can get Firebug at http:// getfirebug.com/.

A tree model that holds the content that is filtered by GtkTreeModelFilter. A tree path that points to the root row to use in child-model. This does not have to be the absolute root path of the tree model.

You might notice throughout this chapter that we prefer unobtrusive JavaScript. This means that JavaScript is better added separately, not intermingled with HTML content. Additionally, it can mean that the functionality of the page degrades gracefully in the absence of JavaScript. We also adhere to common cross-browser JavaScript standards, such as document.getElementById('myDiv') rather than the nonstandard document. myDiv or others. Have you ever seen code that looks like this

A flag to place horizontal or vertical grid lines. If set to TRUE, the user will be able to search the content of GtkTreeView with the keyboard. If set to TRUE, lines will be drawn that define the hierarchy of the tree view content. The tree view column where the expander is displayed for tree views using GtkTreeStore.

We now outline another solution in which the server can continue to be stateless. In this solution, the authoritative state is returned to the client but to prevent a client from tampering with the state, a signature is also sent to the client with the transaction state. If the client attempts to alter the state, the signature will no longer match, and the server will disregard the

The href attribute is supposed to point to a document, not contain JavaScript code. Other times we see this: