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Other common controls We can see from our simple text box example that most ASP.NET Web Forms input controls have little to offer. But some controls have semifunctional rendered output. One example is the <asp:Menu /> control. It doesn t require postbacks if you specify a NavigateUrl for each of the MenuItems, and it doesn t require view state (though it does

Such password cracking programs can easily determine 10 to 20 percent of the usernames and passwords in a system Of course, to gain access to a system, an attacker typically needs only one valid username and password Passwords are relatively easy to crack, unless users are somehow forced to choose passwords that are hard for such password-cracking programs to guess A second disadvantage of password security systems is that a user needs to reuse a password each time she logs into a system that gives an attacker numerous opportunities to listen in (see Section 14) on that password If the attacker can successfully listen in on a password just once, the attacker can then log in as the user A one-time password (OTP) system, which forces the user to enter a new password each time she logs in, eliminates the risks of using a password multiple times.

his chapter will show you how to use the GtkScrolledWindow widget in combination with another powerful widget known as GtkTreeView. The tree view widget can be used to display data in lists or trees that span one or many columns. For example, a GtkTreeView can be used to implement a file browser or display the build the output of an integrated development environment. GtkTreeView is an involved widget, because it provides a wide variety of features, so be sure to carefully read through each section of this chapter. However, once you learn this powerful widget, you will be able to apply it in many applications. This chapter will introduce you to a large number of features provided by GtkTreeView. The information presented in this chapter will enable you to mold the tree view widget to meet your needs. Specifically, in this chapter, you will learn the following: What objects are used to create a GtkTreeView and how its model-view-controller design makes it unique How to create lists and tree structures with the GtkTreeView widget When to use GtkTreePath, GtkTreeIter, or GtkTreeRowReference to reference rows within a GtkTreeView How to handle double-clicks, single row selections, and multiple row selections How to create editable tree view cells or customize individual cells with cell renderer functions The widgets you can embed within a cell, including toggle buttons, pixbufs, spin buttons, combo boxes, progress bars, and keyboard accelerator strings

use it to store the last selected item). It simply renders HTML and JavaScript to allow elements to expand and hide on mouse events. Again, a server-side form tag is required and, unlike with the TextBox, you shouldn t remove it. Doing so will prevent the JavaScript that controls the hiding and showing of the items from being rendered. Also, Menu renders a nasty pile of HTML tables to display properly we ve come to expect this from Web Forms controls. We could choose to fix the poor markup with ASP.NET control adapters, Figure 7.3 The menu control renders okay in but the benefits would probably not be Firefox and IE. Unfortunately it depends on a serverworth the trouble. Figure 7.3 demonside form tag, and JavaScript surgery would be needed to make it function properly. WebKit-based strates the menu control working on an browsers (Chrome and Safari) have problems with MVC view. The rendered markup is the JavaScript used to pop open the menus. shown in figure 7.4. The <asp:Menu /> control renders, and the JavaScript open and close behavior functions properly (as long as you have a server-side form tag.) But the links without a NavigateUrl property depend on the postback model of Web Forms. We could conjure up some JavaScript to alter this behavior, but doing so would just add to the mess. Additionally, take a look at the rendered markup in figure 7.4. Hard-coded styles, deeply nested tables, and highly obtrusive JavaScript make this tiny menu render nothing short of a headache.