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Finally, let me point out that you can define your own value types that overload the various operators mentioned above . I discuss how to do this in the Operator Overload Methods section in 8, Methods . If you then use a nullable instance of your own value type, the compiler does the right thing and invokes your overloaded operator . For example, suppose that you have a Point value type that defines overloads for the == and != operators as follows:

Note that this code uses the .click() method to define a binding to the validateEmpId JavaScript function. The .click() method is a shortcut. You could also call .bind("click", "validateEmpId"). The code inside validateEmpId might also use jQuery to find the user s input, validate it, and then set an appropriate message on the page. Of course, if the ID is valid, you would also want to reach out to the server for the search results; you will look at this in Implementing AJAX with jQuery, later in this lesson. The following shows a version of the validateEmpId client-script.

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using System; internal struct Point { private Int32 m_x, m_y; public Point(Int32 x, Int32 y) { m_x = x; m_y = y; } public static Boolean operator==(Point p1, Point p2) { return (p1.m_x == p2.m_x) && (p1.m_y == p2.m_y); } public static Boolean operator!=(Point p1, Point p2) { return !(p1 == p2); } }

function validateEmpId() { var empId = $("#MainContent_TextBoxEmpId").val(); if (empId.length < 8 || empId.length > 10) { $("#msgValidEmpId").text("* Invalid Employee ID"); } else { $("#msgValidEmpId").text("*"); /// call back to server ... } }

At this point, you can use nullable instances of the Point type and the compiler will invoke your overloaded operators:

Figure 9-9 shows the page running in a browser. Notice the message displayed next to the text box. This is displayed after the search button click.

internal static class public static void Point p1 = new Point p2 = new Program { Main() { Point(1, 1); Point(2, 2);

The jQuery library provides many events to which you can bind. These include events related to input tags (such as button), page-level actions, and user input events. You can trap these events and respond accordingly to make your page more interactive. All element events can be bound by using the .bind("event", handler) syntax. jQuery also provides shortcut methods based on event names (such as click). You use these shortcut methods to directly bind to an event without the use of the .bind() method. These all work in a similar manner: you indicate the event name as the method name and pass a function pointer to it. Table 9-5 lists some event methods you can use to bind to found elements.

Console.WriteLine("Are points equal " + (p1 == p2).ToString()); Console.WriteLine("Are points not equal " + (p1 != p2).ToString()); } }

.blur() .click(), .dblclick() .error() .focus(), .focusin(), .focusout()

When I build and run the code above, I get the following output:

Bind to this event to execute code when an element loses focuses. Bind to these events to execute code when a user clicks or double-clicks on a specified element. Bind to this event to trap element errors such as a broken link or a missing image. Bind to the .focus() event to execute code when an element receives focus. The .focusin() event will be triggered for child elements when a parent element receives focus. The .focusout() event triggers when focus is lost by an element or its parent.

C# has an operator called the null-coalescing operator ( ), which takes two operands . If the operand on the left is not null, the operand s value is returned . If the operand on the left is null, the value of the right operand is returned . The null-coalescing operator offers a very convenient way to set a variable s default value . A cool feature of the null-coalescing operator is that it can be used with reference types as well as nullable value types . Here is some code that demonstrates the use of the nullcoalescing operator:

.hover() .keydown(), .keyup(), .keypress() .mousedown(), .mouseup(), .mouseenter(), .mouseleave(), .mouseout(), .mouseover(), .mousemove() .load(), .unload() .resize() .scroll() .select() .unbind()

private static void NullCoalescingOperator() { Int32 b = null; // The line below is equivalent to: // x = (b.HasValue) b.Value : 123 Int32 x = b 123; Console.WriteLine(x); // "123" // The line below is equivalent to: // String temp = GetFilename(); // filename = (temp != null) temp : "Untitled"; String filename = GetFilename() "Untitled"; }

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