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So as you can see, the DOM provides a number of different methods for accessing the contents of a form In the next chapter, we will examine the ins and outs of browser events We will start off by looking at the different types of events in HTML and how to write event handlers to deal with them And we will look at some of the special cross-browser compatibility issues that arise when dealing with events
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Handle Browser Events
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Write JavaScript event handlers Handle events using the event property Trigger events in JavaScript Overcome browser incompatibility
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The dictionary defines an event as something that takes place and that is exactly what it means in web programming as well An event handler is JavaScript code that is designed to run each time a particular event occurs Of course, this means that your JavaScript code may execute dozens of times, or not at all, depending on the circumstances There are 18 events officially defined in the HTML 401 specification In addition, browsers that support the official DOM Level 2 Events specification need to provide several more events for programmers to work with However, Microsoft and Netscape have gone beyond the events listed in the official specifications and provide many more: IE supports more than 75 events, and Netscape supports at least 50 The DOM Level 2 Events specification can be found on the official W3C web site at http://wwww3org/TR/DOM-Level-2-Events The key to knowing how to write appropriate event handlers is understanding what the events are and when they occur For instance, the following events are just three of the official 18 HTML 401 events:
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load event Occurs when the HTML document has finished loading in the browser
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window
click event Occurs when the left mouse button has been clicked keypress event Occurs when a keyboard key has been pressed
JavaScript can be used to intercept these events when they occur and take certain actions (sometimes it is allowed to cancel the event) Intercepting an event is called capturing the event, and it is done by writing event handler code If no event handling code is written, the browser will continue to process the event as normal using default behavior In this chapter, we will examine the various events provided by most HTML elements and how event handlers should be written for each We will also see how a JavaScript program can cause these events to occur manually, and we ll look into the differences in event handling between the various browsers
Write JavaScript Event Handlers
You saw some examples of event handlers in the previous chapter, in the Catch Web Form Submissions with onsubmit section Writing an onsubmit event handler enabled our JavaScript program to check that all the fields on a form were filled out before the form submission was allowed to continue
CHAPTER 9: Handle Browser Events
Events fall into four major categories:
User interface events Mouse events Key events HTML events
User interface events happen as controls or other objects on a web page gain and lose focus These events are often caused by other user actions (such as a tab key press or a mouse click), but they can happen programmatically as well Mouse events occur when the user moves the mouse or presses one of the mouse buttons These events allow a web page to respond to mouse movements by, for example, highlighting an image when the mouse moves over it Key events occur when the user presses and/or releases one of the keyboard keys Only certain HTML elements can capture keyboard events, as we will see later in this chapter Finally, there are several events specific to certain HTML elements They often relate to the browser window itself or to form controls and other objects embedded in a web page The onsubmit event handler discussed in the last chapter falls into this category
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