Ajax with ASP.NET

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Dynamic HTML (DHTML) is a combination of three technologies: Hypertext Markup Language
(HTML), Cascading Style Sheets (CSS), and JavaScript. With these technologies, the content in a
browser becomes dynamic, not having to rely on time-consuming updates from round trips back
to the server. Additionally, finer control over the user experience is available by leveraging the
various events inherent in HTML, such as playing a small sound when the mouse moves over an
image or providing custom context menus instead of the standard one provided by the browser.
This chapter will introduce JavaScript, and then move into how it can interact with the browser
environment to modify the HTML and CSS that make up the web page being displayed. Colors,
images, text, and more can be modified, all through JavaScript code. In the next chapter, the
coverage dives deeper, analyzing the nature of objects and continuing into the Document Object
Model (DOM).
In this chapter, you take a look at:

JavaScript basics

The
alert
,
write
, and
loop
functions

Modifying the status bar

Getting input from the user with the
prompt()
function

JavaScript events

The
document.getElementById()
function

The
innerHTML
property
What JavaScript Is, and What It Isn't
In the realm of computer languages and programs, there are two major types: compiled and
interpreted.
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