HTML and CSS Reference
In-Depth Information
The XMLHttpRequest object lets your web page ask the
web server a question and get an immediate answer. It's
a one-for-one exchange—once the web server provides
its response, the interaction is over. There's no way for
the web server to wait a few minutes and send another
message with an update.
However, there are some types of web pages that could
use a longer-term web server relationship. For example,
think of a stock quote on Google Finance
( ) . When you leave that page
open on your desktop, you'll see regular price updates
appear automatically. Another example is a news ticker
like the one at . Linger here, and
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