March 2006
Beginner to intermediate
448 pages
13h 33m
English
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you’re on your way 4
7
next generation applications
“Reloads? We don’t need no stinking reloads.”
There’s nothing more annoying than an application that redraws the whole
page everytime you push a button or type in a value. In Katie’s report, only a
few numbers are changing, but the entire page has to be redrawn.
First, let’s gure out why all that reloading is going on...
HTML
Response
HTML
Response
Reload!
Reload!
Request Updated
Board Sales
Request Updated
Board Sales
The browser loads the
page that the server
sends back, and shows it
on the screen.
More reloading... every time
you want new board sales
totals, you gotta suffer
through a page reload.
The server gets a
request for the number
of boards sold...
...and sends back
the number of
boards sold, along
with the updated
prot, wrapped up
in a completely new
HTML page.
All this just so a
couple of numbers
can change...
Katie clicks this
button to get
updated totals.
Katie clicks
the button
again, to see
if any more
boards have
been sold.