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Head Rush Ajax
book

Head Rush Ajax

by Brett McLaughlin
March 2006
Beginner to intermediate content levelBeginner to intermediate
448 pages
13h 33m
English
O'Reilly Media, Inc.
Content preview from Head Rush Ajax
180
Chapter 3
using substring in javascript
1Jim
0
1
2
3
Position:
myString.substring(1, 3);
myString
myString.substring(2, myString.length);
myString.substring(0, myString.length);
Ji
im
1Jim
You can use myString.length to get
the length of a string, which will
always be one greater than the
last position in the string.
4
myString.length
This substring will start at position
1, end at position 3, and not
include the character at position 3.
substring() practice
Let’s spend a little time practicing how to use the JavaScript substring()
method, using the string you saw on the last two pages.
JavaScript
PHP script
HTML form
This substring started at position 1
(“J”), and went to position (3 - 1),
which is position 2 (“i”).
Since myString.length will be 1 greater
than the last position, this will always
go to the end of a string.
Position 0 is the rst
character in the string...
...and myString.length will always
return to the end of the string.
This JavaScript would always
return the entire string.
you’re on your way 4
181
asynchronous applications
You should be ready to write the rest of the JavaScript for serveDrink() on
your own now. Below is part of that function’s JavaScript; your job is to ll in
the blanks and get things working.
You’ll need to get the response from the server, then break that response
int ...
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Publisher Resources

ISBN: 0596102259Errata PageSupplemental Content