JavaScript Examples
Basic
Write
text with JavaScript
Format
text with HTML tags
Where to put the JavaScript
JavaScript
in the head section
JavaScript
in the body section
An
external JavaScript
Variables
Declare
a variable, assign a value to it, and display it
String Object
Count
characters in a string (length() method)
Test
if a string contains a specified character (indexOf() method)
Test
if a string contains a specified character (match() method)
Return
a specified part of a string (substr() method)
Uppercase
or lowercase characters? (toLowerCase() and toUpperCase() methods)
Array Object
Make
an array that store names
Find
out how many elements an array contains
Date Object
Today's
date
Current
local time
Set
date
UTC
time
Display
current weekday
Display
a complete date with the name of the day and the name of the month
Running
clock
Math Object
Round
a number to the nearest whole number (round() method)
Random
number between 0 and 1 (random() method)
Random
number from 0-10 (random() method and round() method)
Test
which of two numbers, has the highest value (max() method)
Test
which of two numbers, has the lowest value (min() method)
Convert
Celsius to Fahrenheit
Convert
a character to Unicode
Window
Change
the text in the <title> tag of a document IE
only
Display
an alert box
Display
an alert box with line breaks
Disable
right-click IE only
Display
a confirm box
Display
a prompt box
Display
a new window
Specify
the look of the new window
Display
a new fullsize window IE only
Place
the new window
Close
a window
Open
multiple windows
Location
Press
a button to view source
Bookmark
page/Add to favorites IE only
Make
page default homepage IE only
Refresh
page
Change
text in the status bar
Print
page
When was
this file last modified?
Scroll
down
Scroll
right
Scrolling
effect
Image
Preload
an image
Frames
Break
out of a frame
Update
two frames
Update
two other frames
Update
two iframes IE only
Forms
Validate
an e-mail address
Validate
a value
Validate
a length of an input
Form
validation
Set
focus on an input field
Select
text in an input field
Radio
button
Checkbox
Select
from a dropdown list
Select
more than one option
Select
menu IE only
Set
focus on the next field when the current field's maxlength has been reached
Client info
Detect
the client's browser
More
details about the client
Detect
details about the client's monitor
Redirect
the user to different pages, depending on browser
Write
a different message to the user, depending on the browser
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