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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
Functions
Function
Function with an argument
Function with an argument 2
Function that returns a value
Function with arguments, that returns a value
Conditionals
If statement
If...else statement
Random link
Switch statement
Looping
A for loop
Looping through HTML headers
A while loop
A do..while loop
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 stores 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
Display an alert box
Display an alert box with line breaks
Disable right-click IE only
Disable right-click only on content IE only
Display a confirm box IE only
Display a prompt box
Open a new window when clicking on a button
Open a new window and control its appearance
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 page 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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