JavaScript Examples

Basic JavaScript Examples

Write to the Document with JavaScript
Change HTML elements with JavaScript
An external JavaScript

Examples explained

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JavaScript Statements, Comments and Blocks

JavaScript statements.
JavaScript blocks.
Single line comments.
Multiple lines comments.
Single line comment to prevent execution.
Multiple lines comment to prevent execution.

Examples explained

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JavaScript Variables

Declare a variable, assign a value to it, and display it

Examples explained

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JavaScript Conditional If ... Else

If statement
If...else statement
Random link
Switch statement

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JavaScript Popup Boxes

Alert box
Alert box with line breaks
Confirm box
Prompt box

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JavaScript Functions

Call a function
Function with an argument
Function with an argument 2
Function that returns a value
Function with arguments, that returns a value

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JavaScript Loops

For loop
Looping through HTML headers
While loop
Do While loop
Break a loop
Break and continue a loop
Use a for...in statement to loop through the elements of an object

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JavaScript Events

Acting to the onclick event
Acting to the onmouseover event

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JavaScript Error Handling

The try...catch statement
The try...catch statement with a confirm box
The onerror event

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Advanced JavaScript Examples

Create a welcome cookie
Simple timing
Another simple timing
Timing event in an infinite loop
Timing event in an infinite loop - with a Stop button
A clock created with a timing event
Create a direct instance of an object
Create an object constructor