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Javascript Notes

Notes on how to code with Javascript.

Javascript Variable Declaration

Declare a variable x equal to 5:

var x = 5;


How to Add A Javascript Script to Your Page

Javascript is put into script tags, and can be put in the head section of your html page. Below is a simple example that will display an alert when the page is loaded. Note we have not used a function, so it does not need to be called and will run by default when the page is loaded.

Here's the full web page code:

<!doctype html>

<meta charset="utf-8">
<title>Javascript Simple Alert Example</title>
<script language="javascript">
alert("Hi there, welcome to this page.")


<p>Javascript simple alert example page.</p>



See working example.

JavaScript Comments

// Single line comment

Multiline comment 1
Multiline comment 2
Multiline comment 3


Method that returns the element that has a given id.


innerHTML Property

The HTML content of an element.

The innerHTML property sets or returns the HTML content (inner HTML) of an element.


Javascript Back

<a href='javascript:history.go(-1)'>back</a>

Javascript Refresh Page

<input type="button" value="Refresh Page" onClick="window.location.reload()">


<a onClick="window.location.reload()">Refresh</a>

Javascript Status Bar Masking

<a href="http://www.youraffiliate link" onMouseOver="window.status='your text here!'; return true" onMouseOut="window.status=''; return true">Click here</a>

Bookmark This Page Script

I found this example script at:


However, I found it to only provide an Add to Bookmarks pop-up in Firefox, so it does not add that much value to the user. Here's the working example.

JavaScript Fade Out Effect

See Demo JavaScript Fade Out

JavaScript Example - A Multiplication Table

JavaScript Multiplication Table




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