Background information

Scripting conventions

Some useful scripts:

User Alerts

Page information

Pull-down menus

Random images

Mouseovers

Windows and remotes

Where to go from here



Classes home

HTML Info home

 

Javascript

Jeff Williamson
Northern Virginia Community College
www.nvcc.edu/home/nvwillj/html-graphics/
nvwillj@nvcc.edu


User Alerts

One of the easiest things you can do with Javascript is to put some information in an alert box which displays before a page loads.  

Click >>here<< for a demo.

Here's the code for the demo:

<HTML>
<HEAD>
<SCRIPT>
alert("
By accessing this page, you agree to the Acceptable Use Policy. See the boss for more info before he sees you.")
</SCRIPT>

<TITLE>Success!</TITLE>
</HEAD>
<BODY>

Easy, no?  This script could go anywhere.

In the <HEAD> tags above, it runs before the <BODY> of the page can load.  

At the end of a page, it would display only after elements above it in the <BODY> loaded.

Note 1: Alert boxes are noisy and disruptive, so use them sparingly. They are the car horns of the HTML world.

Note 2: You can't format Alert-box information. You can't use HTML tags, and the Alert boxes themselves differ widely from browser to browser and platform to platform.

Note 3: You also can't change the browser name and Javascript identifiers in the Alert box.  This is to prevent scripts from spoofing real system events like logons.