JavaScript tutorial

JavaScript is a compact, object-based scripting language for developing client and server Internet applications.

1. JavaScript functions can be embedded directly in the HTML code and should be placed in the head of the HTML document
2. To use JavaScript functions the code needs to follow the line: <SCRIPT LANGUAGE="JavaScript"> and preceed </SCRIPT>
3. and bracketed by <!-- and -->
4. JavaScript is case sensitive and uses new lines to terminate a line of code; semicolons can be used to separate lines of code on a line
5. JavaScript uses both // and /* */ to indicate comments
6. JavaScript supports data types: numeric, string, Boolean, and null
7. JavaScript supports operators: +, -, *, /, %, ++, --, =, +=, -=, *=, /=, %=, &&, ||, !, &, |, ^
8. JavaScript uses the control structures: if (else), for, while, and for...in
9. JavaScript contains three user interfaces: alert(message), prompt(message, [Default]), confirm(message)
10. JavaScript does not have built-in support for arrays, but does allow for building of arrays
11. JavaScript supports four built-in objects:
    • Window
      • Properties: name, parent, self, top, defaultstatus, status, script, location, frame, history, navigator, document
      • Methods: Alert, Confirm, Prompt, Open, Close, SetTimeout, ClearTimeout, Navigate
      • Events: Onload, Unload
    • String
    • Math
    • Date

JavaScript links JavaScript and the Internet Notes Doc JavaScript JavaScript for the World Wide Web Javascripts.com JavaScript Client Sniffer JAVASCRIPT 1.2 NEW WINDOW METHODS AND PROPERTIES The JavaScript Resource Ask the JavaScript Pro Netscape's handbook Java Script MiniFaq (With great links) Tutorial & Language Reference User Detail Scripts ECMAScript Compliance Tester

Links to pages displaying JavaScript Hello World Test alert, confirm and prompt windows Testing for a number using a prompt window and isNaN Display Squares of Numbers Multiply two numbers English Comprehension example with Frames Frames Example Status Line Marquee Javascript function to show late date modified JavaScript Virus ;-) JavaScript hack Example showing how to select choices from a drop-down list Example showing color selection Y2K Problems with JavaScript Other examples Online Applicaton Form Slide Show WWW Extras Quiz Replacement Killers example of DHTML & JavaScript

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