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JavaScript FAQ

Answers to Questions about...
Troubleshooting JavaScript/JScript

5. Jscript Issues

What's new in Microsoft JScript version 2.x and 3.x?

More than can fit here. Some items are compatible with Navigator 3.0+ (such as the Array object). Others are unique to MSIE, such as the Dictionary and TextStream objects (acccessible via ActiveX). Additions are to the core language, not the document object model.

New functions let you determine the JScript version installed in IE, but JScript version 2 must be installed to get this data. If you use version 2 or 3.x language features, see www.microsoft.com/JScript for info about including a link button on your page to encourage visitors to upgrade their IE 3.0x to JScript version 2.

How do I know if I have JScript version 2 installed?

Installation of MSIE 3.02 does not guarantee JScript version 2. Search your disk for 'jscript.dll'. Get the file's properties, and click on the Version tab. The File version should begin with '2'. If not, download the latest version from Microsoft (installer is 442KB).

What parts of the JavaScript object model are unsupported in MSIE?

UNSUPPORTED OBJECTS

Image -- this means no onMouseOver swappable images in MSIE 3

Area -- no onMouseOvers

Applet

FileUpload

*Array -- hard-wired (JS1.0) arrays OK; implemented in JScript v.2.

MimeType

Plugin

What properties/methods/event handlers are unsupported in MSIE?

UNSUPPORTED PROPERTIES/METHODS/EVENT HANDLERS
OF SUPPORTED OBJECTS

Window

      onerror  closed  blur()  focus()  scroll()  onBlur=   onFocus=

Location

      reload()  replace()

Document

      applets[]  domain  embeds[]  images[]  URL

Link

      onMouseOut=

Form

      reset()  onReset=

All Form Elements

      type

Navigator

      mimeTypes[]  plugins[]  javaEnabled()

String

      prototype  split()

One more item: the <SCRIPT SRC="xxx.js"> facility for loading external JavaScript library files is available in MSIE 3.02 for Windows.

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