typeof returning “unknown” in IE

by

According to a duplicate question at Bytes, the typeof value unknown is added to JScript version 8, along with date.

A comment to a blog by Robert Nyman can also be explanatory:

Internet Explorer displays “unknown” when the object in question is on
the other side of a COM+ bridge. You may not know this or realize
this, but MS’s XMLHTTP object is part of a different COM+ object that
implements IUnknown; when you call methods on it, you’re doing so over
a COM bridge and not calling native JavaScript.

Basically that’s MS’s answer if you try to test or access something
that’s not a true part of the JScript engine.

More Related Contents:

  1. Why doesn’t indexOf work on an array IE8?
  2. Why does typeof array with objects return “object” and not “array”? [duplicate]
  3. forEach on querySelectorAll not working in recent Microsoft browsers
  4. Internet Explorer 11 detection
  5. Can I load an entire HTML document into a document fragment in Internet Explorer?
  6. PNG transparency issue in IE8
  7. Running .exe from Javascript
  8. Can’t set innerHTML on tbody in IE
  9. DOM refresh on long running function
  10. Better way to get type of a Javascript variable?
  11. Differentiate IE7 browser and browser in IE7 compatibility mode
  12. How to open maximized window with Javascript?
  13. How can I detect browser type using jQuery?
  14. Support for ES6 in Internet Explorer 11
  15. Prevent Use of the Back Button (in IE)
  16. How can I use JavaScript to transform XML & XSLT?
  17. detecting when the “File download” popup is closed
  18. How to reference the caller object (“this”) using attachEvent
  19. Add a link stylesheet dynamically in the [closed]
  20. How do you detect support for VML or SVG in a browser
  21. IE’s document.selection.createRange doesn’t include leading or trailing blank lines
  22. Why does Firefox react differently from Webkit and IE to “click” event on “select” tag?
  23. includes() not working in all browsers
  24. What’s the reason to use === instead of == with typeof in Javascript?
  25. “Permission denied” with Internet Explorer and jQuery
  26. Can’t dynamically add rows to a in IE?
  27. Getting selected text with CKEditor Plugin on IE
  28. Print PDF File in IFrame using javascript getting one page only
  29. Images failing to load in IE with DOM: 7009 error (unable to decode) in console
  30. OnChange not firing in IE

Leave a Comment