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JavaScript and Embedded Objects


There's more to Web browsers than (X)HTML, CSS, and JavaScript. ActiveX, plug-ins, and other embedded objects help make the Web what it is today. Get the scoop on these and more in this chapter excerpt from JavaScript: The Complete Reference, second edition, by Thomas Powell and Fritz Schneider McGraw-Hill/Osborne, ISBN 0072253576.

Author Info:
By: McGraw-Hill/Osborne
Rating: 4 stars4 stars4 stars4 stars4 stars / 92
October 26, 2004
TABLE OF CONTENTS:
  1. · JavaScript and Embedded Objects
  2. · Java
  3. · Including Applets
  4. · Accessing Applets in JavaScript
  5. · Issues with JavaScript-Driven Applets
  6. · Plug-ins
  7. · MIME Types
  8. · Detecting Specific Plug-Ins
  9. · Interacting with Plug-Ins
  10. · Refreshing the Plug-Ins Array
  11. · Interacting with a Specific Plug-In
  12. · ActiveX
  13. · Cross-Browser Inclusion of Embedded Objects
  14. · Interacting with ActiveX Controls
  15. · Summary

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JavaScript and Embedded Objects - Refreshing the Plug-Ins Array
(Page 10 of 15 )

Suppose you have written some custom JavaScript to harness the capabilities provided by a specific plug-in. When users visit your page without the plug-in they are prompted to install it because you have included the proper pluginspage attribute in your <embed>. Unfortunately, if a user visits your page without the plug-in, agrees to download and install it, and then returns to your page, your JavaScript will not detect that the browser has the required plug-in. The reason is that the plugins[] array needs to be refreshed whenever a new plug-in is installed (a browser restart will work as well).

Refreshing the plugins[] array is as simple as invoking its refresh()method. Doing so causes the browser to check for newly installed plug-ins and to reflect the changes in the plugins[] and mimeTypes[]arrays. This method takes a Boolean argument indicating whether the browser should reload any current documents containing an <embed>.If you supply true, the browser causes any documents (and frames) that might be able to take advantage of the new plug-in to reload. If false is passed to the method, the plugins[] array is updated, but no documents are reloaded. A typical example of the methodís use is found here:

<em>If you have just installed the plugin, please <a href="javascript:navigator.plugins.refresh(true)">reload the page with plugin support</a></em>

Of course, this should be presented only to users of Netscape, Opera, or Mozilla-based browsers where plug-ins are supported in the first place.

McGraw-Hill-OsborneThis chapter is from JavaScript: The Complete Reference, second edition, by Thomas Powell and Fritz Schneider, McGraw-Hill/Osborne, ISBN: 0072253576). Check it out at your favorite bookstore today.

Buy this book now.


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