JavaScript: Difference between revisions
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[[wikipedia:JavaScript | JavaScript]] is a programming language supported by many browsers which allows | [[wikipedia:JavaScript | JavaScript]] is a programming language supported by many browsers which allows webpage authors to have greater control over the user’s browsing experience. JavaScript is often used to create fly-out menus, invoke pop-up windows, validate form data and so on. Please note that [[JavaScript is not Java]]! | ||
Any errors that may occur when the browser tries to run JavaScript will appear in the [http://developer.mozilla.org/en/docs/JavaScript_Console JavaScript Console]. | Any errors that may occur when the browser tries to run JavaScript will appear in the [http://developer.mozilla.org/en/docs/JavaScript_Console JavaScript Console]. | ||
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==Advanced JavaScript settings== | ==Advanced JavaScript settings== | ||
These advanced settings are accessible when you enable JavaScript (see above) and, in Firefox, when you press the "Advanced" button. | These advanced settings are accessible when you enable JavaScript (see above) and, in Firefox, when you press the "Advanced" button. You can allow scripts on web pages to take certain actions by checking the appropriate boxes, or you can prevent the actions by unchecking these settings: | ||
'''Move or resize existing windows''': Allows | '''Move or resize existing windows''': Allows scripts to change the size or position of the existing window. | ||
'''Raise or lower windows''': Allows | '''Raise or lower windows''': Allows scripts to place windows underneath or on top of other windows. | ||
'''Disable or replace context menus''': Allows | '''Disable or replace context menus''': Allows scripts to disable or change context (right-click) menus. | ||
'''Hide the status bar''': Allows | '''Hide the status bar''': Allows scripts to hide the status bar, as in popup windows. | ||
'''Change status bar text''': Allows | '''Change status bar text''': Allows scripts to replace the status bar web address (URL) with scrolling text. | ||
'''Change images''': Allows | '''Change images''': Allows scripts to change or animate images, as in image rollovers. '''Warning''': Unchecking this setting can make some webpage menus harder to navigate, disable features like zooming in and out of maps or prevent some images from loading [https://bugzilla.mozilla.org/show_bug.cgi?id=239438]. (This option has been removed from the Advanced JavaScript Settings window in Firefox 1.5.) | ||
==See also== | ==See also== | ||
[[Allowing only certain sites to use JavaScript]] | * [[Allowing only certain sites to use JavaScript]] | ||
* [[Prevent websites from disabling new window features]] | |||
[[Category:Page display]] | [[Category:Page display]] | ||
[[Category:General concepts]] | [[Category:General concepts]] | ||
Revision as of 14:27, 27 June 2006
JavaScript is a programming language supported by many browsers which allows webpage authors to have greater control over the user’s browsing experience. JavaScript is often used to create fly-out menus, invoke pop-up windows, validate form data and so on. Please note that JavaScript is not Java!
Any errors that may occur when the browser tries to run JavaScript will appear in the JavaScript Console.
Enabling JavaScript
Many web pages require JavaScript to work properly. To make sure that JavaScript is enabled in Firefox or Mozilla Suite, check these settings:
- Firefox: "Tools -> Options -> Content (Web Features in Firefox 1.0.x) -> Enable JavaScript".
- Mozilla Suite: "Edit -> Preferences -> Advanced -> Scripts & Plug-ins -> Enable JavaScript for -> Navigator"
(Note: The setting to enable JavaScript for the "Mail & Newsgroups" component is disabled by default, for security reasons.)
Advanced JavaScript settings
These advanced settings are accessible when you enable JavaScript (see above) and, in Firefox, when you press the "Advanced" button. You can allow scripts on web pages to take certain actions by checking the appropriate boxes, or you can prevent the actions by unchecking these settings:
Move or resize existing windows: Allows scripts to change the size or position of the existing window.
Raise or lower windows: Allows scripts to place windows underneath or on top of other windows.
Disable or replace context menus: Allows scripts to disable or change context (right-click) menus.
Hide the status bar: Allows scripts to hide the status bar, as in popup windows.
Change status bar text: Allows scripts to replace the status bar web address (URL) with scrolling text.
Change images: Allows scripts to change or animate images, as in image rollovers. Warning: Unchecking this setting can make some webpage menus harder to navigate, disable features like zooming in and out of maps or prevent some images from loading [1]. (This option has been removed from the Advanced JavaScript Settings window in Firefox 1.5.)
