resources/src/mediawiki.action/mediawiki.action.view.redirect.js

   1 /*!
   2  * JavaScript to update page URL when a redirect is viewed, ensuring that the
   3  * page is scrolled to the id when it's a redirect with fragment.
   4  *
   5  * This is loaded in the top queue, so avoid unnecessary dependencies
   6  * like mediawiki.Title or mediawiki.Uri.
   7  */
   8 ( function ( mw, $ ) {
   9         var profile = $.client.profile(),
  10                 canonical = mw.config.get( 'wgInternalRedirectTargetUrl' ),
  11                 fragment = null,
  12                 node, shouldChangeFragment, index;
  13
  14         index = canonical.indexOf( '#' );
  15         if ( index !== -1 ) {
  16                 fragment = canonical.slice( index );
  17         }
  18
  19         // Never override the fragment if the user intended to look at a different section
  20         shouldChangeFragment = fragment && !location.hash;
  21
  22         // Replace the whole URL if possible, otherwise just change the fragment
  23         if ( canonical && history.replaceState ) {
  24                 if ( !shouldChangeFragment ) {
  25                         // If the current page view has a fragment already, don't override it
  26                         canonical = canonical.replace( /#.*$/, '' );
  27                         canonical += location.hash;
  28                 }
  29
  30                 // Note that this will update the hash in a modern browser, retaining back behaviour
  31                 history.replaceState( /* data= */ history.state, /* title= */ document.title, /* url= */ canonical );
  32                 if ( shouldChangeFragment ) {
  33                         // Specification for history.replaceState() doesn't require browser to scroll,
  34                         // so scroll to be sure (see also T110501). Support for IE9 and IE10.
  35                         node = document.getElementById( fragment.slice( 1 ) );
  36                         if ( node ) {
  37                                 node.scrollIntoView();
  38                         }
  39                 }
  40
  41         } else if ( shouldChangeFragment ) {
  42                 if ( profile.layout === 'webkit' && profile.layoutVersion < 420 ) {
  43                         // Released Safari w/ WebKit 418.9.1 messes up horribly
  44                         // Nightlies of 420+ are ok
  45                         return;
  46                 }
  47
  48                 location.hash = fragment;
  49         }
  50
  51         if ( shouldChangeFragment && profile.layout === 'gecko' ) {
  52                 // Mozilla needs to wait until after load, otherwise the window doesn't
  53                 // scroll.  See <https://bugzilla.mozilla.org/show_bug.cgi?id=516293>.
  54                 // There's no obvious way to detect this programmatically, so we use
  55                 // version-testing.  If Firefox fixes the bug, they'll jump twice, but
  56                 // better twice than not at all, so make the fix hit future versions as
  57                 // well.
  58                 $( function () {
  59                         if ( location.hash === fragment ) {
  60                                 location.hash = fragment;
  61                         }
  62                 } );
  63         }
  64
  65 }( mediaWiki, jQuery ) );