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   1  /**
   2   * @provides javelin-behavior-phabricator-watch-anchor
   3   * @requires javelin-behavior
   4   *           javelin-stratcom
   5   *           javelin-dom
   6   *           javelin-vector
   7   */
   8  
   9  JX.behavior('phabricator-watch-anchor', function() {
  10  
  11    var highlighted;
  12  
  13    function highlight() {
  14      highlighted && JX.DOM.alterClass(highlighted, 'anchor-target', false);
  15      try {
  16        highlighted = JX.$('anchor-' + window.location.hash.replace('#', ''));
  17      } catch (ex) {
  18        highlighted = null;
  19      }
  20      highlighted && JX.DOM.alterClass(highlighted, 'anchor-target', true);
  21    }
  22  
  23    // Defer invocation so other listeners can update the document.
  24    function defer_highlight() {
  25      setTimeout(highlight, 0);
  26    }
  27  
  28    // In some cases, we link to an anchor but the anchor target ajaxes in
  29    // later. If it pops in within the first few seconds, jump to it.
  30    function try_anchor() {
  31      var anchor = window.location.hash.replace('#', '');
  32      try {
  33        // If the anchor exists, assume the browser handled the jump.
  34        if (anchor) {
  35          JX.$(anchor);
  36        }
  37        defer_highlight();
  38      } catch (e) {
  39        var n = 50;
  40        var try_anchor_again = function () {
  41          try {
  42            window.scrollTo(0, JX.$V(JX.$(anchor)).y - 60);
  43            defer_highlight();
  44          } catch (e) {
  45            if (n--) {
  46              setTimeout(try_anchor_again, 100);
  47            }
  48          }
  49        };
  50        try_anchor_again();
  51      }
  52    }
  53  
  54    JX.Stratcom.listen('hashchange', null, try_anchor);
  55    try_anchor();
  56  
  57  });