drupal/misc/collapse.js

// $Id$
(function($) {

/**
 * Toggle the visibility of a fieldset using smooth animations
 */
Drupal.toggleFieldset = function(fieldset) {
  if ($(fieldset).is('.collapsed')) {
    // Action div containers are processed separately because of a IE bug
    // that alters the default submit button behavior.
    var content = $('> div:not(.action)', fieldset);
    $(fieldset).removeClass('collapsed');
    content.hide();
    content.slideDown( {
      duration: 'fast',
      easing: 'linear',
      complete: function() {
        Drupal.collapseScrollIntoView(this.parentNode);
        this.parentNode.animating = false;
        $('div.action', fieldset).show();
      },
      step: function() {
        // Scroll the fieldset into view
        Drupal.collapseScrollIntoView(this.parentNode);
      }
    });
  }
  else {
    $('div.action', fieldset).hide();
    var content = $('> div:not(.action)', fieldset).slideUp('fast', function() {
      $(this.parentNode).addClass('collapsed');
      this.parentNode.animating = false;
    });
  }
};

/**
 * Scroll a given fieldset into view as much as possible.
 */
Drupal.collapseScrollIntoView = function (node) {
  var h = self.innerHeight || document.documentElement.clientHeight || $('body')[0].clientHeight || 0;
  var offset = self.pageYOffset || document.documentElement.scrollTop || $('body')[0].scrollTop || 0;
  var posY = $(node).offset().top;
  var fudge = 55;
  if (posY + node.offsetHeight + fudge > h + offset) {
    if (node.offsetHeight > h) {
      window.scrollTo(0, posY);
    } else {
      window.scrollTo(0, posY + node.offsetHeight - h + fudge);
    }
  }
};

Drupal.behaviors.collapse = {
  attach: function(context, settings) {
    $('fieldset.collapsible > legend:not(.collapse-processed)', context).each(function() {
      var fieldset = $(this.parentNode);
      // Expand if there are errors inside
      if ($('input.error, textarea.error, select.error', fieldset).size() > 0) {
        fieldset.removeClass('collapsed');
      }

      // Turn the legend into a clickable link and wrap the contents of the fieldset
      // in a div for easier animation
      var text = this.innerHTML;
        $(this).empty().append($('<a href="#">'+ text +'</a>').click(function() {
          var fieldset = $(this).parents('fieldset:first')[0];
          // Don't animate multiple times
          if (!fieldset.animating) {
            fieldset.animating = true;
            Drupal.toggleFieldset(fieldset);
          }
          return false;
        }))
        .after($('<div class="fieldset-wrapper"></div>')
        .append(fieldset.children(':not(legend):not(.action)')))
        .addClass('collapse-processed');
    });
  }
};

})(jQuery);