jquery-ui/ui/source/effects.blind.js

;(function($) {
  
  $.effects.blind = function(o) {

    return this.queue(function() {

      // Create element
      var el = $(this), props = ['position','top','left'];
      
      // Set options
      var mode = $.effects.setMode(el, o.options.mode || 'hide'); // Set Mode
      var direction = o.options.direction || 'vertical'; // Default direction
      
      // Adjust
      $.effects.save(el, props); el.show(); // Save & Show
      var wrapper = $.effects.createWrapper(el).css({overflow:'hidden'}); // Create Wrapper
      var ref = (direction == 'vertical') ? 'height' : 'width';
      var distance = (direction == 'vertical') ? wrapper.height() : wrapper.width();
      if(mode == 'show') wrapper.css(ref, 0); // Shift
      
      // Animation
      var animation = {};
      animation[ref] = mode == 'show' ? distance : 0;
     
      // Animate
      wrapper.animate(animation, o.duration, o.options.easing, function() {
        if(mode == 'hide') el.hide(); // Hide
        $.effects.restore(el, props); $.effects.removeWrapper(el); // Restore
        if(o.callback) o.callback.apply(el[0], arguments); // Callback
        el.dequeue();
      });
      
    });
    
  };
  
})(jQuery);