bootstrap-tooltip-placement

(function($) {
	$.fn.popover.Constructor.prototype.show = function() {
		var fallback_position = 'top';
		var e = $.Event('show.bs.' + this.type);
		
		if (this.hasContent() && this.enabled) {
	
			if (e.isDefaultPrevented()) {
				return;
			}
	
			var $tip = this.tip();
	
			this.setContent();
	
			if (this.options.animation) {
				$tip.addClass('fade');
			}
	
			var placement = (typeof this.options.placement == 'function') ?
				this.options.placement.call(this, $tip[0], this.$element[0]) :
				this.options.placement;
	
			$tip.detach().css({ top: 0, left: 0, display: 'block' });
	
			this.options.container ? $tip.appendTo(this.options.container) : $tip.insertAfter(this.$element);
	
			var tp;
			var pos = this.getPosition();
			var actualWidth = $tip[0].offsetWidth;
			var actualHeight = $tip[0].offsetHeight;
	
			// Get positions
			var tpt = {top: pos.top - actualHeight, left: pos.left + pos.width / 2 - actualWidth / 2};
			var tpb = {top: pos.top + pos.height, left: pos.left + pos.width / 2 - actualWidth / 2};
			var tpl = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth};
			var tpr = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width};
	
			// Get position room
			var hast = (tpt.top > $(window).scrollTop());
			var hasb = ((tpb.top + actualHeight) < ($(window).scrollTop() + $(window).height()));
			var hasl = (tpl.left > $(window).scrollLeft());
			var hasr = ((tpr.left + actualWidth) < ($(window).scrollLeft() + $(window).width()));
	
			switch (placement) {
				case 'top':
					if (!hast) {
						placement = hasb ? 'bottom' : (hasr ? 'right' : (hasl ? 'left' : fallback_position));
					}
					break;
				case 'bottom':
					if (!hasb) {
						placement = hast ? 'top' : (hasr ? 'right' : (hasl ? 'left' : fallback_position));
					}
					break;
				case 'left':
					if (!hasl) {
						placement = hasr ? 'right' : (hast ? 'top' : (hasb ? 'bottom' : fallback_position));
					}
					break;
				case 'right':
					if (!hasr) {
						placement = hasl ? 'left' : (hast ? 'top' : (hasb ? 'bottom' : fallback_position));
					}
					break;
			}
	
			switch (placement) {
				case 'top':
					tp = tpt;
					break;
				case 'bottom':
					tp = tpb;
					break;
				case 'left':
					tp = tpl;
					break;
				case 'right':
					tp = tpr;
					break;
			}
	
			this.applyPlacement(tp, placement);
			this.$element.trigger('shown.bs.' + this.type);
		}
	}
})(jQuery);