primeui-all.js
function(container, item) {        
            var borderTop = parseFloat(container.css('borderTopWidth')) || 0,
            paddingTop = parseFloat(container.css('paddingTop')) || 0,
            offset = item.offset().top - container.offset().top - borderTop - paddingTop,
            scroll = container.scrollTop(),
            elementHeight = container.height(),
            itemHeight = item.outerHeight(true);

            if(offset < 0) {
                container.scrollTop(scroll + offset);
            }
            else if((offset + itemHeight) > elementHeight) {
                container.scrollTop(scroll + offset - elementHeight + itemHeight);
            }
        }
function(container, item) {        
            var borderTop = parseFloat(container.css('borderTopWidth')) || 0,
            paddingTop = parseFloat(container.css('paddingTop')) || 0,
            offset = item.offset().top - container.offset().top - borderTop - paddingTop,
            scroll = container.scrollTop(),
            elementHeight = container.height(),
            itemHeight = item.outerHeight(true);

            if(offset < 0) {
                container.scrollTop(scroll + offset);
            }
            else if((offset + itemHeight) > elementHeight) {
                container.scrollTop(scroll + offset - elementHeight + itemHeight);
            }
        }
function ( container , item ) { var borderTop = parseFloat ( container . css ( 'borderTopWidth' ) ) || 0 , paddingTop = parseFloat ( container . css ( 'paddingTop' ) ) || 0 , offset = item . offset ( ) . top - container . offset ( ) . top - borderTop - paddingTop , scroll = container . scrollTop ( ) , elementHeight = container . height ( ) , itemHeight = item . outerHeight ( true ) ; if ( offset < 0 ) { container . scrollTop ( scroll + offset ) ; } else if ( ( offset + itemHeight ) > elementHeight ) { container . scrollTop ( scroll + offset - elementHeight + itemHeight ) ; } }
Aligns container scrollbar to keep item in container viewport, algorithm copied from jquery-ui menu widget
Aligns container scrollbar to keep item in container viewport algorithm copied from jquery - ui menu widget