使 WillPaginate 支持用左右键翻页

will_paginate.js

// Keyboard shortcuts for browsing pages of lists
(function($) {
    $(document).keydown(handleKey);
    function handleKey(e) {
        var left_arrow = 37;
        var right_arrow = 39;

        if (e.target.nodeName == 'BODY' || e.target.nodeName == 'HTML') {
            if (!e.ctrlKey && !e.altKey && !e.shiftKey && !e.metaKey) {
                var code = e.which;
                if (code == left_arrow) {
                    prevPage();
                }
                else if (code == right_arrow) {
                    nextPage();
                }
            }
        }
    }

    function prevPage() {
        var href = $('.pagination .previous_page').attr('href');
        if (href && href != document.location) {
            document.location = href;
        }
    }

    function nextPage() {
        var href = $('.pagination .next_page').attr('href');
        if (href && href != document.location) {
            document.location = href;
        }
    }
})(jQuery);