paulwalko.github.io/javascripts/simplePagination.js

/**
* simplePagination.js v1.6
* A simple jQuery pagination plugin.
* http://flaviusmatis.github.com/simplePagination.js/
*
* Copyright 2012, Flavius Matis
* Released under the MIT license.
* http://flaviusmatis.github.com/license.html
*/

(function($){

    var methods = {
        init: function(options) {
            var o = $.extend({
                items: 1,
                itemsOnPage: 1,
                pages: 0,
                displayedPages: 5,
                edges: 2,
                currentPage: 0,
                hrefTextPrefix: '#page-',
                hrefTextSuffix: '',
                prevText: 'Prev',
                nextText: 'Next',
                ellipseText: '…',
                cssStyle: 'light-theme',
                listStyle: '',
                labelMap: [],
                selectOnClick: true,
                nextAtFront: false,
                invertPageOrder: false,
                useStartEdge : true,
                useEndEdge : true,
                onPageClick: function(pageNumber, event) {
                    // Callback triggered when a page is clicked
                    // Page number is given as an optional parameter
                },
                onInit: function() {
                    // Callback triggered immediately after initialization
                }
            }, options || {});

            var self = this;

            o.pages = o.pages ? o.pages : Math.ceil(o.items / o.itemsOnPage) ? Math.ceil(o.items / o.itemsOnPage) : 1;
            if (o.currentPage)
                o.currentPage = o.currentPage - 1;
            else
                o.currentPage = !o.invertPageOrder ? 0 : o.pages - 1;
            o.halfDisplayed = o.displayedPages / 2;

            this.each(function() {
                self.addClass(o.cssStyle + ' simple-pagination').data('pagination', o);
                methods._draw.call(self);
            });

            o.onInit();

            return this;
        },

        selectPage: function(page) {
            methods._selectPage.call(this, page - 1);
            return this;
        },

        prevPage: function() {
            var o = this.data('pagination');
            if (!o.invertPageOrder) {
                if (o.currentPage > 0) {
                    methods._selectPage.call(this, o.currentPage - 1);
                }
            } else {
                if (o.currentPage < o.pages - 1) {
                    methods._selectPage.call(this, o.currentPage + 1);
                }
            }
            return this;
        },

        nextPage: function() {
            var o = this.data('pagination');
            if (!o.invertPageOrder) {
                if (o.currentPage < o.pages - 1) {
                    methods._selectPage.call(this, o.currentPage + 1);
                }
            } else {
                if (o.currentPage > 0) {
                    methods._selectPage.call(this, o.currentPage - 1);
                }
            }
            return this;
        },

        getPagesCount: function() {
            return this.data('pagination').pages;
        },

        setPagesCount: function(count) {
            this.data('pagination').pages = count;
        },

        getCurrentPage: function () {
            return this.data('pagination').currentPage + 1;
        },

        destroy: function(){
            this.empty();
            return this;
        },

        drawPage: function (page) {
            var o = this.data('pagination');
            o.currentPage = page - 1;
            this.data('pagination', o);
            methods._draw.call(this);
            return this;
        },

        redraw: function(){
            methods._draw.call(this);
            return this;
        },

        disable: function(){
            var o = this.data('pagination');
            o.disabled = true;
            this.data('pagination', o);
            methods._draw.call(this);
            return this;
        },

        enable: function(){
            var o = this.data('pagination');
            o.disabled = false;
            this.data('pagination', o);
            methods._draw.call(this);
            return this;
        },

        updateItems: function (newItems) {
            var o = this.data('pagination');
            o.items = newItems;
            o.pages = methods._getPages(o);
            this.data('pagination', o);
            methods._draw.call(this);
        },

        updateItemsOnPage: function (itemsOnPage) {
            var o = this.data('pagination');
            o.itemsOnPage = itemsOnPage;
            o.pages = methods._getPages(o);
            this.data('pagination', o);
            methods._selectPage.call(this, 0);
            return this;
        },

        getItemsOnPage: function() {
            return this.data('pagination').itemsOnPage;
        },

        _draw: function() {
            var o = this.data('pagination'),
                interval = methods._getInterval(o),
                i,
                tagName;

            methods.destroy.call(this);

            tagName = (typeof this.prop === 'function') ? this.prop('tagName') : this.attr('tagName');

            var $panel = tagName === 'UL' ? this : $('<ul' + (o.listStyle ? ' class="' + o.listStyle + '"' : '') + '></ul>').appendTo(this);

            // Generate Prev link
            if (o.prevText) {
                methods._appendItem.call(this, !o.invertPageOrder ? o.currentPage - 1 : o.currentPage + 1, {text: o.prevText, classes: 'prev'});
            }

            // Generate Next link (if option set for at front)
            if (o.nextText && o.nextAtFront) {
                methods._appendItem.call(this, !o.invertPageOrder ? o.currentPage + 1 : o.currentPage - 1, {text: o.nextText, classes: 'next'});
            }

            // Generate start edges
            if (!o.invertPageOrder) {
                if (interval.start > 0 && o.edges > 0) {
                    if(o.useStartEdge) {
                        var end = Math.min(o.edges, interval.start);
                        for (i = 0; i < end; i++) {
                            methods._appendItem.call(this, i);
                        }
                    }
                    if (o.edges < interval.start && (interval.start - o.edges != 1)) {
                        $panel.append('<li class="disabled"><span class="ellipse">' + o.ellipseText + '</span></li>');
                    } else if (interval.start - o.edges == 1) {
                        methods._appendItem.call(this, o.edges);
                    }
                }
            } else {
                if (interval.end < o.pages && o.edges > 0) {
                    if(o.useStartEdge) {
                        var begin = Math.max(o.pages - o.edges, interval.end);
                        for (i = o.pages - 1; i >= begin; i--) {
                            methods._appendItem.call(this, i);
                        }
                    }

                    if (o.pages - o.edges > interval.end && (o.pages - o.edges - interval.end != 1)) {
                        $panel.append('<li class="disabled"><span class="ellipse">' + o.ellipseText + '</span></li>');
                    } else if (o.pages - o.edges - interval.end == 1) {
                        methods._appendItem.call(this, interval.end);
                    }
                }
            }

            // Generate interval links
            if (!o.invertPageOrder) {
                for (i = interval.start; i < interval.end; i++) {
                    methods._appendItem.call(this, i);
                }
            } else {
                for (i = interval.end - 1; i >= interval.start; i--) {
                    methods._appendItem.call(this, i);
                }
            }

            // Generate end edges
            if (!o.invertPageOrder) {
                if (interval.end < o.pages && o.edges > 0) {
                    if (o.pages - o.edges > interval.end && (o.pages - o.edges - interval.end != 1)) {
                        $panel.append('<li class="disabled"><span class="ellipse">' + o.ellipseText + '</span></li>');
                    } else if (o.pages - o.edges - interval.end == 1) {
                        methods._appendItem.call(this, interval.end);
                    }
                    if(o.useEndEdge) {
                        var begin = Math.max(o.pages - o.edges, interval.end);
                        for (i = begin; i < o.pages; i++) {
                            methods._appendItem.call(this, i);
                        }
                    }
                }
            } else {
                if (interval.start > 0 && o.edges > 0) {
                    if (o.edges < interval.start && (interval.start - o.edges != 1)) {
                        $panel.append('<li class="disabled"><span class="ellipse">' + o.ellipseText + '</span></li>');
                    } else if (interval.start - o.edges == 1) {
                        methods._appendItem.call(this, o.edges);
                    }

                    if(o.useEndEdge) {
                        var end = Math.min(o.edges, interval.start);
                        for (i = end - 1; i >= 0; i--) {
                            methods._appendItem.call(this, i);
                        }
                    }
                }
            }

            // Generate Next link (unless option is set for at front)
            if (o.nextText && !o.nextAtFront) {
                methods._appendItem.call(this, !o.invertPageOrder ? o.currentPage + 1 : o.currentPage - 1, {text: o.nextText, classes: 'next'});
            }
        },

        _getPages: function(o) {
            var pages = Math.ceil(o.items / o.itemsOnPage);
            return pages || 1;
        },

        _getInterval: function(o) {
            return {
                start: Math.ceil(o.currentPage > o.halfDisplayed ? Math.max(Math.min(o.currentPage - o.halfDisplayed, (o.pages - o.displayedPages)), 0) : 0),
                end: Math.ceil(o.currentPage > o.halfDisplayed ? Math.min(o.currentPage + o.halfDisplayed, o.pages) : Math.min(o.displayedPages, o.pages))
            };
        },

        _appendItem: function(pageIndex, opts) {
            var self = this, options, $link, o = self.data('pagination'), $linkWrapper = $('<li></li>'), $ul = self.find('ul');

            pageIndex = pageIndex < 0 ? 0 : (pageIndex < o.pages ? pageIndex : o.pages - 1);

            options = {
                text: pageIndex + 1,
                classes: ''
            };

            if (o.labelMap.length && o.labelMap[pageIndex]) {
                options.text = o.labelMap[pageIndex];
            }

            options = $.extend(options, opts || {});

            if (pageIndex == o.currentPage || o.disabled) {
                if (o.disabled || options.classes === 'prev' || options.classes === 'next') {
                    $linkWrapper.addClass('disabled');
                } else {
                    $linkWrapper.addClass('active');
                }
                $link = $('<span class="current">' + (options.text) + '</span>');
            } else {
                $link = $('<a href="' + o.hrefTextPrefix + (pageIndex + 1) + o.hrefTextSuffix + '" class="page-link">' + (options.text) + '</a>');
                $link.click(function(event){
                    return methods._selectPage.call(self, pageIndex, event);
                });
            }

            if (options.classes) {
                $link.addClass(options.classes);
            }

            $linkWrapper.append($link);

            if ($ul.length) {
                $ul.append($linkWrapper);
            } else {
                self.append($linkWrapper);
            }
        },

        _selectPage: function(pageIndex, event) {
            var o = this.data('pagination');
            o.currentPage = pageIndex;
            if (o.selectOnClick) {
                methods._draw.call(this);
            }
            return o.onPageClick(pageIndex + 1, event);
        }

    };

    $.fn.pagination = function(method) {

        // Method calling logic
        if (methods[method] && method.charAt(0) != '_') {
            return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof method === 'object' || !method) {
            return methods.init.apply(this, arguments);
        } else {
            $.error('Method ' +  method + ' does not exist on jQuery.pagination');
        }

    };

})(jQuery);