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define(function(require, exports, module){
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/**
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* This jQuery plugin displays pagination links inside the selected elements.
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*
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* @author Gabriel Birke (birke *at* d-scribe *dot* de)
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* @version 1.2
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* @param {int} maxentries Number of entries to paginate
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* @param {Object} opts Several options (see README for documentation)
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* @return {Object} jQuery Object
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*/
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jQuery.fn.pagination = function(maxentries, opts){
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opts = jQuery.extend({
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items_per_page:10,
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num_display_entries:10,
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current_page:0,
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num_edge_entries:0,
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link_to:"#",
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prev_text:"Prev",
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next_text:"Next",
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ellipse_text:"...",
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prev_show_always:true,
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next_show_always:true,
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callback:function(){return false;}
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},opts||{});
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return this.each(function() {
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/**
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* 计算最大分页显示数目
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*/
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function numPages() {
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return Math.ceil(maxentries/opts.items_per_page);
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}
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/**
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* 极端分页的起始和结束点，这取决于current_page 和 num_display_entries.
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* @返回 {数组(Array)}
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*/
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function getInterval() {
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var ne_half = Math.ceil(opts.num_display_entries/2);
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var np = numPages();
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var upper_limit = np-opts.num_display_entries;
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var start = current_page>ne_half?Math.max(Math.min(current_page-ne_half, upper_limit), 0):0;
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var end = current_page>ne_half?Math.min(current_page+ne_half, np):Math.min(opts.num_display_entries, np);
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return [start,end];
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}
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/**
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* 分页链接事件处理函数
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* @参数 {int} page_id 为新页码
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*/
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function pageSelected(page_id, evt){
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current_page = page_id;
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drawLinks();
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var continuePropagation = opts.callback(page_id, panel);
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if (!continuePropagation) {
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if (evt.stopPropagation) {
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evt.stopPropagation();
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}
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else {
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evt.cancelBubble = true;
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}
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}
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return continuePropagation;
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}
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/**
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* 此函数将分页链接插入到容器元素中
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*/
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function drawLinks() {
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panel.empty();
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var interval = getInterval();
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var np = numPages();
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// 这个辅助函数返回一个处理函数调用有着正确page_id的pageSelected。
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var getClickHandler = function(page_id) {
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return function(evt){ return pageSelected(page_id,evt); }
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}
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//辅助函数用来产生一个单链接(如果不是当前页则产生span标签)
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var appendItem = function(page_id, appendopts){
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page_id = page_id<0?0:(page_id<np?page_id:np-1); // 规范page id值
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appendopts = jQuery.extend({text:page_id+1, classes:""}, appendopts||{});
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if(page_id == current_page){
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var lnk = jQuery("<span class='current'>"+(appendopts.text)+"</span>");
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}else{
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var lnk = jQuery("<a>"+(appendopts.text)+"</a>")
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.bind("click", getClickHandler(page_id))
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.attr('href', opts.link_to.replace(/__id__/,page_id));
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}
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if(appendopts.classes){lnk.addClass(appendopts.classes);}
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panel.append(lnk);
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}
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// 产生"Previous"-链接
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if(opts.prev_text && (current_page > 0 || opts.prev_show_always)){
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appendItem(current_page-1,{text:opts.prev_text, classes:"prev"});
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}
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// 产生起始点
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if (interval[0] > 0 && opts.num_edge_entries > 0)
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{
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var end = Math.min(opts.num_edge_entries, interval[0]);
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for(var i=0; i<end; i++) {
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appendItem(i);
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}
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if(opts.num_edge_entries < interval[0] && opts.ellipse_text)
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{
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jQuery("<span>"+opts.ellipse_text+"</span>").appendTo(panel);
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}
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}
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// 产生内部的些链接
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for(var i=interval[0]; i<interval[1]; i++) {
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appendItem(i);
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}
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// 产生结束点
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if (interval[1] < np && opts.num_edge_entries > 0)
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{
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if(np-opts.num_edge_entries > interval[1]&& opts.ellipse_text)
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{
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jQuery("<span>"+opts.ellipse_text+"</span>").appendTo(panel);
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}
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var begin = Math.max(np-opts.num_edge_entries, interval[1]);
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for(var i=begin; i<np; i++) {
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appendItem(i);
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}
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}
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// 产生 "Next"-链接
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if(opts.next_text && (current_page < np-1 || opts.next_show_always)){
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appendItem(current_page+1,{text:opts.next_text, classes:"next"});
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}
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}
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//从选项中提取current_page
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var current_page = opts.current_page;
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//创建一个显示条数和每页显示条数值
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maxentries = (!maxentries || maxentries < 0)?1:maxentries;
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opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0)?1:opts.items_per_page;
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//存储DOM元素，以方便从所有的内部结构中获取
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var panel = jQuery(this);
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// 获得附加功能的元素
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this.selectPage = function(page_id){ pageSelected(page_id);}
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this.prevPage = function(){
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if (current_page > 0) {
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pageSelected(current_page - 1);
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return true;
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}
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else {
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return false;
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}
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}
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this.nextPage = function(){
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if(current_page < numPages()-1) {
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pageSelected(current_page+1);
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return true;
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}
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else {
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return false;
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}
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}
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// 所有初始化完成，绘制链接
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drawLinks();
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// 回调函数
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opts.callback(current_page, this);
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});
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}
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})
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