page.js
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/**
* Jquery 分页插件
*
* Created by Alex Yang
*/
jQuery.fn.page = function (maxentries, opts) {
opts = jQuery.extend({
items_per_page: 10, //每页显示几条
num_display_entries: 10, //显示几页
current_page: 0, //当前页,begin:0
num_edge_entries: 0, //边缘显示数
link_to: "javascript:;", //分页url
prev_text: "<",
next_text: ">",
info_text: "第{0}页/共{1}页",
ellipse_text: "...", //当边缘数!=0时,显示的分割文字
current_class: "", //选中页样式
next_class: "next", //下一页样式
prev_class: "prev", //上一页样式
info_class: "",
prev_show_always: false, //是否显示上一页
next_show_always: false, //是否显示下一页
info_show_always: true,
load_first_page: false,
first_page_show: true, //只有一页是否显示分页信息
callback: function () {
return true;
}
}, opts || {});
return this.each(function () {
/**
* 计算最大页数
*/
function numPages() {
return Math.ceil(maxentries / opts.items_per_page);
}
function getInterval() {
var ne_half = Math.ceil(opts.num_display_entries / 2);
var np = numPages();
var upper_limit = np - opts.num_display_entries;
var start = current_page > ne_half ? Math.max(Math.min(current_page - ne_half, upper_limit), 0) : 0;
var end = current_page > ne_half ? Math.min(current_page + ne_half - 1, np) : Math.min(opts.num_display_entries, np);
return [start, end];
}
function pageSelected(page_id, evt) {
current_page = page_id;
drawLinks();
var continuePropagation = opts.callback(page_id, panel);
if (!continuePropagation) {
if (evt.stopPropagation) {
evt.stopPropagation();
}
else {
evt.cancelBubble = true;
}
}
return continuePropagation;
}
function drawLinks() {
panel.empty();
var interval = getInterval();
var np = numPages();
if (np && np <= 1 && !opts.first_page_show) {
return;
}
var getClickHandler = function (page_id) {
return function (evt) {
return pageSelected(page_id, evt);
}
};
var appendItem = function (page_id, appendopts) {
page_id = page_id < 0 ? 0 : (page_id < np ? page_id : np - 1);
appendopts = jQuery.extend({text: page_id + 1, classes: ""}, appendopts || {});
if (page_id == current_page) {
var lnk = jQuery("<b class='" + opts.current_class + "'>" + (appendopts.text) + "</b>");
}
else {
var lnk = jQuery("<a>" + (appendopts.text) + "</a>")
.bind("click", getClickHandler(page_id))
.attr('href', opts.link_to.replace("{id}", (page_id)));
}
if (appendopts.classes) {
lnk.addClass(appendopts.classes);
}
panel.append(lnk);
//fix 样式空隙 bug
panel.append(" ");
};
// 生成上一页按钮
if (opts.prev_text && (current_page > 0 || opts.prev_show_always)) {
appendItem(current_page - 1, {text: opts.prev_text, classes: opts.prev_class});
}
// 生成起始页
if (interval[0] > 0 && opts.num_edge_entries > 0) {
var end = Math.min(opts.num_edge_entries, interval[0]);
for (var i = 0; i < end; i++) {
appendItem(i);
}
if (opts.num_edge_entries < interval[0] && opts.ellipse_text) {
jQuery("<em>" + opts.ellipse_text + "</em>").appendTo(panel);
}
}
// 生成分页区间
for (var i = interval[0]; i < interval[1]; i++) {
appendItem(i);
}
// 生成结束页
if (interval[1] < np && opts.num_edge_entries > 0) {
if (np - opts.num_edge_entries > interval[1] && opts.ellipse_text) {
jQuery("<em>" + opts.ellipse_text + "</em>").appendTo(panel);
}
var begin = Math.max(np - opts.num_edge_entries, interval[1]);
for (var i = begin; i < np; i++) {
appendItem(i);
}
}
// 生成下一页按钮
if (opts.next_text && (current_page < np - 1 || opts.next_show_always)) {
appendItem(current_page + 1, {text: opts.next_text, classes: opts.next_class});
}
// 生成页面信息
if (opts.info_show_always) {
var info = jQuery("<span class='" + opts.info_class + "'>" + (opts.info_text.replace("{0}", current_page + 1).replace("{1}", np)) + "</span>");
panel.append(info);
}
}
var current_page = opts.current_page;
maxentries = (!maxentries || maxentries < 0) ? 1 : maxentries;
opts.items_per_page = (!opts.items_per_page || opts.items_per_page < 0) ? 1 : opts.items_per_page;
var panel = jQuery(this);
this.numPages = function () {
return numPages();
}
this.selectPage = function (page_id) {
pageSelected(page_id);
}
this.prevPage = function () {
if (current_page > 0) {
pageSelected(current_page - 1);
return true;
}
else {
return false;
}
}
this.nextPage = function () {
if (current_page < numPages() - 1) {
pageSelected(current_page + 1);
return true;
}
else {
return false;
}
}
// 初始化
drawLinks();
// 执行回掉函数
if (opts.load_first_page) {
opts.callback(current_page, this);
}
});
}