[JQuery]分页插件jQuery pager plugin功能扩展

本文主要是介绍[JQuery]分页插件jQuery pager plugin功能扩展，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

因为项目需要用到了这个插件，但这个插件本身的功能无法达到产品要求，所以对这个插件进行了一些扩展，以下是扩展点：

1、修改原插件只能传递总页码数部分，修正为传递PageSize以及RecordCount，由这两部分计算出总页码数

2、增加当前页码与总页码判断，如果当前页码大于总页码，则修正当前页码为总页码数（当前页码从1开始计算）

3、当总页码数超出9页时，增加快速跳转功能，可输入的最大值为总页码数

4、增加总页数以及总记录数显示

5、对原默认First,Prev,Next,Last部分的文本进行扩展，支持用指定文本替换此部分默认内容

以下是修改后的js，包含原js版本说明：

/*
* jQuery pager plugin
* Version 1.0 (12/22/2008)
* @requires jQuery v1.2.6 or later
*
* Example at: http://jonpauldavies.github.com/JQuery/Pager/PagerDemo.html
*
* Copyright (c) 2008-2009 Jon Paul Davies
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
* 
* Read the related blog post and contact the author at http://www.j-dee.com/2008/12/22/jquery-pager-plugin/
*
* This version is far from perfect and doesn't manage it's own state, therefore contributions are more than welcome!
*
* Usage: .pager({ pagenumber: 1, pagecount: 15, buttonClickCallback: PagerClickTest });
*
* Where pagenumber is the visible page number
*       pagecount is the total number of pages to display
*       buttonClickCallback is the method to fire when a pager button is clicked.
*
* buttonClickCallback signiture is PagerClickTest = function(pageclickednumber) 
* Where pageclickednumber is the number of the page clicked in the control.
*
* The included Pager.CSS file is a dependancy but can obviously tweaked to your wishes
* Tested in IE6 IE7 Firefox & Safari. Any browser strangeness, please report.
*/
(function($) {$.fn.pager = function(options) {var opts = $.extend({}, $.fn.pager.defaults, options);var pgcount = getPageCount(opts.recordcount, opts.pagesize);return this.each(function() {// empty out the destination element and then render out the pager with the supplied options$(this).empty().append(renderpager(parseInt(opts.pagenumber), pgcount, opts.recordcount, opts.buttonClickCallback,opts.firsttext, opts.prevtext, opts.nexttext, opts.lasttext, opts.recordtext, opts.gotext));// specify correct cursor activity$(' li', this).mouseover(function() { document.body.style.cursor = "pointer"; }).mouseout(function() { document.body.style.cursor = "auto"; });});};function getPageCount(totalCount, pageSize) {var pageCount = 0;pageCount = parseInt(totalCount / pageSize);if (totalCount % pageSize > 0) {pageCount++;}return pageCount;}// render and return the pager with the supplied optionsfunction renderpager(pagenumber, pagecount, recordcount, buttonClickCallback, firsttext, prevtext, nexttext, lasttext, recordtext, gotext) {// setup $pager to hold rendervar $pager = $('<ul class="pages"></ul>');// add in the previous and next buttons$pager.append(renderButton('first', firsttext, pagenumber, pagecount, buttonClickCallback)).append(renderButton('prev', prevtext, pagenumber, pagecount, buttonClickCallback));// pager currently only handles 10 viewable pages ( could be easily parameterized, maybe in next version ) so handle edge casesvar startPoint = 1;var endPoint = 9;if (pagenumber > pagecount) {pagenumber = pagecount;}if (pagenumber > 4) {startPoint = pagenumber - 4;endPoint = pagenumber + 4;}if (endPoint > pagecount) {startPoint = pagecount - 8;endPoint = pagecount;}if (startPoint < 1) {startPoint = 1;}// loop thru visible pages and render buttonsfor (var page = startPoint; page <= endPoint; page++) {var currentButton = $('<li class="page-number">' + (page) + '</li>');page == pagenumber ? currentButton.addClass('pgCurrent') : currentButton.click(function() { buttonClickCallback(this.firstChild.data); });currentButton.appendTo($pager);}// render in the next and last buttons before returning the whole rendered control back.$pager.append(renderButton('next', nexttext, pagenumber, pagecount, buttonClickCallback)).append(renderButton('last', lasttext, pagenumber, pagecount, buttonClickCallback));if (pagecount > 9) {$pager.append('<li class="pgText"><input tyle="text" class="iptGo" /><span class="spGo">' + gotext + '</span></li>');$('.iptGo', $pager).change(function() {var num = parseInt($(this).val());if (num && num > 0) {if (num > pagecount) {num = pagecount;}$(this).val(num);}else {$(this).val('');}}).keyup(function() { $(this).change(); });$('.spGo', $pager).click(function() {var num = $('.iptGo', $pager).val();if (num != '') {buttonClickCallback(num);}});}if (recordtext != '') {$pager.append('<li class="pgText">' + recordtext.replace(/\{0\}/g, pagecount).replace(/\{1\}/g, recordcount) + '</li>');}return $pager;}// renders and returns a 'specialized' button, ie 'next', 'previous' etc. rather than a page number buttonfunction renderButton(buttonLabel, buttonText, pagenumber, pagecount, buttonClickCallback) {var $Button = $('<li class="pgNext">' + buttonText + '</li>');var destPage = 1;// work out destination page for required button typeswitch (buttonLabel) {case "first":destPage = 1;break;case "prev":destPage = pagenumber - 1;break;case "next":destPage = pagenumber + 1;break;case "last":destPage = pagecount;break;}// disable and 'grey' out buttons if not needed.if (buttonLabel == "first" || buttonLabel == "prev") {pagenumber <= 1 ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });}else {pagenumber >= pagecount ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });}return $Button;}// pager defaults. hardly worth bothering with in this case but used as placeholder for expansion in the next version$.fn.pager.defaults = {pagenumber: 1,recordcount: 0,pagesize: 10,firsttext: 'first',//显示的第一页文本prevtext: 'prev',//显示的前一页文本nexttext: 'next',//显示的下一页文本lasttext: 'last',//显示的最后一页文本gotext: 'go',//显示的快速跳转文本recordtext: ''//显示记录数，为空时不显示，否则按照占位符显示文本，{0}表示总页数，{1}表示总记录数};})(jQuery);

以下是该插件对应的css部分，.jqpager是要应用插件的容器

.jqpager ul.pages {
display:block;
border:none;
text-transform:uppercase;
margin:2px 0 15px 2px;
padding:0;
}.jqpager ul.pages li {
list-style:none;
float:left;
border:1px solid #ccc;
text-decoration:none;
margin:0 5px 0 0;
padding:5px;
}.jqpager ul.pages li:hover {
border:1px solid #003f7e;
}.jqpager ul.pages li.pgEmpty {
border:1px solid #aaa;
color:#aaa;
cursor:default;
}.jqpager ul.pages li.pgText 
{border:none;cursor:default;
}.jqpager ul.pages li.page-number
{min-width:15px;text-align:center;
}.jqpager ul.pages li.pgCurrent {
border:1px solid #003f7e;
color:#000;
font-weight:700;
background-color:#eee;
}.jqpager input.iptGo
{width:30px;border:1px solid #ccc;margin:-2px 0px 0px 0px;height:18px;vertical-align:middle;
}
.jqpager span.spGo
{cursor:pointer;margin-left:2px;
}

以下是最终的效果