分页代码

 

  1/**//* ***********************************************
  2* Copyright:       ? 2001-2009
  3* Author:          作者:MILD
  4* Link:            http://www.***.com
  5* Created Time:    2009-9-19 19:52:14
  6* Object Name:     Mild.Core.PageListFactory
  7* FileName:        PageListFactory
  8* Description:     该类的描述、功用、依赖性
  9* EditHistory:     修改记录
 10* ***********************************************/
 11
 12/**//*
 13附上css样式
 14.pager{line-height:130%; margin:50px auto; width:80%; height:auto;}
 15.pager input{width:30px;border:solid 1px #dbdbdb;}
 16.pager a{padding:3px 5px; border:solid 1px #dbdbdb;}
 17.pager a:link,.pager a:visited{text-decoration:none;color:#666; margin-right:3px;}
 18.pager a.page-select{background:#000;color:#fff;font-weight:bold;}
 19*/
 20using System;
 21using System.Text;
 22using System.Web;
 23
 24namespace Mild.Common.Core
 25{
 26    /**//// <summary>
 27    /// 类 PageListFactory 的说明
 28    /// </summary>
 29    public class PageListFactory
 30    {
 31        /**//// <summary>
 32        /// 页码项模版
 33        /// </summary>
 34        public string NumItem = "<a href='{0}'>{1}</a>";
 35
 36        /**//// <summary>
 37        /// 当前页码项模版
 38        /// </summary>
 39        public string CurrentNumItem = "<a class='page-select' href='javascript:void(0)'>{0}</a>";
 40
 41        /**//// <summary>
 42        /// 盒子开始的标签
 43        /// </summary>
 44        public string BoxBeginTag = "<div class='pager'>";
 45
 46        /**//// <summary>
 47        /// 盒子结束的标签
 48        /// </summary>
 49        public string BoxEndTag = "</div>";
 50
 51        /**//// <summary>
 52        /// 记录总数
 53        /// </summary>
 54        public int Total = 1;
 55
 56        /**//// <summary>
 57        /// 页大小
 58        /// </summary>
 59        public int PageSize = 1;
 60
 61        /**//// <summary>
 62        /// 当前页
 63        /// </summary>
 64        public int CurrentPage = 1;
 65
 66        /**//// <summary>
 67        /// 页数
 68        /// </summary>
 69        public int PageCount = 0;
 70
 71        /**//// <summary>
 72        /// 当当前页大于该数字则显示更多
 73        /// </summary>
 74        public int MoreFlag = 4;
 75
 76        /**//// <summary>
 77        /// 传递过来的当前页参数名称
 78        /// </summary>
 79        public string QueryStringName = "page";
 80
 81        /**//// <summary>
 82        /// 更多的链接
 83        /// </summary>
 84        public string MoreLink = "<a href='{0}'>..</a>";
 85
 86        /**//// <summary>
 87        /// URL 模版
 88        /// </summary>
 89        private string UrlWithoutPage = string.Empty;
 90
 91        /**//// <summary>
 92        /// URL 地址上的参数模版
 93        /// </summary>
 94        private string UrlParameters = string.Empty;
 95
 96        /**//// <summary>
 97        /// URL 重写的表达式
 98        /// </summary>
 99        private string UrlRewritePatten = string.Empty;
100
101        /**//// <summary>
102        /// 开始页码
103        /// </summary>
104        private int StartNum = 1;
105
106        /**//// <summary>
107        /// 结束页码
108        /// </summary>
109        private int EndNum = 0;
110
111
112        /**//// <summary>
113        /// 首页文本
114        /// </summary>
115        public string FirstPageText = "<a href='{0}'>首页</a>";
116
117        /**//// <summary>
118        /// 上一页文本
119        /// </summary>
120        public string PreviouPageText = "<a href='{0}'>上一页</a>";
121
122        /**//// <summary>
123        /// 下一页文本
124        /// </summary>
125        public string NextPageText = "<a href='{0}'>下一页</a>";
126
127        /**//// <summary>
128        /// 末页文本
129        /// </summary>
130        public string LastPageText = "<a href='{0}'>末页</a>";
131
132        /**//// <summary>
133        /// 更多页 - 向前
134        /// </summary>
135        public string MorePreviouText = "<a href='{0}'>..</a>";
136
137        /**//// <summary>
138        /// 更多页 - 向后
139        /// </summary>
140        public string MoreNextText = "<a href='{0}'>..</a>";
141
142        /**//// <summary>
143        /// 输入框
144        /// </summary>
145        public string InputToPageText = "<input type='text' onkeydown='_m_goto_page(event,this)' /><input type='button' value='转到' onclick='_m_goto_page(event,this)' /><script>function _m_goto_page(e,o){var ipts=o.parentNode.getElementsByTagName(\"input\");if(o.type=='text'){var kcode;if(window.event){kcode=e.keyCode}else if(e.which){kcode=e.which}if(kcode==13){if(document.all){ipts[1].click()}else if(document.createEvent){var ev=document.createEvent('HTMLEvents');ev.initEvent('click',false,true);ipts[1].dispatchEvent(ev)}}return}var page=ipts[0].value;var p=/\\d+/;if(!p.test(page)){alert(\"页码输入错误\")}else if(page>{maxpage}){alert(\"页码超过总页数，请重新输入\");ipts[0].value=\"\"}else{location.href='{url}'+ipts[0].value}}</script>";
146
147        private PageListFactory() { }
148
149        /**//// <summary>
150        /// 构造函数
151        /// </summary>
152        /// <param name="page"></param>
153        /// <param name="pagesize"></param>
154        /// <param name="total"></param>
155        /// <param name="ptn"></param>
156        private PageListFactory(int page, int pagesize, int total, string ptn)
157        {
158            this.Total = total;
159            this.CurrentPage = page;
160            this.PageSize = pagesize;
161            this.PageCount = (int)Math.Ceiling(Total * 1.0 / PageSize);
162            this.UrlRewritePatten = ptn;
163
164            if (page > PageCount)
165            {
166                CurrentPage = PageCount;
167            }
168        }
169
170        private void PrepareInterzone()
171        {
172            int flag = 0;
173
174            if (CurrentPage > MoreFlag)
175            {
176                flag = (int)Math.Ceiling(CurrentPage * 1.0 / MoreFlag);
177
178                if (flag >= 2)
179                {
180                    StartNum = CurrentPage - MoreFlag;
181
182                    MorePreviouText = string.Format(MorePreviouText, UrlWithoutPage + QueryStringName + "=" + (CurrentPage - MoreFlag));
183                }
184                else
185                {
186                    MorePreviouText = "";
187                }
188            }
189            else
190            {
191                MorePreviouText = "";
192            }
193
194            int nflag = 0;
195
196            if (PageCount - CurrentPage > MoreFlag)
197            {
198                nflag = (int)Math.Ceiling((PageCount - CurrentPage) * 1.0 / MoreFlag);
199
200                if (nflag >= 2)
201                {
202                    EndNum = CurrentPage + MoreFlag;
203
204                    MoreNextText = string.Format(MoreNextText, UrlWithoutPage + QueryStringName + "=" + (CurrentPage + MoreFlag));
205                }
206                else
207                {
208                    MoreNextText = "";
209                }
210            }
211            else
212            {
213                EndNum = PageCount;
214
215                MoreNextText = "";
216            }
217        }
218
219        /**//// <summary>
220        /// 准备所有的参数
221        /// </summary>
222        private void Prepare()
223        {
224            this.UrlWithoutPage = MakeUrl();
225
226            PrepareInterzone();
227
228
229            if (CurrentPage == 1)
230            {
231                FirstPageText = string.Format(FirstPageText, "javascript:;");
232                PreviouPageText = string.Format(PreviouPageText, "javascript:;");
233            }
234            else
235            {
236                FirstPageText = string.Format(FirstPageText, UrlWithoutPage + QueryStringName + "=1");
237                PreviouPageText = string.Format(PreviouPageText, UrlWithoutPage + QueryStringName + "=" + (CurrentPage - 1));
238            }
239
240            if (CurrentPage == PageCount)
241            {
242                LastPageText = string.Format(LastPageText, "javascript:;");
243                NextPageText = string.Format(NextPageText, "javascript:;");
244            }
245            else
246            {
247                LastPageText = string.Format(LastPageText, UrlWithoutPage + QueryStringName + "=" + PageCount);
248                NextPageText = string.Format(NextPageText, UrlWithoutPage + QueryStringName + "=" + (CurrentPage + 1));
249            }
250        }
251
252        /**//// <summary>
253        /// 获取当前页面的URL，但不包含页码参数
254        /// </summary>
255        /// <returns></returns>
256        private string MakeUrl()
257        {
258            HttpRequest Request = HttpContext.Current.Request;
259            string Url = Request.Url.AbsolutePath.Replace("/", "") + "?";
260            string[] queryNames=Request.QueryString.AllKeys;
261            System.Collections.Generic.List<string> list = new System.Collections.Generic.List<string>();
262
263            string key = string.Empty;
264            string value = string.Empty;
265            for (int i = 0; i < queryNames.Length; i++)
266            {
267                key = queryNames[i];
268                value = Request.QueryString[key];
269                if (key == QueryStringName||value=="")
270                {
271                    continue;
272                }
273                list.Add(key + "=" + value);
274            }
275
276            string paras = Url + string.Join("&", list.ToArray());
277
278            if (list.Count > 0)
279            {
280                paras += "&";
281            }
282
283            return paras;
284        }
285
286        public string CreateHtml()
287        {
288            Prepare();
289
290            StringBuilder sb = new StringBuilder();
291            sb.AppendLine(BoxBeginTag);
292            sb.AppendLine(FirstPageText);
293            sb.AppendLine(PreviouPageText);
294            sb.AppendLine(MorePreviouText);
295            for (int i = StartNum; i < EndNum+1; i++)
296            {
297                if (i == CurrentPage)
298                {
299                    sb.AppendFormat(CurrentNumItem, i.ToString());
300                    continue;
301                }
302
303                sb.AppendFormat(NumItem, UrlWithoutPage + QueryStringName + "=" + i, i.ToString());
304            }
305            sb.AppendLine(MoreNextText);
306            sb.AppendLine(NextPageText);
307            sb.AppendLine(LastPageText);
308
309            if (PageCount > 20)
310            {
311                sb.Append(InputToPageText.Replace("{maxpage}", PageCount.ToString()).Replace("{url}", UrlWithoutPage + "page="));
312            }
313
314            sb.AppendLine(BoxEndTag);
315            return sb.ToString();
316        }
317
318        /**//// <summary>
319        /// 获取分页html
320        /// </summary>
321        /// <param name="page">当前页</param>
322        /// <param name="pagesize">页大小(几条记录一页)</param>
323        /// <param name="total">总记录数</param>
324        /// <param name="ptn">未作,URL重写表达式</param>
325        /// <returns></returns>
326        public static string GetHtml(int page, int pagesize, int total, string ptn)
327        {
328            PageListFactory factory = new PageListFactory(page, pagesize, total, ptn);
329
330            return factory.CreateHtml();
331        }
332
333        /**//// <summary>
334        /// 获取分页html
335        /// </summary>
336        /// <param name="page">当前页</param>
337        /// <param name="pagesize">页大小(几条记录一页)</param>
338        /// <param name="total">总记录数</param>
339        /// <returns></returns>
340        public static string GetHtml(int page, int pagesize, int total)
341        {
342            return GetHtml(page, pagesize, total, "");
343        }
344    }
345}