一步步打造自己的分页控件3

仔细查看大型网站51aspx,上面的分页静态代码，发现类似下面的结构

  <div class=green> 
2 <a href="?flag=first"><span >First</span></a>
3 <a href="?flag=pre"><span>Pre</span></a>
4 <a href="?pager=1"><span class=current>1</span></a>
5 <a href="?pager=2"><span>2</span></a>

6 <a href="?pager=3"><span>3</span></a>

7 <a href="?pager=4"><span>4</span></a>

8 <a href="?pager=5"><span>5</span></a>  

9 <a href="#"><span>……</span></a> 

10 <a href="?flag=next"><span>Next</span></a>

11 <a href="?flag=last"><span>Last</span></a>

12 <input type="text" value="1"/>

13 <input  type="button" value="Go" onclick="go()"/></div>
14 </div>

仔细分析发现它们的分页方式是通过改变url传递的参数，从而动态改变当前页码，因此想到了用request.querystring方法获取传递的参数，我当时考虑到分页有文字和数字，因此用了两个参数flag,pager,然后我将代码封装在一个类文件里面，其中数字按钮是动态生成的

先看看生成分页静态代码

 1 #region 输出分页html
 2 
 3         /// <summary>
 4         /// 输出的分页html
 5         /// </summary>
 6         /// <returns>返回字符型</returns>
 7         public string rendHtml()
 8         {
 9             StringBuilder sb = new StringBuilder();
10             sb.Append("<div class=" + cssClass + ">");
11             sb.Append(" <a href=\"?flag=first\"><span >" + first + "</span></a>");
12             sb.Append("<a href=\"?flag=pre\"><span>" + pre + "</span></a>");
13             //生成第一页
14             if (pageIndex == 1)
15             {
16                 sb.Append("<a href=\"?pager=1\"><span class=" + cssCurrent + ">1</span></a>");
17                 for (int i = 1; i < numberCount; i++)
18                 {
19                     sb.Append("<a href=\"?pager=" + (i + 1) + "\"><span>" + (i + 1) + "</span></a>");
20                 }
21                 sb.Append("  <a href=\"#\"><span>……</span></a>");
22             }
23             //生成其他页
24             if (pageIndex > 1 && pageIndex < pageAll)
25             {
26                 // int first = (pageIndex - 1) * numberCount+1; 
27                 int firstpage = pageIndex;
28                 int j = 3;
29                 sb.Append("<a href=\"?pager=" + firstpage + "\"><span class=" + cssCurrent + ">" + firstpage + "</span></a>");
30 
31                 for (int i = firstpage + 1; i < firstpage + numberCount; i++)
32                 {
33                     sb.Append("<a href=\"?pager=" + i + "\"><span>" + i + "</span></a>");
34                     j = j + 1;
35                 }
36                 sb.Append("  <a href=\"#\"><span>……</span></a>");
37             }
38             if (pageIndex == pageAll)//如果为最后一页
39             {
40                 int firstpage = pageIndex - 4;
41                 int j = 3;
42                 sb.Append("<a href=\"?pager=" + firstpage + "\"><span class=" + cssCurrent + ">" + firstpage + "</span></a>");
43 
44                 for (int i = firstpage + 1; i < firstpage + numberCount; i++)
45                 {
46                     sb.Append("<a href=\"?pager=" + i + "\"><span>" + i + "</span></a>");
47                     j = j + 1;
48                 }
49                 sb.Append("  <a href=\"#\"><span>……</span></a>");
50             }
51             //生成下一页和末页
52             sb.Append(" <a href=\"?flag=next\"><span>" + next + "</span></a>");
53             sb.Append(" <a href=\"?flag=last\"><span>" + last + "</span></a>");
54             sb.Append("<input type=\"text\" value=\"1\"/>");
55             sb.Append("<input  type=\"button\" value=\"Go\" onclick=\"go()\"/>");
56             sb.Append("</div>");
57             return sb.ToString();
58         }
59 
60         #endregion

通过点击a链接改变当前的pageIndex页码

 1   #region 获取分页url
 2         //点击分页
 3         private int getPageIndex()
 4         {
 5             //第一次加载时
 6             if (Request.QueryString["pager"] == null && Request.QueryString["flag"] == null)
 7             {
 8                 pageIndex = 1;
 9                 return pageIndex;
10             }
11             //第二种情况首页，上一页，下一页，末页
12             if (Request.QueryString["pager"] == null && Request.QueryString["flag"] != null)
13             {
14                 flag = Request.QueryString["flag"].ToString();
15                 if (flag == "first")//首页
16                 {
17                     pageIndex = 1;
18                     return pageIndex;
19                 }
20                 if (flag == "pre")//上一页
21                 {
22                     pageIndex = pageIndex - 1;
23                     if (pageIndex > 0)
24                     {
25                         return pageIndex;
26                     }
27                     if (pageIndex <= 0)
28                     {
29                         pageIndex = 1;
30                         return pageIndex;
31                     }
32                 }
33                 if (flag == "next")//下一页
34                 {
35                     pageIndex = pageIndex + 1;
36                     if (pageIndex <= pageAll)//如果等于末页
37                     {
38                         return pageIndex;
39                     }
40                     if (pageIndex > pageAll)//如果等于末页
41                     {
42                         pageIndex = pageAll;
43                         return pageIndex;
44                     }
45                 }
46                 if (flag == "last")//末页
47                 {
48                     pageIndex = pageAll;
49                     return pageIndex;
50                 }
51             }//end 2
52             //第三种 中间页
53             if (Request.QueryString["pager"] != null && Request.QueryString["flag"] == null)
54             {
55                 pageIndex = Convert.ToInt32(Request.QueryString["pager"].ToString());
56                 if (pageIndex == 1)//第一页
57                 {
58                     return pageIndex;
59                 }
60 
61                 if (pageIndex > 1 && pageIndex <= pageAll)//中间页
62                 {
63                     return pageIndex;
64                 }
65             }
66             return pageIndex;
67             //end 3
68         }
69         #endregion

分页属性代码如下：可以改变当前div的样式类名，上一页 下一页，首页，末页，显示的数字个数

 1  #region 属性
 2 
 3         private int pageSize = 10;//每页大小
 4         /// <summary>
 5         /// 每页显示数量
 6         /// </summary>
 7         public int PageSize { get { return pageSize; } set { pageSize = value; } }
 8 
 9         private static int pageIndex = 1;//当前页索引
10         /// <summary>
11         /// 页索引
12         /// </summary>
13         //public static int PageIndex { get { return pageIndex; } set { pageIndex=value;} }
14         public int CurrentPageIndex { get { return getPageIndex(); } }//当前页
15 
16 
17         private int numberCount = 5;//显示的数字个数
18         /// <summary>
19         /// 每页显示数量
20         /// </summary>
21         public int NumberCount { get { return numberCount; } set { numberCount = value; } }
22 
23         private int pageAll = 1;//总页数
24         /// <summary>
25         /// 总页数
26         /// </summary>
27         public int PageAll { get { return pageAll; } set { pageAll = value; } }
28 
29         private string flag = "first";//页标记
30         private HttpRequest Request { get { return HttpContext.Current.Request; } }
31 
32         private string cssClass = "green";//div类名称
33         /// <summary>
34         /// 分页div类名
35         /// </summary>
36         public string CssClass { get { return cssClass; } set { cssClass = value; } }
37 
38         private string cssCurrent = "current";
39         /// <summary>
40         /// 点击后显示样式
41         /// </summary>
42         public string CssCurrent { get { return cssCurrent; } set { cssCurrent = value; } }
43 
44         private string first = "首页";
45         /// <summary>
46         /// 首页显示的内容
47         /// </summary>
48         public string First { get { return first; } set { first = value; } }
49 
50         private string pre = "上一页";
51         /// <summary>
52         /// 上一页显示的内容
53         /// </summary>
54         public string Pre { get { return pre; } set { pre = value; } }
55 
56         private string next = "下一页";
57         /// <summary>
58         /// 下一页显示的内容
59         /// </summary>
60         public string Next { get { return next; } set { next = value; } }
61 
62         private string last = "末页";
63         /// <summary>
64         /// 末页显示的内容
65         /// </summary>
66         public string Last { get { return last; } set { last = value; } }
67         #endregion

 全部分页的代码如下：

  1 using System;
  2 using System.Text;
  3 using System.Web;
  4 namespace netPager
  5 {
  6     /// <summary>
  7     /// 自定义分页控件
  8     /// </summary>
  9     public class lyPager
 10     {
 11         #region 属性
 12 
 13         private int pageSize = 10;//每页大小
 14         /// <summary>
 15         /// 每页显示数量
 16         /// </summary>
 17         public int PageSize { get { return pageSize; } set { pageSize = value; } }
 18 
 19         private static int pageIndex = 1;//当前页索引
 20         /// <summary>
 21         /// 页索引
 22         /// </summary>
 23         //public static int PageIndex { get { return pageIndex; } set { pageIndex=value;} }
 24         public int CurrentPageIndex { get { return getPageIndex(); } }//当前页
 25 
 26 
 27         private int numberCount = 5;//显示的数字个数
 28         /// <summary>
 29         /// 每页显示数量
 30         /// </summary>
 31         public int NumberCount { get { return numberCount; } set { numberCount = value; } }
 32 
 33         private int pageAll = 1;//总页数
 34         /// <summary>
 35         /// 总页数
 36         /// </summary>
 37         public int PageAll { get { return pageAll; } set { pageAll = value; } }
 38 
 39         private string flag = "first";//页标记
 40         private HttpRequest Request { get { return HttpContext.Current.Request; } }
 41 
 42         private string cssClass = "green";//div类名称
 43         /// <summary>
 44         /// 分页div类名
 45         /// </summary>
 46         public string CssClass { get { return cssClass; } set { cssClass = value; } }
 47 
 48         private string cssCurrent = "current";
 49         /// <summary>
 50         /// 点击后显示样式
 51         /// </summary>
 52         public string CssCurrent { get { return cssCurrent; } set { cssCurrent = value; } }
 53 
 54         private string first = "首页";
 55         /// <summary>
 56         /// 首页显示的内容
 57         /// </summary>
 58         public string First { get { return first; } set { first = value; } }
 59 
 60         private string pre = "上一页";
 61         /// <summary>
 62         /// 上一页显示的内容
 63         /// </summary>
 64         public string Pre { get { return pre; } set { pre = value; } }
 65 
 66         private string next = "下一页";
 67         /// <summary>
 68         /// 下一页显示的内容
 69         /// </summary>
 70         public string Next { get { return next; } set { next = value; } }
 71 
 72         private string last = "末页";
 73         /// <summary>
 74         /// 末页显示的内容
 75         /// </summary>
 76         public string Last { get { return last; } set { last = value; } }
 77         #endregion
 78 
 79         #region 获取分页url
 80         //点击分页
 81         private int getPageIndex()
 82         {
 83             //第一次加载时
 84             if (Request.QueryString["pager"] == null && Request.QueryString["flag"] == null)
 85             {
 86                 pageIndex = 1;
 87                 return pageIndex;
 88             }
 89             //第二种情况首页，上一页，下一页，末页
 90             if (Request.QueryString["pager"] == null && Request.QueryString["flag"] != null)
 91             {
 92                 flag = Request.QueryString["flag"].ToString();
 93                 if (flag == "first")//首页
 94                 {
 95                     pageIndex = 1;
 96                     return pageIndex;
 97                 }
 98                 if (flag == "pre")//上一页
 99                 {
100                     pageIndex = pageIndex - 1;
101                     if (pageIndex > 0)
102                     {
103                         return pageIndex;
104                     }
105                     if (pageIndex <= 0)
106                     {
107                         pageIndex = 1;
108                         return pageIndex;
109                     }
110                 }
111                 if (flag == "next")//下一页
112                 {
113                     pageIndex = pageIndex + 1;
114                     if (pageIndex <= pageAll)//如果等于末页
115                     {
116                         return pageIndex;
117                     }
118                     if (pageIndex > pageAll)//如果等于末页
119                     {
120                         pageIndex = pageAll;
121                         return pageIndex;
122                     }
123                 }
124                 if (flag == "last")//末页
125                 {
126                     pageIndex = pageAll;
127                     return pageIndex;
128                 }
129             }//end 2
130             //第三种 中间页
131             if (Request.QueryString["pager"] != null && Request.QueryString["flag"] == null)
132             {
133                 pageIndex = Convert.ToInt32(Request.QueryString["pager"].ToString());
134                 if (pageIndex == 1)//第一页
135                 {
136                     return pageIndex;
137                 }
138 
139                 if (pageIndex > 1 && pageIndex <= pageAll)//中间页
140                 {
141                     return pageIndex;
142                 }
143             }
144             return pageIndex;
145             //end 3
146         }
147         #endregion
148 
149         #region 输出分页html
150 
151         /// <summary>
152         /// 输出的分页html
153         /// </summary>
154         /// <returns>返回字符型</returns>
155         public string rendHtml()
156         {
157             StringBuilder sb = new StringBuilder();
158             sb.Append("<div class=" + cssClass + ">");
159             sb.Append(" <a href=\"?flag=first\"><span >" + first + "</span></a>");
160             sb.Append("<a href=\"?flag=pre\"><span>" + pre + "</span></a>");
161             //生成第一页
162             if (pageIndex == 1)
163             {
164                 sb.Append("<a href=\"?pager=1\"><span class=" + cssCurrent + ">1</span></a>");
165                 for (int i = 1; i < numberCount; i++)
166                 {
167                     sb.Append("<a href=\"?pager=" + (i + 1) + "\"><span>" + (i + 1) + "</span></a>");
168                 }
169                 sb.Append("  <a href=\"#\"><span>……</span></a>");
170             }
171             //生成其他页
172             if (pageIndex > 1 && pageIndex < pageAll)
173             {
174                 // int first = (pageIndex - 1) * numberCount+1; 
175                 int firstpage = pageIndex;
176                 int j = 3;
177                 sb.Append("<a href=\"?pager=" + firstpage + "\"><span class=" + cssCurrent + ">" + firstpage + "</span></a>");
178 
179                 for (int i = firstpage + 1; i < firstpage + numberCount; i++)
180                 {
181                     sb.Append("<a href=\"?pager=" + i + "\"><span>" + i + "</span></a>");
182                     j = j + 1;
183                 }
184                 sb.Append("  <a href=\"#\"><span>……</span></a>");
185             }
186             if (pageIndex == pageAll)//如果为最后一页
187             {
188                 int firstpage = pageIndex - 4;
189                 int j = 3;
190                 sb.Append("<a href=\"?pager=" + firstpage + "\"><span class=" + cssCurrent + ">" + firstpage + "</span></a>");
191 
192                 for (int i = firstpage + 1; i < firstpage + numberCount; i++)
193                 {
194                     sb.Append("<a href=\"?pager=" + i + "\"><span>" + i + "</span></a>");
195                     j = j + 1;
196                 }
197                 sb.Append("  <a href=\"#\"><span>……</span></a>");
198             }
199             //生成下一页和末页
200             sb.Append(" <a href=\"?flag=next\"><span>" + next + "</span></a>");
201             sb.Append(" <a href=\"?flag=last\"><span>" + last + "</span></a>");
202             sb.Append("<input type=\"text\" value=\"1\"/>");
203             sb.Append("<input  type=\"button\" value=\"Go\" onclick=\"go()\"/>");
204             sb.Append("</div>");
205             return sb.ToString();
206         }
207 
208         #endregion
209     }
210 }

前台aspx代码调用：样式和js文件

 1  <link href="css/pager.css" rel="stylesheet" type="text/css" />
 2     <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
 3     <script type="text/javascript">
 4         $(function () {
 5             $(".green span:eq(2)").addClass("current");    
 6                  var pageIndex=<%=Request.QueryString["pager"]%>
 7                  if (pageIndex>1) {
 8                              $(".green input:eq(0)").val(pageIndex);
 9                            }
10                   })
11                    function go()
12                    {
13                             var index = $(".green input:eq(0)").val();
14                             if (1<index&&index<=<%=pageTotal%>) {
15                             window.location.href("分页5.aspx?pager="+index);   
16                                }       
17                    } 
18     </script>

分页代码：

 <div>
2         <p>
3             分页测试</p>
4         <div style="text-align: center;">
5             <asp:GridView ID="GridView1" runat="server">
6             </asp:GridView>
7         </div>
8         <%=pageHtml%>
9     </div>

调用分页类实现分页：

 1 using System;
 2 using netPager;
 3 
 4 namespace Pager
 5 {
 6     public partial class 分页5 : System.Web.UI.Page
 7     {
 8         lyPager myPager = new lyPager();
 9         sqlHelper sh = new sqlHelper();
10         protected void Page_Load(object sender, EventArgs e)
11         {
12             if (!IsPostBack)
13             {
14                 initPager();
15                 this.GridView1.DataSource = sh.getList(myPager.PageSize, myPager.CurrentPageIndex - 1, "");
16                 this.GridView1.DataBind();
17                 pageHtml = myPager.rendHtml();
18                 pageTotal = myPager.PageAll;
19             }
20         }
21         //输出的html
22         public string pageHtml { get; set; }
23         //总页数
24         public int pageTotal { get; set; }
25         //初始化分页控件
26         public void initPager()
27         {
28 
29             myPager.PageSize = 10;
30             myPager.PageAll = sh.getAllPage() / myPager.PageSize;
31             myPager.NumberCount = 5;
32 
33             myPager.First = "First";
34             myPager.Pre = "Pre";
35             myPager.Next = "Next";
36             myPager.Last = "Last";
37 
38             //样式类名赋值   
39         }
40     }
41 }