简单 GridView AJAX 局部刷新分页例子@孟宪会

本文介绍了一个使用ASP.NET和AJAX实现的简单分页示例,通过C#和Access数据库展示了如何进行数据分页及局部刷新。该示例包括了从数据库中读取数据并展示在GridView控件上的过程。

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<%@ Page Language="C#" %>

<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
  
int PageIndex = 1;
  private String ConnectionString
= @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|MengXianHui.mdb;";
  public
int TotalCount = 0;
  public
int PageItem = 5;
  System.Data.DataView CreateDataSourceByXianhuiMeng()
  {
    Int32.TryParse(Request.QueryString[
"Page"], out PageIndex);
    OleDbCommand cmd;
    String sql;
    OleDbConnection cn
= new OleDbConnection(ConnectionString);
    cn.Open();
    
// 由于是 Access 数据库,我们只进行简单的分页。对于性能要求较高的地方,请自行采取其他方法,比如存储过程等。
    sql = "SELECT COUNT(*) FROM [Document]";
    cmd
= new OleDbCommand(sql, cn);

    
// 总的记录数
    TotalCount = Convert.ToInt32(cmd.ExecuteScalar());
    
//当前页的序号  
    if (PageIndex < 1) PageIndex = 1;
    
int PageCount = (int)Math.Ceiling((double)(TotalCount) / PageItem);
    
if (PageIndex > PageCount) PageIndex = PageCount;
    
int startRecord = (PageIndex - 1) * PageItem;

    sql
= "SELECT DocumentId,DocumentGuid,Title,CreateDate FROM [Document] ORDER BY [DocumentId] DESC";

    OleDbDataAdapter da
= new OleDbDataAdapter(sql, cn);
    DataSet ds
= new DataSet();
    da.Fill(ds, startRecord, PageItem,
"Document");
    cn.Close();
    
return ds.Tables[0].DefaultView;
  }


  protected
void Page_Load(object sender, EventArgs e)
  {
    
if (String.IsNullOrEmpty(Request.QueryString["Page"]))
    {
      
//首次加载显示页面内容,并进行初始化参数。
      CreateDataSourceByXianhuiMeng();
      Page.ClientScript.RegisterStartupScript(Page.GetType(),
"js", "Pager(1)", true);
    }
    
else
    {
      Response.ClearContent();
      GridView1.DataSource
= CreateDataSourceByXianhuiMeng();
      GridView1.DataBind();
      System.Text.StringBuilder sb
= new System.Text.StringBuilder();
      System.IO.StringWriter sw
= new System.IO.StringWriter(sb);
      HtmlTextWriter htw
= new HtmlTextWriter(sw);
      GridView1.RenderControl(htw);
      Response.Write(sb.ToString());
      Response.End();
    }

  }
  
/// 添加这个override void VerifyRenderingInServerForm(Control control),是为了避免出现
  /// 类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内。
  /// 的异常
  public override void VerifyRenderingInServerForm(Control control)
  { }

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>简单 AJAX 局部刷新分页例子</title>
<script type="text/javascript">
  
function GetData(p) {
    
var h = window.XMLHttpRequest ? new window.XMLHttpRequest() : new ActiveXObject("MSXML2.XMLHTTP");
    h.open(
"GET", '<%=Request.FilePath %>?Page=' + p + "&" + Date.parse(new Date()), true);
    h.onreadystatechange
= function() {
    
if (h.readyState == 4) {
      
if (h.status == 200) {
         document.getElementById(
"_Containter").innerHTML = h.responseText;
        }
      }
     }
    h.send(
null);
  }

  
///
  /// 具有分页功能的函数。
  ///
  function Pager(CurrentPage) {
    GetData(CurrentPage);
    
var TotalRows = <%=TotalCount %>;
    
var Step = 3;
    
var PageItem = <%=PageItem %>;
    
    
if (TotalRows < 1) {
      TotalPage
= 0;
    }
    
else {
      TotalPage
= Math.ceil(TotalRows / PageItem)
    }
    
var PagerContent = "" + TotalPage + " 页 每页 " + PageItem + "";
    
var leftStep = CurrentPage - Step;
    
var rightStep = CurrentPage + Step;
    
if (leftStep < 1) leftStep = 1;
    
if (rightStep > TotalPage) rightStep = TotalPage;
    
if (CurrentPage > 1) PagerContent += "<a href='#' onclick='Pager(1);return false;'>首页</a> <a href='' onclick='Pager(" + (CurrentPage - 1) + ");return false;'>上一页</a> "
    
for (var i = leftStep; i <= rightStep; i++) {
      
if (i == CurrentPage) {
        PagerContent
+= " <strong style='color:red'>" + i + "</strong>"
      }
      
else {
        PagerContent
+= " <a href='#' onclick='Pager(" + i + ");return false;'>" + i + "</a> "
      }
    }

    
if (rightStep < TotalPage) PagerContent += "<a href='' onclick='Pager(" + (CurrentPage + 1) + ");return false;'>下一页</a> <a href='' onclick='Pager(" + TotalPage + ");return false;'>末页</a>  "
    document.getElementById(
"_Pager1").innerHTML= document.getElementById("_Pager2").innerHTML = PagerContent;
  }
  alert(
"页面首次加载弹出的标记。")
</script>

</head>
<body>
  
<form id="form1" runat="server">
  
<div id="_Pager1" style="padding: 10px; text-align: center"></div>
    
<div id="_Containter">
      
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" Width="80%">
        
<HeaderStyle BackColor="#EEEEEE" />
        
<Columns>
          
<asp:BoundField DataField="DocumentId" />
          
<asp:HyperLinkField HeaderText="文章标题" DataNavigateUrlFields="DocumentGuid" DataTextField="Title"
            DataNavigateUrlFormatString
="http://dotnet.aspx.cc/article/{0}/read.aspx" />
          
<asp:BoundField HeaderText="发布时间" DataField="CreateDate" />
        
</Columns>
      
</asp:GridView>
    
</div>
    
<div id="_Pager2" style="padding: 10px; text-align: center"></div>
  
</form>
</body>
</html>

 

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