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孟子E章 2012-09-21
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Gridview的例子，DataList也可以类似
GET 方式实现 GridView 跨页面多选
使用 POST 方式，使用控件很容易解决这个问题，但是 GET 方式，存储数据的方式有限，可以采取 Cookie 存储选择的数据，也可以使用 Ajax 到服务器端进行保存。对于超过Cookie限制的地方，采用 Ajax 是很好的方法。下面就是采取 Cookie 保存数据的例子。
ASPX 代码
GET 方式实现 GridView 跨页面多选
使用 POST 方式，使用控件很容易解决这个问题，但是 GET 方式，存储数据的方式有限，可以采取 Cookie 存储选择的数据，也可以使用 Ajax 到服务器端进行保存。对于超过Cookie限制的地方，采用 Ajax 是很好的方法。下面就是采取 Cookie 保存数据的例子。
ASPX 代码
<%@ Page Language="C#" Debug="false" %>
<%@ 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">
String Articles = String.Empty;
protected void Page_Load(object sender, EventArgs e)
{
if (Request.Cookies["ArticleId"]!=null) Articles = Request.Cookies["ArticleId"].Value;
Articles = Server.UrlDecode(Articles);
string xlsConnStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|MengxianHui.mdb";
OleDbConnection cn = new OleDbConnection(xlsConnStr);
cn.Open();
String sql = "SELECT Count(*) FROM [Document]";
OleDbCommand cmd = new OleDbCommand(sql, cn);
// 总的记录数
int TotalCount = Convert.ToInt32(cmd.ExecuteScalar());
//当前页的序号
int PageIndex = 1;
String page = Request.QueryString["Page"];
if (page == null) page = "1";
if (!Int32.TryParse(page, out PageIndex)) PageIndex = 1;
if (PageIndex < 1) PageIndex = 1;
//每页显示的数量
int PageItem = 5;
int startRecord = (PageIndex - 1) * PageItem;
sql = "SELECT [ArticleId],[Title],[CreateDate],[Author] FROM [Document] Order By [ArticleId] DESC";
OleDbDataAdapter da = new OleDbDataAdapter(sql, cn);
DataSet ds = new DataSet();
da.Fill(ds, startRecord, PageItem, "Document");
GridView1.DataSource = ds.Tables[0].DefaultView;
GridView1.DataBind();
BuildPagers(TotalCount, PageIndex, PageItem);
cn.Dispose();
}
private void BuildPagers(int TotalCountRecord, int CurrentPage, int PageItem)
{
int Step = 6;
int LeftNum = 0;
int RightNum = 0;
String PageUrl = "?";
int PageCount = (int)Math.Ceiling((double)(TotalCountRecord) / PageItem);
if (CurrentPage - Step < 1)
{
LeftNum = 1;
}
else
{
LeftNum = CurrentPage - Step;
}
if (CurrentPage + Step > PageCount)
{
RightNum = PageCount;
}
else
{
RightNum = CurrentPage + Step;
}
string OutPut = "";
for (int i = LeftNum; i <= RightNum; i++)
{
if (i == CurrentPage)
{
OutPut += "<span style='color:red'>" + i.ToString() + "</span> ";
}
else
{
OutPut += "<a href=\"" + PageUrl + "Page=" + i.ToString() + "\">" + i.ToString() + "</a> ";
}
}
if (CurrentPage > 1)
{
OutPut = "<a href='" + PageUrl + "Page=1'>首页</a> <a href=\"" + PageUrl + "Page=" + (CurrentPage - 1) + "\">上一页</a> " + OutPut;
}
if (CurrentPage < PageCount)
{
OutPut += " <a href=\"" + PageUrl + "Page=" + (CurrentPage + 1) + "\">下一页</a> <a href='" + PageUrl + "Page=" + PageCount + "'>末页</a>";
}
Pager.InnerHtml = OutPut;
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
String CurrentArticleId = DataBinder.Eval(e.Row.DataItem, "ArticleId").ToString();
CheckBox ArticleId = e.Row.FindControl("ArticleId") as CheckBox;
ArticleId.Attributes.Add("onclick", "SetArticleId(this," + CurrentArticleId + ")");
if (Articles.IndexOf("|" + CurrentArticleId + "|") > -1)
{
ArticleId.Checked = true;
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
String[] ids = Articles.Split('|');
for (int i = 0; i < ids.Length; i++)
{
if (!ids[i].Trim().Equals(String.Empty))
{
Response.Write("<li>" + ids[i]);
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>GET 方式实现 GridView 跨页面多选</title>
<script type="text/javascript">
function SetArticleId(o, i) {
if (o.checked) {
AddCookie(i)
}
else {
RemoveCookie(i)
}
}
function SetCookie(name, value) {
document.cookie = name + "=" + escape(value);
}
function GetCookie(name) {
if (document.cookie.length > 0) {
c_start = document.cookie.indexOf(name + "=");
if (c_start != -1) {
c_start = c_start + name.length + 1;
c_end = document.cookie.indexOf(";", c_start);
if (c_end == -1) c_end = document.cookie.length;
return unescape(document.cookie.substring(c_start, c_end));
}
}
return "";
}
function AddCookie(i) {
d = GetCookie("ArticleId");
if (d == "") d = "|";
if (d.indexOf("|" + i + "|") == -1) {
d += i + "|";
SetCookie("ArticleId", d);
}
}
function RemoveCookie(i) {
d = GetCookie("ArticleId");
var reg = new RegExp("\\|" + i + "\\|");
if (reg.test(d)) {
d = d.replace(reg, "|");
SetCookie("ArticleId", d);
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView ID="GridView1" runat="server" CellPadding="6"
ShowHeader="false" OnRowDataBound="GridView1_RowDataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="ArticleId" runat="server" /></ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<div id="Pager" runat="server"></div>
<asp:Button ID="Button1" runat="server" Text="查看所选择的ID"
onclick="Button1_Click" />
</form>
</body>
</html>孟子E章 2012-09-21
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记录到COOKIE中
