翻页控件

mac2022-06-30 19

/**/ /// <summary> /// Summary description for Pager. /// </summary> public class Pager : BaseControl, System.Web.UI.IPostBackEventHandler { public Pager() { this.Load += new EventHandler(Pager_Load); } private void Pager_Load(object sender,EventArgs e) { } protected override void Render(HtmlTextWriter output) { if(this.PageCount == 0) { return; } if(LinkedPager!=null) { Pager linkedPager = (Pager)Parent.FindControl(LinkedPager); if(linkedPager==null) throw new Exception(string.Format("Failed to link pager to '{0}'.",LinkedPager)); linkedPager.Render(output); return; } //显示页次 output.WriteLine("<span>"); output.WriteLine("页次：{0}/{1} ",CurrentPageIndex+1,PageCount); //跳转 output.WriteLine("<script LANGUAGE='javascript'>"); output.WriteLine("function formHandler()"); output.WriteLine("{ "); output.WriteLine("var xx = document.getElementById('Select1');"); output.WriteLine("var URL = xx.options[xx.selectedIndex].value; "); output.WriteLine("window.location.href = URL; "); output.WriteLine("} "); output.WriteLine("</script> "); output.WriteLine("转到第<select NAME='site' SIZE='1' onChange='formHandler()' ID='Select1'>"); for(int i= 0;i<PageCount; i++) { if(i== CurrentPageIndex) output.WriteLine("<option value={0} selected >{1}</option>", Page.GetPostBackClientHyperlink(this,i.ToString()),i+1); else output.WriteLine("<option value={0}>{1}</option>", Page.GetPostBackClientHyperlink(this,i.ToString()),i+1); } output.WriteLine("</select>页 "); output.WriteLine("</span>"); //显示上下翻页 int iLastPageN0 = CurrentPageIndex-1; int iNextPageN0 = CurrentPageIndex+1; if(CurrentPageIndex<=0) { //output.WriteLine("<a href=\"{0}\" style='color:black;'>上页</a>",Page.GetPostBackClientHyperlink(this,CurrentPageIndex.ToString())); } else { output.WriteLine("<a href=\"{0}\" style='color:#0000FF;'>上页</a>",Page.GetPostBackClientHyperlink(this,iLastPageN0.ToString())); } if(CurrentPageIndex>0&CurrentPageIndex<(PageCount-1)) { output.WriteLine(" | "); } if(CurrentPageIndex>=(PageCount-1)) { //output.WriteLine("<a href=\"{0}\" style='color:black;'>下页</a> ",Page.GetPostBackClientHyperlink(this,CurrentPageIndex.ToString())); } else { output.WriteLine("<a href=\"{0}\" style='color:#0000FF;'>下页</a> ",Page.GetPostBackClientHyperlink(this,iNextPageN0.ToString())); } } public int Count { get { if(ViewState["Count"]!=null) return (int)ViewState["Count"]; else return 0; } set { ViewState["Count"] = value; } } public int CurrentPageIndex { get { if(ViewState["CurrentPageIndex"]!=null) return (int)ViewState["CurrentPageIndex"]; else return 0; } set { ViewState["CurrentPageIndex"] = value; } } public int PageSize { get { if(ViewState["PageSize"]!=null) return (int)ViewState["PageSize"]; else return 20; } set { ViewState["PageSize"] = value; } } public int PageCount { get { return (int)Math.Ceiling((double)Count/PageSize); } } public string LinkedPager { get { return (string)ViewState["LinkedPager"]; } set { ViewState["LinkedPager"] = value; } } IPostBackEventHandler#region IPostBackEventHandler public event EventHandler PageChange; public void RaisePostBackEvent(string eventArgument) { if(PageChange!=null) { CurrentPageIndex = int.Parse(eventArgument); PageChange(this,new EventArgs()); } } #endregion } 使用： private void Pager_PageChange( object sender, EventArgs e) { BindData(); } private void BindData() { DataSet ds = DB.board_layout(PageBoardID,PageUserID,PageCategoryID,PageForumID); if(ds.Tables["yaf_Forum"].Rows.Count>0) { ForumList.DataSource = ds.Tables["yaf_Forum"].Rows; SubForums.Visible = true; } //一页显示数据行数 Pager.PageSize = 20; int nCurrentPageIndex = Pager.CurrentPageIndex; int nPageSize = Pager.PageSize; DataTable dtTopics; dtTopics = DB.topic_list(PageForumID,nCurrentPageIndex*nPageSize,nPageSize,PageUserID,OrderType); int nRowCount = 0; if(dtTopics.Rows.Count>0) nRowCount = (int)dtTopics.Rows[0]["RowCount"]; int nPageCount = (nRowCount + nPageSize - 1) / nPageSize; Announcements.DataSource = dtTopics; DataBind(); //数据有多少页 Pager.Count = nRowCount; }

转载于:https://www.cnblogs.com/Elong/archive/2005/04/15/138338.html