.Net子类
- NetSubClass:ASP.Net
在Asp.net编程的时候，经常会遇见这样的问题，比如：在一个DataGrid里编辑数据，DataGrid数据显示
很长，我们用鼠标把页面拉到下面进行编辑，编辑好数据提交后，页面又会滚动到最顶端，我们需要再
次滚动页面，找到刚才编辑的数据，好麻烦！现在简单了，定义一个ScrollPage类，把我们的
asp.net 页面的继承类修改为继承ScrollPage就OK了！简单吧！
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.UI;
namespace ScrollTemplate
{
public class TemplateScrollPage : System.Web.UI.Page
{
public TemplateScrollPage()
{
}
private bool m_UseScrollPersistence = true;
private string m_BodyID;
private string saveScrollPosition = "<script language='javascript'>function saveScrollPosition() {{document.forms[0].__SCROLLPOS.value = {0}.scrollTop;}}{0}.onscroll=saveScrollPosition;</script>";
private string setScrollPosition = "<script language='javascript'>function setScrollPosition() {{{0}.scrollTop =\"{1}\";}}{0}.onload=setScrollPosition;</script>";
public bool UseScrollPersistence
{
get
{
return m_UseScrollPersistence;
}
set
{
m_UseScrollPersistence = value;
}
}
public string BodyID
{
get
{
return m_BodyID;
}
set
{
m_BodyID = value;
}
}
protected override void OnPreRender(EventArgs e)
{
if (UseScrollPersistence)
{
RetainScrollPosition();
}
base.OnPreRender(e);
}
protected override void Render(HtmlTextWriter writer)
{
if ((UseScrollPersistence))
{
TextWriter tempWriter = new StringWriter();
base.Render(new HtmlTextWriter(tempWriter));
if ((BodyID == null))
{
writer.Write(Regex.Replace(tempWriter.ToString(), "<body", "<body id=\"thebody\" ", RegexOptions.IgnoreCase));
}
else
{
writer.Write(Regex.Replace(tempWriter.ToString(), "<body", "<body id=\" + m_BodyID + \"", RegexOptions.IgnoreCase));
}
}
else
{
base.Render(writer);
}
}
private void RetainScrollPosition()
{
this.Page.RegisterHiddenField("__SCROLLPOS", "0");
string s_bodyID;
if (BodyID == null)
{
s_bodyID = "thebody";
}
else
{
s_bodyID = BodyID;
}
RegisterStartupScript("saveScroll", string.Format(saveScrollPosition, s_bodyID));
if ((Page.IsPostBack))
{
RegisterStartupScript("setScroll", string.Format(setScrollPosition, s_bodyID, Request.Form["__SCROLLPOS"]));
}
}
}
}