[推荐]防止页面滚动
自用小经验(1)--防止页面滚动
总结：
通过对引用的东西进行总结，形成了一个通用的函数，不用在aspx页面中进行任何特殊的设置，直接在事件Page_Load中调用该函数即可：
函数描述：防止页面postback时滚动到页顶
1
/// <summary>
2
/// prevent page to scroll while postback (2006-04-06)
3 /// </summary>
4 /// <remarks>
5 /// e.g.
6 /// private void Page_Load(object sender, System.EventArgs e)
7 /// {
8 /// CodeHelper.RetainScrollPosition(this);
9 /// }
10 /// </remarks>
11
/// <param name="page">the instance of current Page</param>
12
public static void RetainScrollPosition(Page page)
13 {
14 StringBuilder saveScrollPosition = new StringBuilder ();
15 StringBuilder setScrollPosition = new StringBuilder ();
16
17 page.RegisterHiddenField("__SCROLLPOS", "0");
18
19 saveScrollPosition.Append("<script language='javascript'>");
20 saveScrollPosition.Append("function saveScrollPosition() {");
21 saveScrollPosition.Append(" document.forms[0].__SCROLLPOS.value = document.body.scrollTop;");
22 saveScrollPosition.Append("}");
23 saveScrollPosition.Append("document.body.onscroll=saveScrollPosition;");
24 saveScrollPosition.Append("</script>");
25
26 page.RegisterStartupScript("saveScroll", saveScrollPosition.ToString());
27
28 if (page.IsPostBack)
29
{
30 setScrollPosition.Append("<script language='javascript'>");
31 setScrollPosition.Append("function setScrollPosition() {");
32 setScrollPosition.Append(" document.body.scrollTop = " + page.Request["__SCROLLPOS"] + ";");
33 setScrollPosition.Append("}");
34 setScrollPosition.Append("document.body.onload=setScrollPosition;");
35 setScrollPosition.Append("</script>");
36
37 page.RegisterStartupScript("setScroll", setScrollPosition.ToString());
38
}
39 }
/// <summary>
2
/// prevent page to scroll while postback (2006-04-06)3
/// </summary>4
/// <remarks>5
/// e.g.6
/// private void Page_Load(object sender, System.EventArgs e)7
/// {8
/// CodeHelper.RetainScrollPosition(this);9
/// }10
/// </remarks>11
/// <param name="page">the instance of current Page</param>12
public static void RetainScrollPosition(Page page) 13
{ 
14
StringBuilder saveScrollPosition = new StringBuilder (); 15
StringBuilder setScrollPosition = new StringBuilder (); 16
17
page.RegisterHiddenField("__SCROLLPOS", "0"); 18
19
saveScrollPosition.Append("<script language='javascript'>"); 20
saveScrollPosition.Append("function saveScrollPosition() {"); 21
saveScrollPosition.Append(" document.forms[0].__SCROLLPOS.value = document.body.scrollTop;"); 22
saveScrollPosition.Append("}"); 23
saveScrollPosition.Append("document.body.onscroll=saveScrollPosition;"); 24
saveScrollPosition.Append("</script>"); 25
26
page.RegisterStartupScript("saveScroll", saveScrollPosition.ToString()); 27
28
if (page.IsPostBack) 29
{ 
30
setScrollPosition.Append("<script language='javascript'>"); 31
setScrollPosition.Append("function setScrollPosition() {"); 32
setScrollPosition.Append(" document.body.scrollTop = " + page.Request["__SCROLLPOS"] + ";"); 33
setScrollPosition.Append("}"); 34
setScrollPosition.Append("document.body.onload=setScrollPosition;"); 35
setScrollPosition.Append("</script>"); 36
37
page.RegisterStartupScript("setScroll", setScrollPosition.ToString()); 38
} 39
}
以下为引用别人的东西：
1、在aspx页面给body添加id属性：<body id="thebody" MS_POSITIONING="GridLayout">
2、后台代码（.cs文件）中引用：using System.Text;
3、添加方法：
private void RetainScrollPosition() 
{ 
StringBuilder saveScrollPosition = new StringBuilder (); StringBuilder setScrollPosition = new StringBuilder (); RegisterHiddenField("__SCROLLPOS", "0"); saveScrollPosition.Append("<script language='javascript'>"); saveScrollPosition.Append("function saveScrollPosition() {"); saveScrollPosition.Append(" document.forms[0].__SCROLLPOS.value = thebody.scrollTop;"); saveScrollPosition.Append("}"); saveScrollPosition.Append("thebody.onscroll=saveScrollPosition;"); saveScrollPosition.Append("</script>"); RegisterStartupScript("saveScroll", saveScrollPosition.ToString()); if (Page.IsPostBack) 
{ 
setScrollPosition.Append("<script language='javascript'>"); setScrollPosition.Append("function setScrollPosition() {"); setScrollPosition.Append(" thebody.scrollTop = " + Request["__SCROLLPOS"] + ";"); setScrollPosition.Append("}"); setScrollPosition.Append("thebody.onload=setScrollPosition;"); setScrollPosition.Append("</script>"); RegisterStartupScript("setScroll", setScrollPosition.ToString()); 
} 
}
4、在page_load中调用此方法：
this.RetainScrollPosition();
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