Scroll Page 表单提交后页面重新滚回原来滚动条所在位置
作者scottwater
原文地址：http://scottwater.com/articles/ScrollPage
感谢scottwater先生！
原文地址：http://scottwater.com/articles/ScrollPage
感谢scottwater先生！
1
#region Disclaimer
2
/**//**********************************************************************
3
Based on presentation by Brad McCabe of Infragistics
4
5Updated by Scott Watermasysk (http://scottwater.com)
6
7Provided as is, with no warrenty, etc.
8Please use however you see fit. Just don't ask for a VB version :)
9
***********************************************************************/
10
#endregion
11
12using System;
13using System.IO;
14using System.Text;
15using System.Text.RegularExpressions;
16using System.Web.UI;
17
18namespace ShangGu.XaTaxi.Components
19{
20 /**//// <summary>
21 /// Summary description for ScrollPage.
22 /// </summary>
23 public class ScrollPage : System.Web.UI.Page
24 {
25 public ScrollPage()
26 {
27
28 }
29
30 private bool _useScrollPersistence = true;
31 /**//// <summary>
32 /// There could be PostBack senarios where we do not want to remember the scroll position. Set this property to false
33 /// if you would like the page to forget the current scroll position
34 /// </summary>
35 public bool UseScrollPersistence
36 {
37 get {return this._useScrollPersistence;}
38 set {this._useScrollPersistence = value;}
39 }
40
41 private string _bodyID;
42 /**//// <summary>
43 /// Some pages might already have the ID attribute set for the body tag. Setting this property will not render the ID or change
44 /// the existing value. It will simply update the javascript written out to the browser.
45 /// </summary>
46 public string BodyID
47 {
48 get {return this._bodyID;}
49 set {this._bodyID = value;}
50 }
51
52
53 //Last chance. Do we want to maintain the current scroll position
54 protected override void OnPreRender(EventArgs e)
55 {
56 if(UseScrollPersistence)
57 {
58 RetainScrollPosition();
59 }
60 base.OnPreRender (e);
61 }
62
63 protected override void Render(HtmlTextWriter writer)
64 {
65 //No need processing the HTML if the user does not want to maintain scroll position or already has
66 //set the body ID value
67 if(UseScrollPersistence)
68 {
69 TextWriter tempWriter = new StringWriter();
70 base.Render(new HtmlTextWriter(tempWriter));
71 if(BodyID == null)
72 {
73 writer.Write(Regex.Replace(tempWriter.ToString(),"<body","<body id="thebody" ",RegexOptions.IgnoreCase));
74 }
75 //=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
76 //
77 //2004－9－16 武眉博 修正了因BodyID不空时造成javascript错误的bug
78 //
79 //=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
80 else
81 {
82 writer.Write(Regex.Replace(tempWriter.ToString(),"<body","<body id=""+BodyID+"" ",RegexOptions.IgnoreCase));
83
84 }
85 }
86 else
87 {
88 base.Render(writer);
89 }
90 }
91
92 //=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
93 //
94 //2004－9－20 武眉博 增加了隐藏文本域"__SCROLLPOS_LEFT"，以增加对横向滚动条位置的记忆功能
95 //
96 //=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
97 private static string saveScrollPosition = "<script language='javascript'>function saveScrollPosition() {{document.forms[0].__SCROLLPOS_TOP.value = {0}.scrollTop;document.forms[0].__SCROLLPOS_LEFT.value = {0}.scrollLeft ;}}{0}.onscroll=saveScrollPosition;</script>";
98 private static string setScrollPosition = "<script language='javascript'>function setScrollPosition() {{{0}.scrollTop ="{1}"; {0}.scrollLeft ="{2}"}}{0}.onload=setScrollPosition;</script>";
99
100 //Write out javascript and hidden field
101 private void RetainScrollPosition()
102 {
103 RegisterHiddenField("__SCROLLPOS_TOP", "0");
104 RegisterHiddenField("__SCROLLPOS_LEFT", "0");
105 string __bodyID = BodyID == null ? "thebody" : BodyID;
106 RegisterStartupScript("saveScroll", string.Format(saveScrollPosition,__bodyID));
107
108 if(Page.IsPostBack)
109 {
110 RegisterStartupScript("setScroll", string.Format(setScrollPosition,__bodyID, Request.Form["__SCROLLPOS_TOP"],Request.Form["__SCROLLPOS_LEFT"]));
111 }
112 }
113 }
114
115}
116
#region Disclaimer 
2
/**//********************************************************************** 
3
Based on presentation by Brad McCabe of Infragistics 4
5
Updated by Scott Watermasysk (http://scottwater.com) 6
7
Provided as is, with no warrenty, etc. 8
Please use however you see fit. Just don't ask for a VB version :) 9
***********************************************************************/ 10
#endregion 11
12
using System; 13
using System.IO; 14
using System.Text; 15
using System.Text.RegularExpressions; 16
using System.Web.UI; 17
18
namespace ShangGu.XaTaxi.Components 19
{ 
20
/**//// <summary> 21
/// Summary description for ScrollPage. 22
/// </summary> 23
public class ScrollPage : System.Web.UI.Page 24
{ 25
public ScrollPage() 26
{ 27
28
} 29
30
private bool _useScrollPersistence = true; 31
/**//// <summary> 32
/// There could be PostBack senarios where we do not want to remember the scroll position. Set this property to false 33
/// if you would like the page to forget the current scroll position 34
/// </summary> 35
public bool UseScrollPersistence 36
{ 37
get {return this._useScrollPersistence;} 38
set {this._useScrollPersistence = value;} 39
} 40
41
private string _bodyID; 42
/**//// <summary> 43
/// Some pages might already have the ID attribute set for the body tag. Setting this property will not render the ID or change 44
/// the existing value. It will simply update the javascript written out to the browser. 45
/// </summary> 46
public string BodyID 47
{ 48
get {return this._bodyID;} 49
set {this._bodyID = value;} 50
} 51
52
53
//Last chance. Do we want to maintain the current scroll position 54
protected override void OnPreRender(EventArgs e) 55
{ 56
if(UseScrollPersistence) 57
{ 58
RetainScrollPosition(); 59
} 60
base.OnPreRender (e); 61
} 62
63
protected override void Render(HtmlTextWriter writer) 64
{ 65
//No need processing the HTML if the user does not want to maintain scroll position or already has 66
//set the body ID value 67
if(UseScrollPersistence) 68
{ 69
TextWriter tempWriter = new StringWriter(); 70
base.Render(new HtmlTextWriter(tempWriter)); 71
if(BodyID == null) 72
{ 73
writer.Write(Regex.Replace(tempWriter.ToString(),"<body","<body id="thebody" ",RegexOptions.IgnoreCase)); 74
} 75
//=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 76
// 77
//2004－9－16 武眉博 修正了因BodyID不空时造成javascript错误的bug 78
// 79
//=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 80
else 81
{ 82
writer.Write(Regex.Replace(tempWriter.ToString(),"<body","<body id=""+BodyID+"" ",RegexOptions.IgnoreCase)); 83
84
} 85
} 86
else 87
{ 88
base.Render(writer); 89
} 90
} 91
92
//=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 93
// 94
//2004－9－20 武眉博 增加了隐藏文本域"__SCROLLPOS_LEFT"，以增加对横向滚动条位置的记忆功能 95
// 96
//=++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 97
private static string saveScrollPosition = "<script language='javascript'>function saveScrollPosition() {{document.forms[0].__SCROLLPOS_TOP.value = {0}.scrollTop;document.forms[0].__SCROLLPOS_LEFT.value = {0}.scrollLeft ;}}{0}.onscroll=saveScrollPosition;</script>"; 98
private static string setScrollPosition = "<script language='javascript'>function setScrollPosition() {{{0}.scrollTop ="{1}"; {0}.scrollLeft ="{2}"}}{0}.onload=setScrollPosition;</script>"; 99
100
//Write out javascript and hidden field 101
private void RetainScrollPosition() 102
{ 103
RegisterHiddenField("__SCROLLPOS_TOP", "0"); 104
RegisterHiddenField("__SCROLLPOS_LEFT", "0"); 105
string __bodyID = BodyID == null ? "thebody" : BodyID; 106
RegisterStartupScript("saveScroll", string.Format(saveScrollPosition,__bodyID)); 107
108
if(Page.IsPostBack) 109
{ 110
RegisterStartupScript("setScroll", string.Format(setScrollPosition,__bodyID, Request.Form["__SCROLLPOS_TOP"],Request.Form["__SCROLLPOS_LEFT"])); 111
} 112
} 113
} 114
115
} 116
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