asp.net c#在updatepanel中支持滚动条记忆功能

2013 年 7 月 17 日4030

  在非ajax页面中,只要在page上设置 MaintainScrollPositionOnPostback="true" 即可进行记忆滚动条位置.

  但是在ajax中,这个功能却不能正确工作了,那么我们应当如何让div自动维护滚动条位置呢?

  首先在页面上增加 asp:panel控件 ,然后在aspx.cs后台 加入以下方法:

  [c#]

  protected void DoMaintainScrollPositionForAjax(UpdatePanel updatePanel,Panel panel)

  {

  StringBuilder sb = new StringBuilder();

  sb.AppendLine(@"function Panel_SaveScrollPosition(PanelID){

  if(document.getElementById(PanelID)!=null){

  document.getElementById(PanelID+'_ScrollPosX').value = document.getElementById(PanelID).scrollLeft;

  document.getElementById(PanelID+'_ScrollPosY').value = document.getElementById(PanelID).scrollTop;}}

  function Panel_RestoreScrollPosition(PanelID){

  if(document.getElementById(PanelID)!=null){

  document.getElementById(PanelID).scrollLeft = document.getElementById(PanelID+'_ScrollPosX').value;

  document.getElementById(PanelID).scrollTop = document.getElementById(PanelID+'_ScrollPosY').value;}}");

  ScriptManager.RegisterClientScriptBlock(updatePanel, panel.GetType(), "PanelScrollFunction", sb.ToString(), true);

  HiddenField x = new HiddenField();

  x.ID = panel.ClientID + "_ScrollPosX";

  x.ClientIDMode = panel.ClientIDMode;

  panel. Controls.Add(x);

  HiddenField y = new HiddenField();

  y.ID = panel.ClientID + "_ScrollPosY";

  y.ClientIDMode = panel.ClientIDMode;

  panel. Controls.Add(y);

  string sScript = "Panel_SaveScrollPosition('" + panel.ClientID + "');";

  ScriptManager.RegisterOnSubmitStatement(updatePanel, panel.GetType(), panel.ID + "_SavePanelScroll", sScript);

  if (Page.IsPostBack)

  {

  x.Value = Page.Request.Form[x.ClientID];

  y.Value = Page.Request.Form[y.ClientID];

  sScript = "Panel_RestoreScrollPosition('" + panel.ClientID + "');";

  ScriptManager.RegisterStartupScript(updatePanel, panel.GetType(), panel.ID + "_SetPanelScroll", sScript, true);

  }

  }

  protected void DoMaintainScrollPositionForAjax(UpdatePanel updatePanel,Panel panel)

  {

  StringBuilder sb = new StringBuilder();

  sb.AppendLine(@"function Panel_SaveScrollPosition(PanelID){

  if(document.getElementById(PanelID)!=null){

  document.getElementById(PanelID+'_ScrollPosX').value = document.getElementById(PanelID).scrollLeft;

  document.getElementById(PanelID+'_ScrollPosY').value = document.getElementById(PanelID).scrollTop;}}

  function Panel_RestoreScrollPosition(PanelID){

  if(document.getElementById(PanelID)!=null){

  document.getElementById(PanelID).scrollLeft = document.getElementById(PanelID+'_ScrollPosX').value;

  document.getElementById(PanelID).scrollTop = document.getElementById(PanelID+'_ScrollPosY').value;}}");

  ScriptManager.RegisterClientScriptBlock(updatePanel, panel.GetType(), "PanelScrollFunction", sb.ToString(), true);

  HiddenField x = new HiddenField();

  x.ID = panel.ClientID + "_ScrollPosX";

  x.ClientIDMode = panel.ClientIDMode;

  panel. Controls.Add(x);

  HiddenField y = new HiddenField();

  y.ID = panel.ClientID + "_ScrollPosY";

  y.ClientIDMode = panel.ClientIDMode;

  panel. Controls.Add(y);

  string sScript = "Panel_SaveScrollPosition('" + panel.ClientID + "');";

  ScriptManager.RegisterOnSubmitStatement(updatePanel, panel.GetType(), panel.ID + "_SavePanelScroll", sScript);

  if (Page.IsPostBack)

  {

  x.Value = Page.Request.Form[x.ClientID];

  y.Value = Page.Request.Form[y.ClientID];

  sScript = "Panel_RestoreScrollPosition('" + panel.ClientID + "');";

  ScriptManager.RegisterStartupScript(updatePanel, panel.GetType(), panel.ID + "_SetPanelScroll", sScript, true);

  }

  }

  通过以下方法在aspx.cs调用即可

  [c#]

  protected void Page_Load(object sender, EventArgs e)

  {

  DoMaintainScrollPositionForAjax(this.UpdatePanel1, Panel1);

  }

  protected void Page_Load(object sender, EventArgs e)

  {

  DoMaintainScrollPositionForAjax(this.UpdatePanel1, Panel1);

  }

【责编:cc】

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