asp.net c#在updatepanel中支持滚动条记忆功能

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)
        {
           DoMaintainScrollPosition

补充：Web开发 , ASP.Net ,