While not elegant for your situation, it is also possible to use dummy Custom Validators, set the one you want to scroll to as invalid then do
DummyCustomValidator.SetFocusOnError = true;
In my case, I am actually using page Validators with async postbacks and multiple programmatically shown/hidden panels on a long vertical form. Since some fields are only required if MyLogicalParent.Visible = true and if specific answers are given in other controls, such as a RequiredFieldValidator on a TextBox when "Other" is selected in a CheckBoxList, I have a LOT of logic to process page validation. Setting scroll positions was painful in all of the normal methods.
I also use RegisterStartupScript to handle maintaining the current scroll position when async postbacks alter the page's vertical dimension.
<script type="text/javascript">
$(document).ready(function () {
var windowHeight = $(document)[0].documentElement.clientHeight; /*This is the height of the viewable browser area.*/
var scrolledPosition = $(window)[0].scrollY; /*This is the number of Pixels the Window is currently scrolled to.*/
var scroll = windowHeight + scrolledPosition; /*This should be the same as $(window).scrollTop() */
/*If the amount scrolled + the height of the window is Less than or equal to the total height of the page (past the viewable client window)*/
if ($(window).scrollTop() + getWindowSize()[1] <= getDocHeight()) {
/*Move the morescroll div to the bottom of the page... -34 is the height of the div plus a small bottom margin.*/
$("#morescroll").offset({ top: windowHeight - 34 });
}
})
/*This is the total height of the document including the area past the viewable client window.*/
function getDocHeight() {
var D = document;
/*The Largest of these six numbers is the total doc height. */
return Math.max(
D.body.scrollHeight, D.documentElement.scrollHeight,
D.body.offsetHeight, D.documentElement.offsetHeight,
D.body.clientHeight, D.documentElement.clientHeight
);
}
/*This is the width and height of the Viewable Browser area.*/
function getWindowSize() {
var myWidth = 0, myHeight = 0;
if (typeof (window.innerWidth) == 'number') {
//Non-IE
myWidth = window.innerWidth;
myHeight = window.innerHeight;
} else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
//IE 6+ in 'standards compliant mode'
myWidth = document.documentElement.clientWidth;
myHeight = document.documentElement.clientHeight;
} else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
//IE 4 compatible
myWidth = document.body.clientWidth;
myHeight = document.body.clientHeight;
}
return [myWidth, myHeight];
}
//This sets a transparent div <div id="morescroll" class="scrollMinder"> with the text "Scroll down for more." to the bottom of the viewable page.
$(window).scroll(
function () {
var windowHeight = $(document)[0].documentElement.clientHeight;
var scrolledPosition = $(window)[0].scrollY;
var scrll = windowHeight + scrolledPosition;
document.getElementById('<%= HF_LastScrolled.ClientID %>').value = scrolledPosition;
var docHeight = $(document)[0].documentElement.scrollHeight;
/*if we are scrolled to within 60 pixels from the bottom of the document, hide the indicator so it doesn't cover the footer.*/
if ($(window).scrollTop() + $(window).height() >= $(document).height() - 60) {
$("#morescroll").hide();
}
/*if we scroll back above 60 pixels from the bottom of the document, show the indicator and set the top of the div to -34 pixels.*/
else if ($(window).scrollTop() + getWindowSize()[1] <= getDocHeight()) {
$("#morescroll").show();
$("#morescroll").offset({ top: scrll - 34 });
}
});
</script>
<%-- This stores the Y scroll location.--%>
<asp:HiddenField ID="HF_LastScrolled" runat="server" />
<div id="morescroll" class="scrollMinder">
<span class="spanMinder">Scroll down for more.</span>
</div>
private string LastScrolled = "";
protected void Page_PreRender (object sender, EventArgs e)
{
if (string.IsNullOrEmpty(LastScrolled))
{
LastScrolled = "0";
}
if (string.IsNullOrEmpty(scrollPosition))
{
sb.Clear();
sb.AppendLine("Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);");
sb.AppendLine("function EndRequestHandler(sender, args) {");
sb.Append("scrollTo(0, ").Append(LastScrolled).Append(");");
sb.AppendLine("}");
sb.AppendLine("function load() {");
sb.AppendLine("Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);");
sb.AppendLine("}");
cs.RegisterStartupScript(GetType(), "ScrollToLastPosition", sb.ToString(), true);
scrollPosition = "ScrollToLastPosition";
}
if (!string.IsNullOrEmpty(scrollPosition))
{
ScriptManager.RegisterStartupScript(this, GetType(), scrollPosition, sb.ToString(), true);
}
}
protected void Page_Load (object sender, EventArgs e)
{
LastScrolled = HF_LastScrolled.Value;
Page.MaintainScrollPositionOnPostBack = false;
}
protected void SetScrollToLastPosition ()
{
sb.Clear();
sb.AppendLine("Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);");
sb.AppendLine("function EndRequestHandler(sender, args) {");
sb.Append("scrollTo(0, ").Append(LastScrolled).AppendLine(");");
sb.AppendLine("}");
sb.AppendLine("function load() {");
sb.AppendLine("Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);");
sb.AppendLine("}");
cs.RegisterStartupScript(GetType(), "ScrollToLastPosition", sb.ToString(), true);
scrollPosition = "ScrollToLastPosition";
string tempstring = sb.ToString();
ScriptManager.RegisterStartupScript(this, GetType(), scrollPosition, sb.ToString(), true);
}
protected void SetScrolltoPositionY (int y)
{
sb.Clear();
sb.AppendLine("Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);");
sb.AppendLine("function EndRequestHandler(sender, args) {");
sb.Append("scrollTo(0, ").Append(y).AppendLine(");");
sb.AppendLine("}");
sb.AppendLine("function load() {");
sb.AppendLine("Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);");
sb.AppendLine("}");
cs.RegisterStartupScript(GetType(), "ScrollTo-0-" + y.ToString(), sb.ToString(), true);
scrollPosition = "ScrollTo - 0-" + y.ToString();
string tempstring = sb.ToString();
ScriptManager.RegisterStartupScript(this, GetType(), scrollPosition, sb.ToString(), true);
}
