RE: Built-In JavaScript-Rendering Functions

Thanks so much!

"Steven Cheng[MSFT]" wrote:

Hi Alex,

Thank you for posting.

As for the script rendering and manipulating functions in ASP.NET 2.0 you
asked, here are some of my understanding and suggestoin:

1.* When I'm finished doing stuff in Page_Load(), I'd like the cause the
page
to scroll to a specific anchor or to the top or bottom of the page.
==========================================
So far for scrolling, ASP.NET 2.0's page class hasn't provided built-in
methods to do this work. We may still have to use some custom client-side
script to scroll page to a certain position. For example, the following
script just help to scroll to a client-side html element:

================
function ScrollToElement(theElement)
{


var selectedPosX = 0;
var selectedPosY = 0;

while(theElement != null){
selectedPosX += theElement.offsetLeft;
selectedPosY += theElement.offsetTop;
theElement = theElement.offsetParent;
}


window.scrollTo(selectedPosX,selectedPosY);

}
================


2. * When the page is finished loading, I want to be able to
programmatically
designate a text-box to have the focus for user entry.
==========================================
For set a focus a a certain input field(textbox), ASP.NET 2.0 page class
rpovide the "SetFocus" method, which take a control instance as input
parameter, this can help set the focus on the certain control after the
page get loaded on client.

#Page.SetFocus Method (Control)
http://msdn2.microsoft.com/en-us/library/e04ah0f4(VS.80).aspx

e.g:

protected void Button1_Click(object sender, EventArgs e)
{
Page.SetFocus(this.Label7);
}



3. Is there any built-in server-side code I can call that will cause the
appropriate client-side JavaScript to be rendered to the client to do these
things?
==========================================
for registering script code that will be executed after the page get loaded
at client browser, we're recommended to use the
Page.ClientScript.RegisterStartupScript function.


#ClientScriptManager.RegisterStartupScript Method (Type, String, String)
http://msdn2.microsoft.com/en-us/library/asz8zsxy.aspx


And for the case that we want to dynamically register the script code that
scroll the page to a certain control/element, we can use the below code in
codebehind together with the scrpit function mentioned in #1:

===============
string script = "ScrollToElement(document.getElementById('{0}'));";

Page.ClientScript.RegisterStartupScript(this.GetType(), "scroll",
string.Format(script, this.a1.ClientID),
true);
================

Hope this helps.

Regards,

Steven Cheng
Microsoft Online Community Support


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