Michael Freidgeim's Blog

function SetVerticalMiddle(element)

{

    //Derived from http://www.asp.net/AJAX/AjaxControlToolkit/Samples/AlwaysVisibleControl/AlwaysVisibleControl.aspx AjaxControlToolkit.VerticalSide.Middle

    var y = 0;

    // Compute the width and height of the client

    // var CommonToolkitScripts = new AjaxControlToolkit._CommonToolkitScripts();

    // var clientBounds = CommonToolkitScripts.getClientBounds();

    // debugger;

    // var width = clientBounds.width;

    var height = getClientHeight();//clientBounds.height;

    if (document.documentElement && document.documentElement.scrollTop) {

        // x = document.documentElement.scrollLeft;

        y = document.documentElement.scrollTop;

    }

    else {

        // x = document.body.scrollLeft;

        y = document.body.scrollTop;

    }

    // Compute the coordinates

    // x = Math.max(0, Math.floor(x + width / 2.0 - element.offsetWidth / 2.0 ));

    y = Math.max(0, Math.floor(y + height / 2.0 - element.offsetHeight / 2.0 ));

    // element.style.left = x + 'px';

    element.style.top = y + 'px';

}

//copied from AjaxControlToolkit\Common\Common.js, fix from http://forums.asp.net/p/1002123/1323677.aspx#1323677

function getClientHeight() {

    /// <summary>

    /// Gets the height of the browser client window (excluding scrollbars)

    /// </summary>

    /// Browser's client height

    /// </returns>

    // var clientWidth;

    var clientHeight;

    switch(Sys.Browser.agent) {

    case Sys.Browser.InternetExplorer:

    // if (document.documentElement && document.documentElement.clientWidth)

    // clientWidth = document.documentElement.clientWidth;

    // else if (document.body)

    // clientWidth = document.body.clientWidth;

        if (document.documentElement && document.documentElement.clientHeight)

            clientHeight = document.documentElement.clientHeight;

        else if (document.body)

            clientHeight = document.body.clientHeight;

    break;

        // clientWidth = document.documentElement.clientWidth;

        clientHeight = document.documentElement.clientHeight;

    break;

    case Sys.Browser.Safari:

        // clientWidth = window.innerWidth;

        clientHeight = window.innerHeight;

    break;

    case Sys.Browser.Opera:

        // clientWidth = Math.min(window.innerWidth, document.body.clientWidth);

        clientHeight = Math.min(window.innerHeight, document.body.clientHeight);

    break;

    default: // Sys.Browser.Firefox, etc.

        // clientWidth = Math.min(window.innerWidth, document.documentElement.clientWidth);

        clientHeight = Math.min(window.innerHeight, document.documentElement.clientHeight);

    break;

    }

    return clientHeight;//new Sys.UI.Bounds(0, 0, clientWidth, clientHeight);

}