Floating Menu Script

Standard

<div id=”floatdiv” style=”
position:absolute;
width:200px;height:50px;left:0px;top:0px;
padding:16px;background:#FFFFFF;
border:2px solid #2266AA”>
This is a floating javascript menu.
<script type=”text/javascript”><!–
/* Script by: http://www.jtricks.com
* Version: 20071017
* Latest version:
* http://www.jtricks.com/javascript/navigation/floating.html
*/
var floatingMenuId = ‘floatdiv’;
var floatingMenu =
{
targetX: -250,
targetY: 10,

hasInner: typeof(window.innerWidth) == ‘number’,
hasElement: typeof(document.documentElement) == ‘object’
&& typeof(document.documentElement.clientWidth) == ‘number’,

menu:
document.getElementById
? document.getElementById(floatingMenuId)
: document.all
? document.all[floatingMenuId]
: document.layers[floatingMenuId]
};

floatingMenu.move = function ()
{
floatingMenu.menu.style.left = floatingMenu.nextX + ‘px’;
floatingMenu.menu.style.top = floatingMenu.nextY + ‘px’;
}

floatingMenu.computeShifts = function ()
{
var de = document.documentElement;

floatingMenu.shiftX =
floatingMenu.hasInner
? pageXOffset
: floatingMenu.hasElement
? de.scrollLeft
: document.body.scrollLeft;
if (floatingMenu.targetX < 0)
{
floatingMenu.shiftX +=
floatingMenu.hasElement
? de.clientWidth
: document.body.clientWidth;
}

floatingMenu.shiftY =
floatingMenu.hasInner
? pageYOffset
: floatingMenu.hasElement
? de.scrollTop
: document.body.scrollTop;
if (floatingMenu.targetY < 0)
{
if (floatingMenu.hasElement && floatingMenu.hasInner)
{
// Handle Opera 8 problems
floatingMenu.shiftY +=
de.clientHeight > window.innerHeight
? window.innerHeight
: de.clientHeight
}
else
{
floatingMenu.shiftY +=
floatingMenu.hasElement
? de.clientHeight
: document.body.clientHeight;
}
}
}

floatingMenu.calculateCornerX = function()
{
if (floatingMenu.targetX != ‘center’)
return floatingMenu.shiftX + floatingMenu.targetX;

var width = parseInt(floatingMenu.menu.offsetWidth);

var cornerX =
floatingMenu.hasElement
? (floatingMenu.hasInner
? pageXOffset
: document.documentElement.scrollLeft) +
(document.documentElement.clientWidth – width)/2
: document.body.scrollLeft +
(document.body.clientWidth – width)/2;
return cornerX;
};

floatingMenu.calculateCornerY = function()
{
if (floatingMenu.targetY != ‘center’)
return floatingMenu.shiftY + floatingMenu.targetY;

var height = parseInt(floatingMenu.menu.offsetHeight);

// Handle Opera 8 problems
var clientHeight =
floatingMenu.hasElement && floatingMenu.hasInner
&& document.documentElement.clientHeight
> window.innerHeight
? window.innerHeight
: document.documentElement.clientHeight

var cornerY =
floatingMenu.hasElement
? (floatingMenu.hasInner
? pageYOffset
: document.documentElement.scrollTop) +
(clientHeight – height)/2
: document.body.scrollTop +
(document.body.clientHeight – height)/2;
return cornerY;
};

floatingMenu.doFloat = function()
{
var stepX, stepY;

floatingMenu.computeShifts();

var cornerX = floatingMenu.calculateCornerX();

var stepX = (cornerX – floatingMenu.nextX) * .07;
if (Math.abs(stepX) < .5)
{
stepX = cornerX – floatingMenu.nextX;
}

var cornerY = floatingMenu.calculateCornerY();

var stepY = (cornerY – floatingMenu.nextY) * .07;
if (Math.abs(stepY) < .5)
{
stepY = cornerY – floatingMenu.nextY;
}

if (Math.abs(stepX) > 0 ||
Math.abs(stepY) > 0)
{
floatingMenu.nextX += stepX;
floatingMenu.nextY += stepY;
floatingMenu.move();
}

setTimeout(‘floatingMenu.doFloat()’, 20);
};

// addEvent designed by Aaron Moore
floatingMenu.addEvent = function(element, listener, handler)
{
if(typeof element[listener] != ‘function’ ||
typeof element[listener + ‘_num’] == ‘undefined’)
{
element[listener + ‘_num’] = 0;
if (typeof element[listener] == ‘function’)
{
element[listener + 0] = element[listener];
element[listener + ‘_num’]++;
}
element[listener] = function(e)
{
var r = true;
e = (e) ? e : window.event;
for(var i = element[listener + ‘_num’] -1; i >= 0; i–)
{
if(element[listener + i](e) == false)
r = false;
}
return r;
}
}

//if handler is not already stored, assign it
for(var i = 0; i < element[listener + ‘_num’]; i++)
if(element[listener + i] == handler)
return;
element[listener + element[listener + ‘_num’]] = handler;
element[listener + ‘_num’]++;
};

floatingMenu.init = function()
{
floatingMenu.initSecondary();
floatingMenu.doFloat();
};

// Some browsers init scrollbars only after
// full document load.
floatingMenu.initSecondary = function()
{
floatingMenu.computeShifts();
floatingMenu.nextX = floatingMenu.calculateCornerX();
floatingMenu.nextY = floatingMenu.calculateCornerY();
floatingMenu.move();
}

if (document.layers)
floatingMenu.addEvent(window, ‘onload’, floatingMenu.init);
else
{
floatingMenu.init();
floatingMenu.addEvent(window, ‘onload’,
floatingMenu.initSecondary);
}

//–></script>

</div>

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