floatadv.js

Discuz! 论坛软件系统

/******************************************************************************
  Crossday Discuz! Board - Floating Advertisements for Discuz!
  Copyright 2001-2005 Comsenz Technology Ltd (http://www.comsenz.com)
*******************************************************************************/

var delta=0.15;
var collection;
var closeB=false;
function floaters() {
	this.items = [];
	this.addItem = function(id,x,y,content)	{
		document.write('<div id='+id+' style="z-index: 10; position: absolute; width:'+(document.body.clientWidth-(typeof(x)=='string' ? eval(x) : x)*2)+'px; left:'+(typeof(x)=='string' ? eval(x) : x)+';top:'+(typeof(y)=='string'? eval(y) : y)+'">'+content+'</div>');
		var newItem={};
		newItem.object=document.getElementById(id);
		newItem.x=x;
		newItem.y=y;
		this.items[this.items.length]=newItem;
	}
	this.play = function() {
		collection=this.items;
		setInterval('play()',30);
	}
}
function play() {
	if(screen.width<=800 || closeB) {
		for(var i=0;i<collection.length;i++) {
			collection[i].object.style.display='none';
		}
		return;
	}
	for(var i=0;i<collection.length;i++) {
		var followObj=collection[i].object;
		var followObj_x=(typeof(collection[i].x)=='string'?eval(collection[i].x):collection[i].x);
		var followObj_y=(typeof(collection[i].y)=='string'?eval(collection[i].y):collection[i].y);
		if(followObj.offsetLeft!=(document.body.scrollLeft+followObj_x)) {
			var dx=(document.body.scrollLeft+followObj_x-followObj.offsetLeft)*delta;
			dx=(dx>0?1:-1)*Math.ceil(Math.abs(dx));
			followObj.style.left=followObj.offsetLeft+dx;
		}
		if(followObj.offsetTop!=(document.body.scrollTop+followObj_y)) {
			var dy=(document.body.scrollTop+followObj_y-followObj.offsetTop)*delta;
			dy=(dy>0?1:-1)*Math.ceil(Math.abs(dy));
			followObj.style.top=followObj.offsetTop+dy;
		}
		followObj.style.display = '';
	}
}
function closeBanner() {
	closeB=true;
	return;
}

var theFloaters= new floaters();