floatadv.js

来自「基于Windows平台的ASP.net框架」· JavaScript 代码 · 共 72 行

/******************************************************************************
  Crossday Discuz! Board - Floating Advertisements for Discuz!
  Copyright 2001-2006 Comsenz Inc. (http://www.comsenz.com)
*******************************************************************************/

var delta=0.15;
var collection;
var closeB=false;
var documentBody = document.documentElement.clientHeight>0 ? document.documentElement : document.body;



function floaters() {
  this.items = [];
  this.addItem = function(id,x,y,content)
      {
     document.write('<DIV id='+id+' style="Z-INDEX: 10; POSITION: absolute;width:80px; height:60px;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!=(documentBody.scrollLeft+followObj_x)) {
     var dx=(documentBody.scrollLeft+followObj_x-followObj.offsetLeft)*delta;
     dx=(dx>0?1:-1)*Math.ceil(Math.abs(dx));
     followObj.style.left=(followObj.offsetLeft+dx) + "px";
     }

    if(followObj.offsetTop!=(documentBody.scrollTop+followObj_y)) {
     var dy=(documentBody.scrollTop+followObj_y-followObj.offsetTop)*delta;
     dy=(dy>0?1:-1)*Math.ceil(Math.abs(dy));
     followObj.style.top=(followObj.offsetTop+dy) + "px";
     }
    followObj.style.display = 'block';
   }
  }
  function closeBanner()
  {
   closeB=true;
   return;
  }

var theFloaters  = new floaters();