jquery插件jtip的实用修改

jtip插件可以方便作出超酷的提示效果，但功能过于简单，我对其进行了扩展改进：

1.将ajax文件加载方式由href改为rel

2.增加了 鼠标可以移动到弹出层，当鼠标离开时弹出层消失

3.增加了 可以将本页面内某ID的层内容 显示为提示层。比如：<a rel="$testdiv">显示testdiv</a>

<div id="testdiv">这里是testdiv的内容</div> 当鼠标移动到上边链接时，将显示testdiv层内的内容

以下为jtip代码

//on page load (as soon as its ready) call JT_init
$(document).ready(JT_init);
var JT_delay = 0;
function JT_init(){
        $("a.jTip")
     .hover(function(){JT_show(this.rel,this.id,this.name)},function(){JT_close()})
           .click(function(){return false});   
}

function JT_show(url,linkId,title){
clearTimeout(JT_delay);
$('#JT').remove();
if(title == false)title="&nbsp;";
var de = document.documentElement;
var w = self.innerWidth || (de&&de.clientWidth) || document.body.clientWidth;
var hasArea = w - getAbsoluteLeft(linkId);
var clickElementy = getAbsoluteTop(linkId) - 3; //set y position

var queryString = url.replace(/^[^\?]+\??/,'');
var params = parseQuery( queryString );
if(params['width'] === undefined){params['width'] = 250};
if(params['link'] !== undefined){
$('#' + linkId).bind('click',function(){window.location = params['link']});
$('#' + linkId).css('cursor','pointer');
}

if(hasArea>((params['width']*1)+75)){
   $("body").append("<div id='JT' style='width:"+params['width']*1+"px'><div id='JT_arrow_left'></div><div id='JT_close_left'>"+title+"</div><div id='JT_copy'><div class='JT_loader'><div></div></div>");//right side
   var arrowOffset = getElementWidth(linkId) + 11;
   var clickElementx = getAbsoluteLeft(linkId) + arrowOffset; //set x position
}else{
   $("body").append("<div id='JT' style='width:"+params['width']*1+"px'><div id='JT_arrow_right' style='left:"+((params['width']*1)+1)+"px'></div><div id='JT_close_right'>"+title+"</div><div id='JT_copy'><div class='JT_loader'><div></div></div>");//left side
   var clickElementx = getAbsoluteLeft(linkId) - ((params['width']*1) + 15); //set x position
}

$('#JT').css({left: clickElementx+"px", top: clickElementy+"px"});
$('#JT').mouseover(function(){clearTimeout(JT_delay);})
$('#JT').mouseout(function() {JT_close();});

var urlParts = url.split("\?", 2);
urlParts[0] = urlParts[0].substr(urlParts[0].lastIndexOf('/')+1);

if(urlParts[0].charAt(0) == '$')
{
   $('#JT').html($("#"+urlParts[0].substr(1)).html());
   $('#JT').show();
}
else{
   $('#JT').show();
   $('#JT_copy').load(url);
}

}
function JT_close(){
JT_delay = setTimeout(function(){$('#JT').remove();},200);
}
function getElementWidth(objectId) {
x = document.getElementById(objectId);
return x.offsetWidth;
}

function getAbsoluteLeft(objectId) {
// Get an object left position from the upper left viewport corner
o = document.getElementById(objectId)
oLeft = o.offsetLeft            // Get left position from the parent object
while(o.offsetParent!=null) {   // Parse the parent hierarchy up to the document element
   oParent = o.offsetParent    // Get parent object reference
   oLeft += oParent.offsetLeft // Add parent left position
   o = oParent
}
return oLeft
}

function getAbsoluteTop(objectId) {
// Get an object top position from the upper left viewport corner
o = document.getElementById(objectId)
oTop = o.offsetTop            // Get top position from the parent object
while(o.offsetParent!=null) { // Parse the parent hierarchy up to the document element
   oParent = o.offsetParent // Get parent object reference
   oTop += oParent.offsetTop // Add parent top position
   o = oParent
}
return oTop
}

function parseQuery ( query ) {
   var Params = new Object ();
   if ( ! query ) return Params; // return empty object
   var Pairs = query.split(/[;&]/);
   for ( var i = 0; i < Pairs.length; i++ ) {
      var KeyVal = Pairs[i].split('=');
      if ( ! KeyVal || KeyVal.length != 2 ) continue;
      var key = unescape( KeyVal[0] );
      var val = unescape( KeyVal[1] );
      val = val.replace(/\+/g, ' ');
      Params[key] = val;
   }
   return Params;
}

function blockEvents(evt) {
              if(evt.target){
              evt.preventDefault();
              }else{
              evt.returnValue = false;
              }
}