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jQueryでメニューのマウスオーバーするJavaScript「jQuery Background Position」

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jQuery Background Positionからjquery.bgpos.js
jQueryからjquery.jsをダウロードする。

画像を用意する。

basic.css

#bgpos h2	{
  clear:both;
  padding-top:20px;
}
#bgpos ul {
  list-style:none;
  margin:0;
  padding:0;
}
#bgpos ul:after{
  content:"";
  display:block;
  clear:both;
}
#bgpos li {
  float:left;
  height:30px;
  line-height:30px;
  width:120px;
  margin:0;
  padding:0;
  text-align:center;
}
#bgpos li a {
  display:block;
  height:100%;
  color:#FFF;
  text-decoration:none;
  border-right:1px solid #FFF;
}
#bgpos li a {
  background:url(bg2.jpg) repeat 0 0;
}
#bgpos li a:hover, li a:focus, li a:active {
  background-position:-150px 0;
}
#bgpos #a a {
  background:url(bg.jpg) repeat -20px 35px;
}
#bgpos #b a {
  background:url(bg2.jpg) repeat 0 0;
}
#bgpos #c a {
  background:url(bg3.jpg) repeat 0 0;
}
#bgpos #d a {
  background:url(bg4.jpg) repeat 0 0;
}

index.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script type="text/javascript" src="./jQuery_1.7.1.js"></script>
<script type="text/javascript" src="./jquery.bgpos.js"></script>

<link rel="stylesheet" type="text/css" href="./basic.css" />

<script type="text/javascript">

$(function(){
	$('#a a')
		.css( {backgroundPosition: "-20px 35px"} )
		.mouseover(function(){
			$(this).stop().animate({backgroundPosition:"(-20px 94px)"}, {duration:500})
		})
		.mouseout(function(){
			$(this).stop().animate({backgroundPosition:"(40px 35px)"}, {duration:200, complete:function(){
				$(this).css({backgroundPosition: "-20px 35px"})
			}})
		})
	$('#b a')
		.css( {backgroundPosition: "0 0"} )
		.mouseover(function(){
			$(this).stop().animate({backgroundPosition:"(-150px 0)"}, {duration:500})
		})
		.mouseout(function(){
			$(this).stop().animate({backgroundPosition:"(-300px 0)"}, {duration:200, complete:function(){
				$(this).css({backgroundPosition: "0 0"})
			}})
		})
	$('#c a')
		.css( {backgroundPosition: "0 0"} )
		.mouseover(function(){
			$(this).stop().animate({backgroundPosition:"(0 -250px)"}, {duration:500})
		})
		.mouseout(function(){
			$(this).stop().animate({backgroundPosition:"(0 0)"}, {duration:500})
		})
	$('#d a')
		.css( {backgroundPosition: "0 0"} )
		.mouseover(function(){
			$(this).stop().animate({backgroundPosition:"(0 -250px)"}, {duration:500})
		})
		.mouseout(function(){
			$(this).stop().animate({backgroundPosition:"(0 0)"}, {duration:500})
		})
});
</script>
[/java]

1
</head>
<body>
<div id="bgpos"> 
  <h2 id="h2_8">Example A: Top down</h2>
	<ul id="a"> 
		<li><a style="background-position: -20px 35px;" href="#">Home</a></li> 
		<li><a style="background-position: -20px 35px;" href="#">About</a></li> 
		<li><a style="background-position: -20px 35px;" href="#">Contact</a></li> 
	</ul> 
  <h2 id="h2_9">Example B: Right left</h2>
	<ul id="b"> 
		<li><a style="background-position: 0pt 0pt;" href="#">Home</a></li> 
		<li><a style="background-position: 0pt 0pt;" href="#">About</a></li> 
		<li><a style="background-position: 0pt 0pt;" href="#">Contact</a></li> 
	</ul> 
  <h2 id="h2_10">Example C: Fade 1-colour</h2>
	<ul id="c"> 
		<li><a style="background-position: 0pt 0pt;" href="#">Home</a></li> 
		<li><a style="background-position: 0pt 0pt;" href="#">About</a></li> 
		<li><a style="background-position: 0pt 0pt;" href="#">Contact</a></li> 
	</ul> 
  <h2 id="h2_11">Example D: Fade 2-colour</h2>
	<ul id="d"> 
		<li><a style="background-position: 0pt 0pt;" href="#">Home</a></li> 
		<li><a style="background-position: 0pt 0pt;" href="#">About</a></li> 
		<li><a style="background-position: 0pt 0pt;" href="#">Contact</a></li> 
	</ul> 
</div> 
</body>
</html>

jquery.bgpos.js

/**
 * @author Alexander Farkas
 * v. 1.02
 */
(function($) {
	$.extend($.fx.step,{
	    backgroundPosition: function(fx) {
            if (fx.state === 0 && typeof fx.end == 'string') {
                var start = $.curCSS(fx.elem,'backgroundPosition');
                start = toArray(start);
                fx.start = [start[0],start[2]];
                var end = toArray(fx.end);
                fx.end = [end[0],end[2]];
                fx.unit = [end[1],end[3]];
			}
            var nowPosX = [];
            nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
            nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
            fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];

           function toArray(strg){
               strg = strg.replace(/left|top/g,'0px');
               strg = strg.replace(/right|bottom/g,'100%');
               strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
               var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
               return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
           }
        }
	});
})(jQuery);

ただし、jQuery Background Positionからダウンロードしたjquery.bgpos.jsはIE8ではエラーになるので、次の様に修正

(function($) 
{   
    $.extend($.fx.step,
    {       
        backgroundPosition: function(fx) 
        {            
            if (fx.state === 0 && typeof fx.end == 'string') 
            {
                if(navigator.appName == 'Microsoft Internet Explorer')
                {
                    var start = $.curCSS(fx.elem,'backgroundPositionX');
                    start +=  ' ';
                    start += $.curCSS(fx.elem,'backgroundPositionY');
                }
                else
                {
                    var start = $.curCSS(fx.elem,'backgroundPosition');
                }
                start = toArray(start);
                fx.start = [start[0],start[2]];
                var end = toArray(fx.end);
                fx.end = [end[0],end[2]];
                fx.unit = [end[1],end[3]];
            }

            var nowPosX = [];
            nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
            nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
            fx.elem.style.backgroundPosition = nowPosX[0]+' '+nowPosX[1];

            function toArray(strg)
            {               
                strg = strg.replace(/left|top/g,'0px');
                strg = strg.replace(/right|bottom/g,'100%');
                strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g,"$1px$2");
                var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
                return [parseFloat(res[1],10),res[2],parseFloat(res[3],10),res[4]];
            }        
        }   
    });
})(jQuery);

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