jQueryでスライダー機能を実装 – 横幅いっぱいのスライダーFullWideSlider

body内へ記述

body内のスライダーを表示させたい部分に下記のような要領で記述。以下は３つの画像を切り替える例だが、画像数を増やす場合はli要素を追記するだけ。

<div class="wideslider">
<ul>
<li><a href="#1"><img src="image/sample_001.jpg" width="980" height="340" alt="" /></a></li>
<li><a href="#2"><img src="image/sample_002.jpg" width="980" height="340" alt="" /></a></li>
<li><a href="#3"><img src="image/sample_003.jpg" width="980" height="340" alt="" /></a></li>
</ul>
</div>

cssの記述

.wideslider {
width: 100%;
height: 500px;
text-align: left;
position: relative;
overflow: hidden;
}
.wideslider ul,
.wideslider ul li {
float: left;
display: inline;
overflow: hidden;
}
.wideslider_base {
top: 0;
position: absolute;
}
.wideslider_wrap {
top: 0;
position: absolute;
overflow: hidden;
}
.slider_prev,
.slider_next {
top: 0;
overflow: hidden;
position: absolute;
z-index: 100;
cursor: pointer;
}
.slider_prev {background: #fff url(../img/prev.jpg) no-repeat right center;}
.slider_next {background: #fff url(../img/next.jpg) no-repeat left center;}
.pagination {
bottom: 10px;
left: 0;
width: 100%;
height: 15px;
text-align: center;
position: absolute;
z-index: 200;
}
.pagination a {
margin: 0 5px;
width: 15px;
height: 15px;
display: inline-block;
overflow: hidden;
background: #333;
}
.pagination a.active {
filter:alpha(opacity=100)!important;
-moz-opacity: 1!important;
opacity: 1!important;
}
.wideslider ul:after {
content: ".";
height: 0;
clear: both;
display: block;
visibility: hidden;
}
.wideslider ul {
display: inline-block;
overflow: hidden;
}

scriptの記述

head内に下記scriptを貼り付ける。またはjsファイルに分けて読み込む。

<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
	var $setElm = $('.wideslider'),
	baseWidth = 800,
	baseHeight = 500,
	slideSpeed = 500,
	delayTime = 5000,
	easing = 'linear',
	autoPlay = '1', // notAutoPlay = '0'
	btnOpacity = 0.5,
	pnOpacity = 0.5;
	$setElm.each(function(){
		var targetObj = $(this);
		var widesliderWidth = baseWidth;
		var widesliderHeight = baseHeight;
		targetObj.children('ul').wrapAll('<div class="wideslider_base"><div class="wideslider_wrap"></div><div class="slider_prev"></div><div class="slider_next"></div></div>');
		var findBase = targetObj.find('.wideslider_base');
		var findWrap = targetObj.find('.wideslider_wrap');
		var findPrev = targetObj.find('.slider_prev');
		var findNext = targetObj.find('.slider_next');
		var baseListWidth = findWrap.children('ul').children('li').width();
		var baseListCount = findWrap.children('ul').children('li').length;
		var baseWrapWidth = (baseListWidth)*(baseListCount);
		var pagination = $('<div class="pagination"></div>');
		targetObj.append(pagination);
		var baseList = findWrap.children('ul').children('li');
		baseList.each(function(i){
			$(this).css({width:(baseWidth),height:(baseHeight)});
			pagination.append('<a href="javascript:void(0);" class="pn'+(i+1)+'"></a>');
		});
		var pnPoint = pagination.children('a');
		var pnFirst = pagination.children('a:first');
		var pnLast = pagination.children('a:last');
		var pnCount = pagination.children('a').length;
		pnPoint.css({opacity:(pnOpacity)}).hover(function(){
			$(this).stop().animate({opacity:'1'},300);
		}, function(){
			$(this).stop().animate({opacity:(pnOpacity)},300);
		});
		pnFirst.addClass('active');
		pnPoint.click(function(){
			if(autoPlay == '1'){clearInterval(wsSetTimer);}
			var setNum = pnPoint.index(this);
			var moveLeft = ((baseListWidth)*(setNum))+baseWrapWidth;
			findWrap.stop().animate({left: -(moveLeft)},slideSpeed,easing);
			pnPoint.removeClass('active');
			$(this).addClass('active');
			if(autoPlay == '1'){wsTimer();}
		});
		var makeClone = findWrap.children('ul');
		makeClone.clone().prependTo(findWrap);
		makeClone.clone().appendTo(findWrap);
		var allListWidth = findWrap.children('ul').children('li').width();
		var allListCount = findWrap.children('ul').children('li').length;
		var allLWrapWidth = (allListWidth)*(allListCount);
		var windowWidth = $(window).width();
		var posAdjust = ((windowWidth)-(baseWidth))/2;
		findBase.css({left:(posAdjust),width:(baseWidth),height:(baseHeight)});
		findPrev.css({left:-(baseWrapWidth),width:(baseWrapWidth),height:(baseHeight),opacity:(btnOpacity)});
		findNext.css({right:-(baseWrapWidth),width:(baseWrapWidth),height:(baseHeight),opacity:(btnOpacity)});
		$(window).bind('resize',function(){
			var windowWidth = $(window).width();
			var posAdjust = ((windowWidth)-(baseWidth))/2;
			findBase.css({left:(posAdjust)});
			findPrev.css({left:-(posAdjust),width:(posAdjust)});
			findNext.css({right:-(posAdjust),width:(posAdjust)});
		});
		findWrap.css({left:-(baseWrapWidth),width:(allLWrapWidth),height:(baseHeight)});
		findWrap.children('ul').css({width:(baseWrapWidth),height:(baseHeight)});
		var posResetNext = -(baseWrapWidth)*2;
		var posResetPrev = -(baseWrapWidth)+(baseWidth);
		if(autoPlay == '1'){wsTimer();}
		function wsTimer(){
			wsSetTimer = setInterval(function(){
				findNext.click();
			},delayTime);
		}
		findNext.click(function(){
			findWrap.not(':animated').each(function(){
				if(autoPlay == '1'){clearInterval(wsSetTimer);}
				var posLeft = parseInt($(findWrap).css('left'));
				var moveLeft = ((posLeft)-(baseWidth));
				findWrap.stop().animate({left:(moveLeft)},slideSpeed,easing,function(){
					var adjustLeft = parseInt($(findWrap).css('left'));
					if(adjustLeft == posResetNext){
						findWrap.css({left: -(baseWrapWidth)});
					}
				});
				var pnPointActive = pagination.children('a.active');
				pnPointActive.each(function(){
					var pnIndex = pnPoint.index(this);
					var listCount = pnIndex+1;
					if(pnCount == listCount){
						pnPointActive.removeClass('active');
						pnFirst.addClass('active');
					} else {
						pnPointActive.removeClass('active').next().addClass('active');
					}
				});
				if(autoPlay == '1'){wsTimer();}
			});
		}).hover(function(){
			$(this).stop().animate({opacity:((btnOpacity)+0.1)},100);
		}, function(){
			$(this).stop().animate({opacity:(btnOpacity)},100);
		});
		findPrev.click(function(){
			findWrap.not(':animated').each(function(){
				if(autoPlay == '1'){clearInterval(wsSetTimer);}
				var posLeft = parseInt($(findWrap).css('left'));
				var moveLeft = ((posLeft)+(baseWidth));
				findWrap.stop().animate({left:(moveLeft)},slideSpeed,easing,function(){
					var adjustLeft = parseInt($(findWrap).css('left'));
					var adjustLeftPrev = (posResetNext)+(baseWidth);
					if(adjustLeft == posResetPrev){
						findWrap.css({left: (adjustLeftPrev)});
					}
				});
				var pnPointActive = pagination.children('a.active');
				pnPointActive.each(function(){
					var pnIndex = pnPoint.index(this);
					var listCount = pnIndex+1;
					if(1 == listCount){
						pnPointActive.removeClass('active');
						pnLast.addClass('active');
					} else {
						pnPointActive.removeClass('active').prev().addClass('active');
					}
				});
				if(autoPlay == '1'){wsTimer();}
			});
		}).hover(function(){
			$(this).stop().animate({opacity:((btnOpacity)+0.1)},100);
		}, function(){
			$(this).stop().animate({opacity:(btnOpacity)},100);
		});
	});
});
</script>

３．問題点

FullWideSliderは設置もとても簡単であり、細かいところまで設定可能で、個人的には理想の動きをしてくれる横幅いっぱいのスライダーであった。

しかし自分の環境では、FireFoxでは特に問題なく動作したものの、ieで使用した場合(ie9)スライド回数が増すごとに画像の位置がずれてきて、ある程度ずれが蓄積された段階で一切画像が表示されなくなるという不具合（？）があった。

コードを追って原因を追究するよりも、おそらく別のものを試したほうが早いと判断し、別のものを試すことにした。