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

以前のエントリー jQueryでスライダー機能を実装 – jQuery slider2 で、jQueryスライダー設置の練習が済んだところで、少々本格的な「横幅いっぱい」のjQueryスライダーを設置してみたのでメモ。

実践Webデザイン jQuery+CSSフレームワークでサクサクつくる「動き」と「仕掛け」

作者: ワークス,アルディート
出版社/メーカー: エムディエヌコーポレーション
発売日: 2013/08/01
メディア: 単行本
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１．横幅いっぱいのスライダーとは

昨今のWebサイトでよく見られる、横方向に画像を流すスライダーをのことをここでは「横幅いっぱいのスライダー」と呼ぶことにする。企業サイトなどでもよく見かける。

今回は、中央に位置するメインの画像以外、左右の画像は透過させたように表示させるようなものを探した。例えば下図のようなもの。

放っておくと設定秒数おきに画像が切り替わるが、nextボタンやbackボタンクリックでも左右の画像へ移動できる。ものによってはページネーションを表示させることが可能なものもある。

f:id:kojikoji75:20130720182345p:plain

２．jQuery FullWideSliderの設置方法

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>