javascript - 如何向我的 jQuery 图像和文本 slider 添加左/右箭头(下一个/上一个)功能？

Question

这是我目前得到的:http://jsfiddle.net/bpgabrielli/vpfsnhmh/

目前，单击下面的文本链接(“First Seal”等)会使相应的文本/图像淡入。我想添加使用左右箭头转到下一张和上一张幻灯片的选项(也淡入淡出)。如果显示最后一张幻灯片并单击向右箭头，我希望它返回到第一张幻灯片，反之亦然。

欢迎对当前代码提出任何建议或批评。谢谢!

HTML:

<div id="fadebox">
    <img class="fade_arrows" id="left_arrow" src="http://www.clker.com/cliparts/Z/n/k/Z/y/j/left-arrow-gray-hi.png" />
    <div id="fadetxt">
      <h2 class='opaque'>Californian Monk Seal</h2><p class='opaque'>Bacon ipsum dolor amet corned beef drumstick jowl boudin kevin rump bresaola pork belly pig.</p>
      <h2>Leopard Seal</h2><p>Tri-tip hamburger pork belly landjaeger andouille tenderloin. Turkey biltong bacon, filet mignon meatball shankle frankfurter shoulder.</p>
      <h2>New Zealand Fur Seals</h2><p>Ribeye pork belly pancetta hamburger, ham prosciutto pork loin flank beef chicken. Boudin t-bone turkey pastrami chuck. Biltong pork loin alcatra ham hock shank landjaeger.</p>
      <h2>Canadian Baby Seal</h2><p>Jerky sausage strip steak bresaola, pork cow capicola. Pork chop pork boudin tri-tip, frankfurter short loin leberkas capicola kevin shank shoulder rump strip steak cupim jerky.</p>
    </div>
    <div id="fade">
      <img class='opaque' src="http://i.telegraph.co.uk/multimedia/archive/01661/seal_1661793c.jpg" />
      <img src="http://i.telegraph.co.uk/multimedia/archive/01212/seal_1212980c.jpg" />
      <img src="http://images.nationalgeographic.com/wpf/media-live/photos/000/005/cache/fur-seal_531_600x450.jpg" />
      <img src="http://myweb.tiscali.co.uk/ladycroft/seal2.jpg" />
    </div>
    <img class="fade_arrows" id="right_arrow" src="http://guidelinesandprinciples.org/assessment/upload/surveys/117344/images/arrow_right_grey.png" />
</div>  
    <p id="fade_controls">
      <a class="hvr-glow-selected">First Seal</a>
      <a>Second Seal</a>
      <a>Third Seal</a>
      <a>Fourth Seal</a>
    </p>

Javascript:

$(document).ready(function() {
  $("#fade_controls").on('click', 'a', function() {

    $("#fade img").removeClass("opaque");
    var newImage = $(this).index();
    $("#fade img").eq(newImage).addClass("opaque");

    $("#fadetxt h2").removeClass("opaque");
    var newText = $(this).index();
    $("#fadetxt h2").eq(newText).addClass("opaque");

    $("#fadetxt p").removeClass("opaque");
    var newText = $(this).index();
    $("#fadetxt p").eq(newText).addClass("opaque");

    $("#fade_controls a").removeClass("hvr-glow-selected");
    $(this).addClass("hvr-glow-selected");

  });
});

CSS:

#fadebox {
    margin: 0 auto;
    text-align:center;
    z-index: 1;
}

img.fade_arrows {
    width: 30px;
    position: relative;
    margin-bottom: 150px;
    margin-right: 10px;
    margin-left: 10px;
    opacity: 0.3;
    cursor: pointer;
}

img.fade_arrows:hover {
    opacity: 0.6;
}

p#fade_controls {
  text-align:center;
  z-index: 1;
}
#fade_controls a {
/*  margin: .4em;*/
    padding: .7em;
    cursor: pointer;
    background: #e1e1e1;
    text-decoration: none;
    -webkit-tap-highlight-color: rgba(0,0,0,0);
    color: #666;
    width: 80px;
}
#fade_controls a.hvr-glow-selected {
  background: none;
}

#fade_controls a.hvr-glow {
  font-weight: 500;
  display: inline-block;
  vertical-align: middle;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  box-shadow: 0 0 1px rgba(0, 0, 0, 0);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -moz-osx-font-smoothing: grayscale;
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
  -webkit-transition-property: background;
  transition-property: background;
  box-shadow: inset 0 0 0 4px #e1e1e1, 0 0 1px rgba(0, 0, 0, 0);
}

#fade_controls a.hvr-glow:hover, .hvr-glow:focus, .hvr-glow:active {
  background: none;
}


#fade {
  position:relative;
  height:340px;
  width:500px;
  margin:0 auto 10px;
  display: inline-block;
}
#fade img {
  position:absolute;
  left:0;
  -webkit-transition: opacity 0.5s ease-in-out;
  -moz-transition: opacity 0.5s ease-in-out;
  -o-transition: opacity 0.5s ease-in-out;
  transition: opacity 0.5s ease-in-out;
  opacity:0;
  width:500px;
  height:340px;
  -webkit-box-shadow: 0px 1px 30px 0px rgba(176,176,176,1);
  -moz-box-shadow: 0px 1px 30px 0px rgba(176,176,176,1);
  box-shadow: 0px 1px 30px 0px rgba(176,176,176,1);
}
#fade img.opaque {
  opacity:1;
  width:500px;
  height:340px;
  -webkit-box-shadow: 0px 1px 30px 0px rgba(176,176,176,1);
  -moz-box-shadow: 0px 1px 30px 0px rgba(176,176,176,1);
  box-shadow: 0px 1px 30px 0px rgba(176,176,176,1);
}

#fadetxt {
  position:relative;
  height:340px;
  width:300px;
  margin:0 15px 0 0;
  display: inline-block;
}
#fadetxt h2 {
  position:absolute;
  left:0;
  -webkit-transition: opacity 0.5s ease-in-out;
  -moz-transition: opacity 0.5s ease-in-out;
  -o-transition: opacity 0.5s ease-in-out;
  transition: opacity 0.5s ease-in-out;
  opacity:0;
  font-size: 28px;
  font-weight: 300; 
  color: #333;
  text-align:left;
}
#fadetxt h2.opaque {
  opacity:1;
  font-size: 28px;
  font-weight: 300; 
  color: #333;
  text-align:left;
}
#fadetxt p {
  position:absolute;
  left:0;
  -webkit-transition: opacity 0.5s ease-in-out;
  -moz-transition: opacity 0.5s ease-in-out;
  -o-transition: opacity 0.5s ease-in-out;
  transition: opacity 0.5s ease-in-out;
  opacity:0;
  padding-top: 40px;
  text-align:left;
  font-size: 16px;
}
#fadetxt p.opaque {
  opacity:1;
  paddin-top: 40px;
  text-align:left;
    font-size: 16px;
}

Answer 1

$(document).ready(function() {
    var count = $(".slides").length;
    $(".slides").click(function(){
        $(this).fadeOut("fast").removeClass("active");
        $(this).next().fadeIn("slow").addClass("active");
        if($(".slides:last")){
            $(".slides:first").fadeIn("slow").addClass("active");
        }
    });
});

如果您有最后一个子项，则可以通过检查幻灯片的最后一个子项来实现，然后在单击箭头时显示第一个子项。获取幻灯片的长度，如果长度更大，则将显示幻灯片的第一个 child 。