javascript - 在轮播循环中正确地添加元素

Question

我正在尝试解决一个问题，即当我触发轮播上的 previous 按钮以添加元素时，元素从最后一个位置弹出到第一个位置。我做了一个循环，这样当我按下触发器时， slider 将首先滑动，然后轮播上的最后一个元素将从最后一个位置移动到第一个位置。不幸的是，如果您检查下面的代码，转换并不顺利。 jquery prepend 在将最后一个元素从最后一个位置移动到第一个位置之前有一个小的延迟。是否有适当的方法来实现循环。

(function ($) {
        'use strict';

        var carousel = {

            init : function() {

                var carouselWidth = 0,
                    itemListContainer = $('.item-list').width(),
                    itemList = $('.carousel .item-list ul li'),
                    containerWidth = $('.carousel .item-list').innerWidth(),
                    browserWidth = $(window).width(),
                    itemWidth = itemList.outerWidth( containerWidth / 3 ),
                    itemSize = itemWidth.outerWidth();


                //Set Container Width
                $('.carousel .item-list ul').children().each(function() {
                    carouselWidth += $(this).outerWidth(true);
                    $('.carousel .item-list ul').outerWidth(carouselWidth);
                });


                var offset = itemSize * 3;
              

               // function dynamicItemWidth() {
               //      if ( $('body') <= 1024 ) {
               //          itemWidth = itemList.width( itemListContainer / 5 );
               //      }

               //      if ( $('body') <= 480 ) {
               //          itemWidth = itemList.width( itemListContainer / 2 );
               //      }

               //      if ( $('body') <= 320 ) {
               //          itemWidth = itemList.width( itemListContainer / 1 );
               //      }

               //  }

                // var itemWidth = itemList.width( browserWidth / 5 ),
                //     itemSize = itemWidth.width();

                $('.carousel .item-list ul').prepend( $('.carousel .item-list ul li:last') );

                $('.carousel .item-list ul').css('left', '-' +  itemSize + 'px'  );


                $('.btns .next').click(function(){

                    var move = $('.carousel .item-list ul li').outerWidth();
                    var leftIndent = parseInt($('.carousel .item-list ul').css('left')) - move;

                    function animate( repeat, speed ) {
                        $('.carousel .item-list ul:not(:animated)').animate({'left' : leftIndent}, speed,function(){
                            $('.carousel .item-list ul').append( $('.carousel .item-list ul li:first') );
                            $('.carousel .item-list ul').css({'left' : '-' +  move + 'px'});

                            if ( repeat > 1 ) {
                                animate( ( repeat - 1 ), speed );                     }
                        });
                    }

                    animate( 1, 300 );

                });

                $('.btns .prev').click(function() {

                    var move = $('.carousel .item-list ul li').outerWidth();
                    var leftIndent = parseInt($('.carousel .item-list ul').css('left')) + move;

                    function animate( repeat, speed ) {
                        $('.carousel .item-list ul:not(:animated)').animate({'left' : leftIndent}, speed,function(){
                            $('.carousel .item-list ul').prepend($('.carousel .item-list ul li:last'));
                            $('.carousel .item-list ul').css({'left' : '-' + move + 'px'});

                            if ( repeat > 1 ) {
                                animate( ( repeat - 1 ), speed );
                            }
                        });
                    }

                    animate( 1, 300 );

                });

            }

        }

        $(document).ready(function(){
            carousel.init();
        });


        $(window).on('resize', function() {
            carousel.init();  
        })

    })(jQuery);

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video {
   margin: 0;
   padding: 0;
   border: 0;
   font-size: 100%;
   font: inherit;
   vertical-align: baseline;
}

/* HTML5 display-role reset for older browsers */

article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section {
   display: block;
}

body {
   line-height: 1;
}

ol, ul {
   list-style: none;
}

blockquote, q {
   quotes: none;
}

blockquote:before, blockquote:after, q:before, q:after {
   content: '';
   content: none;
}

table {
   border-collapse: collapse;
   border-spacing: 0;
}

* {
   -webkit-box-sizing: border-box;
   -moz-box-sizing: border-box;
   box-sizing: border-box;
}

/* -- #Carousel -- */

.carousel {
   position: relative;
}

.carousel .item-list {
   max-width: 1366px;
   margin: 0 auto;
   border: 1px solid #000;
   box-sizing: content-box;
}

.carousel .item-list ul {
   display: flex;
   flex-wrap: wrap;
   list-style: none;
   margin-bottom: 10px;
   position: relative;
   overflow: hidden;
}

.carousel .btns {
   width: 100%;
   z-index: 10;
   top: 50%;
}

.carousel .btns li {
   display: inline-block;
   cursor: pointer;
}

.carousel.-aim-partners {
   position: relative;
}

.carousel.-aim-partners .item-list {
   margin: 0 auto;
}

.carousel.-aim-partners .item-list ul li {
   float: left;
   width: 230px;
   height: 110px;
   margin-top: 10px;
   margin-bottom: 10px;
   background-size: contain;
   background-repeat: no-repeat;
   background-position: center;
   background-color: beige;
}

.carousel.-aim-partners .btns {
   width: 110%;
   left: -70px;
}

.carousel.-aim-partners .btns li {
   width: 35px;
   height: 40px;
}

.carousel.-aim-partners .btns li.prev {
   background: url("../images/carousel-icon-arrow.png") no-repeat 15px 0;
}

.carousel.-aim-partners .btns li.next {
   background: url("../images/carousel-icon-arrow.png") no-repeat -20px 0;
}

/* -- End Carousel -- */

/*# sourceMappingURL=style.css.map */

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="wrapper">
    <div class='carousel -aim-partners'>

      <div class='item-list'>
          <ul>
              <li>1</li>
              <li>2</li>
              <li>3</li>
              <li>4</li>
              <li>5</li>
              <li>6</li>
              <li>7</li>
              <li>8</li>
              <li>9</li>
              <li>10</li>
              <li>11</li>
              <li>12</li>
              <li>13</li>
              <li>14</li>
              <li>15</li>
              <li>16</li>             
              
          </ul>
      </div>


        <ul class="btns">
            <li class="prev">
                <i class="fa fa-angle-left" aria-hidden="true">prev</i>
            </li>
            <li class="next">
                <i class="fa fa-angle-right" aria-hidden="true">next</i>
            </li>
        </ul>

    </div>
</div>

Answer 1

改变动画的方式会影响 View 。结帐this fiddle .我使用不同的动画方法创建了一个简单的示例。

$('.prev').click(function(){
  $('.slide li:last').css('width',0);
  $('.slide li:last').prependTo('.slide');
  $('.slide li:first').animate({width: '98px'});
});