javascript - Swiper.js - 在最后一张幻灯片上取消绑定(bind) touchmove 事件，当方向向上时重新绑定(bind) touchmove

Question

我在 Swiper.js 元素下面有一些内容。我正在尝试取消绑定(bind) slider 上的 touchmove 事件，以便在移动设备上，用户在到达幻灯片的最后一张幻灯片时可以自由地向下滚动页面。

然后，当它们位于或接近页面顶部时，或者当 swiper 元素的顶部等于 window.pageYOffset 为 0 时，重新绑定(bind)触摸事件。我正在检测滚动方向，因此该事件可能只需要在方向向上时发生。

Swiper 提供了一个回调 onReadEnd，应该会很有用。

编辑:API 还提供了 onTouchMove 和 onTouchMoveOpposite

相关链接

• Swiper.js API Docs
• CodePen
• CodePen - DEBUG MODE

要正确调试，请使用 Debug模式链接并使用移动模拟器中的开发工具，不要使用鼠标滚轮，仅通过单击拖动来模拟触摸事件。

出于调试目的，我已将 swiper 容器设置为 80% 高度 - 在生产中它将为 100% 视口(viewport)高度。

请随意在解决方案中使用 jQuery，它已包含在项目中。

HTML

<div id="swiper" class="swiper-container">
  <div class="swiper-wrapper">
      <div class="swiper-slide">Slide 1</div>
      <div class="swiper-slide">Slide 2</div>
      <div class="swiper-slide">Slide 3</div>
  </div>
  <div class="swiper-pagination"></div>
</div>

<div class="content">
  <div class="container">
    <h1>Header 1</h1>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestias totam vero fuga dolorum explicabo suscipit aliquam hic blanditiis soluta officiis, corrupti consequatur nostrum sint possimus neque eos temporibus amet placeat.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestias totam vero fuga dolorum explicabo suscipit aliquam hic blanditiis soluta officiis, corrupti consequatur nostrum sint possimus neque eos temporibus amet placeat.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestias totam vero fuga dolorum explicabo suscipit aliquam hic blanditiis soluta officiis, corrupti consequatur nostrum sint possimus neque eos temporibus amet placeat.</p>
    <h2>Header 2</h2>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestias totam vero fuga dolorum explicabo suscipit aliquam hic blanditiis soluta officiis, corrupti consequatur nostrum sint possimus neque eos temporibus amet placeat.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestias totam vero fuga dolorum explicabo suscipit aliquam hic blanditiis soluta officiis, corrupti consequatur nostrum sint possimus neque eos temporibus amet placeat.</p>
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Molestias totam vero fuga dolorum explicabo suscipit aliquam hic blanditiis soluta officiis, corrupti consequatur nostrum sint possimus neque eos temporibus amet placeat.</p>
  </div>
</div>

CSS

html, body {
  position: relative;
  height: 100%;
}
body {
  background: #eee;
  font-family: Helvetica Neue, Helvetica, Arial, sans-serif;
  font-size: 14px;
  color:#000;
  margin: 0;
  padding: 0;
}
.swiper-container {
  width: 100%;
  height: 80%;
}
.swiper-slide {
  text-align: center;
  font-size: 22px;
  background: #fff;

  /* Center slide text vertically */
  display: -webkit-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  -webkit-justify-content: center;
  justify-content: center;
  -webkit-box-align: center;
  -ms-flex-align: center;
  -webkit-align-items: center;
  align-items: center;

  background-size: cover;
  background-position: 50% 50%;
  background-repeat: no-repeat;
}

.content {
  padding: 30px 15px;
}

.container {
  max-width: 1200px;
  margin:0 auto;
}

Javascript

var $el = {
  swiper: document.getElementById('swiper')
}

var swiper = new Swiper('.swiper-container', {
  pagination: '.swiper-pagination',
  paginationClickable: true,
  direction: 'vertical',
  onReachEnd: function(swiperInstance) {
    console.log('onReachEnd(), unbind touchmove')
  },
  onTouchMove: function(swiper, event) {
    // Callback function, will be executed when user touch and move finger over Swiper. Receives swiper instance and 'touchmove' event as an arguments.
  },
  onTouchMoveOpposite: function(swiper, event) {
    //  Callback function, will be executed when user touch and move finger over Swiper in direction opposite to direction parameter. Receives swiper instance and 'touchmove' event as an arguments.
  }
});



// Unsure if below will be needed, could be done all within swiper callbacks


var lastY = 0;
$el.swiper.addEventListener('touchmove', function(event) {
  var currentY = event.touches[0].clientY;
  if ( currentY > lastY ) {
    console.log('up', currentY, lastY)

    // top of page +/- 100px
    // this is inaccurate, currentY is the Y pos of the touch, not
    // equivalent to window.pageYOffset or scrollTop
    if ( currentY <= 100 ) {
      console.log('top of page, rebind touchmove')
    }

  } else if( currentY < lastY ) {
    console.log('down')
  }
  lastY = currentY;
})

Answer 1

我正在一个网站上工作，我也遇到了类似的情况。您必须设置属性 mousewheelControl: true初始化时，您可以使用方法 .disableMousewheelControl()和.enableMousewheelControl() .

链接到示例的暂存站点:http://multiply.website.2017.360southclients.net:8080/services/seo/

下面是相关的JS代码。 (仅供引用 - freezePoint 计算考虑了粘性导航栏和幻灯片上方的 vh 大小的元素)

var serviceSwiper = new Swiper( '.swiper-container', {
  direction: 'vertical',
  slidesPerView: 1,
  mousewheelControl: true,
  mousewheelReleaseOnEdges: true,
  mousewheelSensitivity: .05,
  ...
});

serviceSwiper.disableMousewheelControl();

var freezePoint = 0;

$( window ).on( 'resize', function( e ) {
  freezePoint = Math.ceil( $( '#service-slides' ).offset().top - $( '#header' ).outerHeight() - 50 );
}).trigger( 'resize' );

$( window ).on( 'scroll', function( e ) {
  if ( ! serviceSwiper.isEnd && window.scrollY >= freezePoint || ! serviceSwiper.isBeginning && window.scrollY <= freezePoint ) {
    $( 'html' ).scrollTop( freezePoint );
    if ( ! serviceSwiper.params.mousewheelControl ) {
      serviceSwiper.enableMousewheelControl();
    }
  } else if ( serviceSwiper.params.mousewheelControl ) {
    serviceSwiper.disableMousewheelControl();
  }
});