javascript - 滑动或单击 slider 控件时轮播不正确滑动(下一个/上一个)

我刚刚完成了一个旋转木马的构建，我一直在使用它使用滑动/触摸并使用诸如上一个/下一个控件来控制旋转木马。现在我遇到了关于轮播行为的问题。基本上我想让它一张一张地滑动。这是我一直在处理的代码示例。现在它似乎滑动了 2 或 3，具体取决于我放置的轮播数量。

我也有关于让它响应的问题

function fCarousel() {
  // var activeSlide = 0;
  // $('.faculty-carousel').attr('data-slide', '0');

  var viewPortSize        = $(window).width(),
      facultyPanel = $('.faculty-carousel .faculty-items li'),
      profileCount = facultyPanel.length,
      activeSlide         = 0,
      carousel            = $('.faculty-carousel .faculty-items');

  $('.faculty-carousel').attr('data-slide', '0');

  //Set Panel Size based on viewport

  if (viewPortSize <= 1920 ) {
      var profilePanelSize = viewPortSize / 5
  }

  if (viewPortSize < 1024 ) {
      var profilePanelSize = viewPortSize / 4
  }

  if (viewPortSize < 768 ) {
      var profilePanelSize = viewPortSize / 3
  } 

  if (viewPortSize < 480 ) {
      var profilePanelSize = viewPortSize
  }

  carousel.outerWidth( profilePanelSize * profileCount );
  facultyPanel.outerWidth(profilePanelSize);
  carousel.css('transform', 'translateX(' + 0 + '% )');

  $('.prev').on('click', function(e) {
      event.stopPropagation();

    var carouselWrapper     = $(this).closest('.faculty-carousel'),
        facultyProfilePanel = carouselWrapper.find('.faculty-items li'),
        facultyProfileCount = facultyProfilePanel.length,
        viewPortSize        = $(window).width(),
        carousel = carouselWrapper.find('.faculty-items'),
        position            = 0,
        currentSlide        = parseInt(carouselWrapper.attr('data-slide'));

      // Check if data-slide attribute is greater than 0
      if (currentSlide > 0) {
          // Decremement current slide
          currentSlide--;
          // Assign CSS position to clicked slider
          var transformPercentage = -1 * currentSlide / facultyProfileCount * 100;
          carousel.css('transform', 'translateX(' + transformPercentage + '% )');
          // Update data-slide attribute
          carouselWrapper.attr('data-slide', currentSlide);
          activeSlide = currentSlide;
      }
  });

  $('.next').on('click', function(e) {
      event.stopPropagation();
      // store variable relevent to clicked slider

    var carouselWrapper     = $(this).closest('.faculty-carousel'),
        facultyProfilePanel = carouselWrapper.find('.faculty-items li'),
        facultyProfileCount = facultyProfilePanel.length,
        viewPortSize   = $(window).width(),
        carousel = carouselWrapper.find('.faculty-items'),
        position = 0,
        currentSlide = parseInt(carouselWrapper.attr('data-slide'));

      // Check if dataslide is less than the total slides
      if (currentSlide < facultyProfileCount - 1) {
          // Increment current slide
          currentSlide++;
          // Assign CSS position to clicked slider
          var transformPercentage = -1 * currentSlide / facultyProfileCount * 100;
          carousel.css('transform', 'translateX(' + transformPercentage + '% )');
          // Update data-slide attribute
          carouselWrapper.attr('data-slide', currentSlide);
          activeSlide = currentSlide;
      }
  })

    $('.faculty-carousel .faculty-items').each(function() {

        // create a simple instance
        // by default, it only adds horizontal recognizers

        var direction;
        var touchSlider = this;
        var mc = new Hammer.Manager(this),
            itemLength = $(this).find('li').length,
            count = 0,
            slide = $(this),
            timer;

        var sliderWrapper = slide,
            slideItems = sliderWrapper.find('li'),
            //slider = sliderWrapper.find('li'),
            totalPanels = slideItems.length,
            currentSlide = parseInt(sliderWrapper.attr('data-slide'));

        // mc.on("panleft panright", function(ev) {
        //   direction = ev.type;
        // });

        mc.add(new Hammer.Pan({
            threshold: 0,
            pointers: 0
        }))
        mc.on('pan', function(e) {
            var percentage = 100 / totalPanels * e.deltaX / window.innerWidth;
            var transformPercentage = percentage - 100 / totalPanels * activeSlide;
            touchSlider.style.transform = 'translateX( ' + transformPercentage + '% )';
            var sliderWrapper = $(e.target).closest('.faculty-carousel')


            if (e.isFinal) { // NEW: this only runs on event end

                var newSlide = activeSlide;
                if (percentage < 0)
                    newSlide = activeSlide + 1;
                else if (percentage > 0)
                    newSlide = activeSlide - 1;
                goToSlide(newSlide, sliderWrapper);
            }
        });


        var goToSlide = function(number, sliderWrapper) {
            if (number < 0)
                activeSlide = 0;
            else if (number > totalPanels - 1)
                activeSlide = totalPanels - 1
            else
                activeSlide = number;

            sliderWrapper.attr('data-slide', activeSlide);

            touchSlider.classList.add('slide-animation');
            var percentage = -(100 / totalPanels) * activeSlide;
            touchSlider.style.transform = 'translateX( ' + percentage + '% )';
            timer = setTimeout(function() {
                touchSlider.classList.remove('slide-animation');
            }, 400);

        };
    });

}

$(document).ready(function() {
  fCarousel();
})

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

/* 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;
}
.faculty-items li {
    height : 100px;
}
.faculty-items li:nth-child(odd) {
    background-color : grey;
}
.faculty-items li:nth-child(even) {
    background-color : aqua
}
.faculty-items {
    overflow   : hidden;
    position   : relative;
    right      : 0;
    display : flex;
    -webkit-transition: transform 0.3s linear;
}
.faculty-carousel .controls {
    display : block;
}

<!doctype html>
<html>
<head>
<title>Carousel</title>
<link rel="stylesheet" href="style.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/hammer.js/2.0.8/hammer.min.js"></script>
</head>
<body>
  <div class="faculty-carousel">
    <ul class="faculty-items">
        <li>Item 1</li>
        <li>Item 2</li>
        <li>Item 3</li>
        <li>Item 4</li>
        <li>Item 5</li>
        <li>Item 6</li>
    </ul>

    <div class="controls">
      <div class="prev">
        prev
      </div>

      <div class="next">
        next
      </div>
    </div>
  </div>


  <div class="faculty-carousel">
    <ul class="faculty-items">
        <li>Item 1</li>
        <li>Item 2</li>
        <li>Item 3</li>
        <li>Item 4</li>
        <li>Item 5</li>
        <li>Item 6</li>
    </ul>

    <div class="controls">
      <div class="prev">
        prev
      </div>

      <div class="next">
        next
      </div>
    </div>
  </div>

  <div class="faculty-carousel">
    <ul class="faculty-items">
        <li>Item 1</li>
        <li>Item 2</li>
        <li>Item 3</li>
        <li>Item 4</li>
        <li>Item 5</li>
        <li>Item 6</li>
    </ul>

    <div class="controls">
      <div class="prev">
        prev
      </div>

      <div class="next">
        next
      </div>
    </div>
  </div>
</body>
</html>

最佳答案

好吧，我在这里的第一个回答是匆忙完成的，但我相信我有一个清晰的 JavaScript 表示，可以说明大多数现代轮播的功能，尽管如果您选择使用它，剩下的就取决于您了。

这里很好地解释了 JavaScript 方面的问题

// Index all Carousel
for (var i = 0; i < document.getElementsByClassName("carousel").length; i++) {
    // Create a container for all the slides
    document.getElementsByClassName("carousel")[i].innerHTML = (
        '<div class="slides-container">' +
            document.getElementsByClassName("carousel")[i].innerHTML +
        '</div>'
    );

    // If the Carousel is automated
    if (document.getElementsByClassName("carousel")[i].getAttribute("data-auto")) {
        // Remove all white-space in the Carousel's "data-auto" attribute.
        document.getElementsByClassName("carousel")[i].setAttribute("data-auto", document.getElementsByClassName("carousel")[i].getAttribute("data-auto").replace(/ /g, ""));

        // Set the Carousel direction
        document.getElementsByClassName("carousel")[i]._direction = String(document.getElementsByClassName("carousel")[i].getAttribute("data-auto").slice(0, document.getElementsByClassName("carousel")[i].getAttribute("data-auto").indexOf("_")));

        // Set the Carousel interval
        document.getElementsByClassName("carousel")[i]._interval = (parseFloat(document.getElementsByClassName("carousel")[i].getAttribute("data-auto").slice(document.getElementsByClassName("carousel")[i].getAttribute("data-auto").indexOf("_")).replace("_", "")) * 1000)
    };

    // Index all Carousel slides
    for (var j = 0; j < document.getElementsByClassName("carousel")[i].querySelector(".slides-container").children.length; j++)
        // Hide them
        document.getElementsByClassName("carousel")[i].querySelector(".slides-container").children[j].hidden = true;

        // Show the first one or the specified slide
        document.getElementsByClassName("carousel")[i].querySelector(".slides-container").children[(parseInt(document.getElementsByClassName("carousel")[i].getAttribute("data-active")) || 0)].hidden = false;

    // Carousel Next
    document.getElementsByClassName("carousel")[i]._next = function() {
        // Index all Carousel Slides
        for (var j = 0; j < this.querySelector(".slides-container").children.length; j++)
            // Show the next slide in the set
            if (this.querySelector(".slides-container").children[j].hidden == false) {
                this.querySelector(".slides-container").children[j].hidden = true;
                (this.querySelector(".slides-container").children[j].nextElementSibling || this.querySelector(".slides-container").children[0]).hidden = false;

                break
            }
    };

    // Carousel Previous
    document.getElementsByClassName("carousel")[i]._prev = function() {
        // Index all Carousel Slides
        for (var j = 0; j < this.querySelector(".slides-container").children.length; j++)
            // Show the previous slide in the set
            if (this.querySelector(".slides-container").children[j].hidden == false) {
                this.querySelector(".slides-container").children[j].hidden = true;
                (this.querySelector(".slides-container").children[j].previousElementSibling || this.querySelector(".slides-container").children[this.querySelector(".slides-container").children.length - 1]).hidden = false;

                break
            }
    };

    // Carousel Toggle
    document.getElementsByClassName("carousel")[i]._toggle = function(slideIndex) {
        // Index all Carousel Slides
        for (var j = 0; j < this.querySelector(".slides-container").children.length; j++)
            // Hide them
            this.querySelector(".slides-container").children[j].hidden = true;

        // Show the specified slide
        (this.querySelector(".slides-container").children[slideIndex] || document.createElement("div")).hidden = false
    };

    // If the Carousel Interval is a Number
    if (typeof document.getElementsByClassName("carousel")[i]._interval == "number") {
        // Index
        var index = i;

        // Set an interval to automate the Carousel
        setInterval(function() {
            // If the Carousel direction is right
            if (document.getElementsByClassName("carousel")[index]._direction == "right")
                document.getElementsByClassName("carousel")[index]._next();

            // If the Carousel direction is left
            else if (document.getElementsByClassName("carousel")[index]._direction == "left")
                document.getElementsByClassName("carousel")[index]._prev()
        }, document.getElementsByClassName("carousel")[i]._interval)
    }

    // If the Carousel has buttons
    if (document.getElementsByClassName("carousel")[i].hasAttribute("data-buttons"))
        // Make the Buttons Container
        document.getElementsByClassName("carousel")[i].innerHTML += (
            '<div class="buttons-container">' +
                '<button onclick="this.parentNode.parentNode._prev()"> Previous </button>' +
                '<button onclick="this.parentNode.parentNode._next()"> Next </button>' +
            '</div>'
        )

    // If the Carousel has indicators
    if (document.getElementsByClassName("carousel")[i].hasAttribute("data-indicators"))
        // Make the Indicators Container
        document.getElementsByClassName("carousel")[i].innerHTML += (
            '<div class="indicators-container">' +
                // Place as many checkboxes for as many slides there are
                (function() {
                    var indicators = "";

                    for (var k = 0; k < document.getElementsByClassName("carousel")[i].querySelector(".slides-container").children.length; k++)
                        indicators += (
                            '<input class="indicator-' + k + '" onclick="this.parentNode.parentNode._toggle(this.getAttribute(\'class\')[this.getAttribute(\'class\').length - 1])" type="checkbox">'
                        );

                    return indicators
                })() +
            '</div>'
        );

    // Add a click event to the Carousel
    document.getElementsByClassName("carousel")[i].addEventListener("click", function() {
        // Index all Carousel
        for (var j = 0; j < document.getElementsByClassName("carousel").length; j++)
            // If the Carousel indexed is not the target Carousel
            if (document.getElementsByClassName("carousel")[j] != this)
                // Blur it
                document.getElementsByClassName("carousel")[j].removeAttribute("data-focus");

            else
                // 'Focus' it
                document.getElementsByClassName("carousel")[j].setAttribute("data-focus", "")

        // If the mouse click is to the left of the carousel
        if (event.clientX < (this.getBoundingClientRect().left + (this.getBoundingClientRect().width / 2)))
            this._prev();

        // If the mouse click is to the right of the carousel
        else if ((event.clientX > (this.getBoundingClientRect().left + (this.getBoundingClientRect().width / 2))))
            this._next()
    })
};

// Attach an event to the <body>.
document.body.addEventListener("keydown", function() {
    switch (event.code) {
        // If the left arrow key is pressed
        case "ArrowLeft":
            document.querySelector(".carousel[data-focus")._prev();
            break;

        // If the right arrow key is pressed
        case "ArrowRight":
            document.querySelector(".carousel[data-focus")._next();
            break;
    }
})

在 Carousel 的这部分代码中，.hidden 属性可以替换为任何其他属性，但它给出了幻灯片如何通过事件和非事件状态传递的基本概念。至于HTML部分

<html>
    <body>
        <div class="carousel" data-active="1" data-auto="right_1" data-buttons data-indicators style="height: 300px">
            <div style="background: #F00; color: #FFF; font-size: 50px; height: 100%; line-height: 300px; text-align: center"> R </div>
            <div style="background: #0F0; color: #FFF; font-size: 50px; height: 100%; line-height: 300px; text-align: center"> G </div>
            <div style="background: #00F; color: #FFF; font-size: 50px; height: 100%; line-height: 300px; text-align: center"> B </div>
        </div>

        <!-- The JS script for the Carousel -->
        <script src="carousel.js"> </script>
    </body>
</html>

一切都已简化: carousel 的 class 来制作一个新的 Carousel， data-active 属性表示哪张幻灯片处于事件状态(从 0 开始)， data-auto 属性指定 Carousel 是否自动化(right_ 代表自动化的方向，_1 代表多长时间区间为), data-buttons 属性(如果需要按钮)， data-indicators 如果需要 Carousel indicators 和幻灯片作为旋转木马的 child 。

是的，这几乎就是构建简单轮播所需的 HTML/JS 代码。

如果您正在寻找 JavaScript 世界中发生的任何令人兴奋的事情，我正在开发一个库，我想您可能会对它感兴趣:https://github.com/LapysDev/LapysJS .

关于javascript - 滑动或单击 slider 控件时轮播不正确滑动(下一个/上一个)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45982800/

javascript - 滑动或单击 slider 控件时轮播不正确滑动(下一个/上一个)

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