弹出窗口的上一个和下一个按钮功能

Question

我有一个电子商务网站的项目库，当我将鼠标悬停在其中一个项目上时，将在其上显示“快速查看”按钮，如果单击此按钮，则会显示一个弹出窗口，并带有“上一页”和“下一个”按钮。我想知道如何使这些上一个和下一个按钮起作用，因为弹出窗口显示的内容基于被单击的项目，并且每个项目都有不同的内容（img，价格等）。如果可能的话，如果弹出窗口显示的是第一项，则我想使“上一个”按钮消失，而“下一个”按钮则相反。任何帮助将不胜感激。

// Open popup shop item
  $('.quickview__icon').click(function() {
    $('.overlay').css({'opacity': '1', 'visibility': 'visible'});

    // Change popup clothing-item: img, name, price
    var imgid = "#"+$(this).attr('id').replace(/\s/g,'') + "Img";
    var imgsrc = $(imgid).prop('src');
    var price = document.getElementById($(this).attr('id').replace(/\s/g,'') + "Price").innerHTML;
    $('#clothingImg').prop('src', imgsrc);
    document.getElementById('clothingName').innerHTML = $(this).attr('id');
    document.getElementById("clothingPrice").innerHTML = price;
  });

  // Popup close
  $('#closeIcon').click(function() {
    $('.popup, .overlay').css({
      'opacity': '0',
      'visibility': 'hidden'});
      $('body').css('overflow', 'visible');

  })

* {
  margin: 0;
  padding: 0;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

html {
  box-sizing: border-box;
  font-size: 62.5%;
  -webkit-font-smoothing: subpixel-antialiased;
}

body {
  font-family: "Karla", sans-serif;
  font-weight: 400;
  line-height: 1.6;
  color: #222;
}

.products-container {
  display: flex;
}
.container {
  padding: 4rem 5rem !important;
}

.shop-item {
  width: calc(100% / 4);
  margin: 1.5rem;
  position: relative;
  display: flex;
  justify-content: center;
}

.shop-item__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.quickview {
  width: 100%;
  height: 100%;
  position: absolute;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-content: center;
  padding-bottom: 2rem;
  color: #222;
  letter-spacing: 0.15rem;
  text-transform: uppercase;
  opacity: 0;
  transition: all ease-in-out 250ms;
}

.quickview:hover {
  opacity: 1;
}

.quickview__icon {
  font-size: 1rem;
  background-color: rgba(204, 204, 204, 0.9);
  padding: 0.7rem 1rem;
  align-self: center;
}

.quickview__info {
  font-size: 1.2rem;
  align-self: center;
  text-align: center;
}

.quickview__info--price {
  font-size: 1rem;
  color: rgba(61, 61, 61, 0.6);
}

.popup {
  height: 100vh;
  width: 100%;
  background-color: rgba(245, 239, 236, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: all ease-in-out 250ms;
}

.popup__img {
  height: 95%;
}

.popup__close-icon {
  position: absolute;
  top: 1rem;
  right: 2.5rem;
  font-size: 3rem;
  color: #d1d1d1;
  cursor: pointer;
  transition: all ease-in-out 250ms;
}

.popup__close-icon:hover {
  color: rgba(61, 61, 61, 0.6);
}

.popup__close-icon-clothing {
  position: absolute;
  font-size: 3.6rem;
  font-weight: lighter;
  color: #222;
  top: -1rem;
  right: 1.5rem;
  cursor: pointer;
}

.overlay {
  position: fixed;
  overflow-y: scroll;
  overscroll-behavior: contain;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  opacity: 0;
  visibility: hidden;
  background-color: rgba(240, 240, 240, 0.6);
}

.popup-item {
  width: 75%;
  height: 150vh;
  background-color: #fff;
  margin: 5rem auto;
  display: flex;
  justify-content: center;
}

.product-info {
  padding: 5rem 3.5rem;
  letter-spacing: 0.1rem;
  color: #222;
}

.product-info--shop {
  padding: 0 3.5rem;
}

.product-info__price {
  font-size: 2.4rem;
  margin: 3rem 0;
  display: block;
  color: rgba(29, 29, 29, 0.7);
}

.product-info__text {
  font-size: 1.4rem;
  margin-bottom: 3rem;
  color: rgba(29, 29, 29, 0.7);
}

.detail-group {
  color: #222;
  margin-bottom: 4rem;
}

.detail-group__span {
  font-size: 1.1rem;
  text-transform: uppercase;
}

.detail-group__size {
  width: 12.5rem;
  font-size: 1.1rem;
  letter-spacing: 0.1rem;
  padding: 1.1rem 2rem;
  margin-top: 0.5rem;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border-radius: 0;
  border: 0;
  outline: none;
  background: url(../img/down-arrow.png) 85%/7% no-repeat #f8f8f8;
}

.detail-group__quantity {
  width: 7.5rem;
  padding: 1.1rem 1.6rem;
  margin-top: 0.5rem;
  outline: none;
  border: 0;
  background-color: #f8f8f8;
}

.clothing-item-flex {
  height: 100%;
  background-color: #fff;
  display: flex;
}

.clothing-item-flex__img-wrapper {
  min-width: 60%;
  margin: 1.5rem;
  overflow: hidden;
}

.clothing-item-flex__img-wrapper--no-margin {
  margin: 0;
}

.clothing-item-flex__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.btn {
  display: inline-block;
  font-size: 1.2rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2rem;
  padding: 1.2rem 2.6rem;
  border: 2px solid #fff;
  color: #fff;
  text-decoration: none;
  outline: none;
  transition: all 250ms ease-in-out;
}
.btn:hover {
  color: #222;
  background-color: #fff;
}
.btn--form {
  color: #222;
  border: 2px solid black;
  font-weight: 400;
  padding: 1.4rem 3.5rem;
  cursor: pointer;
}
.btn--form:hover {
  color: #fff;
  background-color: #222;
}
.btn--form--shop {
  padding: 2.3rem 3.4rem;
}

.btn-view {
  display: block;
  width: 10.5rem;
  margin-top: 4rem;
  font-size: 1.4rem;
  letter-spacing: 0.1rem;
  text-decoration: none;
  color: rgba(61, 61, 61, 0.6);
  border-bottom: 1px solid rgba(162, 162, 162, 0.7);
}

.popup-btn {
  width: 3rem;
  height: 3rem;
  position: absolute;
  top: 50%;
  right: 9%;
  cursor: pointer;
}
.popup-btn--prev {
  transform: rotate(180deg);
  left: 9%;
}
.popup-btn__icon {
  height: 100%;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<section class="products-container container">
  <a href="#" class="shop-item">
    <img src="https://static1.squarespace.com/static/560c458be4b0af26f729d191/560c5de0e4b083d9c365515f/560d4f67e4b00b2c2a29ab00/1443712877696/lauren-winter-haori-jacket_0250.jpg?format=750w" alt="Clothing item" class="lazy shop-item__img" id="HaoriJacketImg">
    <div class="quickview">
      <span class="quickview__icon" id="Haori Jacket">Quick View</span>
      <span class="quickview__info">Haori jacket<br><span class="quickview__info--price" id="HaoriJacketPrice">$210.00</span></span>
    </div>
  </a>
  <a href="#" class="shop-item">
          <img src="https://static1.squarespace.com/static/560c458be4b0af26f729d191/560c5de0e4b083d9c365515f/560d5226e4b0e3eb29871ecf/1443713579307/lauren-winter-swing-dress_0183.jpg?format=2500w" alt="Clothing item" class="lazy shop-item__img" id="SwingDressImg">
          <div class="quickview">
            <span class="quickview__icon" id="Swing Dress">Quick View</span>
            <span class="quickview__info">Swing dress<br><span class="quickview__info--price" id="SwingDressPrice">$218.00</span></span>
          </div>
        </a>
        <a href="#" class="shop-item">
          <img src="https://static1.squarespace.com/static/560c458be4b0af26f729d191/560c5de0e4b083d9c365515f/560d4fd9e4b03b1013fd1f56/1443712996946/lauren-winter-lounge-jumpsuit-black_0284.jpg?format=750w" alt="Clothing item" class="lazy shop-item__img" id="LoungeJumpsuitImg">
          <div class="quickview">
            <span class="quickview__icon" id="Lounge Jumpsuit">Quick View</span>
            <span class="quickview__info">Lounge Jumpsuit<br><span class="quickview__info--price" id="LoungeJumpsuitPrice">$298.00</span></span>
          </div>
        </a>
        <a href="#" class="shop-item">
          <img src="https://static1.squarespace.com/static/560c458be4b0af26f729d191/560c5de0e4b083d9c365515f/560d542ae4b088b5adb66691/1443714094740/ulihu-blue-linen-crop-top_0320.jpg?format=750w" alt="Clothing item" class="lazy shop-item__img" id="LinenTopImg">
          <div class="quickview">
            <span class="quickview__icon" id="Linen Top">Quick View</span>
            <span class="quickview__info">Linen top<br><span class="quickview__info--price" id="LinenTopPrice">$125.00</span></span>
          </div>
        </a>
</section>

<!-- Popup Shop Item -->

<div class="overlay">
  <div class="popup-btn popup-btn--prev">
    <img src="https://image.flaticon.com/icons/svg/60/60758.svg" alt="Previous button" class="popup-btn__icon">
  </div>
  <div class="popup-item">
    <div class="clothing-item-flex">
      <div class="clothing-item-flex__img-wrapper">
        <img src="" alt="Clothing item" class="clothing-item-flex__img zoom-normal" id="clothingImg">
      </div>
      <div class="product-info">
        <h2 class="heading-secondary" id="clothingName"></h2>
        <span class="product-info__price" id="clothingPrice"></span>
        <p class="product-info__text">Sed ornare tellus non lectus blandit faucibus. Curabitur convallis nibh ut libero lobortis ullamcorper. Aliquam ornare risus in orci iaculis egestas. Vivamus varius ipsum eu leo ...</p>
        <div class="detail-group">
          <p class="detail-group__span">Size:</p>
          <select class="detail-group__size">
            <option value="">Select Size</option>
            <option value="0">0</option>
            <option value="2">2</option>
            <option value="4">4</option>
            <option value="6">6</option>
            <option value="8">8</option>
          </select>
        </div>
        <div class="detail-group">
          <p class="detail-group__span">Quantity:</p>
          <input class="detail-group__quantity" max="9999" min="1" value="1" type="number">
        </div>
        <button type="button" class="btn btn--form btn--form--shop">Add to cart</button>
        <a href="" class="btn-view">View Full Item</a>
      </div>
    </div>
    <span class="popup__close-icon-clothing" id="closeIcon">&times;</span>
  </div>
  <div class="popup-btn">
    <img src="https://image.flaticon.com/icons/svg/60/60758.svg" alt="Next button" class="popup-btn__icon">
  </div>
</div>