设置父div的定位固定元素宽度不起作用

Question

我正在尝试修复位置元素，并采用父div的全宽度。这是我的HTML：

     <div class="col-md-3">
        <div class="player-avatar-card">
          <div class="card-body">
            <div class="avatar-image">
              <img src="/imagecache/small/{{ $player->image_filename }}" alt="Profile Image" class="rounded-circle">
              <img class="flag rounded-circle" src="/icons/flags-round/{{ $player->nationality }}.svg"></h3>
            </div>
            <h5>{{ $player->first_name }} {{ $player->last_name }}</h5>
            <p>{{ $player->nationality }}, {{ $player->age }} years</p>
            <div class="social-buttons">
              <div class="col-12">
                <a class="btn btn-info btn-lg" href="#" role="button">
                  <i class="ion-plus-round"></i> follow</a>
              </div>
              <div class="col-12">
                <a class="btn btn-info btn-outline-info" href="#" role="button">
                  <i class="ion-android-share-alt"></i> share</a>
              </div>
            </div>
          </div>
        </div>
      </div>

我正在向player-avatar-card提供定位修正课程，滚动到元素：

  const avatarCard = document.querySelector('.player-avatar-card');
  const fixClassAvatar = 'is-fixed-avatar';

  function stickyScroll() {
    if( window.pageYOffset > 56 ) {
      avatarCard.classList.add(fixClassAvatar);
    }
    if( window.pageYOffset < 56 ) {
      avatarCard.classList.remove(fixClassAvatar);
    }
  }
  $(window).scroll(stickyScroll);

这是班级：

.is-fixed-avatar {
  position: fixed;
  max-width: inherit;
  width: 100%;
}

但是，该元素超出了col-md-3 div，我该如何解决？

Here是小提琴。确保在屏幕上展开它，使其宽度足以使其正常工作。

Answer 1

如果使用position: fixed，div将从流中取出，从而从col-md-3 div中取出。我建议absolute：

.profile-content .player-info .is-fixed-avatar {
  position: absolute;
  left: 0;
  right: 0;
}

现在您可以使用 jQuery 将一些粘性放到avatar - 通过最小化窗口高度来检查它。请参阅下面的简化演示（最后section-card位于col-md-9内）：

$(document).ready(function() {
  const avatar = $('.player-avatar-card');
  const avatarBox = avatar.parent();

  function sticky() {
    var offset = avatarBox.offset().top - $(window).scrollTop();
    if (offset >= 0) {
      avatar.css('top', '0');
      return;
    }
    avatar.offset({
      'left': avatar.offset().left,
      'top': -offset + 90 // 90px to adjust for padding
    });
  }
  $(window).scroll(sticky);
});

body {
  background: #fff;
  color: #484848 !important;
}

.is-fixed {
  position: fixed;
  left: 0;
  right: 0;
  z-index: 10;
  top: 0;
}

.page-nav {
  height: 56px;
  border-bottom: 1px solid #f1eeee;
  box-shadow: 0 1px 5px rgba(0, 0, 0, 0.1);
  background: #fff;
}

.page-nav .section-links .active {
  border-bottom: 2px solid #008489;
  color: #008489;
  font-weight: 500;
}

.page-nav .nav {
  height: 56px;
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
  align-items: center;
}

.page-nav .nav .nav-link {
  height: 56px;
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
  align-items: center;
  min-width: 100px;
  -webkit-box-pack: center;
  justify-content: center;
  color: #484848;
}

.lg-strong-font {
  font-size: 34px;
  font-weight: 500;
  color: #e90052;
}

.lg-strong-font span {
  font-size: 1rem;
}

.profile-content {
  padding: 2rem 0;
  background: #f7f7f7;
}

.profile-content .info-content {
  padding-left: 3rem;
  padding-right: 3rem;
}

.profile-content .title-margin {
  margin-bottom: 1.5rem;
}

.profile-content .title-icon {
  color: #008489;
  margin-right: 1.7rem;
  margin-left: 2px;
}

.profile-content .info-title-hr {
  margin-left: 3rem;
  margin-right: 3rem;
}

.profile-content .section-card {
  margin-top: 1.5rem;
  background: #fff;
  padding: 1.5rem;
  border: 1px solid #f1eeee;
}

.profile-content .sub-section {
  margin-top: 2rem;
}

.profile-content .icon-wrapper {
  width: 30px;
  height: 30px;
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
  align-items: center;
  -webkit-box-pack: center;
  justify-content: center;
}

.profile-content .icon-wrapper i {
  color: #008489;
}

.profile-content .video-section {
  margin: 0;
  margin-left: -5px;
}

.profile-content .video-section .profile-video-box {
  padding: 0;
  padding-left: 5px;
  margin-bottom: 10px;
}

.profile-content .player-info .icon-box {
  padding-right: 0;
  padding-top: 8px;
}

.profile-content .player-info .player-info-card-content {
  margin-top: 0;
}

.profile-content .player-info .is-fixed-avatar {
  position: absolute;
  left: 0;
  right: 0;
}

.profile-content .player-info .player-avatar-card {
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem 0;
  border: 1px solid #f1eeee;
  background: #fff;
}

.profile-content .player-info .player-avatar-card .card-body {
  width: 100%;
}

.profile-content .player-info .player-avatar-card p {
  margin-bottom: 0.2rem;
  font-size: 0.8rem;
  color: #7b7b7b;
}

.profile-content .player-info .player-avatar-card .avatar-image {
  position: relative;
  margin-bottom: 1.5rem;
  display: inline-block;
}

.profile-content .player-info .player-avatar-card .avatar-image img {
  width: 120px;
  height: 120px;
}

.profile-content .player-info .player-avatar-card .avatar-image .flag {
  position: absolute;
  bottom: 10px;
  right: -5px;
  width: 35px;
  height: 35px;
  border: 3px solid #fff;
}

.profile-content .player-info .player-avatar-card .icon {
  width: 30px;
  height: 30px;
  margin-right: 5px;
}

.profile-content .player-info .player-avatar-card .card-title {
  margin: 0.5rem 0;
}

.profile-content .player-info .social-buttons {
  margin-top: 1rem;
}

.profile-content .player-info .social-buttons .btn {
  border-radius: 200px;
  font-weight: 500;
  margin: 0.5rem;
}

.profile-content .player-info .social-buttons .btn i {
  margin-right: 10px;
}

.profile-content .table>thead>tr>th,
.profile-content .table>tbody>tr>th,
.profile-content .table>tfoot>tr>th,
.profile-content .table>thead>tr>td,
.profile-content .table>tbody>tr>td,
.profile-content .table>tfoot>tr>td {
  line-height: 1.42857143;
  vertical-align: top;
  border: 0 !important;
}

.profile-content .table>thead>tr>th {
  text-align: center;
}

.profile-content .table>thead>tr>th .icon-wrapper {
  margin: auto;
}

.profile-content .table>thead>tr>th,
.profile-content .table>tbody>tr>td {
  max-width: 110px !important;
  vertical-align: middle;
}

.profile-content .table>thead {
  border-bottom: 1px solid #f1eeee;
  background: #fff;
}

.profile-content .table-responsive {
  margin-bottom: 0;
}

.profile-content .no-data-message {
  margin-top: 1.5rem;
}

.profile-content .years {
  font-size: 14px;
  font-weight: 500;
}

.profile-content .info-label {
  font-weight: 400;
  font-size: 0.8rem;
  color: #7b7b7b;
}

footer {
  height: 20rem;
  padding: 20px 0;
  position: relative;
  z-index: 1;
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
  align-items: center;
  background-color: #fff;
  color: #3c3e42;
  border-top: 1px solid rgba(204, 204, 204, 0.4);
}

footer h4 {
  font-weight: 700;
}

footer a {
  display: block;
  font-weight: 500;
  margin-bottom: 10px;
}

.search-result {
  margin-top: 2rem;
}

.search-result .search-list {
  margin-top: 1rem;
}

.search-result .query-card {
  color: #fff;
  background: #00bcd4;
}

.search-result .query-card .card-block {
  padding: 1rem;
}

.search-result .search-list-media .media img {
  width: 160px;
  height: auto;
}

.search-result .media {
  margin-top: 10px !important;
}

.search-result .media-body p {
  margin: 0 !important;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

.search-result .tab-content {
  padding: 1rem;
}

.search-result .pagination,
.search-result .tab-content {
  margin-top: 2rem;
}

.contact-form .card {
  padding: 1rem;
}

body {
  overflow-x: hidden;
  position: relative;
}

#wrapper {
  position: relative;
  z-index: 10;
  top: 0;
  left: 0;
  transition: all 0.4s;
}

.menu {
  position: fixed;
  z-index: 20;
  overflow: hidden;
  transition: all 0.4s;
  color: #008489;
  padding: 45px;
  padding-top: 3rem;
  background: #333;
}

.menu a {
  color: #e4e4e4;
}

.menu h4 {
  margin-top: 10px;
}

.menu .btn {
  margin-top: 1rem;
}

.push-menu-left {
  top: 50px;
  width: 280px;
  height: 100%;
  box-shadow: -4px 1px 5px 0px rgba(0, 0, 0, 0.2);
  -webkit-box-shadow: -4px 1px 5px 0px rgba(0, 0, 0, 0.2);
}

.push-menu-left {
  right: -285px;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">

<div class="container-fluid page-nav">
  <div class="container">
    <div class="row">
      <div class="col-md-9 offset-md-3">
        <nav id="page-nav" class="nav section-links">
          <a class="nav-link active" href="#info">Info</a>
          <a class="nav-link" href="#videos">Videos</a>
          <a class="nav-link" href="#stats">Statistics</a>
        </nav>
      </div>
    </div>
  </div>
</div>
<div class="profile-content">
  <div class="row player-info">
    <div class="container">
      <div class="row">
        <div class="col-md-3">
          <div class="player-avatar-card is-fixed-avatar">
            <div class="card-body">
              <div class="avatar-image">
                <img src="http://via.placeholder.com/350x150" alt="Profile Image" class="rounded-circle">
                <img class="flag rounded-circle" src="http://via.placeholder.com/32x32">
              </div>
              <h5>Name</h5>

              <div class="social-buttons">
                <div class="col-12">
                  <a class="btn btn-info btn-lg" href="#" role="button">
                    <i class="ion-plus-round"></i> follow</a>
                </div>
                <div class="col-12">
                  <a class="btn btn-info btn-outline-info" href="#" role="button">
                    <i class="ion-android-share-alt"></i> share</a>
                </div>
              </div>
            </div>
          </div>
        </div>
        <div class="col-md-9">
          <div id="info" class="player-info-card-content section-card">
            <div class="row">
              <div class="col-12">
                <h5><i class="ion-ios-list-outline title-icon"></i> Overview</h5>
                <hr class="info-title-hr">
              </div>
            </div>
            <div class="row info-content">
              <div class="col-12">
                <div class="row">
                  <div class="col-6 col-md-3 player-info-data">
                    <div class="row">
                      <div class="col-12 info-box">
                        <span class="info-label">Born</span>
                        <p>Born</p>
                      </div>
                    </div>
                  </div>
                  <div class="col-6 col-md-3 player-info-data">
                    <div class="row">
                      <div class="col-12 info-box">
                        <span class="info-label">Club</span>
                        <p>Club</p>
                      </div>
                    </div>
                  </div>
                  <div class="col-6 col-md-3 player-info-data">
                    <div class="row">
                      <div class="col-12 info-box">
                        <span class="info-label">Position</span>
                        <p>Position</p>
                      </div>
                    </div>
                  </div>
                  <div class="col-6 col-md-3 player-info-data">
                    <div class="row">
                      <div class="col-12 info-box">
                        <span class="info-label">Height</span>
                        <p>180 cm</p>
                      </div>
                    </div>
                  </div>
                  <div class="col-6 col-md-3 player-info-data">
                    <div class="row">
                      <div class="col-12 info-box">
                        <span class="info-label">Weight</span>
                        <p>75 kg</p>
                      </div>
                    </div>
                  </div>
                  <div class="col-6 col-md-3 player-info-data">
                    <div class="row">
                      <div class="col-12 info-box">
                        <span class="info-label">Foot</span>
                        <p>Both</p>
                      </div>
                    </div>
                  </div>
                  <div class="col-6 col-md-3 player-info-data">
                    <div class="row">
                      <div class="col-12 info-box">
                        <span class="info-label">Agent</span>
                        <p>Pro sports agency</p>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
          <div class="section-card">
            <div id="videos" class="row">
              <div class="col-md-12">
                <h5 class="title-margin">
                  <i class="ion-ios-videocam-outline title-icon"></i> Videos
                </h5>
              </div>
            </div>
            <div class="row video-section">
              <div class="col-12">
                <div class="info-content">
                  <p></p>
                </div>
              </div>
            </div>
            <div class="col-md-6 col-lg-4 profile-video-box">
              <a href="">
                <div class="card bg-dark text-white">
                  <img src="http://via.placeholder.com/350x150" class="card-img" />
                  <div class="card-img-overlay">
                    <div class="play-icon-wrapper">
                      <i class="ion-ios-play"></i>
                    </div>
                    <div class="card-content">
                      <h5 class="card-title">title
                      </h5>
                      <p class="card-text">date
                      </p>
                    </div>
                  </div>
                </div>
              </a>
            </div>
          </div>

          <div class="section-card">
            <div id="stats" class="row">
              <div class="col-md-12">
                <h5 class="title-margin">
                  <i class="ion-ios-pulse-strong title-icon"></i> Performance data
                </h5>
              </div>
            </div>
            <div class="row">
              <div class="col-md-12">
                <div class="table-responsive">
                  <table class="table">
                    <thead>
                      <tr>
                        <th>
                          <div class="icon-wrapper">
                            <i class="ion-android-calendar"></i>
                          </div>
                          <span class="info-label">Season</span>
                        </th>
                        <th>
                          <div class="icon-wrapper">
                            <i class="flaticon-football-trophy-cup"></i>
                          </div>
                          <span class="info-label">Competition</span>
                        </th>
                        <th>
                          <div class="icon-wrapper">
                            <i class="flaticon-soccer-t-shirt"></i>
                          </div>
                          <span class="info-label">Club</span>
                        </th>
                        <th>
                          <div class="icon-wrapper">
                            <i class="ion-ios-football-outline"></i>
                          </div>
                          <span class="info-label">Goals</span>
                        </th>
                        <th>
                          <div class="icon-wrapper">
                            <i class="flaticon-football-strategic-sketch"></i>
                          </div>
                          <span class="info-label">Assists</span>
                        </th>
                        <th>
                          <div class="icon-wrapper yellow">
                            <i class="flaticon-football-yellow-warning-card"></i>
                          </div>
                          <span class="info-label">Yellow cards</span>
                        </th>
                        <th>
                          <div class="icon-wrapper red">
                            <i class="flaticon-football-card-with-cross-mark"></i>
                          </div>
                          <span class="info-label">Red cards</span>
                        </th>
                      </tr>
                    </thead>
                    <tbody>
                      <tr>
                        <td class="text-center">17/18</td>
                        <td class="text-center">NO</td>
                        <td class="text-center">Odd</td>
                        <td class="text-center">5</td>
                        <td class="text-center">3</td>
                        <td class="text-center">0</td>
                        <td class="text-center">0</td>
                      </tr>
                    </tbody>
                  </table>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>

Answer 2

有三种方法可以达到你想要的效果。

选项1

首先，您可以将要修复的元素和要在其下滚动的元素设置为主元素。然后将它们都设置为position: absolute并将overflow: scroll设置为内容元素。在此示例中，父不会滚动，这就是固定元素不移动的原因。

CSS

.parent {
    position: relative;
    width: 800px;
    height: 400px;
    overflow: hidden; // Just to guarantee that no scroll appears
}
.fixed-menu {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 20px;
    z-index: 2;
}
.content {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    overflow-y: auto;
}

HTML

<div class="parent">
    <div class="fixed-menu"></div>
    <div class="content"></div>
</div>

选项2

同样，您可以创建一个绝对定位的子项，然后创建一个包含固定内容的孙子。如果你没有设置固定孙子的顶部/底部/左/右，它将在孩子坐的任何地方保持固定。

.parent {
    position: relative;
    width: 25%;
    height: 200px;
    overflow: scroll;
    background-color: #f0f0f0;
}

.child {
    position: absolute;
    width: 50px; // Same size as the grandchild for easier positioning
    height: 50px;
    top: 50px;
    right: 50px;
}

.grandchild {
    width: 50px;
    height: 50px;
    position: fixed;
    background-color: red;
}

HTML

<div class="parent">
    Content...          
    <div class="child"><div class="grandchild"></div></div>
</div>

选项3 ......排序

第三，您可以通过设置will-change: transform或transform: translate*(0)为元素的子元素创建一组局部坐标。这会将元素放在自己的渲染层上，从而提供自己的坐标。

CSS

.parent {
    position: relative;
    width: 30%;
    height: 200px;
    overflow: scroll;
    background-color: #f0f0f0;
    transform: translateX(0); // I used X, but any will do.
}

.child {
    position: fixed;
    width: 50px;
    height: 50px;
    top: 25px;
    right: 25px;
    background-color: red;
}

HTML

<div class="parent">
    Content...      
    <div class="child"></div>
</div>

我不确定此选项发生了什么。它之前在所有浏览器中都可用于Internet Explorer，但现在，在所有现代浏览器中，fixed元素的作用就像absolute元素一样，它不固定，它将使用父级的内容滚动。我已经做了实验，发现通过在Chrome开发工具中打开和关闭父级的CSS属性，我可能会导致Chrome出现故障并将子项固定为父级。但这只是一个小问题，它会在刷新后返回渲染第一种方式。因此，我认为这个实施决定是明确有意的。

<强>结论

你有两种方法和潜在的第三种方式来实现你想要的。我仍然在玩第三种方式，因为它不符合我的记忆，实现我想要的故障似乎表明存在可能性，但现在只是实验。