javascript - 如何使幻灯片仅在第一次单击时向左移动并在第一次单击时拒绝向左移动？

Question

单击左按钮时，我的幻灯片区域向右滚动，但是那里什么也没有，所以有没有办法锁定第一次单击，以便它只能在先向右滚动时向左滚动？还有一种方法可以在到达最后一个 div 后锁定滚动条吗？

var $slider = $("#recent-container")

$("#right-button").click(function() {
  $slider.css("left", "-=932px")
});

$("#left-button").click(function() {
  $slider.css("left", "+=932px")
});

/*----------Recent Projects----------*/

#recent-title {
  font-size: 30px;
  font-family: 'calibri light';
  border-bottom: #d8d8d8 solid 1px;
  margin: 0px;
  padding: 10px;
  box-shadow: 0 10px 10px -5px rgba(0, 0, 0, 0.3);
}

.thmbnl-name {
  font-size: 20px;
  font-family: 'calibri light';
  text-align: center;
}

#recent {
  text-align: center;
  border: #d8d8d8 solid 1px;
  overflow: hidden;
  position: relative;
  width: 950px;
  height: 330px;
  background-color: white;
  z-index: 1;
  margin-bottom: 25px;
}

#recent #recent-container {
  position: absolute;
  white-space: nowrap;
  left: 0;
  -webkit-transition: all 2s ease-in-out;
  transition: all 1s ease-in-out;
  z-index: -1;
  padding: 10px;
}

#recent #recent-container .thmbnl-recent {
  display: inline-block;
}

.thmbnl-recent {
  padding: 19.5px;
}

.thmbnl-recent:hover {
  background-color: #eaeaea;
  transition: background-color ease 1s;
}

#right-button {
  font-family: 'calibri';
  font-weight: bold;
  border-style: none;
  width: 60px;
  height: 60px;
  font-size: 35px;
  background-color: rgba(0, 0, 0, 0.6);
  position: absolute;
  right: 0px;
  top: 37.5%;
  cursor: pointer;
  color: #e5e5e5;
  border-radius: 100%;
  text-align: center;
  line-height: 55px;
}

#left-button {
  font-family: 'calibri';
  font-weight: bold;
  border-style: none;
  width: 60px;
  height: 60px;
  font-size: 35px;
  background-color: rgba(0, 0, 0, 0.6);
  position: absolute;
  left: 0px;
  top: 37.5%;
  cursor: pointer;
  color: #e5e5e5;
  border-radius: 100%;
  text-align: center;
  line-height: 55px;
}

<div id="recent">
  <h2 id="recent-title">Recent Projects</h2>
  <div id="recent-container">
    <div class="thmbnl-recent">
      <img src="http://placehold.it/190x190">
      <h1 class="thmbnl-name">Sample</h1>
    </div>
    <div class="thmbnl-recent">
      <img src="http://placehold.it/190x190">
      <h1 class="thmbnl-name">Sample</h1>
    </div>
    <div class="thmbnl-recent">
      <img src="http://placehold.it/190x190">
      <h1 class="thmbnl-name">Sample</h1>
    </div>
    <div class="thmbnl-recent">
      <img src="http://placehold.it/190x190">
      <h1 class="thmbnl-name">Sample</h1>
    </div>
    <div class="thmbnl-recent">
      <img src="http://placehold.it/190x190">
      <h1 class="thmbnl-name">Sample</h1>
    </div>
    <div class="thmbnl-recent">
      <img src="http://placehold.it/190x190">
      <h1 class="thmbnl-name">Sample</h1>
    </div>
    <div class="thmbnl-recent">
      <img src="http://placehold.it/190x190">
      <h1 class="thmbnl-name">Sample</h1>
    </div>
    <div class="thmbnl-recent">
      <img src="http://placehold.it/190x190">
      <h1 class="thmbnl-name">Sample</h1>
    </div>

  </div>

  <p id="right-button">></p>
  <p id="left-button">
    <</p>

</div>

Answer 1

如果 recent-container 不在末尾，您可以尝试更改按钮功能以仅更改 CSS。例如，对于右键:

  var $slider = $("#recent-container");
  $("#right-button").click(function() {
    if ($slider.position().left + $slider.width() > 0) $slider.css("left", "-=932px");
  });

  $("#left-button").click(function() {
    if ($slider.position().left < 0) $slider.css("left", "+=932px");
  });