Question

所以我在图像上有一个按钮，我想改变用户将鼠标悬停在图像上时的颜色。

按钮本身的css

.prev{
    cursor: pointer;
    position: absolute;
    top: 50%;
    width: auto;
    padding: 16px;
    margin-top: -50px;
    color: white;
    font-weight: bold;
    font-size: 20px;
    transition: 0.6s ease;
    border-radius: 0 3px 3px 0;
    user-select: none;
    -webkit-user-select: none;

这是html

   <body>

<h2 style="text-align:center">Lightbox</h2>

<div class="row">
  <div class="column">
    <img src="img_nature.jpg" style="width:100%" onclick="openModal();currentSlide(1)" class="hover-shadow cursor">
  </div>
  <div class="column">
    <img src="img_fjords.jpg" style="width:100%" onclick="openModal();currentSlide(2)" class="hover-shadow cursor">
  </div>
  <div class="column">
    <img src="img_mountains.jpg" style="width:100%" onclick="openModal();currentSlide(3)" class="hover-shadow cursor">
  </div>
  <div class="column">
    <img src="img_lights.jpg" style="width:100%" onclick="openModal();currentSlide(4)" class="hover-shadow cursor">
  </div>
</div>

<div id="myModal" class="modal">
  <span class="close cursor" onclick="closeModal()">&times;</span>
  <div class="modal-content">

    <div class="mySlides">
      <div class="numbertext">1 / 4</div>
      <img src="img_nature_wide.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">2 / 4</div>
      <img src="img_fjords_wide.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">3 / 4</div>
      <img src="img_mountains_wide.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">4 / 4</div>
      <img src="img_lights_wide.jpg" style="width:100%">
    </div>

    <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
    <a class="next" onclick="plusSlides(1)">&#10095;</a>

    <div class="caption-container">
      <p id="caption"></p>
    </div>


    <div class="column">
      <img class="demo cursor" src="img_nature_wide.jpg" style="width:100%" onclick="currentSlide(1)" alt="Nature and sunrise">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_fjords_wide.jpg" style="width:100%" onclick="currentSlide(2)" alt="Trolltunga, Norway">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_mountains_wide.jpg" style="width:100%" onclick="currentSlide(3)" alt="Mountains and fjords">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_lights_wide.jpg" style="width:100%" onclick="currentSlide(4)" alt="Northern Lights">
    </div>
  </div>
</div>

这是我正在尝试使用的CSS。 div.mySlides是包含我的图像的div。

.prev {
    color:white;
}

div.mySlides:hover + .prev, .prev:hover {
    color:red;
}

我正在使用的javascript

<script>
function openModal() {
  document.getElementById('myModal').style.display = "block";
}

function closeModal() {
  document.getElementById('myModal').style.display = "none";
}

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("demo");
  var captionText = document.getElementById("caption");
  if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";
  dots[slideIndex-1].className += " active";
  captionText.innerHTML = dots[slideIndex-1].alt;
}
</script>

此时，只有当用户将鼠标悬停在按钮位置时，颜色才会发生变化。我试过改变css中的顺序只是为了找不到任何效果。

Answer 1

所以你已经基本上工作了，只是为了最后一个.mySlides元素，因为你只选择了紧随其后的.prev兄弟（使用相邻兄弟组合 +），而不是所有具有该类的兄弟姐妹，无论他们来自徘徊的div之后有多远“ - ~，一般兄弟组合。

以下基本考试表明它原则上有效（无需添加实际图像或其他样式。）

.prev {
    color:blue;
}

div.mySlides { 
    margin:.5em 0;
    padding: .5em;
    border: 1px solid;
    cursor: pointer;
}

div.mySlides:hover ~ .prev, .prev:hover {
    color:red;
}

<div id="myModal" class="modal">
  <div class="modal-content">

    <div class="mySlides">
      <div class="numbertext">1 / 4</div>
    </div>

    <div class="mySlides">
      <div class="numbertext">2 / 4</div>
    </div>

    <div class="mySlides">
      <div class="numbertext">3 / 4</div>
    </div>

    <div class="mySlides">
      <div class="numbertext">4 / 4</div>
    </div>

    <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
    <a class="next" onclick="plusSlides(1)">&#10095;</a>
  </div>

Answer 2

尝试以下代码

#a:hover ~ #b {
    color: #ccc
}

<div id="a">Div A</div>
<div>elements</div>
<div>elements</div>
<div>elements</div>
<div id="b">Div B</div>

Answer 3

button{
  padding:30px;
  color:white;
  background-color: red;
}

img:hover + button{
  background-color: black;
}

<img src="https://www.google.ca/logos/doodles/2018/har-gobind-khoranas-96th-birthday-4731112378073088-s.png" width="200" />
<button>my button</button>

Answer 4

更改此

div.mySlides:hover + .prev, .prev:hover {
    color:red;
}

到这个

div.mySlides:hover ~ .prev, .prev:hover {
    color:red;
}

参见https://developer.mozilla.org/en-US/docs/Web/CSS/Adjacent_sibling_selectors vs。https://developer.mozilla.org/en-US/docs/Web/CSS/General_sibling_selectors了解更多信息。

仅在图像悬停

4 个答案: