html - 如何让应用程序出现在悬停在图像顶部时？

Question

我知道重叠的问题已被多次回答，但是，我试图将文本放在图像的顶部，一旦悬停就居中。我尝试了 z-index，尝试了相对和绝对，决定寻求帮助。

.flex-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    margin: 0;
    padding-left: 7%;
    padding-right: 7%;
    padding-top: 25px;
    padding-bottom: 50px;
    justify-content: center;

}
.flex-container div {
    margin: 0;
    position: relative;
    margin-bottom: -5px;
    font-size: medium;
    text-align: center;
    z-index: 0;
}

.flex-container div:hover {
    filter: brightness(50%);
}

.flex-container div p {
    display: none;
}

.flex-container div:hover p {
    position: absolute;
    color: black;
    z-index: 1;
    text-align: center;
}

<div>
    <a href="Printing/menus.html">
        <img src="../Images/menus-01.png" alt="Printing" style="width:100%; height:auto;"/>
    </a>
    <p>Menus</p>
</div>

Answer 1

您应该先设置文本 CSS，然后让悬停显示样式，另外，您忘记在代码中设置容器样式。

看看这是不是你想要的:

HTML:

<div class="container">
  <img src="../Images/menus-01.png" alt="Image" style="width:100%;">
  <div class="topTxt">Text on Center/div>
</div>

CSS:

.container {
  position: relative;
  text-align: center;
}

.topTxt {
  position: absolute;
  display: none;
  top: 0;
  left: 50%;
  transform: translate(-50%, 0%);
}

.container:hover .topTxt {
  display: block;
}

或使用 JavaScript :

document.getElementsByClass("container").addEventListener("mouseover", function() {
  document.getElementsByClass("topTxt").style.display = "block";
});

获取以下代码片段以更好地了解您的请求:

#container {
  max-width: 900px;
  margin: 0 auto;
  padding: 5px;
  font-size: 0;
  list-style: none;
  background-color: #444;
}

#container li {
  display: inline-block;
  width: 25%;
  vertical-align: middle;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.container-cells {
  margin: 5px;
  box-shadow: 0 0 6px rgba(0, 0, 0, 0.3);
  display: block;
  position: relative;
  overflow: hidden;
}

.imgs {
  display: block;
  width: 100%;
  height: auto;
  border: none;
  filter: brightness(100%);
  transition: all 0.3s;
}

#container li:hover .imgs {
  filter: brightness(50%);
}

.overlay {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  width: 100%;
  height: 0px;
  margin: auto;
  background: #000;
  background-size: 50px 50px;
  transition: all 0.3s;
}

#container li:hover .overlay {
  height: 30px;
}

.title {
  display: block;
  padding: 5px 30px;
  box-sizing: border-box;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 40px;
  text-align: center;
  font-size: 18px;
  color: white;
  opacity: 0;
  transform: translateY(-20px);
  transition: all .3s;
}

#container li:hover .title {
  transform: translateY(0px);
  opacity: 0.9;
}

@media (max-width: 9000px) {
  #container li {
    width: 25%;
  }
}

@media (max-width: 700px) {
  #container li {
    width: 33.33%;
  }
}

@media (max-width: 550px) {
  #container li {
    width: 50%;
  }
}

<ul id="container">
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
  <li>
    <a class="container-cells" href="#">
      <img class="imgs" src="https://www.madpaws.com.au/wp-content/uploads/2019/02/Raise-Your-Kitten-to-Use-the-Litter-Box-300x200.jpg">
      <span class="overlay"></span>
      <span class="title">Hello World !</span>
    </a>
  </li>
</ul>

你只需要将文字放在图片之前，因为无论哪种方式图片都是背景，只需在前面添加文字，那么图片和文字将是 sibling ，而不是 parent 和 child ，所以效果悬停不会影响 child ，因此，文本颜色将保持不变，而不会对其应用过滤器。