javascript - 如何在图像上方设置指标

Question

如何在图片上方设置元素符号指示器？

.mySlides {display:none}

/* Slideshow container */
.slideshow-container {
  width: 100%;
  position: absolute;
  margin: auto;
  z-index: -1;
}

/* Caption text */
.text {
  color: #f2f2f2;
  font-size: 15px;
  
  position: absolute;
  bottom: 8px;
  width: 100%;
  text-align: center;
}

/* Number text (1/3 etc) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

/* The dots/bullets/indicators */
.dot {
  height: 13px;
  width: 13px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}

.active {
  background-color: #717171;
}

/* Fading animation */
.fade {
  -webkit-animation-name: fade;
  -webkit-animation-duration: 1.5s;
  animation-name: fade;
  animation-duration: 1.5s;
}

@-webkit-keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

@keyframes fade {
  from {opacity: .4} 
  to {opacity: 1}
}

/* On smaller screens, decrease text size */
@media only screen and (max-width: 300px) {
  .text {font-size: 11px}
}

<!--Slide Show Starts-->
<div class="slideshow-container">

<div class="mySlides fade">
  <div class="numbertext">Acharya Tulsi</div>
  <img src="https://www.w3schools.com/css/trolltunga.jpg" style="width:100%">
</div>

<div class="mySlides fade">
  <div class="numbertext">Acharya Mahapragya</div>
  <img src="https://www.planwallpaper.com/static/images/download-happy-janmashtami-hd-images.jpg" style="width:100%">
</div>

<div class="mySlides fade">
  <div class="numbertext">Acharya Mahashraman</div>
  <img src="https://wallpaperbrowse.com/media/images/free_high_resolution_images_for_download-1.jpg" style="width:100%">
</div>
<div class="text" style="text-align:center">
  <span class="dot"></span> 
  <span class="dot"></span> 
  <span class="dot"></span> 
</div>
<!--Slide Show Ends-->
<script>
var slideIndex = 0;
showSlides();

function showSlides() {
    var i;
    var slides = document.getElementsByClassName("mySlides");
    var dots = document.getElementsByClassName("dot");
    for (i = 0; i < slides.length; i++) {
       slides[i].style.display = "none";  
    }
    slideIndex++;
    if (slideIndex> slides.length) {slideIndex = 1}    
    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";
    setTimeout(showSlides, 2000); // Change image every 2 seconds
}
</script>
<div>
  <h2><center>Directory</center></h2>
  <form>
    <div>
      <input type="text" placeholder="Type Sirname to get details" id=""><br><center><input type="submit" Value="Search" id=""></center>
    </div>
  </form>
</div>

我需要以某种方式喜欢图像

此外，如果我清除文本框并提交按钮，我将得到我想要的相同内容。

Answer 1

更清洁的解决方案是使用 bootstrap's carousel .

这是一个工作演示:

    .carousel-caption {
  top: 0;
  bottom: auto;
}

  

    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div id="myCarousel" class="carousel slide" data-ride="carousel">
  <!-- Indicators -->
  <ol class="carousel-indicators">
    <li data-target="#myCarousel" data-slide-to="0" class="active"></li>
    <li data-target="#myCarousel" data-slide-to="1"></li>
    <li data-target="#myCarousel" data-slide-to="2"></li>
  </ol>

  <!-- Wrapper for slides -->
  <div class="carousel-inner">
    <div class="item active">
      <img src="https://www.w3schools.com/css/trolltunga.jpg" alt="Slide 1">
      <div class="carousel-caption">
Acharya Tulsi
      </div>
    </div>

    <div class="item">
      <img src="https://www.planwallpaper.com/static/images/download-happy-janmashtami-hd-images.jpg" alt="Slide 2">
      <div class="carousel-caption">
Acharya Mahapragya
      </div>
    </div>

    <div class="item">
      <img src="https://wallpaperbrowse.com/media/images/free_high_resolution_images_for_download-1.jpg" alt="image three">
    <div class="carousel-caption">
Acharya Mahashraman
    </div>
    </div>
  </div>

  <!-- Left and right controls -->
  <a class="left carousel-control" href="#myCarousel" data-slide="prev">
    <span class="glyphicon glyphicon-chevron-left"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="right carousel-control" href="#myCarousel" data-slide="next">
    <span class="glyphicon glyphicon-chevron-right"></span>
    <span class="sr-only">Next</span>
  </a>
</div>


<div>
  <h2><center>Directory</center></h2>
  <form>
    <div>
      <input type="text" placeholder="Type Sirname to get details" id="">
      <br>
      <center>
        <input type="submit" Value="Search" id="">
      </center>
    </div>
  </form>
</div>