Question

我正在尝试编辑Bootstrap，我想添加比现有内容更多但无法使用的内容。

我尝试添加幻灯片，但它是完全白色的，只有用于更改图像的箭头是蓝色的。

我知道它的一部分正在运行，因为当我单击以更改图像时，页面的尺寸会发生变化（我只有1张照片，其他2个链接用于不存在的照片）。

我复制了W3Schools代码并将其粘贴到引导程序页面中，引导程序文件中是否有内容，将所有内容都变成了白色？

这是我的代码：

df1 = (df.groupby(['Country', 'Quarter', 'Division', 'Type'])['Value']
         .agg([('Type','count'), ('Value','sum')])
         .unstack(fill_value=0))
df1.columns = df1.columns.map('_'.join)
df1 = df1.reset_index()
print (df1)
  Country  Quarter   Division  Type_A  Type_B  Value_A  Value_B
0       A        1      Sales       2       0      300        0
1       A        2  Marketing       1       0       50        0
2       A        2      Sales       1       1      150       50
3       A        3      Sales       0       2        0       70

var slideIndex = 1;
showSlides(slideIndex);
// Next/previous controls
function plusSlides(n) {
  showSlides(slideIndex += n);
}
// Thumbnail image controls
function currentSlide(n) {
  showSlides(slideIndex = n);
}
function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("dot");
  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";
}

* {
  box-sizing: border-box
}
/* Slideshow container */
.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}
/* Hide the images by default */
.mySlides {
  display: none;
  z-index: 3;
}
/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}
/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: rgba(0, 0, 0, 0.8);
}
/* Caption text */
.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  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 {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}
.active, .dot:hover {
  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
  }
}
}

Answer 1

根据您的问题，当您在代码中添加引导程序时，由于class="fade"与bootstrap fade class重叠，因此您的代码受var slideIndex = 1; showSlides(slideIndex); // Next/previous controls function plusSlides(n) { showSlides(slideIndex += n); } // Thumbnail image controls function currentSlide(n) { showSlides(slideIndex = n); } function showSlides(n) { var i; var slides = document.getElementsByClassName("mySlides"); var dots = document.getElementsByClassName("dot"); 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"; }的影响时，图像以白色显示。使用其他类名

* {
  box-sizing: border-box
}
/* Slideshow container */
.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}
/* Hide the images by default */
.mySlides {
  display: none;
  z-index: 3;
}
/* Next & previous buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}
/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}
/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
  background-color: rgba(0, 0, 0, 0.8);
}
/* Caption text */
.text {
  color: #f2f2f2;
  font-size: 15px;
  padding: 8px 12px;
  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 {
  cursor: pointer;
  height: 15px;
  width: 15px;
  margin: 0 2px;
  background-color: #bbb;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.6s ease;
}
.active, .dot:hover {
  background-color: #717171;
}
/* Fading animation */
.fade-in {
  -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
  }
}
}

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta content="width=device-width, initial-scale=1" name="viewport">
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css" rel="stylesheet">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js">
  </script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js">
  </script>
</head>
<body>
  <div class="slideshow-container">
    <!-- Full-width images with number and caption text -->
    <div class="mySlides fade-in">
      <div class="numbertext">
        1 / 3
      </div><img src="https://www.w3schools.com/bootstrap/ny.jpg" style="width:100%">
      <div class="text">
        Caption Text
      </div>
    </div>
    <div class="mySlides fade-in">
      <div class="numbertext">
        2 / 3
      </div><img src="https://www.w3schools.com/bootstrap/chicago.jpg" style="width:100%">
      <div class="text">
        Caption Two
      </div>
    </div>
    <div class="mySlides fade-in">
      <div class="numbertext">
        3 / 3
      </div><img src="https://www.w3schools.com/bootstrap/la.jpg" style="width:100%">
      <div class="text">
        Caption Three
      </div>
    </div><!-- Next and previous buttons -->
    <a class="prev" onclick="plusSlides(-1)">&#10094;</a> <a class="next" onclick="plusSlides(1)">&#10095;</a>
  </div><br>
  <!-- The dots/circles -->
  <div style="text-align:center">
    <span class="dot" onclick="currentSlide(1)"></span> <span class="dot" onclick="currentSlide(2)"></span> <span class="dot" onclick="currentSlide(3)"></span>
  </div>
</body>
</html>

foreach() {}

Answer 2

最合乎逻辑的原因似乎是轮播/幻灯片中显示的图像路径不正确。

加载页面后，打开开发人员工具，然后在html中搜索Photo/Test1.png，src标记中将包含一个路径。

验证路径正确。在新标签页中打开链接，以验证实际的图像是否已从URL加载，并对您正在使用的其他图像执行相同的操作。

您还可以尝试使用绝对路径作为图像src属性，例如：

https://www.w3schools.com/howto/img_snow_wide.jpg
https://www.w3schools.com/howto/img_mountains_wide.jpg
https://www.w3schools.com/howto/img_nature_wide.jpg

如果加载的图像肯定不是您所使用的路径的问题，那么这就是问题。

无法在Bootstrap中实现W3Schools幻灯片演示？

2 个答案: