如何将Ajax加载器添加到幻灯片放映

Question

我有一个简单的手动幻灯片。我想在加载测试1，测试2，测试3文本之前一直单击预览或下一步按钮时添加ajax加载器图像。 任何帮助都可以做到这一点

var slideIndex = 1;
showDivs(slideIndex);

function plusDivs(n) {
  showDivs(slideIndex += n);
}

function showDivs(n) {
  var i;
  var x = document.getElementsByClassName("mySlides");
  if (n > x.length) {slideIndex = 1}    
  if (n < 1) {slideIndex = x.length}
  for (i = 0; i < x.length; i++) {
     x[i].style.display = "none";  
  }
  x[slideIndex-1].style.display = "block";  
}

<div class="slider">
 <button class="" onclick="plusDivs(-1)">&#10094;</button>
 <button class="" onclick="plusDivs(1)">&#10095;</button>
 
 <div class="mySlides">Test 1</div>
 <div class="mySlides">Test 2</div>
 <div class="mySlides">Test 3</div>
</div>

Answer 1

我用css创建了加载图片！但通常加载图像用于ajax调用以获得长响应！因为javascript是客户端语言所以它执行得非常快，因此我使用setTimeout进行测试以加载remove！

＆＃13;

＆＃13;

var slideIndex = 1;
showDivs(slideIndex);

function plusDivs(n) {
  $(".loader").show();
   setTimeout(function(){
     showDivs(slideIndex += n);
   },1000);
}

function showDivs(n) {
  var i;
  var x = document.getElementsByClassName("mySlides");
  if (n > x.length) {slideIndex = 1}    
  if (n < 1) {slideIndex = x.length}
  for (i = 0; i < x.length; i++) {
     x[i].style.display = "none";  
  }
  $(".loader").hide();
  x[slideIndex-1].style.display = "block";  
}

＆＃13;

.loader {
    border: 16px solid #f3f3f3; /* Light grey */
    border-top: 16px solid #3498db; /* Blue */
    border-radius: 50%;
    width: 120px;
    display:none;
    height: 120px;
    animation: spin 2s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="slider">
 <button class="" onclick="plusDivs(-1)">&#10094;</button>
 <button class="" onclick="plusDivs(1)">&#10095;</button>
 
 <div class="mySlides">Test 1</div>
 <div class="mySlides">Test 2</div>
 <div class="mySlides">Test 3</div>
</div>
<div class='loader'></div>

＆＃13;

＆＃13;

＆＃13;