Question

使用jQuery，我如何浏览每个嵌套的ul.item，计算LI的数量，并在该页面上的父span.someClass中返回该大小/长度？

<ul>
  <li><span class="someClass">3</span>
    <ul class="item" style="display:none">
      <li>count me</li>
      <li>count me</li>
      <li>count me</li>
    </ul>
  </li>
  <li><span class="someClass">1</span>
    <ul class="item" style="display:none">
      <li>count me</li>
    </ul>
  </li>
  <li><span class="someClass">2</span>
    <ul class="item" style="display:none">
      <li>count me</li>
      <li>count me</li>
    </ul>
  </li>
</ul>

Answer 1

$("ul.item").each(function() {
    // reusabilty
    var context = $(this);
    // count and populate
    context.prev(".someClass").text(context.children().length);
});

如果这些.someClass元素始终> <{strong>> prev()个元素之前，

span会在ul调用中忽略prev。在这种情况下，{{1}}中的过滤不是必要的，也是多余的。

Answer 2

试试这个，

<强> Live Demo

 $('.someClass').each(function(){    
     $(this).text($(this).next('ul').find('li').length);
 })

Answer 3

您可以使用text方法：

$('.someClass').text(function(){
   return $(this).next().find('li').length
})

http://jsfiddle.net/EEsRR/

Answer 4

<html>
<head>
    <script type="text/javascript" src="jquery.js"></script>
    <script type="text/javascript">
         $(function() { 
            var count = 0;
            $('ul').each(function(){
                if(count != 0){

                    var len = $(this).find('li').length;

                    $(this).parent().find('.someClass').html(len);
                }
                count++;

            })  
         });

    </script>
</head>
<body>
<ul>
  <li><span class="someClass"></span>
    <ul class="item" style="display:none">
      <li>count me</li>
      <li>count me</li>
      <li>count me</li>
    </ul>
  </li>
  <li><span class="someClass"></span>
    <ul class="item" style="display:none">
      <li>count me</li>
    </ul>
  </li>
  <li><span class="someClass"></span>
    <ul class="item" style="display:none">
      <li>count me</li>
      <li>count me</li>
    </ul>
  </li>
</ul>
</body>
</html>

Answer 5

$("ul.item").each(function() {
    var _c = $(this);
    _c.siblings("span.someClass").html(_c.children("li").length);
});

Answer 6

使用jQuery遍历每个<li>：

$(document).ready(function(){

  var howMany;
  // loop through every span.someClass
  $('.someClass').each(function(){
    // loop through every <li> within that span.someClass
    $('li').each(function(){
      // .index() is the current index of the $(this) object, it starts at 0, therefore .index()+1
      howMany = $(this).index()+1;
    });
    // Write your counted <li> in your <span> with .text(), manipulate the text within the <span> tags
    $(this).text(howMany);
  });
});

有效吗？

Answer 7

$('#yourelementid > li').length;

这对你有用，而不是使用任何循环

jquery - 在多个ul和返回值中计算li

7 个答案: