jQuery如何将onclick事件绑定到动态添加的HTML元素

2022-01-30 00:00:00 bind jquery javascript

我想将 onclick 事件绑定到我使用 jQuery 动态插入的元素

I want to bind an onclick event to an element I insert dynamically with jQuery

但它从不运行绑定的函数.如果您能指出为什么这个示例不起作用以及如何让它正常运行，我会很高兴:

But It never runs the binded function. I'd be happy if you can point out why this example is not working and how I can get it to run properly:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"        
            "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
        <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="da" lang="da">
        <head>
          <title>test of click binding</title>

<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
          <script type="text/javascript">


        jQuery(function(){
          close_link = $('<a class="" href="#">Click here to see an alert</a>');
          close_link.bind("click", function(){
            alert('hello from binded function call');
            //do stuff here...
          });
  
          $('.add_to_this').append(close_link);
        });
          </script>
        </head>
        <body>
          <h1 >Test of click binding</h1>
          <p>problem: to bind a click event to an element I append via JQuery.</p>

          <div class="add_to_this">
            <p>The link is created, then added here below:</p>
          </div>

          <div class="add_to_this">
            <p>Another is added here below:</p>
          </div>


        </body>
        </html>

我编辑了示例以包含插入方法的两个元素.在这种情况下，永远不会执行 alert() 调用.(感谢@Daff 在评论中指出这一点)

I edited the example to contain two elements the method is inserted to. In that case, the alert() call is never executed. (thanks to @Daff for pointing that out in a comment)

推荐答案

第一个问题是，当您在具有多个元素的 jQuery 集合上调用 append 时，会为每个元素创建要附加的元素的克隆，因此附加的事件观察者丢失.

The first problem is that when you call append on a jQuery set with more than one element, a clone of the element to append is created for each and thus the attached event observer is lost.

另一种方法是为每个元素创建链接:

An alternative way to do it would be to create the link for each element:

function handler() { alert('hello'); }
$('.add_to_this').append(function() {
  return $('<a>Click here</a>').click(handler);
})

另一个潜在的问题可能是在元素被添加到 DOM 之前附加了事件观察器.我不确定这是否有什么要说的，但我认为这种行为可能被认为是不确定的.更可靠的方法可能是:

Another potential problem might be that the event observer is attached before the element has been added to the DOM. I'm not sure if this has anything to say, but I think the behavior might be considered undetermined. A more solid approach would probably be:

function handler() { alert('hello'); }
$('.add_to_this').each(function() {
  var link = $('<a>Click here</a>');
  $(this).append(link);
  link.click(handler);
});

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