How to deal with jQuery failing to trigger binding events when adding elements-JS Tutorial-php.cn

How to deal with jQuery failing to trigger binding events when adding elements

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Release： 2018-03-15 11:38:39

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This time I will bring you jQuery's failure to trigger binding when adding elements EventsHow to deal with jQuery's failure to trigger binding events when adding elementsWhat are the precautions , the following is a practical case, let’s take a look.

I recently encountered a problem, that is, after using jquery to dynamically add elements, I found that the dynamically added elements could not trigger events. Later, I checked some information on the Internet and found that it was supposed to be handled like this:

First, let’s talk about my error code:

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <link rel="stylesheet" href="http://cdn.bootcss.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="external nofollow" >
  <script src="//cdn.bootcss.com/jquery/1.8.3/jquery.min.js"></script>
  <script>
    $(document).ready(function(){
//这里是动态添加元素
      $(".add").click(function(){
        var btn = $("<button class=&#39;newBtn btn btn-default&#39;>新按钮</button>");
        $("body").append(btn);
      })<br><br>//这里是为添加的元素添加事件
      $(".newBtn").click(function(){
        alert("这里是新添加的元素触发的事件");
      })
    })
  </script>
</head>
<body>
<button class=" add btn btn-default">添加按钮</button>
</body>
</html>

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Here’s my solution

Method 1: Bind live events (live events are only supported below jquery 1.9, not higher versions).

$(".newBtn").live("click",function(){
///jquery 1.9(不包括1.9)以下可以
  alert('这里是动态元素添加的事件');
})

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Method 2: Use on() event binding($(ParentEle).on("click",".thisEle",function(){ })

$("body").on("click", ".newBtn", function() {
   alert('这里是动态元素添加的事件');
});
//这里的ParentEle是 thisEle的父辈元素或者祖先元素，ParentEle可以是document，也可以是body等。
//注意：如果此时调用的函数是外部定义好的函数，那在调用的时候不要加()，不然会跳过点击事件直接触发函数

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$("body").on("click", ".newBtn",aa );
function aa(){
    alert('这里是动态元素添加的事件');
}

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ok, the problem is solved, continue to climb the pit

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!