选择第一个孩子的元素

Question

I have a function that looks like this:

$(".container").on("click", ".comment:first-child > .like_btn", function () {
    console.log("it works!");
});

The .comment in the .container get dynamically added. What I'd like to do is detect if there was a click on the like button of the first comment. However, what I have right now doesn't work. What am I doing wrong?

HTML

<div class="container">
  <div class="comment"> //Dynamically added
     <div class="like_btn"></div>
  </div>
</div>

EDIT: There are no errors, just that the click event doesn't fire.

Answer 1

Try attaching your handler to the document instead:

 $(document).on("click", ".container .comment:first-child > .like_btn", function() { console.log("it works!"); }); setTimeout(() => $(".comment").append("<div class='like_btn'>Like!</div>"), 2000); 

 <script src="https://code.jquery.com/jquery-3.3.1.js"></script> <div class="container"> <div class="comment"> //Dynamically added </div> </div> 

Answer 2

One solution is to use event delegation on the document element, like this:

 $(document).ready(function() { $(".container").append( `<div class="comment"> <div class="like_btn">LIKE 1</div> </div> <div class="comment"> <div class="like_btn">LIKE 2</div> </div>` ); }); $(document).on("click", ".container .comment:first-child > .like_btn", function() { console.log("it works!"); }); 

 .as-console {background-color:black !important; color:lime;} 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div class="container"> </div> 

However, if the .container element is not added, also, dynamically, then your code should work fine as shown on next example:

 $(document).ready(function() { $(".container").append( `<div class="comment"> <div class="like_btn">LIKE 1</div> </div> <div class="comment"> <div class="like_btn">LIKE 2</div> </div>` ); }); $(".container").on("click", ".comment:first-child > .like_btn", function() { console.log("it works!"); }); 

 .as-console {background-color:black !important; color:lime;} 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div class="container"> </div> 

Answer 3

尝试删除“>”

$('.container .comment .like-btn').on('click', function(){ //do something })

Answer 4

 $(document).ready(function() { $(".container").append( `<div class="comment"> <div class="like_btn">LIKE 1</div> </div> <div class="comment"> <div class="like_btn">LIKE 2</div> </div>` ); }); $(document).on("click", ".container div:first-of-type > .like_btn", function() { console.log("it works!"); }); 

 .as-console {background-color:black !important; color:lime;} 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div class="container"> </div>