[英]Selecting the First Appearing Child Within the First Element On a Page with JQuery?
[英]Selecting element of first child
我有一个看起来像这样的函数:
$(".container").on("click", ".comment:first-child > .like_btn", function () {
console.log("it works!");
});
.container
的.comment
会动态添加。 我想做的是检测是否单击了第一个评论的“赞”按钮。 但是,我现在所拥有的不起作用。 我究竟做错了什么?
的HTML
<div class="container">
<div class="comment"> //Dynamically added
<div class="like_btn"></div>
</div>
</div>
编辑:没有错误,只是click事件不会触发。
尝试将处理程序附加到document
:
$(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>
一种解决方案是在document
元素上使用事件委托,如下所示:
$(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>
但是,如果也未动态添加.container
元素,则您的代码应该可以正常工作,如以下示例所示:
$(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>
尝试删除“>”
$('.container .comment .like-btn').on('click', function(){ //do something })
$(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>
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