与静态祖先的事件绑定导致每个点击事件被触发

Question

我创建了一个小型测试应用程序，应该允许用户创建：

创建列表元素
删除列表元素
创建列表
删除列表

我了解到动态添加的元素不会绑定到它们的事件（基于此：Event binding on dynamically created elements?）所以我尝试将事件附加到单个静态祖先。不幸的是，这会导致仅在按下一个按钮时触发每个单击事件。

<head>
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
    <title>Test Page</title>
</head>
<body>
    <div id="container">
        <div class="listContainer">
            <ol>
                <li>First list <button class="btnDeleteListItem">Delete</button></li>
                <li>First list <button class="btnDeleteListItem">Delete</button></li>
                <li>First list <button class="btnDeleteListItem">Delete</button></li>
            </ol>
            <button class="btnAddListElement">+Add List Item</button>
            <button class="btnDeleteList">Delete List</button>
        </div>
        <button class="btnAddList">+Add List</button>
    </div>
</body>
<script>
var btnDeleteListItem = $(".btnDeleteListItem");
var btnAddListElement = $(".btnAddListElement");
var btnDeleteList = $(".btnDeleteList");
var btnAddList = $(".btnAddList");
var container = $("#container");

container.on("click",btnDeleteListItem, function (e) {
    $(this).parent().remove();
    console.log("list item deleted");
});

container.on("click",btnAddListElement, function (e) {
    var html = '<li> Just added <button class="btnDeleteListItem">Delete</button></li>';
    $("ol").append(html);
    console.log("list item added");
});

container.on("click",btnDeleteList, function (e) {
    $(this).parent().remove();
    console.log("list deleted");
});

btnAddList.on("click", function(e){
    var html = '<div class="listContainer"><ol><li>Other list <button class="btnDeleteListItem">Delete</button></li><li>Other list <button class="btnDeleteListItem">Delete</button></li><li>Other list <button class="btnDeleteListItem">Delete</button></li></ol><button class="btnAddListElement">+Add List Item</button><button class="btnDeleteList">Delete List</button></div>';
    $(html).insertBefore($(this));
    console.log("list added");
});
</script>

</html>`

有没有办法隔离点击事件？

Answer 1

问题是因为，虽然您使用的是委托事件处理程序，但您只是在 DOM 加载时选择元素。要解决此问题，请将选择器参数作为字符串传递给 on()。这样，选择器将在 click 事件通过 #container 时匹配，而不仅仅是针对特定元素实例。

另请注意，您需要在与 .btnAddListElement 按钮相关的 ol 上仅调用单击，否则您最终会向每个列表添加一个新的 li。为此，请将 $('ol') 更改为 $(this).prev('ol')。

var $container = $("#container");

$container.on("click", ".btnDeleteListItem", function(e) {
  $(this).parent().remove();
  console.log("list item deleted");
});

$container.on("click", '.btnAddListElement', function(e) {
  var html = '<li> Just added <button class="btnDeleteListItem">Delete</button></li>';
  $(this).prev("ol").append(html);
  console.log("list item added");
});

$container.on("click", '.btnDeleteList', function(e) {
  $(this).parent().remove();
  console.log("list deleted");
});

$container.on('click', '.btnAddList', function(e) {
  var html = '<div class="listContainer"><ol><li>Other list <button class="btnDeleteListItem">Delete</button></li><li>Other list <button class="btnDeleteListItem">Delete</button></li><li>Other list <button class="btnDeleteListItem">Delete</button></li></ol><button class="btnAddListElement">+Add List Item</button><button class="btnDeleteList">Delete List</button></div>';
  $(html).insertBefore($(this));
  console.log("list added");
});

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>

<div id="container">
  <div class="listContainer">
    <ol>
      <li>First list <button class="btnDeleteListItem">Delete</button></li>
      <li>First list <button class="btnDeleteListItem">Delete</button></li>
      <li>First list <button class="btnDeleteListItem">Delete</button></li>
    </ol>
    <button class="btnAddListElement">+Add List Item</button>
    <button class="btnDeleteList">Delete List</button>
  </div>
  <button class="btnAddList">+Add List</button>
</div>

与静态祖先的事件绑定导致每个点击事件被触发

Event binding with Static Ancestors leads to every click event being triggered

javascript

jquery

uielement