问为什么事件处理程序会被两次激发？
EN

Stack Overflow用户

提问于 2022-05-19 14:02:58

回答 1查看 40关注 0票数 0

如果我折叠或展开"id-1“，则处理程序将正确工作。

如果我折叠或展开"id-1-1“，则会触发两个处理程序:一个用于"id-1”，另一个用于"id-1-1“。

为什么在没有发生任何动作的情况下，"id-1“事件会被触发？

const myCollapsible = document.querySelectorAll('.collapse');
myCollapsible.forEach(myOne => {
    myOne.addEventListener('shown.bs.collapse', function() {
        console.log('shown ' + this.id);
    });
    myOne.addEventListener('hidden.bs.collapse', function() {
        console.log('hidden ' + this.id);
    });
});

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.8.2/font/bootstrap-icons.css">
  </head>
  <body>
    <div>
        <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1"></a>
        <a href="#">id-1</a>
        <div class="collapse ms-4" id="id-1">
            <div>
                <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-1"></a>
                <a href="#">id-1-1</a>
                <div class="collapse ms-4" id="id-1-1">
                    text
                </div>
            </div>
            <div>
                <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-2"></a>
                <a href="#">id-1-2</a>
                <div class="collapse ms-4" id="id-1-2">
                    text
                </div>
            </div>
            <div>
                <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-3"></a>
                <a href="#">id-1-3</a>
                <div class="collapse ms-4" id="id-1-3">
                    text
                </div>
            </div>
        </div>
    </div>
    <div>
        <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-2"></a>
        <a href="#">id-2</a>
        <div class="collapse ms-4" id="id-2">
            text
        </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/js/bootstrap.bundle.min.js"></script>
  </body>
</html>

javascript

回答 1

Stack Overflow用户

回答已采纳

发布于 2022-05-19 14:10:13

您需要从您的孩子到顶级父母的e.stopPropagation()。

您可以在stopPropagation上找到更多信息。

const myCollapsible = document.querySelectorAll('.collapse');
myCollapsible.forEach(myOne => {
  myOne.addEventListener('shown.bs.collapse', function(e) {
    e.stopPropagation();
    console.log('shown ' + this.id);

  });
  myOne.addEventListener('hidden.bs.collapse', function(e) {
    e.stopPropagation();
    console.log('hidden ' + this.id);

  });
});

<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/css/bootstrap.min.css" rel="stylesheet">
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.8.2/font/bootstrap-icons.css">
</head>

<body>
  <div>
    <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1"></a>
    <a href="#">id-1</a>
    <div class="collapse ms-4" id="id-1">
      <div>
        <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-1"></a>
        <a href="#">id-1-1</a>
        <div class="collapse ms-4" id="id-1-1">
          text
        </div>
      </div>
      <div>
        <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-2"></a>
        <a href="#">id-1-2</a>
        <div class="collapse ms-4" id="id-1-2">
          text
        </div>
      </div>
      <div>
        <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-1-3"></a>
        <a href="#">id-1-3</a>
        <div class="collapse ms-4" id="id-1-3">
          text
        </div>
      </div>
    </div>
  </div>
  <div>
    <a class="bi-caret-right-fill link-dark text-decoration-none me-2" data-bs-toggle="collapse" href="#id-2"></a>
    <a href="#">id-2</a>
    <div class="collapse ms-4" id="id-2">
      text
    </div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.0-beta1/dist/js/bootstrap.bundle.min.js"></script>
</body>

</html>

票数 2

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/72305997

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