为什么事件处理程序被触发两次？
[英]Why are the event handlers fired twice?
问题描述
如果我折叠或展开“id-1”，则处理程序正常工作。
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”，第二个用于“id-1-1”。
即使没有发生任何操作，为什么会为“id-1”触发事件？
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>
1 个解决方案
解决方案1
1 已采纳 2022-05-19 14:10:13
您需要e.stopPropagation()从您的孩子到顶级父母。
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>
为什么click事件被触发两次？
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.