Debugging legacy jQuery code for inconsistent event handling during refactor
I'm reviewing some code and I'm stuck trying to Quick question that's been bugging me - While refactoring a legacy application utilizing jQuery 3.6.0, I've noticed that some event handlers, particularly those tied to dynamically generated elements, fail to trigger correctly. The original implementation used inline event handlers extensively, which I’m migrating to a more maintainable approach using delegated events. Here’s a snippet of the original code that sets up event handling for a set of buttons: ```javascript $('.my-button').on('click', function() { alert('Button clicked!'); }); ``` However, when new buttons are added after the page load, they do not respond to the click events as expected. To address this, I've switched to event delegation: ```javascript $(document).on('click', '.my-button', function() { alert('Button clicked!'); }); ``` Despite this change, the click event sometimes still doesn't register for newly added buttons, and I can't pinpoint the issue. In my debugging sessions, I’ve confirmed that the buttons are being added to the DOM as intended and that the event handler remains intact. Here's the logic I employed for adding new buttons: ```javascript function addButton() { $('<button class="my-button">New Button</button>').appendTo('#button-container'); } ``` Yet, the alerts refuse to trigger intermittently, which leads me to believe there might be a race condition or an issue with how jQuery handles events in these scenarios. I’ve attempted to wrap the `addButton` function call in a timeout, expecting that it could be a timing issue: ```javascript setTimeout(addButton, 1000); ``` This didn’t yield any improvement. I also explored using `.on()` with `.one()` to ensure the handler only binds once per element, although that seems unnecessary given the context. In addition to the event handling, I started logging the jQuery object to the console before adding buttons to make sure everything is functioning as expected. The output appears correct, but the inconsistency remains frustrating. What strategies can I adopt to ensure that my delegated event handlers work reliably on dynamically inserted elements? Any insights into debugging or restructuring this code would be greatly appreciated. I'm working on a web app that needs to handle this. Any ideas what could be causing this? I'm open to any suggestions. I'm on Debian using the latest version of Javascript. I'd be grateful for any help.