A jQuery click handler fires two or three times per click. What is the likely cause, and how do you fix it?

Summary

The handler was bound more than once: typically inside a function that runs on every AJAX refresh or page update, or on elements that were re-rendered while old handlers stayed attached to a parent. Each binding adds another handler.

Longer Answer

Fixes: bind once with event delegation on a stable container, outside the refresh function; if a handler must be re-bound, remove it first with a namespace (.off("click.cart").on("click.cart", ...)); use .one() for genuinely single-use handlers. Debug by inspecting the element's listeners in browser DevTools (Event Listeners panel) or $._data(element, "events") in older versions.

Key Points

• Handlers bound repeatedly.
• Delegate once on a stable container.
• Namespaced .off before .on.
• Inspect listeners in DevTools.

Deep dive: Code Clinic: review a jQuery shopping cart script