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Attach or detach an event handler

Written byPhuoc Nguyen
Level 1 — Basic
17 Feb, 2020
Last updated
18 Jun, 2020
You can set the event handler via the `on{eventName}` attribute, where `eventName` represents the name of event. For example:
ele.onclick = function() {

// Remove the event handler
delete ele.onclick;
This approach isn't recommended because we can only attach one handler for each event. Setting the `onclick` attribute, for example, will override any existing handler for the `click` event.

Use the addEventListener method

const handler = function() {

// Attach handler to the `click` event
ele.addEventListener('click', handler);

// Detach the handler from the `click` event
ele.removeEventListener('click', handler);
Note that the event name is passed as the first parameter in both the `addEventListener` and `removeEventListener` methods. It differs from the first approach which requires to prefix the event name with `on`.
If you want the handler to be invoke once, then look at the Create one time event handler post.

See also

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Phước Nguyễn