Quick Reference
The Element removeEventListener() method removes an event handler to an element.
<!-- button to remove event handler -->
<button onclick="remove_handler()">Remove Event</button>
<!-- element with event -->
<p id="output">Hover for Alert</p>When the user clicks the button, the event will be removed from the paragraph element.
// variable
let my_element = document.getElementById('output');
// original event
my_element.addEventListener('mouseover', my_function);
// function called by event
function my_function() {
alert('You have clicked the mouse.');
}
// remove the event
function remove_handler() {
my_element.removeEventListener("mouseover", my_function);
}Output
(no output, but the event has been removed)Syntax
element.removeEventListener(event, function, useCapture)Parameters
| Parameter | Return Types |
|---|---|
| event | The event name; do not use the "on" prefix (click NOT onclick) (required) Any of these events are applicable |
| function | The function to run when the event occurs (required) |
| useCapture | true - remove the handler from the bubbling phase false - remove the handler from the bubbling phase (default is false) |
JavaScript Notes:
- When using JavaScript, single or double quotation marks are acceptable and work identically to one another; choose whichever you prefer, and stay consistent
- JavaScript is a case-sensitive language; firstName is NOT the same as firstname
- Arrays count starting from zero NOT one; so item 1 is position [0], item 2 is position [1], and item 3 is position [2] … and so on
- JavaScript variables must begin with a letter, $, or _
- JavaScript variables are case sensitive (x is not the same as X)
We’d like to acknowledge that we learned a great deal of our coding from W3Schools and TutorialsPoint, borrowing heavily from their teaching process and excellent code examples. We highly recommend both sites to deepen your experience, and further your coding journey. We’re just hitting the basics here at 1SMARTchicken.