- Tags: JS Window
- Categories: JavaScript Methods, JavaScript Reference, Reference
Quick Reference
The Window clearInterval() method clears a timer set with the setInterval() method.
<!-- html element to place output -->
<p id="my_output"></p>
The following sets a timer that resets every one second (1000ms). The timer is then placed on the page. And then we would have a button, that when pressed by the user, calls the function on lines 11-13 and stops the timer.
// timer
let my_interval = setInterval(my_timer, 1000);
// place time on the page
function my_timer() {
let date = new Date();
document.getElementById('my_output').innerHTML = date.toLocaleTimeString();
}
// function to stop timer
function my_stop_timer() {
clearInterval(my_interval);
}
Output
2:27:39 PM <!-- stopped timer -->
Syntax
clearInterval(intervalId)
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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)
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