addEventListener on keyup javascript once

user_7914730 0
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I want to run countup(); and random(); function after I hit enter on my keyboard. But I wanna make that it's only work for the first time.I mean when first time i hit enter, it will run that function. But if those function already run and I hit enter again, it'll never effect anything.

Here's my code :

addEventListener("keydown", function(e){
    if (e.keyCode === 13) {
        countup();
        random();
    }
});

Anyone can help me? Thanks.

keydown function javascript
8 Answers

To add keydown to an element in your HTML code. 

element.addEventListener("keydown", event => {
//check if event is cancelable because not all event can be cancelled
if(event.cancelable)
   { 
       //this prevent element from executing the default event when user click
       event.preventDefault()
       if(event.keycode === 13){ //write your statement here }
   }
}

for more https://www.w3schools.com/jsref/event_preventdefault.asp

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