Get cursor position at frequent interval

Question

I'm trying to get mouse cursor current position at frequent interval.

function checkMousePos(ev){
            alert(true);
            var x = ev.clientX,
            y = ev.clientY;
            alert('' + x + ' ' + y);
}

setInterval(checkMousePos, 500);

This code alerts true, but never x and y.

What am I not doing right ?

https://stackoverflow.com/questions/7790725/javascript-track-mouse-position — Pranav C Balan, Mar 25 '19 at 17:09
@PranavCBalan The linked post is with mousemove. I'm looking to get position at regular interval, with or without (mouse)move. — , Mar 25 '19 at 17:12
@tmpsp52 - `ev` parameter which is being expected as `event` is not `event` in your case.. — Rayon, Mar 25 '19 at 17:12
@tmpsp52 : check this : https://stackoverflow.com/a/7790764/3037257 — Pranav C Balan, Mar 25 '19 at 17:12
@tmpsp52 - As your handler is not invoked by some event of mouse, you can not actually. Global `window.event` could be used though as suggested by *Pranav* — Rayon, Mar 25 '19 at 17:15
Thank you both. Let me look to this global 'window.event' then. — , Mar 25 '19 at 17:19
@PranavCBalan Thank you! But it seems it also does not alert x and y. — , Mar 25 '19 at 17:23
@tmpsp52 : try this https://stackoverflow.com/a/7790764/3037257 — Pranav C Balan, Mar 25 '19 at 17:23
@PranavCBalan : Thank you. This is instructive. I understand what I'm trying to achieve is not really possible with a setinterval method. — , Mar 25 '19 at 17:48

score 1 · Accepted Answer · answered Mar 25 '19 at 17:24

1

When debugging something you far better using something like console.log(myVariable) and then viewing it in the console. In your case ev not being pass by your interval and there for it's undefined. What seems like this:

var x;
var y;

document.addEventListener('mousemove', function(event){
    x = event.pageX;
    y = event.pageY;
})

function checkMousePos(){
    console.log("Cursor at: " + x + ", " + y);
}

setInterval(checkMousePos, 500);

Although it's usually not the best solution.

answered Mar 25 '19 at 17:24

Alex Kislukhin

39
2

Not in relation to your answer but in regard to your output location. If I am doing a quick bit of debugging I still throw things out to document.title. It's a bit old school but it stops you needing to swap between the browser and the dev tools (normally where the console exists) to see the result. – Ric Mar 25 '19 at 17:28
Thank you Alex. This results in Cursor at: undefined, undefined. – Mar 25 '19 at 17:30

Get cursor position at frequent interval

1 Answers1