Clash Royale CLAN TAG#URR8PPP

TypeError: Cannot read property 'offsetParent' of null when navigatin to another page

I'm using a code to stick a div on top when scrolling and the div reaches the top.

The code is working correctly but i'm getting a error when navigating to another page .

TypeError: Cannot read property 'offsetParent' of null


My code

render()
var startProductBarPos = -1;
window.onscroll = function ()
var bar = document.getElementById('nav');

if (startProductBarPos < 0) startProductBarPos = findPosY(bar);

if (window.pageYOffset > startProductBarPos)
bar.style.position = 'fixed';
bar.style.width = '58.6%'
bar.style.top = 0;
else
bar.style.position = 'relative';
bar.style.width = '100%'


;

function findPosY(obj)
var curtop = 0;
if (typeof (obj.offsetParent) != 'undefined' && obj.offsetParent)
while (obj.offsetParent)
curtop += obj.offsetTop;
obj = obj.offsetParent;


curtop += obj.offsetTop;
else if (obj.y)
curtop += obj.y;

return curtop;
;

return(
<div className="trait_type_header" id="nav">
</div>
);



This is line it's showing where the error is.

if (typeof (obj.offsetParent) != 'undefined' && obj.offsetParent) {


I think when navigating to another page obj becomes null. If that's the case how can i fix it?

obj

var bar = document.getElementById('nav');

1 Answer
1

Try to change

if (typeof (obj.offsetParent) != 'undefined' && obj.offsetParent)


to

if (obj && obj.offsetParent)


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