Question

here is my code

var url = window.location.href;
if (url.substr(7, 21) === "www.codtelevision.com")
 {
    //Valid domain
    if (url.substr(29) === "")
    {
        document.getElementById('homeLink').className = "active";
    }
    else 
    {
        document.getElementById(url.substr(29) + "Link").className = "active";
    }
}

When i look in my chrome developer tools, i see this error.

Uncaught TypeError: Cannot set property 'className' of null

I have tried so many times to fix it but can not. How do i get this to work?

Also, when i just put this in the console, it works:

document.getElementById('homeLink').className = "active";

My website is http://www.codtelevision.com

Answer 1

maybe your document is not loaded. put your code inside window.onload .

window.onload = function(){
   //code
}

or if you are using jquery:

$(document).ready(function(){
   //code
});