Question

I have a javascript function that is supposed to make visible objects hidden and hidden objects visible. since I lack of basic javascript knowlegde, I came here to ask help from you :/ Can someone help me out with my code so that I can learn a little?

function DisplayMenu(obj) {
            if (obj.style.visibility == 'visible') {
                obj = document.getElementById(obj);
                obj.style.visibility = 'hidden';
            }
            else if (obj.style.visibility == 'hidden') {
                obj = document.getElementById(obj);
                obj.style.visibility = 'visible';
            }
        }

Answer 1

You need to define what obj is before the if:

function DisplayMenu(obj) {
    var obj = document.getElementById(obj);
            if (obj.style.visibility == 'visible') {
                obj.style.visibility = 'hidden';
            }
            else {
                obj.style.visibility = 'visible';
            }
        }

EDIT: You could simplify it, you don’t need the else if just use else