Why does != work and just = doesn't?

Question

Here\'s my code:

  if (document.getElementById(\"hiddenButton\").style.visibility != \"visible\") {
     document.getElementById(\"hiddenButton\").style.visibili         


        

Answer 1

Your condition is actually an assignment:

if (document.getElementById("hiddenButton").style.visibility = "hidden") {

You should be using ==:

if (document.getElementById("hiddenButton").style.visibility == "hidden") {