Javascript malfunctioning - exhausted all troubleshooting options

My JavaScript code consists of a single line, but I keep encountering the "getElementById null" error.

document.getElementById("menu-background").style.left = "0";

HTML:

<html>
  <head>
    <title></title>
    <link rel="stylesheet" type="text/css" href="main.css" />
    <script type="text/javavascript" src="js/main-menu.js"></script>
  </head>
  <body>
    <div id="menu-background">
      <div id="main-menu"></div>
    </div>
  </body>
</html>

CSS:

#menu-background {
  position: fixed;
  width: 100%;
  height: 100%;
  background-image: url("images/background.png");
  background-position: center;
  background-size: cover;
  top: 0;
  text-align: center;
  left: 100%;
}
#main-menu {
  width: 60vw;
  height: 80vh;
  border-style: solid;
  border-radius: 1.125em;
  border-color: #b88a00;
  margin: auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(0, 0, 0, 0.75);
  transition: all 0.25s;
}

I am using Visual Studio Code and have ensured that the JavaScript file is linked correctly. I even tried running it directly within the HTML file with no success.

Answer №1

Below is a possible solution:

window.addEventListener('DOMContentLoaded', function(e) {
    document.getElementById("menu-background").style.left = "0";    
});

Answer №2

For optimal page loading, it is recommended to place your script element at the end of the document so that the element is defined before it is reached:

<html>
  <head>
    <title></title>
    <link rel="stylesheet" type="text/css" href="main.css" />
  </head>
  <body>
    <div id="menu-background">
      <div id="main-menu"></div>
    </div>
    <script type="text/javavascript" src="js/main-menu.js"></script>
  </body>
</html>

Answer №3

Eureka, I have discovered the solution!

After changing the name of my HTML file from "main.html" to "index.html", everything started working perfectly!

A huge thank you for the quick responses, everyone. As a newcomer in this community, your help means a lot.

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