I know I'm a beginner at this, but I really need to learn the rules. I'm trying to make a simple example of javascript. Its a box with three buttons, but for some reason only one of them works. They do have different ID types, so there must be another rule I don't know.
<!DOCTYPE html>
<html>
<head>
<title>Javascript box</title>
</head>
<body>
<p>Press buttons to change the box</p>
<div id="box" style="height:100px; width:100px; background-color: limegreen; margin:50px"></div>
<br>
<button id="less">less</button>
<button id="more">more</button>
<button id="none">Reset</button>
<script type="text/javascript">
document.getElementById("less").addEventListener("click", function(){
document.getElementById("box").style.height = "25px";
});
document.getElementByID("more").addEventListener("click", function(){
document.getElementById("box").style.height = "150px";
});
document.getElementById("none").addEventListener("click", function(){
document.getElementById("box").style.height = "100px";
});
</script>
</body>
</html>
For the second addEventListener, there's a typo.
In document.getElementByID, the D should not be capitalised.
A good way to debug these issues is to look at the console in developer tools.