CODE EXAMPLE FOR JAVASCRIPT

javascript button onclick

// Here you can use getElementById 
// or getElementByClassName or getElementByTagName...
// Example #1
document.getElementById("button").onclick = function() {
	alert("Hello World!");
}

// Example #2
let obj = document.getElementsByClassName('button');
obj.addEventListener("click", function() {
    // your code here...
});

// Example #3 (getting attributes)
let obj = document.getElementById("button")
obj.onclick = function() {
  	obj.style.display = "none";
	// or:
  	// obj.style = "display: none; color: #fff"
}