html button execute javascript code example
Example 1: javascript onclick
var myElem = document.getElementByID('ElemID');
myElem.onclick = function() {
//do stuff
}
Example 2: javascript onclick button
var button = document.querySelector('button');
button.onclick = function() {
//do stuff
}
Example 3: how to make a button execute a javascript function
<button onclick"function name">Click</button>