JSFiddle - React, Tailwind, and code Playground

HTML

<div id='myDiv' style="border: 1px, solid, black"> Click me!! </div>

JavaScript

var Constructor = function(name, value) {
    var self = this;
    self.name = name;
    self.value = value;
    self.someHandler = function(e) {
        e.target.innerHTML = self.name + self.value; // self undefined    
    }
    return self;
};

var myObject = Constructor('myName', 'myValue');
document.getElementById('myDiv').onclick = myObject.someHandler;