JSFiddle - React, Tailwind, and code Playground

HTML

<form action="/findNames">
    <input type="submit" value="Add" />
    <input type="submit" value="Find" />
</form>

JavaScript

var clicked;
var buttons = document.getElementsByTagName("input");

for(var i = 0; i < buttons.length;i++)
{
    var elem = buttons[i];
    if(elem.type=="submit")
    {
        elem.addEventListener("click", function(){ clicked=this.value;}, false);
    }
}


window.onsubmit = function(e)
{
   alert(clicked);
    return true;
}