JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input type="text" name="testtextortexttest" value="Whatever you write, sir."/>
    <input type="text" name="moretesttextormoretexttest" value="Whatever you write, again, sir."/>

    <input type="submit" name="test1" value="Action 1"/>
    <input type="submit" name="test2" value="Action 2"/>
    <input type="submit" name="test3" value="Action 3"/>
    <input type="submit" name="test4" value="Action 4"/>
    <input type="submit" name="test5" value="Action 5"/>
    </form>

CSS

input {display:block}

JavaScript

$("form").submit(function(e) {
  e.preventDefault();
  // Use this for rare/buggy cases when click event is sent after submit
  setTimeout(function() {

    var $this=$(this);
    var lastFocus = $this.data("lastFocus");
    var $defaultSubmit=null;

    if(lastFocus) $defaultSubmit=$(lastFocus);

    if(!$defaultSubmit || !$defaultSubmit.is("input[type=submit]")) {
      // If for some reason we don't have a submit, find one (the first)
      $defaultSubmit=$(this).find("input[type=submit]").first();
    }

    if($defaultSubmit) {
      var submitName=$defaultSubmit.attr("name");
      var submitLabel=$defaultSubmit.val();

      // Just a demo, set hilite and alert
      doSomethingWith($defaultSubmit);
      setTimeout(function() {alert("Submitted "+submitName+": '"+submitLabel+"'")},1000);
    } else {
      // There were no submit in the form
    }

  }.bind(this),0);

});

$("form input").focus(function() {
  $(this.form).data("lastFocus", this);
});
$("form input").click(function() {
  $(this.form).data("lastFocus", this);
});

// Just a demo, setting hilite
function doSomethingWith($aSelectedEl) {
  $aSelectedEl.css({"border":"4px solid red"});
  setTimeout(function() { $aSelectedEl.removeAttr("style"); },1000);
}