Splitting dynamically created buttons into rows Javascript/HTML

Question

I am trying to create a virtual keyboard from scratch. So far I have a function that creates a button based on a character it's been given:

function keyButton(char) { //makes a button out of a string/char
  var btn = document.createElement("button"); //create button
  btn.innerText = char; //fill it with char
  btn.onclick = function () { keyStroke(this); };
  return btn;
}

The second part of my code splits a typical qwerty setup and creates a button with each individual letter:

var keyList = "QWERTYUIOPASDFGHJKLZXCVBNM";
for (i in keyList) //loops through qwerty keyboard and uses keyButton
{
  var button = keyButton(keyList[i]);
  if (i < 11)
    //give that an element which identifies it as first row
   //document.body.appendChild(button) 
  else if (i < 20)
    //give that an element which identifies it as second row
  else {
    //give that an element which identifies it as third row

  }

I am trying to make it so that buttons aren't all one next to another but rather separated in columns of 10 keys, then 9 keys, then 7 keys. I don't know where to start to achieve this. Thanks fo the help!

Answer 1

 function keyButton(char, num) { var btn = document.createElement("button"); btn.innerText = char; btn.onclick = function () { keyStroke(this); }; btn.dataset.num = num; if(num == 10 || num == 19) { btn.className = 'break'; } keyboard.appendChild(btn); return btn; } var keyList = "QWERTYUIOPASDFGHJKLZXCVBNM"; var keyboard = document.getElementById('keyboard'); for (i in keyList) //loops through qwerty keyboard and usesn { keyButton(keyList[i], i); } 

 button { float: left; display: block; } button.break { clear: left; } 

 <div id="keyboard"></div>