var containers = [1,2,3,4].map(n => document.getElementById('draggable_row_container_' + n));

function compare(a, b) {
  return +a.id.split('_')[2] - b.id.split('_')[2];
}

function fixContainer(c) {
  var children = Array.prototype.filter.call(c.childNodes, a => !!a.id);
  children.sort(compare);
  c.innerHTML = children.map(child => child.outerHTML).join(' ');
}

containers.forEach(c => fixContainer(c));