<!doctype html>
<meta charset=utf-8>
<title>HTMLSelectElement ask for reset</title>
<link rel="author" title="Dongie Agnir" href="dongie.agnir@gmail.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<script>
test(function() {
  var select = makeSelect(5);

  select.children[4].selected = true;
  unselectedExcept(select, 4);

  select.children[4].remove();
  unselectedExcept(select, 0); // remove selected node, should default to first

  select.children[3].selected = true;

  select.children[0].remove();
  unselectedExcept(select, 2); // last node still selected

  select.size = 2;
  select.children[2].remove();

  unselectedExcept(select, null);
}, "ask for reset on node remove, non multiple.");

test(function() {
  var select = makeSelect(3);
  select.children[1].selected = true;

  // insert selected option, should remain selected
  var opt4 = document.createElement("option");
  opt4.selected = true;
  select.appendChild(opt4);
  unselectedExcept(select, 3);

  // insert unselected, 3 should remain selected
  var opt5 = document.createElement("option");
  select.appendChild(opt5);
  unselectedExcept(select, 3);
}, "ask for reset on node insert, non multiple.");

test(function() {
  var select = makeSelect(3);

  var options = select.children;

  // select options from first to last
  for (var i = 0; i < options.length; ++i) {
    options[i].selected = true;
    unselectedExcept(select, i);
  }

  // select options from last to first
  for (var i = options.length - 1; i >= 0; --i) {
    options[i].selected = true;
    unselectedExcept(select, i);
  }

  options[2].selected = true;
  options[2].selected = false; // none selected
  unselectedExcept(select, 0);

  // disable first so option at index 1 is first eligible
  options[0].disabled = true;
  options[2].selected = true;
  options[2].selected = false; // none selected
  unselectedExcept(select, 1);

  select.size = 2;
  options[1].selected = false;
  unselectedExcept(select, null); // size > 1 so should not default to any
}, "change selectedness of option, non multiple.");


function unselectedExcept(sel, opt) {
  for (var i = 0; i < sel.children.length; ++i) {
    if (i != opt) {
      assert_false(sel.children[i].selected, "option should not be selected.");
    }
    if (opt != null) {
      assert_true(sel.children[opt].selected, "option should be selected.");
    }
  }
}

function makeSelect(n) {
  var sel = document.createElement("select");
  for (var i = 0; i < n; ++i) {
    opt = document.createElement("option");
    sel.appendChild(opt);
  }
  return sel;
}
</script>