<!DOCTYPE HTML>
<title>test if select() API returns correct attributes</title>
<meta charset="UTF-8">
<meta name="timeout" content="long">
<link rel="author" title="Koji Tashiro" href="mailto:koji.tashiro@gmail.com">
<link rel="help" href="https://html.spec.whatwg.org/multipage/multipage/association-of-controls-and-forms.html#textFieldSelection">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id="log"></div>

<script>
  var body = document.getElementsByTagName("body").item(0);
  var dirs = ['forward', 'backward', 'none'];
  var sampleText = "0123456789";

  var createInputElement = function(value, append = true) {
    var el = document.createElement("input");
    el.type = "text";
    el.value = value;
    el.id = "input" + (append ? "-appended" : "-not-appended");
    if (append) {
      body.appendChild(el);
    }
    return el;
  };

  var createTextareaElement = function(value, append = true) {
    var el = document.createElement("textarea");
    el.value = value;
    el.id = "textarea" + (append ? "-appended" : "-not-appended");
    if (append) {
      body.appendChild(el);
    }
    return el;
  };


  test(function() {
    var text = 'a';
    for (var i=0; i<255; i++) {
      var el = createInputElement(text);
      el.select();
      var selectionText = el.value.substring(el.selectionStart, el.selectionEnd);
      assert_equals(selectionText, text, "Selection text mismatched");
      el.parentNode.removeChild(el);
      text += 'a';
    }
  }, "test if selection text is correct for input");


  test(function() {
    var text = 'a';
    for (var i=0; i<255; i++) {
      var el = createTextareaElement(text);
      el.select();
      var selectionText = el.value.substring(el.selectionStart, el.selectionEnd);
      assert_equals(selectionText, text, "Selection text mismatched");
      el.parentNode.removeChild(el);
      text += 'a';
    }
  }, "test if selection text is correct for textarea");


  test(function() {
    var text = 'あ';
    for (var i=0; i<255; i++) {
      var el = createInputElement(text);
      el.select();
      var selectionText = el.value.substring(el.selectionStart, el.selectionEnd);
      assert_equals(selectionText, text, "Selection text mismatched");
      el.parentNode.removeChild(el);
      text += 'あ';
    }
  }, "test if non-ascii selection text is correct for input");


  test(function() {
    var text = 'あ';
    for (var i=0; i<255; i++) {
      var el = createTextareaElement(text);
      el.select();
      var selectionText = el.value.substring(el.selectionStart, el.selectionEnd);
      assert_equals(selectionText, text, "Selection text mismatched");
      el.parentNode.removeChild(el);
      text += 'あ';
    }
  }, "test if non-ascii selection text is correct for textarea");


  for (var append of [true, false]) {
    test(function() {
      var el = createInputElement(sampleText, append);
      // If there is no selection, then it must return the offset(in logical order)
      // to the character that immediately follows the text entry cursor.
      assert_equals(el.selectionStart, el.value.length,
                    "SelectionStart offset without selection in " + el.id);
      el.select();
      assert_equals(el.selectionStart, 0, "SelectionStart offset");
      el.remove();
    }, "test SelectionStart offset for input that is " +
         (append ? "appended" : " not appended"));
  }

  for (var append of [true, false]) {
    test(function() {
      var el = createTextareaElement(sampleText, append);
      // If there is no selection, then it must return the offset(in logical order)
      // to the character that immediately follows the text entry cursor.
      assert_equals(el.selectionStart, el.value.length,
                    "SelectionStart offset without selection in " + el.id);
      el.select();
      assert_equals(el.selectionStart, 0, "SelectionStart offset");
      el.remove();
    }, "test SelectionStart offset for textarea that is " +
         (append ? "appended" : " not appended"));
  }

  for (var append of [true, false]) {
    test(function() {
      var el = createInputElement(sampleText, append);
      // If there is no selection, then it must return the offset(in logical order)
      // to the character that immediately follows the text entry cursor.
      assert_equals(el.selectionEnd, el.value.length,
                    "SelectionEnd offset without selection in " + el.id);
      el.select();
      assert_equals(el.selectionEnd, el.value.length, "SelectionEnd offset");
      el.remove();
    }, "test SelectionEnd offset for input that is " +
         (append ? "appended" : " not appended"));
  }


  for (var append of [true, false]) {
    test(function() {
      var el = createTextareaElement(sampleText, append);
      // If there is no selection, then it must return the offset(in logical order)
      // to the character that immediately follows the text entry cursor.
      assert_equals(el.selectionEnd, el.value.length,
                    "SelectionEnd offset without selection in " + el.id);
      el.select();
      assert_equals(el.selectionEnd, el.value.length, "SelectionEnd offset");
      el.remove();
    }, "test SelectionEnd offset for textarea that is " +
         (append ? "appended" : " not appended"));
  }

  test(function() {
    var el = createInputElement(sampleText);
    assert_in_array(el.selectionDirection, dirs, "SelectionDirection");
    el.select();
    assert_in_array(el.selectionDirection, dirs, "SelectionDirection");
    el.parentNode.removeChild(el);
  }, "test SelectionDirection for input");


  test(function() {
    var el = createTextareaElement(sampleText);
    assert_in_array(el.selectionDirection, dirs, "SelectionDirection");
    el.select();
    assert_in_array(el.selectionDirection, dirs, "SelectionDirection");
    el.parentNode.removeChild(el);
  }, "test SelectionDirection for textarea");

  promise_test(async () => {
    // cause a layout overflow
    const el = createInputElement(sampleText.repeat(100));
    el.selectionEnd = 0;
    await new Promise(requestAnimationFrame);
    assert_equals(el.scrollLeft, 0);

    el.select();
    await new Promise(requestAnimationFrame);
    assert_equals(el.scrollLeft, 0);
    el.remove();
  }, `test scrollLeft for input`);

  promise_test(async () => {
    // cause a layout overflow
    const el = createInputElement(sampleText.repeat(100));
    el.scrollLeft = 33;

    el.select();
    await new Promise(requestAnimationFrame);
    assert_equals(el.scrollLeft, 33);
    el.remove();
  }, `test scrollLeft preservation for input`);

  for (const localName of ["input", "textarea"]) {
    promise_test(async () => {
      const container = document.createElement("div");
      container.style.height = "100px";
      container.style.overflow = "scroll";
      const element = document.createElement(localName);
      element.style.marginTop = "120px";
      container.append(element);
      document.body.append(container);

      element.select();
      await new Promise(requestAnimationFrame);
      assert_equals(container.scrollTop, 0);

      container.remove();
    }, `test container.scrollTop for ${localName}`);
  }
</script>
