test_datalist_dynamic.html

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<!DOCTYPE HTML>

<html>

<title>Dynamic change datalist</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<script src="/tests/SimpleTest/EventUtils.js"></script>

<script src="satchel_common.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css" />

<input list="suggest" type="text" name="field1">

<datalist id="suggest">

  <option value="a1">

  <option value="a2">

  <option value="ab1">

  <option value="ab2">

</datalist>

<script>

const { TestUtils } = SpecialPowers.ChromeUtils.importESModule(

  "resource://testing-common/TestUtils.sys.mjs"

);

const DATALIST_DATA = {

  "a": ["a1", "a2", "ab1", "ab2"],

  "ab": ["ab1", "ab2", "abc1", "abc2"],

  "abc": ["abc1", "abc2", "abcd1", "abcd2"],

  "abcd": ["abcd1", "abcd2", "abcde1", "abcde2", "abcde3"]

};

add_task(async function() {

  const input = document.querySelector("input");

  const datalist = document.querySelector("datalist");

  async function inputHandler() {

    const options = DATALIST_DATA[input.value] || [];

    await TestUtils.waitForTick();

    while (datalist.firstChild) {

      datalist.firstChild.remove();

    for (const option of options) {

      const element = document.createElement("option");

      element.setAttribute("value", option);

      datalist.appendChild(element);

  await SimpleTest.promiseFocus();

  input.addEventListener("input", inputHandler);

  input.focus();

  synthesizeKey("a");

  synthesizeKey("b");

  synthesizeKey("c");

  is(input.value, "abc", "<input>'s value has to be abc for initial data");

  await notifyMenuChanged(4);

  let values = getMenuEntries().labels;

  is(values.length, 4, "expected count of datalist popup");

  for (let i = 0; i < values.length; i++) {

    is(values[i], DATALIST_DATA[input.value][i], "expected data #" + i);

  let promise = notifyMenuChanged(5);

  synthesizeKey("d");

  is(input.value, "abcd", "<input>'s value has to be abcd for next test");

  synthesizeKey("KEY_ArrowDown");

  await promise;

  values = getMenuEntries().labels;

  is(values.length, 5, "expected count of datalist popup");

  for (let i = 0; i < values.length; i++) {

    is(values[i], DATALIST_DATA[input.value][i], "expected data #" + i);

  synthesizeKey("KEY_ArrowDown");

  synthesizeKey("KEY_Enter");

  is(input.value, "abcd1", "<input>'s value has to set abcd1");

  input.removeEventListener("input", inputHandler);

});

</script>

</html>