test_input_textarea_set_value_no_scroll.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=829606

-->

<head>

  <meta charset="utf-8">

  <title>Test for Bug 829606</title>

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

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

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

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

  <script type="application/javascript">

  /** Test for Bug 829606 **/

/*

   * This test checks that setting .value on an text field (input or textarea)

   * doesn't scroll the field to its beginning.

*/

  SimpleTest.waitForExplicitFinish();

  var gTestRunner = null;

  async function test(aElementName)

    var element = document.getElementsByTagName(aElementName)[0];

    element.focus();

    var baseSnapshot = await snapshotWindow(window);

    // This is a sanity check.

    var s2 = await snapshotWindow(window);

    var results = compareSnapshots(baseSnapshot, await snapshotWindow(window), true);

    ok(results[0], "sanity check: screenshots should be the same");

    element.selectionStart = element.selectionEnd = element.value.length;

    setTimeout(function() {

      sendString('f');

      requestAnimationFrame(async function() {

        var selectionAtTheEndSnapshot = await snapshotWindow(window);

        results = compareSnapshots(baseSnapshot, selectionAtTheEndSnapshot, false);

        ok(results[0], "after appending a character, string should have changed");

        // Re-setting value shouldn't change anything.

        // eslint-disable-next-line no-self-assign

        element.value = element.value;

        var tmpSnapshot = await snapshotWindow(window);

        results = compareSnapshots(baseSnapshot, tmpSnapshot, false);

        ok(results[0], "re-setting the value should change nothing");

        results = compareSnapshots(selectionAtTheEndSnapshot, tmpSnapshot, true);

        ok(results[0], "re-setting the value should change nothing");

        element.selectionStart = element.selectionEnd = 0;

        element.blur();

        gTestRunner.next();

});

    }, 0);

  // This test checks that when a textarea has a long list of values and the

  // textarea's value is then changed, the values are shown correctly.

  async function testCorrectUpdateOnScroll()

    var textarea = document.createElement('textarea');

    textarea.rows = 5;

    textarea.cols = 10;

    textarea.value = 'a\nb\nc\nd';

    document.getElementById('content').appendChild(textarea);

    var baseSnapshot = await snapshotWindow(window);

    textarea.value = '1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n';

    textarea.selectionStart = textarea.selectionEnd = textarea.value.length;

    var fullSnapshot = await snapshotWindow(window);

    var results = compareSnapshots(baseSnapshot, fullSnapshot, false);

    ok(results[0], "sanity check: screenshots should not be the same");

    textarea.value = 'a\nb\nc\nd';

    var tmpSnapshot = await snapshotWindow(window);

    results = compareSnapshots(baseSnapshot, tmpSnapshot, true);

    ok(results[0], "textarea view should look like the beginning");

    setTimeout(function() {

      gTestRunner.next();

    }, 0);

  function* runTest()

    test('input');

    yield undefined;

    test('textarea');

    yield undefined;

    testCorrectUpdateOnScroll();

    yield undefined;

    SimpleTest.finish();

  gTestRunner = runTest();

  SimpleTest.waitForFocus(function() {

    gTestRunner.next();

  });;

  </script>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=829606">Mozilla Bug 829606</a>

<p id="display"></p>

<div id="content">

  <textarea rows='1' cols='5' style='-moz-appearance:none;'>this is a \n long text</textarea>

  <input size='5' value="this is a very long text" style='-moz-appearance:none;'>

</div>

<pre id="test">

</pre>

</body>

</html>