change-to-empty-value.html (1366B)
1 <!doctype html> 2 <meta charset="utf-8"> 3 <title>Change event when clearing a textarea</title> 4 <link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez"> 5 <link rel="author" href="https://mozilla.org" title="Mozilla"> 6 <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1881457"> 7 <script src="/resources/testharness.js"></script> 8 <script src="/resources/testharnessreport.js"></script> 9 <script src="/resources/testdriver.js"></script> 10 <script src="/resources/testdriver-actions.js"></script> 11 <script src="/resources/testdriver-vendor.js"></script> 12 <textarea>abc</textarea> 13 <script> 14 promise_test(async function() { 15 let textarea = document.querySelector("textarea"); 16 let changeFired = false; 17 textarea.addEventListener("change", () => { 18 changeFired = true; 19 }, { once: true }); 20 21 textarea.focus(); 22 assert_equals(document.activeElement, textarea, "Should focus textarea"); 23 assert_false(changeFired, "Shouldn't have fired change event after focus"); 24 textarea.select(); 25 const kBackspaceKey = "\uE003"; 26 await test_driver.send_keys(textarea, kBackspaceKey) 27 assert_false(changeFired, "Shouldn't have fired change event after select"); 28 textarea.blur(); 29 assert_true(changeFired, "Should've have fired change event after blur"); 30 assert_equals(textarea.value, "", "Should've have cleared the value"); 31 }); 32 </script>