File: clipboard_paste_inputandtextarea.html

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<html>
<body>

<div id="content">
  <input
    id="testInput"
    type="text" onpaste="handlePaste(event)">
  <textarea id="testTextArea" onpaste="handlePaste(event)"></textarea>

  <label for="pasteAllowed">Paste allowed?</label><input id="pasteAllowed" type="checkbox">
</div>
<script class="testbody" type="application/javascript">
function is(a, b, msg) {
  if (!Object.is(a, b)) {
    throw new Error(`FAIL: expected ${b} got ${a} - ${msg}`);
  }
}

function checkPasteHelper(event) {
  // Set by injected JS in the test
  let filePasteAllowed = document.getElementById("pasteAllowed").checked;
  is(event.clipboardData.getData('text/plain'), filePasteAllowed ? "Just some text" : "",  "getData(text/plain) should return plain text");
  is(event.clipboardData.types.length, 1, "Correct number of types");
}

function handlePaste(e) {
  let result = null;
  try {
    result = checkPasteHelper(e);
  } catch (e) {
    result = e.toString();
  }

  document.dispatchEvent(new CustomEvent('testresult', {
    detail: { result }
  }));
}
</script>

</body>
</html>