File: clipboard_paste_changingclipboardinternal.html

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<html>
<body>

<div id="content">
  <div
    id="testDiv"
    contenteditable="true"
    onpaste="handlePaste(event)"></div>
    <input id="testInput" type="text" onpaste="handlePaste(event)">
  <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) {
  let pasteAllowed = document.getElementById("pasteAllowed").checked;
  is(event.clipboardData.getData('text/plain'), pasteAllowed ? "Original text" : "",  "getData(text/plain) got wrong value");
  is(event.clipboardData.types.length, pasteAllowed ? 1 : 0, "Correct number of types");
  document.execCommand("copy");
}

document.addEventListener("copy", e => {
  e.preventDefault();
  e.clipboardData.setData("text/plain", "New text");
});

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>