Clipboard: read() Methode

read()
read(formats)

<img id="source" src="butterfly.jpg" alt="A butterfly" />
<img id="destination" src="" alt="Pasted image" />
<button id="reload" type="button">Reload</button>
<p id="log"></p>

img {
  height: 100px;
  width: 100px;
  margin: 0 1rem;
  border: 1px solid black;
}
#reload {
  display: block;
  margin: 0 1rem;
}

const logElement = document.querySelector("#log");
function log(text) {
  logElement.innerText = `Error: ${text}`;
}

const reload = document.querySelector("#reload");

reload.addEventListener("click", () => {
  window.location.reload(true);
});

const destinationImage = document.querySelector("#destination");
destinationImage.addEventListener("click", pasteImage);

async function pasteImage() {
  try {
    const clipboardContents = await navigator.clipboard.read();
    for (const item of clipboardContents) {
      if (!item.types.includes("image/png")) {
        throw new Error("Clipboard does not contain PNG image data.");
      }
      const blob = await item.getType("image/png");
      destinationImage.src = URL.createObjectURL(blob);
    }
  } catch (error) {
    log(error.message);
  }
}

<img id="source_jpg" src="butterfly.jpg" alt="JPG butterfly image" />
<div id="destination">Click here to copy clipboard data.</div>
<button id="reload" type="button">Reload</button>
<p id="log"></p>

img {
  height: 100px;
  width: 100px;
  margin: 0 1rem;
  border: 1px solid black;
}

#destination {
  min-height: 300px;
  min-width: 90%;
  margin: 0 1rem;
  border: 1px solid black;
}

#reload {
  display: block;
  margin: 0 1rem;
}

const logElement = document.querySelector("#log");
function log(text) {
  logElement.innerText = `Error: ${text}`;
}

const reload = document.querySelector("#reload");

reload.addEventListener("click", () => {
  window.location.reload(true);
});

const destinationDiv = document.querySelector("#destination");
destinationDiv.addEventListener("click", pasteData);

async function pasteData() {
  destinationDiv.innerText = ""; // Clear inner text
  try {
    const clipboardContents = await navigator.clipboard.read();
    for (const item of clipboardContents) {
      for (const mimeType of item.types) {
        const mimeTypeElement = document.createElement("p");
        mimeTypeElement.innerText = `MIME type: ${mimeType}`;
        destinationDiv.appendChild(mimeTypeElement);
        if (mimeType === "image/png") {
          const pngImage = new Image();
          pngImage.alt = "PNG image from clipboard";
          const blob = await item.getType("image/png");
          pngImage.src = URL.createObjectURL(blob);
          destinationDiv.appendChild(pngImage);
        } else if (mimeType === "text/html") {
          const blob = await item.getType("text/html");
          const blobText = await blob.text();
          const clipHTML = document.createElement("pre");
          clipHTML.innerText = blobText;
          destinationDiv.appendChild(clipHTML);
        } else if (mimeType === "text/plain") {
          const blob = await item.getType("text/plain");
          const blobText = await blob.text();
          const clipPlain = document.createElement("pre");
          clipPlain.innerText = blobText;
          destinationDiv.appendChild(clipPlain);
        } else {
          throw new Error(`${mimeType} not supported.`);
        }
      }
    }
  } catch (error) {
    log(error.message);
  }
}

<textarea id="source" rows="5">
  <style>h1 {color: red;} p {color: blue;}</style>
  <h1>Hello world!</h1>
  <p>This is a test.</p>
  <script>alert('Hello world!');</script>
</textarea>
<button id="copy">Copy HTML</button>
<button id="paste_normal">Paste HTML</button>
<button id="paste_unsanitized">Paste unsanitized HTML</button>
<textarea id="destination" rows="5"></textarea>

body {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 5px;
}

textarea {
  grid-column: 1 / span 3;
}

const copyButton = document.getElementById("copy");
const pasteButton = document.getElementById("paste_normal");
const pasteUnsanitizedButton = document.getElementById("paste_unsanitized");
const sourceTextarea = document.getElementById("source");
const destinationTextarea = document.getElementById("destination");

copyButton.addEventListener("click", async () => {
  const text = sourceTextarea.value;
  const type = "text/html";
  const blob = new Blob([text], { type });
  const data = [new ClipboardItem({ [type]: blob })];

  try {
    await navigator.clipboard.write(data);
  } catch (error) {
    destinationTextarea.value = `Clipboard write failed: ${error}`;
  }
});

async function getHTMLFromClipboardContents(clipboardContents) {
  for (const item of clipboardContents) {
    if (item.types.includes("text/html")) {
      const blob = await item.getType("text/html");
      const blobText = await blob.text();
      return blobText;
    }
  }

  return null;
}

pasteButton.addEventListener("click", async () => {
  try {
    const clipboardContents = await navigator.clipboard.read();
    const html = await getHTMLFromClipboardContents(clipboardContents);
    destinationTextarea.value =
      html || "Could not find HTML data in the clipboard.";
  } catch (error) {
    destinationTextarea.value = `Clipboard read failed: ${error}`;
  }
});

pasteUnsanitizedButton.addEventListener("click", async () => {
  try {
    const clipboardContents = await navigator.clipboard.read({
      unsanitized: ["text/html"],
    });
    const html = await getHTMLFromClipboardContents(clipboardContents);
    destinationTextarea.value =
      html || "Could not find HTML data in the clipboard.";
  } catch (error) {
    destinationTextarea.value = `Clipboard read failed: ${error}`;
  }
});