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Clipboardchange event explainer document (MicrosoftEdge#850)
Create clipboardchange event explainer
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‎ClipboardAPI/clipboard-change-event-example-app.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Clipboard Format Checker</title>
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<script>
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const isClipboardChangeEventAvailable = true;
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async function checkClipboard() {
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try {
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console.log("Clipboard changed!");
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const clipboardItems = await navigator.clipboard.read();
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let formats = {};
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for (const item of clipboardItems) {
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if (item.types.includes('text/plain')) {
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const textBlob = await item.getType('text/plain');
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const text = await textBlob.text();
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document.getElementById('clipboardText').innerText = text;
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formats.text = true;
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}
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else {
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document.getElementById('clipboardText').innerText = "N/A";
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}
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if (item.types.includes('image/png') || item.types.includes('image/jpeg')) {
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const imgBlob = await item.getType(item.types.find(type => type.startsWith('image/')));
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const imgUrl = URL.createObjectURL(imgBlob);
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document.getElementById('clipboardImg').innerHTML = `<img src="${imgUrl}" alt="Clipboard Image" width="150">`;
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formats.img = true;
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}
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else {
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document.getElementById('clipboardImg').innerText = "N/A";
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}
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if (item.types.includes('text/html')) {
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const htmlBlob = await item.getType('text/html');
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const html = await htmlBlob.text();
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document.getElementById('clipboardHtml').innerText = html;
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formats.html = true;
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}
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else {
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document.getElementById('clipboardHtml').innerText = "N/A";
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}
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}
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document.getElementById('pasteText').disabled = !formats.text;
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document.getElementById('pasteImg').disabled = !formats.img;
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document.getElementById('pasteHtml').disabled = !formats.html;
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} catch (err) {
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console.error('Failed to read clipboard contents: ', err);
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}
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}
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if (isClipboardChangeEventAvailable) {
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// Try to read the clipboard to trigger a permissions prompt if required.
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navigator.clipboard.readText().then(() => {
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console.log("Clipboard read permission granted");
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// Invoke the on clipboardchange handler on page load to initialize current UI state
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checkClipboard();
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// Start listening to the clipboardchange event
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navigator.clipboard.addEventListener("clipboardchange", checkClipboard);
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});
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}
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else {
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// Invoke the on clipboardchange handler on page load to initialize current UI state
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checkClipboard();
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// Since clipboardchange event is not available, fallback to polling
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setInterval(checkClipboard, 2000);
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}
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</script>
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</head>
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<body>
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<h1>Clipboardchange event demo app - Paste formats viewer</h1>
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<p>
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This HTML application demonstrates the use of the clipboardchange event to monitor
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and display clipboard data in various formats. The app listens for changes to the
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clipboard using the clipboardchange event. It then displays the clipboard data in a table
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with columns for Text, Image, and HTML formats.
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<br />
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When the clipboard content changes, the app updates the table to show the current clipboard data.
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The app includes buttons for pasting clipboard data as Text, Image, and HTML.
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These buttons are initially disabled and are enabled based on the available clipboard formats.
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</p>
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<hr />
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<button id="pasteText" disabled>Paste as Text</button>
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<button id="pasteImg" disabled>Paste as Image</button>
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<button id="pasteHtml" disabled>Paste as HTML</button>
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<br />
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<hr />
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<table border="1">
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<thead>
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<tr>
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<th>Text</th>
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<th>Image</th>
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<th>HTML</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td id="clipboardText">N/A</td>
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<td id="clipboardImg">N/A</td>
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<td id="clipboardHtml">N/A</td>
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</tr>
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</tbody>
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</table>
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</body>
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</html>

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