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<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta charset="utf-8">
<style>
html, body {
margin: 0;
font-family: -apple-system;
}
#plain, #rich, #destination {
width: 100%;
height: 150px;
margin: 0;
}
img {
width: 150px;
height: 150px;
}
#destination {
border: 4px dashed lightgray;
caret-color: transparent;
}
#destination:focus {
outline: none;
border: 4px dashed lightgreen;
}
#plain, #rich {
font-size: 125px;
white-space: nowrap;
border: 1px solid black;
}
#output {
width: 100%;
height: 150px;
}
</style>
<body>
<textarea id="plain">Plain text</textarea>
<div id="rich"><strong style="color: purple">Rich text</strong></div>
<div id="destination" contenteditable></div>
<textarea id="output"></textarea>
<label>Write custom data? </label><input id="checkbox" type="checkbox"></input>
</body>
<script>
// The contents of this `result` dictionary will contain a map of {event type => {MIME type => data}}.
result = {};
// Setting this flag to `true` allows the page to write custom MIME types via the DataTransfer when dragging or copying.
writeCustomData = false;
// Setting this flag to `true` strips out inline styles in markup generated when getting "text/html" from a DataTransfer.
ignoreInlineStyles = false;
// Entries in this dictionary will be supplied as custom data using DataTransfer.setData when dragging or copying.
// This is prepopulated with sample data by default, but tests may override this as needed.
customData = {
"text/plain" : "ben bitdiddle",
"foo/plain" : "eva lu ator",
"text/html" : "<b>bold text</b>",
"bar/html" : `<i>italic text</i>`,
"text/uri-list" : "https://www.apple.com",
"baz/uri-list" : "https://www.webkit.org"
};
function stripInlineStylesFromPasteboardData(data)
{
const parsedDocument = new DOMParser().parseFromString(data, "text/html");
const treeWalker = parsedDocument.createTreeWalker(parsedDocument.body, NodeFilter.SHOW_ELEMENT);
while (treeWalker.nextNode())
treeWalker.currentNode.removeAttribute("style");
return parsedDocument.body.innerHTML;
}
function updateResultWithEvent(event) {
let pasteboard = event.dataTransfer || event.clipboardData;
const eventData = {};
for (const type of pasteboard.types) {
let pasteboardData = pasteboard.getData(type);
if (ignoreInlineStyles && type === "text/html")
pasteboardData = stripInlineStylesFromPasteboardData(pasteboardData);
eventData[type] = pasteboardData;
}
result[event.type] = eventData;
if (event.type === "paste" || event.type === "drop") {
output.value = JSON.stringify(result, null, " ");
result = {};
}
event.preventDefault();
}
function setCustomData(event) {
if (!writeCustomData)
return true;
const pasteboard = event.dataTransfer || event.clipboardData;
pasteboard.clearData();
for (const type in customData)
pasteboard.setData(type, customData[type]);
if (event.type === "copy")
event.preventDefault();
}
destination.addEventListener("dragover", updateResultWithEvent);
destination.addEventListener("paste", updateResultWithEvent);
destination.addEventListener("drop", updateResultWithEvent);
[plain, rich].forEach(source => {
source.addEventListener("dragstart", setCustomData);
source.addEventListener("copy", setCustomData);
});
function select(element) {
if (element.setSelectionRange && element.value)
element.setSelectionRange(0, element.value.length);
else
getSelection().setBaseAndExtent(element, 0, element, 1);
}
checkbox.addEventListener("change", () => window.writeCustomData = checkbox.checked);
</script>
</html>
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