library to copy plain and html MIME types to the clipboard
此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.gf.qytechs.cn/scripts/491896/1516188/Copy%20Text%20and%20HTML%20to%20Clipboard.js
// ==UserScript==
// @name Copy Text and HTML to Clipboard
// @namespace https://greasyfork.org/en/users/906106-escctrl
// @description library to copy plain and html MIME types to the clipboard
// @author escctrl
// @version 2.0
// @grant none
// @license MIT
// ==/UserScript==
// solution for setting richtext clipboard content found at https://jsfiddle.net/jdhenckel/km7prgv4/3/
// and https://stackoverflow.com/questions/34191780/javascript-copy-string-to-clipboard-as-text-html/74216984#74216984
/* different modes for copying:
* txt = only plaintext = when a text or url should never be formatted, even if the target supports richtext
* fmt = visible HTML (MIME are same) = when richtext programs should paste formatted text (chat), and plaintext fields should paste the HTML (Ao3 comments)
* invisible HTML (MIME differ) = when richtext programs should paste formatted text, but if the program doesn't support it (e.g. Notepad), copy some other plain text (no HTML visible)
*/
function copy2Clipboard(e, mode, plain, html=null) {
if (!plain) { // stop if null, undefined, or "". we always expect plaintext content as a minimum
console.log('Copying to Clipboard failed: no text was given to copy');
return;
}
// if no separate html content is given but html MIME is supposed to be filled, we reuse the plain content
if (mode === "fmt" && !html) html = plain;
// trying first with the new Clipboard API
try {
let clipboardItem;
// 'only plaintext' mode does not provide the text/html MIME type so it can't be used by richtext programs
if (mode === "txt") clipboardItem = new ClipboardItem({ 'text/plain': new Blob([plain], {type: 'text/plain'}) });
else clipboardItem = new ClipboardItem({ 'text/html': new Blob([html], {type: 'text/html'}),
'text/plain': new Blob([plain], {type: 'text/plain'}) });
navigator.clipboard.write([clipboardItem]);
}
// fallback method in case clipboard.write is not enabled - especially in Firefox it's disabled by default
// to enable, go to about:config and turn dom.events.asyncClipboard.clipboardItem to true
catch(err) {
function listener(e) {
e.clipboardData.setData("text/plain", plain);
if (mode === "fmt") e.clipboardData.setData("text/html", html);
e.preventDefault();
}
document.addEventListener("copy", listener);
document.execCommand("copy");
document.removeEventListener("copy", listener);
}
}