Add a "Copy" button to copy redmine ticket subject along with priority and link

redmine-link.js

var priority = $("td.priority").text();

$(".subject div").first().prepend("<div>[" + priority + "]</div>");
$(".subject div").first().append(
    "<div> <a href='" + document.location + "'>"+ document.location + "</a></div>"    
);

$(".subject").first().append(
    "<button id='copyButton'>Copy</button>"
);

document.getElementById("copyButton").addEventListener("click", function() {
    copyToClipboard($(".subject div").first()[0]);
});

 

function copyToClipboard(elem) {
	  // create hidden text element, if it doesn't already exist
    var targetId = "_hiddenCopyText_";
    var isInput = elem.tagName === "INPUT" || elem.tagName === "TEXTAREA";
    var origSelectionStart, origSelectionEnd;
    if (isInput) {
        // can just use the original source element for the selection and copy
        target = elem;
        origSelectionStart = elem.selectionStart;
        origSelectionEnd = elem.selectionEnd;
    } else {
        // must use a temporary form element for the selection and copy
        target = document.getElementById(targetId);
        if (!target) {
            var target = document.createElement("textarea");
            target.style.position = "absolute";
            target.style.left = "-9999px";
            target.style.top = "0";
            target.id = targetId;
            document.body.appendChild(target);
        }
        target.textContent = elem.textContent;
        target.textContent = target.textContent + " ";
    }

    // select the content
    var currentFocus = document.activeElement;
    target.focus();
    target.setSelectionRange(0, target.value.length);
    
   /* var r = document.createRange();
    r.selectNode(target);
    var sel = window.getSelection();
    sel.removeAllRanges();
    sel.addRange(r);
    */
    // copy the selection
    var succeed;
    try {
    	  succeed = document.execCommand("copy");
    } catch(e) {
        succeed = false;
    }
    // restore original focus
    if (currentFocus && typeof currentFocus.focus === "function") {
        currentFocus.focus();
    }
    
    if (isInput) {
        // restore prior selection
        elem.setSelectionRange(origSelectionStart, origSelectionEnd);
    } else {
        // clear temporary content
        target.textContent = "";
    }
    return succeed;
}