main.js

var copyIdMenuProvider = (function () {
    "use strict";
    return {
        execute: function (actionContext) {
            if (actionContext.hasOwnProperty('workItemId')) {
                var ids = actionContext.workItemId;
            }
            else if (actionContext.hasOwnProperty('workItemIds')) {
                var ids = actionContext.workItemIds.join();
            }
            else if (actionContext.hasOwnProperty('id')) {
                var ids = actionContext.id;
            }

            console.log('found ids: ' + ids);
            this.copyTextToClipboard(ids);
        },
        copyTextToClipboard: function (text) {
            var textArea = document.createElement("textarea");

            //
            // *** This styling is an extra step which is likely not required. ***
            //
            // Why is it here? To ensure:
            // 1. the element is able to have focus and selection.
            // 2. if element was to flash render it has minimal visual impact.
            // 3. less flakyness with selection and copying which **might** occur if
            //    the textarea element is not visible.
            //
            // The likelihood is the element won't even render, not even a flash,
            // so some of these are just precautions. However in IE the element
            // is visible whilst the popup box asking the user for permission for
            // the web page to copy to the clipboard.
            //

            // Place in top-left corner of screen regardless of scroll position.
            textArea.style.position = 'fixed';
            textArea.style.top = 0;
            textArea.style.left = 0;

            // Ensure it has a small width and height. Setting to 1px / 1em
            // doesn't work as this gives a negative w/h on some browsers.
            textArea.style.width = '2em';
            textArea.style.height = '2em';

            // We don't need padding, reducing the size if it does flash render.
            textArea.style.padding = 0;

            // Clean up any borders.
            textArea.style.border = 'none';
            textArea.style.outline = 'none';
            textArea.style.boxShadow = 'none';

            // Avoid flash of white box if rendered for any reason.
            textArea.style.background = 'transparent';


            textArea.value = text;

            document.body.appendChild(textArea);

            textArea.select();

            try {
                var successful = document.execCommand('copy');
                var msg = successful ? 'successful' : 'unsuccessful';
                console.log('Copying text command was ' + msg);
                if (!successful) {
                    this.copyToClipboardFallback(text);
                }
            } catch (err) {
                console.log('Oops, unable to copy');
                this.copyToClipboardFallback(text);
            }

            document.body.removeChild(textArea);
        },
        copyToClipboardFallback: function (text) {
            window.prompt("To Copy: Ctrl+C, Enter", text);
        }
    };
} ());

VSS.register("copyId-work-item-menu", function (context) {
    return copyIdMenuProvider;
});