how to copy text from a div to clipboard

1function (container_id, as_html) {
2        /*
3        isEmpty = function (val) {
4              return (val === undefined || val == null || val.length <= 0) ? true : false;
5          };
6        */
7        as_html = isEmpty(as_html) ? false : true;
8
9        //console.log('copyToClipboard: ' + container_id);
10        var elem = document.getElementById(container_id);
11
12        // create hidden text element, if it doesn't already exist
13        var targetId = "_hiddenCopyText_";
14        var isInput = elem.tagName === "INPUT" || elem.tagName === "TEXTAREA";
15        var origSelectionStart, origSelectionEnd;
16        if (isInput) {
17            // can just use the original source element for the selection and copy
18            target = elem;
19            origSelectionStart = elem.selectionStart;
20            origSelectionEnd = elem.selectionEnd;
21            //console.log ('_is_input = true');
22        } else {
23            // must use a temporary form element for the selection and copy
24            //console.log ('_is_input = false, creating a textarea = ' + targetId);
25            target = document.getElementById(targetId);
26            if (!target) {
27                var target = document.createElement("textarea");
28                target.style.position = "absolute";
29                target.style.left = "-9999px";
30                target.style.top = "0";
31                target.id = targetId;
32                document.body.appendChild(target);
33            }
34
35            var content = $.trim(as_html ? $(elem).html() :  $(elem).text());
36            $(target).text( content);
37            console.log ('text_content', content);
38        }
39        // select the content
40        var currentFocus = document.activeElement;
41        target.focus();
42        target.setSelectionRange(0, content.length);
43
44        // copy the selection
45        var succeed;
46        try {
47            succeed = document.execCommand("copy");
48        } catch (e) {
49            succeed = false;
50        }
51        // restore original focus
52        if (currentFocus && typeof currentFocus.focus === "function") {
53            currentFocus.focus();
54        }
55
56        if (isInput) {
57            // restore prior selection
58            elem.setSelectionRange(origSelectionStart, origSelectionEnd);
59        } else {
60            // clear temporary content
61            $(target).text('');
62        }
63
64        return succeed;
65    }