There is a JS library for that already. Demo at https://clipboardjs.com/ 
and it's on guthub <https://github.com/zenorocha/clipboard.js.git> as well.

On Friday, June 24, 2016 at 6:03:48 PM UTC-7, Rustem wrote:
>
> Is it time to revisit the issue? Seems to be supported by all major 
> browsers. http://caniuse.com/#feat=clipboard
> Would be nice to have a "copy" button appear on hover over any <code> 
> piece.
>
> On Tuesday, January 6, 2015 at 11:26:22 AM UTC-8, Jeremy Ruston wrote:
>>
>> Hi Andrew
>>
>> I'd also love to have a "copy to clipboard" button. The HTML5 Clipboard 
>> API is proceeding very slowly, with very patchy browser support. There's no 
>> implementation of copy to clipboard that I know of.
>>
>> Right now the best prospect for an implementation is within 
>> TiddlyDesktop, where we can rise above browser limitations.
>>
>> Best wishes
>>
>> Jeremy
>>
>>
>> On Mon, Jan 5, 2015 at 7:05 AM, andrew harrison <[email protected]> 
>> wrote:
>>
>>> Everyone else online is using ZeroClipboard because of security 
>>> restraints but that is a hack in itself and I expect will stop working 
>>> eventually. In addition, it only works online.
>>> The W3C is going to be implementing the Clipboard API for HTML 5 (
>>> http://dev.w3.org/2006/webapi/clipops/clipops.html) but it still 
>>> doesn't seem to work yet. I can't find any working examples online.
>>> The following code is what I have been using in TWC but it only seems to 
>>> work in Internet Explorer but not in Tiddlywiki 5 because Javascript is 
>>> stripped. I could spend time writing a widget for just IE but is it worth 
>>> it?
>>> Can anyone tell me what direction I should go? The alternative is 
>>> painstakingly selecting text and hitting Ctrl + C or right click to copy, 
>>> or in the case of touch screen by long pressing and messing with those 
>>> selector arrows. 3 or more steps vs 1 step. I am trying to aim for 
>>> something that copies to clipboard online, offline, server side, client 
>>> side, mouse, touch screen, and browser independent. Is that to much to wish 
>>> for?
>>>
>>> <a href="javascript:;" title="copy" onclick="
>>> var holdtext = document.createElement('TEXTAREA');
>>> holdtext.innerText='This only seems to work in Internet Explorer';
>>> Copied=holdtext.createTextRange();
>>> Copied.execCommand('Copy');
>>> return false;">Copy</a>
>>>
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>>
>>
>>
>> -- 
>> Jeremy Ruston
>> mailto:[email protected]
>>
>

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