Clipboard in JavaScript

clipboard.js

Clipboard = {}; 
Clipboard.utilities = {}; 

Clipboard.utilities.createTextArea = function(value) { 
    var txt = document.createElement('textarea'); 
    txt.style.position = "absolute"; 
    txt.style.left = "-100%"; 

    if (value != null) 
        txt.value = value; 

    document.body.appendChild(txt); 
    return txt; 
}; 

Clipboard.copy = function(data) { 
    if (data == null) return; 

    var txt = Clipboard.utilities.createTextArea(data); 
    txt.select(); 
    document.execCommand('Copy'); 
    document.body.removeChild(txt); 
};