Find if a textbox is currently selected

Question

How would I find if a textbox (or textarea) currently is in focus? I don\'t care to know which one it is, I just need to know if one is in focus (has the cursor in it). How

Answer 1

Extending the accepted answer by a check for editable HTMLDivElements:

if (document.activeElement.nodeName == 'TEXTAREA'
    || document.activeElement.nodeName == 'INPUT'
    || (document.activeElement.nodeName == 'DIV'
        && document.activeElement.isContentEditable)) {
    // …
}