Why doesn't embedded JavaScript execute when inserted in response to an ajax call?

Question

Inserting JavaScript in the .innerHTML does not cause it to run.

I have what I call a mini-feed in which a user submits a post. This initiates an ajax call which saves

Answer 1

The following code should work:

function onSuccess() {
    src = document.createElement('script');
    src.innerHTML = this.responseText;
    document.body.appendChild(src);
}

But I would agree with cwallenpoole that why not have all that javascript code (for pretty-fying the date) be already written in advanced in the main page? (or script included or something).