Is there any way to check if DIV span have text?

Is there any way to check if DIV span have text?

I have DIV and span like this:


  1. <div id="mydiv" class="classdiv>
    <span>some text here<span>
    </div>

1) Is there any way to check if there is any text in the span? (fyi....the span does not have any id or class)

2) Is there any way to add this check and check constantly via jquery like every 2 or 3 seconds?