Select the first span element which is not empty

From a group of span elements, I want to get the values of the first o开发者_高级运维ccurrence of a span that is not empty.

I have this HTML

<span class="map_multi_latitude"></span>
<span class="map_multi_longitude"></span>
<span class="map_multi_latitude">30.201998</span>
<span class="map_multi_longitude">120.990876</span>

I have this Jquery before but I want to make it work such that "the first span whose text is not empty":

initialLat = $('span.map_multi_latitude:first').text();
initialLng = $('span.map_multi_longitude:first').text();

thanks in advance!

---

This will work:

$('span:not(:empty):first').text()

or these:

$('span:not(:empty):eq(0)').text()
$('span:not(:empty)').eq(0).text()
$('span:not(:empty)').slice(0,1).text()
$('span:not(:empty)').first().text()

---

initialLat = $('span.map_multi_latitude:not(:empty):first').text();
initialLng = $('span.map_multi_longitude:not(:empty):first').text();

---

var firstMapMultiLatitude;
$('.map_multi_latitude').each(function (index, element) {
    if ($(element).val() != '') {
        firstMapMultiLatitude = $(element).val();
        alert($(element).val());
        return;
    }
});