Check values of all fields of a certain class

In jQuery, how do I check the values of all option tags inside of a certain div.class to make sure they are开发者_Python百科 set?

var allSet = true;

$(".myClass select").each(function(i, el){
    if($(":selected", el).length == 0){
        allSet = false;
        return false;
    }
});

if(allSet == false){
    alert("All selects are not set. :(");
} else {
    alert("All selects are set. :)");
}

Assuming the value attributes are set to something:

        <div class="myClass">
            <select>
                <option value="">One</option>
                <option value="2">Two</option>
                <option value="3">Three</option>
            </select>
        </div>

$("div.myClass option[value='']").length === 0;
// => false

And if they're not:

        <div class="myClass">
            <select>
                <option>One</option>
                <option value="2">Two</option>
                <option value="3">Three</option>
            </select>
        </div>

$("div.myClass option[value]").length === 0;
// => false

Of course, those two checks can be combined like so:

0 === $("div.myClass option[value='']").length + 
      $("div.myClass option[value]").length;