Question

is there a way to do: if options have class 1 and 2 then add class A in jQuery?

So this :

<select class="rubrique" name="ctl00">
            <option class="" value="" selected="selected"></option>
            <option class="1" value="1">1</option>
            <option class="2" value="2">2</option>
           </select>

would give me that:

 <select class="rubrique" name="ctl00">
            <option class="" value="" selected="selected"></option>
            <option class="1 A" value="1">1</option>
            <option class="2 A" value="2">2</option>
           </select>

Answer 1

If you want both class 1 and class 2 to be present:

$('.rubrique > .1.2').addClass('A');

You can chain the class-selector . and class-names to find elements with both.

Otherwise, as noted, if you want to add class A to both:

$('.rubrique > .1, .rubrique > .2').addClass('A');

Is what’s needed.

With thanks @T.J. Crowder for pointing out my original mis-reading of the question example.