JQuery Change Background Color of Dropdown List Element Based on Title

Answer 1

Based on your other post that got deleted, I think this is what you're after:

$(document).ready(function () {
    $('#e1').select2();
    $('#e2').select2().on('change', function(){
        $(this).next().find('.select2-selection').css({
            backgroundColor: this.value
        });
    }).trigger('change');
});

Just listen for the change event and update the CSS then.

Here's an updated fiddle from your other post: https://jsfiddle.net/jmarikle/ea7q41k7/