How to add a specific class to select2 drop element?

I have select2 customized via css with its general classes and ids.

Now, I’m trying to customize a specific class that will be provided to select2 and then apply in css to it.

My issue: is NOT the select per say but the drop of it ( the div with the class select2-drop ) that is appended to the body, how can i access that one?

I’ve already tried:

$(".element").select2({
   minimumResultsForSearch: -1,
   containerCssClass : "error"
  }
);

but the class error is not inherited to that div.

UPDATE: This is the graphic element i’m talking about ( the options area ):

And this is the code in the inspected where i want to add that specific class, so i can play with it in CSS:

UPDATE: jsfiddle

Answer

You can use dropdownCssClass for adding class to the select2-drop. I read whole plugin to understand what is going on. Finally, I found that option.

 $(".jSelectbox").select2({
     containerCssClass: "error",
     dropdownCssClass: "test"
 });

Update: If it didn’t work, try this (way 2):

$select = $(".jSelectbox").select2({});
$select.data('select2').$container.addClass('error');
$select.data('select2').$dropdown.addClass('test');

$(".jSelectbox").select2({
  containerCssClass: "error",
  dropdownCssClass: "test"
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.2/select2.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.2/select2.js"></script>
<select class="jSelectbox">
            <option value="AL">Alabama</option>
            <option value="AK">Alaska</option>
            <option value="AZ">Arizona</option>
            <option value="AR">Arkansas</option>
            <option value="CA">California</option>
            <option value="CO">Colorado</option>
            <option value="CT">Connecticut</option>
            <option value="DE">Delaware</option>
            <option value="FL">Florida</option>
            <option value="GA">Georgia</option>
            <option value="HI">Hawaii</option>                   
            <option value="ID">Idaho</option>
            <option value="IL">Illinois</option>
            <option value="IN">Indiana</option>
            <option value="IA">Iowa</option>
            <option value="KS">Kansas</option>
            <option value="KY">Kentucky</option>
            <option value="LA">Louisiana</option>
            <option value="ME">Maine</option>
            <option value="MD">Maryland</option>
            <option value="MA">Massachusetts</option>
            <option value="MI">Michigan</option>
            <option value="MN">Minnesota</option>
            <option value="MS">Mississippi</option>
            <option value="MO">Missouri</option>
            <option value="MT">Montana</option>
            <option value="NE">Nebraska</option>
            <option value="NV">Nevada</option>
            <option value="NH">New Hampshire</option>
            <option value="NJ">New Jersey</option>
            <option value="NM">New Mexico</option>
            <option value="NY">New York</option>
            <option value="NC" selected="">North Carolina</option>
            <option value="ND">North Dakota</option>
            <option value="OH">Ohio</option>
            <option value="OK">Oklahoma</option>
            <option value="OR">Oregon</option>
            <option value="PA">Pennsylvania</option>
            <option value="RI">Rhode Island</option>
            <option value="SC">South Carolina</option>
            <option value="SD">South Dakota</option>
            <option value="TX">Texas</option>
            <option value="TN">Tennessee</option>
            <option value="UT">Utah</option>
            <option value="VT">Vermont</option>
            <option value="VA">Virginia</option>
            <option value="WA">Washington</option>
            <option value="WV">West Virginia</option>
            <option value="WI">Wisconsin</option>
            <option value="WY">Wyoming</option>
            </select>

Jsfiddle

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Answer