How to add a specific class to select2 drop element?

Question

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

Answer 1

It will depend on the version of select2 that you are using. The html structure changed in one of the versions.

Here is Fiddle example: https://jsfiddle.net/LpjcqbLu/

I just put the 'error' class on the select box.

.error + .select2-container, 
.error + .select2-container + .select2-container .select2-dropdown {
    border: 3px solid red !important;
}

In earlier versions, the dropdown was not close to the select box (in the dom), so you would have to do a javascript solution to apply the error class directly.