How to make a dropdown readonly using jquery?

Question

I am using the following statement to make it readonly but it is not working.

$(\'#cf_1268591\').attr(\"readonly\", \"readonly\"); 

I don\

Answer 1

It´s work very well

$('#cf_1268591 option:not(:selected)').prop('disabled', true);

With this I can see the options but I can't select it