select2 - Setting different width to input and dropdown

Answer 1

The property you used is not for controlling the dropdown width. You can use the dropdownCssClass property.

Here's a demo in jsFiddle.

JavaScript:

$(document).ready(function() { 
    $("#e1").select2({dropdownCssClass : 'bigdrop'}); 
});

CSS:

.bigdrop {
    width: 600px !important;
}

Please note that for more recent versions there is now a better solution! See Dave Amphlett's answer