How to reset a select element with jQuery

Answer 1

This function should work for all types of select (multiple, select, select2):

$.fn.Reset_List_To_Default_Value = function()
{
    $.each($(this), function(index, el) {
        var Founded = false;

        $(this).find('option').each(function(i, opt) {
            if(opt.defaultSelected){
                opt.selected = true;
                Founded = true;
            }
        });

        if(!Founded)
        {
            if($(this).attr('multiple'))
            {
                $(this).val([]);
            }
            else
            {
                $(this).val("");
            }
        }
        $(this).trigger('change');
    });
}

To use it just call:

$('select').Reset_List_To_Default_Value();