.dnkl_option()

This jQuery plugin hide or show an option item in a select list.

jQuery.fn.dnkl_option = function(optionSettings) {
    /*
    PLUGIN:	dnkl_option([visible, value, text])
    VERS:	2.0
    DESC:	Hide/show option item in a select list
    USAGE:	$('#mySelectID').dnkl_option({ visible: false, value: '1' });
    */
    var settings = $.extend({ visible: false, value: '', text: '' }, optionSettings || {});
    if (settings.value == '' && settings.text == '') {
        return $(this);
    }
    var os = $(this).data('options');
    if (typeof (os) === 'undefined') {
        $(this).data('options', $('#' + $(this).attr('id') + ' option'));
        os = $(this).data('options');
    }
    var o = null; var index = null;
    for (var i = 0; o == null && i < $(os).length; i++) {
        if ($(os[i]).val() == settings.value || $(os[i]).text() == settings.text) {
            index = i;
            o = os[index];
        }
    }
    if (settings.visible) {
        var id = '#' + $(this).attr('id');
        var visibleOptions = $(id + ' option');
        $(id + ' >option').remove();
        for (var i = 0; i < $(os).length; i++) {
            var o = os[i];
            if (index != null && index == i) {
                $(this).append(o);
            }
            else {
                for (var j = 0; j < visibleOptions.length; j++) {
                    if ($(o).val() == $(visibleOptions[j]).val()) {
                        $(this).append(o);
                    }
                }
            }
        }
        $(id + ' option').first().prop('selected', true);
    }
    else {
        if ($(o).length) {
            $(o).remove();
        }
    }
    return $(this);
}