Polyfill to implement the toggle button by hidden radio input

jquery.togglbuttons.js

/**
* Polyfill to implement the toggle button by hidden radio input
* Add "active" class to the buttonized element, for ":checked + el" expression
* @param {Object} options
*/
$.support.toggleButtons = "opacity" in document.createElement("div").style;
$.fn.toggleButtons = function(options){
    var my = {};
    
    if($.support.toggleButtons){
        return this;
    }
    
    my.options = $.extend({
        button: ".button"
    }, options);
    my.key = "toggleButtonInit";
    my.names = [];
    my.onClick = function(e){
        this.prop("checked", true);
        this.trigger("change");
        my.update(this.attr("name"));
    };
    my.update = function(name){
        $("input[name=" + name + "]").each(function(){
            var input, button;
            input = $(this);
            button = input.siblings(my.options.button);
            button.toggleClass("active", input.prop("checked"));
        });
    };
    
    this.each(function(){
        var input, name;

        input = $(this);
        if(input.data(my.key)){
            return;
        }
        input.closest("label").on("click", $.proxy(my.onClick, input));
        input.data(my.key, true);
        name = input.attr("name");
        if($.inArray(name, my.names) < 0){
            my.names.push(name);
        }
    });

    my.names.forEach(function(name){
        my.update(name);
    });
    
    return this;
};

ES5のメソッドをはずしてjQueryの機能を使うようにした。