nak5

The CheckAll plugin for MooTools 1.2 makes it easy to create a “Check All” checkbox on a tabled list of items. This feature is a very simple addition to any system needing to manage multiple items at once.

View the demo:
http://nak5.com/demos/checkall

Usage:
It’s as easy as…

window.addEvent('domready', function(){
    new CheckAll($$('input.checkones'), $('checkall'));
});

The CheckAll class:

var CheckAll = new Class({

    checks: [],
    checkall: null,

    initialize: function(chks, chka){
        this.checks = $$(chks);
        this.checkall = $(chka);
        if (this.checks.length > 0){
            this.checkall.addEvent('click', function(){
                this.checks.each(function(el){
                    el.checked = this.checkall.checked;
                }, this);
            }.bindWithEvent(this));
            this.checks.each(function(el){
                el.addEvent('click', function(){
                    this.checkall.checked = this.checks.every(function(el){
                        return el.checked;
                    });
                }.bindWithEvent(this));
            }, this);
        } else this.checkall.disabled = true;
    }
});