Menu example

Event delegation with simple css dropdown.

by teresko

HTML

<div class="box">
    <ul class="menu">
        <li>
            <a href="#">item</a>
            <ul>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
            </ul>
        </li>
        <li>
            <a href="#">item</a>
            <ul>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
                <li><a href="#">sub item</a></li>
            </ul>
        </li>
        <li>
            <a href="#">item</a>
        </li>
    </ul>
    
    
    
</div>
<div id="content">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor 
    incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud 
    exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure 
    dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. 
    Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt 
    mollit anim id est laborum.</p>            
</div>

CSS

html, body, ul, li {
    padding: 0;
    margin:    0;
}

html{
    background:        #222;
}

body{
    width:            800px;
    margin:            0 auto;
}    

a{
    outline:        0;
}


div.box{
    margin-top:        100px;
    height:            30px;
    border:            1px solid #bbc;
    list-style:        none outside;                
}

ul.menu{
    float:            left;
    height:            30px;
    border-right:    1px solid #bbc;    
}
ul.menu li{
    float:            left;
    display:        block;
    position:        relative;
}
ul.menu a{
    float:            left;
    display:        block;
    font:            normal 11px Arial, Helvetica, sans-serif;
    height:            13px;
    padding:        9px 20px 8px;    
    color:            #ddd;
    text-decoration:    none;
    background:        #333;
}
ul.menu a:hover{
    background:        #222;
}

ul.menu ul{
    display:        none;
    position:        absolute;
    background:        #333;
    width:            100px;
    float:            none;
    top:            100%;
    left:            -1px;
    border:            1px solid #bbc;    
    border-width:    0 1px 1px;
}
ul.menu li.active ul{
    display:        block;
}

ul.menu ul li{
    float:            none;
    height:            30px;
}
ul.menu ul a{
    float:            none;
}

p{
    padding:        20px 10px 0;
    font:            normal 11px Verdana, Verdana, Geneva, sans-serif;  
    color:            #aaa;
}

JavaScript

(function (){

    var on = (function () {

            var fix = {
                'focus':    'focusin',
                'blur':     'focusout'
            };

            if (window.addEventListener) {
                return function (type, element, callback) {
                    element.addEventListener(type, callback, typeof fix[type] !== undefined);
                };
            }
            return function (type, element, callback) {
                type = fix[type] || type;
                element.attachEvent('on' + type, callback);
            };
        }()),

        handler = function (e) {

            var event = e || window.event, 
                target = e.target || e.srcElement;
                    
            event.cancelBubble = true;
            if (event.stopPropagation) event.stopPropagation();


            if (target.parentNode.parentNode.className === 'menu') {

                toggle(target.parentNode);

            }


            return false;

        },

        toggle = (function () {

            var current = null;

            return function (element) {

                if (current !== null) {
                    current.className = '';
                }
                
                if (current === element) {
                    element.className = '';
                } else {
                    element.className = 'active';
                    current = element;
                }

            };

        }());


    on('click', document, handler);

}());