自動的に要素の数に合わせてナビゲーションを増減させるスクリプト

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Auto-generated Scroll Nav

Heght、Width、それぞれが100％の要素を連続して並べて作られたようなページで表示するナビゲーションが自動的にその要素の数に合わせてアンカーリンクを創りだしてくれるスクリプト

また現在の位置に応じてナビゲーションが変化します

右側にあるアンカーリンクのナビゲーションが、要素の数に合わせて自動的に生成されてナビゲートしてくれるものです。

ポイントは、sectionのtitleのところを元に数字を指定、あとはidにそれぞれ何番目かの目印をつけるだけ

コード

HTML

<nav id="section-menu">
  <ul></ul>
</nav>
<section id="section-one" class="section scroll-item" title="One">
  <div class="inner">
    <h2>Today</h2>
  </div>
</section>
<section id="section-two" class="section scroll-item" title="Two">
  <div class="inner">
    <h2>I</h2>
  </div>
</section>
<section id="section-three" class="section scroll-item" title="Three">
  <div class="inner">
    <h2>ate</h2>
  </div>
</section>
<section id="section-four" class="section scroll-item" title="Four">
  <div class="inner">
    <h2>the</h2>
  </div>
</section>
<section id="section-five" class="section scroll-item" title="Five">
  <div class="inner">
    <h2>world</h2>
  </div>
</section>
<script type="text/javascript" src="script.js"></script>

6番目を追加するのなら次のように追加

<section id="section-six" class="section scroll-item" title="six">
  <div class="inner">
    <h2>world</h2>
  </div>
</section>

あとは同じ要領で増やして行けます

CSS

html, body {
    margin: 0;
    padding: 0;
    min-height: 100%;
    font-family: Helvetica, sans-serif;
    vertical-align: baseline;
}


h2 {
    font-weight: 100;
    font-size: 10em;
    line-height: 1em;
    text-transform: uppercase;
    text-align: center;
    margin: 0;
    padding: 0;
    color: #fff;
}


.inner {
    width: 62.5%;
    margin: 0 auto;
    padding-top: 20%;
}


/* ==========================================================================
   Sections
   ========================================================================== */

.section {
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
    
    height: 400px;
}
#section-one {
    background: #73d2e5;
}
#section-two {
    background: #57b8d9;
}
#section-three {
    background: #3d9ccc;
}
#section-four {
    background: #2680bf;
}
#section-five {
    background: #1262b2;
}


/* ==========================================================================
   Section Navigation
   ========================================================================== */

#section-menu {
    position: fixed;
    top: 50%;
    right: 0;
    z-index: 3000;
    text-transform: uppercase;

    -webkit-transition: all ease 0.1s;
    transition: all ease 0.1s;
}
#section-menu.freeze {
    right: -112px;
}
.touch #section-menu {
    display: none;
}
#section-menu ul {
    margin: 0;
    padding: 0;
    list-style: none;
}
#section-menu li {}
#section-menu a {
    float: right;
    clear: both;

    display: block;
    height: 2em;
    line-height: 2em;
    text-decoration: none;
    padding: 0 8px;
    background: rgba(0,0,0,0.5);
    color: #fff;
    white-space: nowrap;

    -webkit-transition: all ease 0.1s;
    transition: all ease 0.1s;
}
#section-menu.freeze a {
    float: none;
    width: 128px;
}
#section-menu a:hover,
#section-menu a:focus {
    background: rgba(0,0,0,0.75);
    font-size: 1.2em;
}
#section-menu a span {
    display: none;
    font-weight: 700;
    position: relative;
    width: 32px;
    left: -8px;
    text-align: center;
    background: rgba(0,0,0,0.1);
}
#section-menu a.active {
    background: #000;
    font-size: 1.4em;
    font-weight: 700;
}
#section-menu.freeze a span {
    display: inline-block;
}
#section-menu a.active span {
    display: inline-block;
    background: #000;
}
#section-menu a.active span:before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    background: #f80;
}
#section-menu.freeze a.active span:before {
    display: none;
}

デフォルトでの表現が少し、物足りなかったので #section-menu a に width:100px;を追加しました。

追加前

追加後

とりあえず、ガタガタが気になったので揃えました

javascript (jQuery)

jQuery(function($) {

    var html = $('html');
    var viewport = $(window);
    var viewportHeight = viewport.height();


    var scrollMenu = $('#section-menu');
    var timeout = null;

    function menuFreeze() {
        if (timeout !== null) {
            scrollMenu.removeClass('freeze');
            clearTimeout(timeout);
        }
        
        timeout = setTimeout(function() {
            scrollMenu.addClass('freeze');
        }, 2000);
    }
    scrollMenu.mouseover(menuFreeze);


    /* ==========================================================================
       Build the Scroll Menu based on Sections .scroll-item
       ========================================================================== */

    var sectionsHeight = {}, viewportheight, i = 0;
    var scrollItem = $('.scroll-item');
    var bannerHeight;

    function sectionListen() {
        viewportHeight = viewport.height();
        bannerHeight = (viewportHeight);
        $('.section').addClass('resize').css('height', bannerHeight);
        scrollItem.each(function(){
            sectionsHeight[this.title] = $(this).offset().top;
        });
    }
    sectionListen();
    viewport.resize(sectionListen);
    viewport.bind('orientationchange', function() {
        sectionListen();
    });
    
    var count = 0;

    scrollItem.each(function(){
        var anchor = $(this).attr('id');
        var title = $(this).attr('title');
        count ++;
        $('#section-menu ul').append('<li><a id="nav_' + title + '" href="#' + anchor + '"><span>' + count + '</span> ' + title + '</a></li>');
    });
    function menuListen() {
        var pos = $(this).scrollTop();
        pos = pos + viewportHeight * 0.625;
        for(i in sectionsHeight){
            if(sectionsHeight[i] < pos) {
                $('#section-menu a').removeClass('active');
                $('#section-menu a#nav_' + i).addClass('active');;
                var newHash = '#' + $('.scroll-item[title="' + i + '"]').attr('id');
                if(history.pushState) {
                    history.pushState(null, null, newHash);
                } else {
                    location.hash = newHash;
                }
            } else {
                $('#section-menu a#nav_' + i).removeClass('active');
                if (pos < viewportHeight - 72) {
                    history.pushState(null, null, ' ');
                }
            }
        }
    }
    scrollMenu.css('margin-top', scrollMenu.height() / 2 * -1);

    /* ==========================================================================
       Smooth Scroll for Anchor Links and URL refresh
       ========================================================================== */

    scrollMenu.find('a').click(function() {
        var href = $.attr(this, 'href');
        $('html').animate({
            scrollTop: $(href).offset().top
        }, 500, function() {
            window.location.hash = href;
        });
        return false;
    });

    
    /* ==========================================================================
       Fire functions on Scroll Event
       ========================================================================== */
    

    function scrollHandler() {
        menuListen();
        menuFreeze();
    }
    scrollHandler();
    viewport.on('scroll', function() {
        scrollHandler();
//            window.requestAnimationFrame(scrollHandler);
    });
});

それぞれのコードはダブルクリックすると、簡単に全選択になりコピーできます。

コードをファイルでダウンロード

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2014年06月29日 WEB制作系 コード・プラグイン javascriptnavi