horizontal layout with several content panels

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    Today we want to show you how to create a horizontal layout with several content panels. The idea is to make each panel individually scrollable and animate a content panel to the left of the viewport once it’s clicked or selected from the menu. The challenge is to deal with different viewport sizes meaning that we will change the layout if the screen is not wide enough in order to be stacked vertically instead of horizontally.

    We will be using a couple of useful jQuery plugins:

    1. History.js by Benjamin Lupton

    2. jScrollPane by Kelvin Luck

    3. jquery-sparkle by Benjamin Lupton

    4. jquery.easing

    5. jquery.smartresize by Louis Remi

    THE MARKUP

    The HTML will be built up of a menu that will be fixed at the left side and a container with all the individual panels inside. All will be wrapped by a main container:

    The menu will have the following structure: Go to the top We’ll have a headline and a navigation. We’ve also added a loose helper link that we’ll need to show for smaller screens where we will stack the content vertically. The content will have the following structure:

    Introduction

    ...

    Chapter I.

    Variation Under Domestication

    Causes of Variability

    ...

    The first wrapper with the class hs-content-scroller will act like a mask, having the width and height that is visible in the viewport. This will be the division that we’ll scroll horizontally because the second wrapper with the class hs-content-wrapper will be as wide as the sum of all article widths.

    As you can see, each article will get an ID which we link to in our navigation.

    Let’s style this thing.

    THE CSS

    So, our main aim is to fix the sidebar at the left side of the screen and place the content as a horizontal stack.
    Let’s first style the body and some headings. We’ll set both, overflow-x and overflow-y to hidden. We use the separate properties instead of the single “overflow” because we want to adjust something in a media query later, but we’ll get back to that.

    We’ll first import the normalize.css, a really nice and sensible alternative to the common resets:

    @import url('normalize.css');
     
    body{
        font-family: Baskerville, "Hoefler Text", Garamond, "Times New Roman", serif;
        background: #e9f0f5 url(../images/pattern.png) repeat top left;
        font-weight: 400;
        font-size: 12px;
        color: #333;
        overflow-y: hidden;
        overflow-x: hidden;
    }
    Next, let’s define some general text styles:
    h1, h3, h4{
        font-weight: 400;
    }
    h1{
        font-style: italic;
        border-bottom: 1px solid rgba(126, 126, 126, 0.3);
        padding: 35px 15px 15px 15px;
        margin: 0px 20px 20px 20px;
        position: relative;
        font-size: 38px;
    }
    h2{
        font-size: 40px;
        padding-bottom: 15px;
        border-bottom: 5px solid rgba(190, 211, 226, 0.2);
        color: #a9becd;
        text-shadow: 0px 1px 1px rgba(255, 255, 255, 0.4);
        box-shadow: 0px 1px 0px 0px rgba(255, 255, 255, 0.4);
        font-weight: 700;
    }
    h3{
        font-style: italic;
        font-size: 26px;
        color: #585959;
        text-shadow: 1px 0px 1px rgba(255, 255, 255, 0.4);
    }
    h4{
        text-transform: uppercase;
        letter-spacing: 5px;
        line-height: 20px;
        padding: 10px 0px;
        color: #626a6f;
        border-bottom: 1px solid rgba(126, 126, 126, 0.1);
        box-shadow: 0px 1px 0px 0px rgba(255, 255, 255, 0.4);
    }
    a{
        color: #308fd9;
        text-decoration: none;
        text-transform: uppercase;
        letter-spacing: 2px;
    }
    a:hover{
        color: #87b6da;
    }
    .hs-headline{
        text-align: center;
    }
    .hs-author{
        text-transform: uppercase;
        display: block;
        letter-spacing: 2px;
        font-weight: 700;
        padding: 20px 10px;
    }
    Now, let’s position the menu:
    .hs-menu{
        position: fixed;
        z-index: 100;
        color: #f8f8f8;
        background: #131313;
        width: 200px;
        left: 0px;
        top: 0px;
        height: 100%;
    }
    Setting its position to fixed, we’ll stick the sidebar to the left side of the screen.
    The navigation will have the following style:
    .hs-menu nav{
        position: absolute;
        top: 250px;
        left: 0px;
        right: 0px;
        bottom: 50px;
    }
    The position of the navigation will be absolute and by setting a top and bottom value, we have a flexible height. Later, we will add custom scrolling to the navigation so that we don’t have to worry about the menu items fitting into the area.
    The anchors will have the following style:
    .hs-menu nav a{
        display: block;
        padding: 10px 20px;
        text-align: center;
        outline: none;
        border-bottom: 1px dashed rgba(126, 126, 126, 0.2);
    }
    .hs-menu nav a:active{
        box-shadow: 7px 0px 17px #000 inset;
    }
    .hs-menu nav a:first-child{
        border-top: 1px dashed rgba(126, 126, 126, 0.2);
    }
    The second span in a navigation anchor will be styled differently:
    .hs-menu nav a span:nth-child(2){
        display: block;
        color: #fff;
        font-style: italic;
        font-weight: 400;
        text-transform: none;
        padding-top: 3px;
    }
    Now, let’s style the content part. As mentioned before, the division with the class .hs-content-scroller will be acting as a mask where any overflow won’t be visible. This is basically the same principle as in sliders. The left will be set to 200 pixel because of the sidebar:
    .hs-content-scroller{
        position: absolute;
        left: 200px;
        right: 0px;
        overflow: hidden;
        height: 100%;
    }
    The next wrapper will have a width which allows all the inner content panels to fit inside of it if stacked horizontally. We’ll set the overflow to hidden, because each of our content panels will have a custom scroll bar.
    .hs-content-wrapper{
        width: 7950px;
        position: absolute;
        height: 100%;
        overflow: hidden;
    }
    Each content panel is going to have a width of 500 pixel and float left. We’ll add a transition for the background when we hover and when we add a active class:
    .hs-content{
        width: 500px;
        overflow-y: scroll;
        height: 100%;
        float: left;
        border-right: 1px dashed rgba(126, 126, 126, 0.2);
        border-left: 1px dashed rgba(255, 255, 255, 0.5);
        background: transparent;
        transition: background 0.3s linear;
    }
    .hs-content:hover, .hs-content-active{
        background: #f1f5f8;
    }
    When we add the custom scrolling to the content panels, we only want them to be visible when we hover over them:
    .hs-content:hover .jspVerticalBar,
    .hs-menu nav:hover .jspVerticalBar{
        opacity: 1;
    }
    The first content panel will be a bit narrower:
    .hs-content:first-child{
        width: 400px;
    }
    Let’s add some padding and style the text elements:
    .hs-inner{
        padding: 30px 20px 10px 30px;
    }
    .hs-inner p{
        font-size: 18px;
        line-height: 24px;
        text-align: justify;
        position: relative;
        padding: 10px 0px;
        text-shadow: 1px 0px 1px rgba(255, 255, 255, 0.8);
    }
    .hs-inner p:first-letter{
        font-size: 28px;
    }
    #introduction .hs-inner p:first-of-type{
        font-size: 24px;
        text-align: left;
        line-height: 36px;
        font-style: italic;
        color: #75838D;
        letter-spacing: 0px;
    }
    Remember that little anchor right after the sidebar? When clicking that anchor, the page will scroll up. We’ll only need this anchor when our screen is not big enough to stack the content panels horizontally but only vertically, so we’ll set it to display: none initially. In a media query we’ll then show it.
    a.hs-totop-link{
        display: none;
        position: fixed;
        z-index: 10000;
        bottom: 0px;
        width: 100%;
        height: 40px;
        line-height: 40px;
        font-size: 14px;
        color: #aaa;
        text-shadow: 1px 1px 1px #fff;
        font-weight: 700;
        cursor: pointer;
        text-transform: uppercase;
        text-align: center;
        background: linear-gradient(top, #ffffff 0%,#f3f3f3 50%,#ededed 51%,#ffffff 100%);
        border-top: 1px solid #cacaca;
    }
    When we reach the size of the iPad, we want to get rid of the hover behavior and show the horizontal scrollbar. This will allow us to “swipe” the content on the iPad:
    /* Media Queries */
    @media screen and (max-width: 1024px) {
        .jspVerticalBar{
            opacity: 1;
        }
        .hs-content-scroller{
            overflow-x: scroll;
        }
        .hs-content:hover{
            background: transparent;
        }
        .hs-content-active:hover {
            background: #f1f5f8;
        }
    }
    At this point, we’ll change the layout in order to be stacked vertically. We have to “reset” all the properties that forced the content to be stacked horizontally. We’ll also show the anchor that will bring us back to the top:
    @media screen and (max-width: 715px) {
        body{
            overflow-x: auto;
            overflow-y: auto;
        }
        a.hs-totop-link{
            display: block;
        }
        .hs-menu{
            position: relative;
            width: 100%;
            height: 460px;
        }
        .hs-menu nav{
            top: 230px;
            bottom: 20px;
        }
        .hs-content-scroller{
            position: relative;
            height: auto;
            left: 0;
        }
        .hs-content-wrapper{
            height: auto;
            width: auto;
            margin-left: 0px;
        }
        .hs-content{
            border: none;
        }
        .hs-content, .hs-content:first-child{
            width: auto;
            float: none;
            overflow-y: auto;
        }
    }

    And that’s all the style! Now, let’s take a look at the JavaScript!

    THE JAVASCRIPT

    First, we will set some variables and cache some elements:

    var $container          = $( '#hs-container' ),
        // the scroll container that wraps the articles
        $scroller           = $container.find( 'div.hs-content-scroller' ),
        $menu               = $container.find( 'aside' ),
        // menu links
        $links              = $menu.find( 'nav > a' ),
        $articles           = $container.find( 'div.hs-content-wrapper > article' ),
        // button to scroll to the top of the page
        // only shown when screen size < 715
        $toTop              = $container.find( 'a.hs-totop-link' ),
        // the browser nhistory object
        History             = window.History,
        // animation options
        animation           = { speed : 800, easing : 'easeInOutExpo' },
        // jScrollPane options
        scrollOptions       = { verticalGutter : 0, hideFocus : true },
    The init function will be the first one to execute:
    init                = function() {
                     
        // initialize the jScrollPane on both the menu and articles
        _initCustomScroll();
        // initialize some events
        _initEvents();
        // sets some css properties 
        _layout();
        // jumps to the respective chapter
        // according to the url
        _goto();
         
    },
    The first step is to create / initialize the jScrollPane (the custom scrollbars) on both the menu and the articles. However, for the articles, we will not do this in case the screen size is smaller than 715px:
    _initCustomScroll   = function() {
         
        // Only add custom scrolling to articles if screen size > 715.
        // If not, the articles will be expanded (vertical layout)
        if( $(window).width() > 715 ) {
         
            $articles.jScrollPane( scrollOptions );
         
        }
        // add custom scrolling to menu
        $menu.children( 'nav' ).jScrollPane( scrollOptions );
     
    },
    We will load the events for the window, the menu links and the articles.
    On window resize, we will need to reinitialize the jScrollPane custom scrollbars, or destroy them in case the screen's size gets smaller than 715px.
    On window statechange, we will jump to the respective state / chapter. We are using History.js by Benjamin Lupton to control the history states when the user navigates through the page:
    $(window).on({
        // when resizing the window we need to reinitialize or destroy the jScrollPanes
        // depending on the screen size
        'smartresize' : function( event ) {
             
            _layout();
             
            $('article.hs-content').each( function() {
                 
                var $article    = $(this),
                    aJSP        = $article.data( 'jsp' );
                 
                if( $(window).width() > 715 ) {
                     
                    ( aJSP === undefined ) ? $article.jScrollPane( scrollOptions ) : aJSP.reinitialise();
                     
                    _initArticleEvents();
                     
                }   
                else {
                     
                    // destroy article's custom scroll if screen size <= 715px
                    if( aJSP !== undefined )
                        aJSP.destroy();
                     
                    $container.off( 'click', 'article.hs-content' );
                     
                }
                 
            });
             
            var nJSP = $menu.children( 'nav' ).data( 'jsp' );
            nJSP.reinitialise();
             
            // jumps to the current chapter
            _goto();
         
        },
        // triggered when the history state changes - jumps to the respective chapter
        'statechange' : function( event ) {
             
            _goto();
         
        }
    });
    When we click on an article or menu link, we will check to which chapter it refers to, and we will change the state of the browser history object. This will trigger the statechange event which in turn will make the page / scrolling division jump to the respective area.
    $links.on( 'click', function( event ) {
                         
        var href        = $(this).attr('href'),
            chapter     = ( href.search(/chapter/) !== -1 ) ? href.substring(8) : 0;
         
        _saveState( chapter );
         
        return false;
     
    });
     
    $container.on( 'click', 'article.hs-content', function( event ) {
                         
        var id          = $(this).attr('id'),
            chapter     = ( id.search(/chapter/) !== -1 ) ? id.substring(7) : 0;
         
        _saveState( chapter );
         
        return false;
     
    });
     
    _saveState          = function( chapter ) {
                     
        // adds a new state to the history object
        // this will trigger the statechange on the window
        if( History.getState().url.queryStringToJSON().chapter !== chapter ) {
                 
            History.pushState( null, null, '?chapter=' + chapter );
         
        }
     
    },
    We will also control the overflow property of the "scroller" (divison with class "hs-content-scroller") according to the screen size.
    _layout             = function() {
     
        var windowWidth = $(window).width();
        switch( true ) {
         
            case ( windowWidth <= 715 ) : $scroller.scrollLeft( 0 ).css( 'overflow', 'visible' ); break;
            case ( windowWidth <= 1024 ): $scroller.css( 'overflow-x', 'scroll' ); break;
            case ( windowWidth > 1024 ) : $scroller.css( 'overflow', 'hidden' ); break;
         
        };
         
    },
    The _goto function triggers the animation for changing the area / chapter on the page. We get the current chapter from the history state URL, and given the respective article we either scroll to the left or top depending on the screen size. Also, if we are in landscape mode, the element scrolling is the div "hs-content-scroller", otherwise it's the BODY element.
    _goto               = function( chapter ) {
                     
        // get the url from history state (e.g. chapter=3) and extract the chapter number
    var chapter     = chapter 				
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