使用jQuery仿苹果官网焦点图特效

这次我们要分享的这款jQuery焦点图非常特别，它的外观特别简单，但是又相当大气。焦点图的整体样式是仿苹果样式的，由于jQuery的运用，我们只要点击图片下方的缩略图即可达到图片切换的焦点图特效，这款jQuery焦点图插件非常适合在产片展示的网页上使用。

接下来我们一起分享一下实现这款苹果焦点图的过程及源码。

HTML代码：

<div id="gallery">

    <div id="slides" style="width: 3680px; margin-left: 0px;">

    <div class="slide"><img width="920" height="400" alt="side" src="img/sample_slides/macbook.jpg"></div>

    <div class="slide"><img width="920" height="400" alt="side" src="img/sample_slides/iphone.jpg"></div>

    <div class="slide"><img width="920" height="400" alt="side" src="img/sample_slides/imac.jpg"></div>

    <div class="slide"><a target="_blank" href="http://tutorialzine.com/2009/10/beautiful-apple-gallery-slideshow/"><img width="920" height="400" alt="side" src="img/sample_slides/info.jpg"></a></div>

    </div>

    <div id="menu">

    <ul>

        <li class="fbar inact"> </li><li class="menuItem inact act"><a href=""><img alt="thumbnail" src="img/sample_slides/thumb_macbook.png"></a></li><li class="menuItem inact"><a href=""><img alt="thumbnail" src="img/sample_slides/thumb_iphone.png"></a></li><li class="menuItem inact"><a href=""><img alt="thumbnail" src="img/sample_slides/thumb_imac.png"></a></li><li class="menuItem inact"><a href=""><img alt="thumbnail" src="img/sample_slides/thumb_about.png"></a></li>

    </ul>

    </div>

  </div>

从以上HTML代码可以看出，整个焦点图由一些div构成图片容器，用ul li列表构成下面的缩略图。

CSS代码：

#gallery{

    /* CSS3 Box Shadow */

    -moz-box-shadow:0 0 3px #AAAAAA;

    -webkit-box-shadow:0 0 3px #AAAAAA;

    box-shadow:0 0 3px #AAAAAA;

    /* CSS3 Rounded Corners */

    -moz-border-radius-bottomleft:4px;

    -webkit-border-bottom-left-radius:4px;

    border-bottom-left-radius:4px;

    -moz-border-radius-bottomright:4px;

    -webkit-border-bottom-right-radius:4px;

    border-bottom-right-radius:4px;

    border:1px solid white;

    background:url(img/panel.jpg) repeat-x bottom center #ffffff;

    /* The width of the gallery */

    width:920px;

    overflow:hidden;

}

#slides{

    /* This is the slide area */

    height:400px;

    /* jQuery changes the width later on to the sum of the widths of all the slides. */

    width:920px;

    overflow:hidden;

}

.slide{

    float:left;

}

#menu{

    /* This is the container for the thumbnails */

    height:45px;

}

ul{

    margin:0px;

    padding:0px;

}

li{

    /* Every thumbnail is a li element */

    width:60px;

    display:inline-block;

    list-style:none;

    height:45px;

    overflow:hidden;

}

li.inact:hover{

    /* The inactive state, highlighted on mouse over */

    background:url(img/pic_bg.png) repeat;

}

li.act,li.act:hover{

    /* The active state of the thumb */

    background:url(img/active_bg.png) no-repeat;

}

li.act a{

    cursor:default;

}

.fbar{

    /* The left-most vertical bar, next to the first thumbnail */

    width:2px;

    background:url(img/divider.png) no-repeat right;

}

li a{

    display:block;

    background:url(img/divider.png) no-repeat right;

    height:35px;

    padding-top:10px;

}

a img{

    border:none;

}

CSS代码也非常简单，都是一些简单设置而已。

jQuery代码：

$(document).ready(function(){

    /* This code is executed after the DOM has been completely loaded */

    var totWidth=0;

    var positions = new Array();

    $('#slides .slide').each(function(i){

        /* Traverse through all the slides and store their accumulative widths in totWidth */

        positions[i]= totWidth;

        totWidth += $(this).width();

        /* The positions array contains each slide's commulutative offset from the left part of the container */

        if(!$(this).width())

        {

            alert("Please, fill in width & height for all your images!");

            return false;

        }

    });

    $('#slides').width(totWidth);

    /* Change the cotnainer div's width to the exact width of all the slides combined */

    $('#menu ul li a').click(function(e,keepScroll){

            /* On a thumbnail click */

            $('li.menuItem').removeClass('act').addClass('inact');

            $(this).parent().addClass('act');

            var pos = $(this).parent().prevAll('.menuItem').length;

            $('#slides').stop().animate({marginLeft:-positions[pos]+'px'},450);

            /* Start the sliding animation */

            e.preventDefault();

            /* Prevent the default action of the link */

            // Stopping the auto-advance if an icon has been clicked:

            if(!keepScroll) clearInterval(itvl);

    });

    $('#menu ul li.menuItem:first').addClass('act').siblings().addClass('inact');

    /* On page load, mark the first thumbnail as active */

    /*****

     *

     *    Enabling auto-advance.

     *

     ****/

    var current=1;

    function autoAdvance()

    {

        if(current==-1) return false;

        $('#menu ul li a').eq(current%$('#menu ul li a').length).trigger('click',[true]);    // [true] will be passed as the keepScroll parameter of the click function on line 28

        current++;

    }

    // The number of seconds that the slider will auto-advance in:

    var changeEvery = 10;

    var itvl = setInterval(function(){autoAdvance()},changeEvery*1000);

    /* End of customizations */

});

这是焦点图的重点，完成了图片滑块的动画逻辑，点击缩略图即可切换图片。