使用jQuery仿苹果官网焦点图特效(2)


$(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。

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