jQuery Carousel。 如何仅显示下一个或上一个元素

Question

I have a jQuery problem, and I've really tried everything I know (i am so newbie at this) so ..

The problem in short is I am doing a simple carousel-like effect. I am using this code.

(The div .showarea is the DIV which needs to be rotated (next/prev) but I want to keep only one div shown at a time.)

This is the html markup.

    <div class="maincarousel">
       <div class="showarea"><a href="#"><img src="img/sampleshow.png" alt="" title="" /></a></div>
       <div class="showarea"><a href="#"><img src="img/sampleshow2.png" alt="" title="" /></a></div>
       <div class="showarea"><a href="#"><img src="img/sampleshow3.png" alt="" title="" /></a></div>
       <a href="#carouselPrev" class="leftarrow" title="Previous"></a>
       <a href="#carouselNext" class="rightarrow" title="Next"></a>
    </div>

This is my jquery attempt

$('.showarea').hide();
$('.showarea:first').fadeIn(500);

$('.maincarousel a').click(function () {

    if ($(this).attr('href') == '#carouselNext') {
        $('.showarea').hide();
        $('.showarea').next('.showarea').fadeIn(500);
    }

    if ($(this).attr('href') == '#carouselPrev') {
        $('.showarea').hide();
        $('.showarea').prev('.showarea').fadeIn(500);
    }

});

Unfortunately, next() and prev() won't display the next element only, but all next elements and same thing for prev(). Any quick workaround..

Can someone help me on this,

Thanks

Answer 1

You could try using .eq(0) to select the first element in the collection given to you by .prev() and .next().

Note that .next() and .prev() , like most jQuery methods, are operating on a collection. So if your selector '.showarea' is selecting multiple elements, then .next() will select the next sibling element for each element selected by '.showarea' , and similarly for .prev() .

---

if ($(this).attr('href') == '#carouselNext') {
    $('.showarea').hide();
    var el = $('.showarea').next('.showarea').eq(0);
    if (el.length) {
        el.fadeIn(500);
    }

}

if ($(this).attr('href') == '#carouselPrev') {
    $('.showarea').hide();
    var el = $('.showarea').prev('.showarea').eq(0);
    if (el.length) {
        el.fadeIn(500);
    }
}

Answer 2

The below will rotate so if you are at the first item pressing back will then show the last item...

Demo here

$('div.showarea').fadeOut(0);
$('div.showarea:first').fadeIn(500);

$('a.leftarrow, a.rightarrow').click( function (ev) {
    //prevent browser jumping to top
    ev.preventDefault();

    //get current visible item
    var $visibleItem = $('div.showarea:visible');

    //get total item count
    var total =  $('div.showarea').length;

    //get index of current visible item
    var index = $visibleItem.prevAll().length;

    //if we click next increment current index, else decrease index
    $(this).attr('href') === '#carouselNext' ? index++ : index--;

    //if we are now past the beginning or end show the last or first item
    if (index === -1){
       index = total-1;
    }
    if (index === total){
       index = 0
    }

    //hide current show item
    $visibleItem.hide();

    //fade in the relevant item
    $('div.showarea:eq(' + index + ')').fadeIn(500);

});