[英]First slide count doesn't work on clicking next for Bootstrap 4 Carousel
我正在尝试获取幻灯片/总数并使其以某种方式工作。 但是,当我单击next
并返回到原始的第一张幻灯片时,它不显示1/4
但仍然是4/4
。
JSFiddel: https://jsfiddle.net/zorw7yLe/
HTML:
<div class="num"></div>
<a class="next" href="#carouselExampleIndicators" role="button" data-slide="next"> -->>></a>
<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
<div class="carousel-inner">
<div class="carousel-item item active">
<img class="d-block w-100" src="https://via.placeholder.com/500x300" alt="First slide">
<div class="carousel-caption">
<h5>Title of the first image</h5>
<p>Some description of the first image</p>
</div>
</div>
<div class="carousel-item item">
<img class="d-block w-100" src="https://via.placeholder.com/500x300" alt="Second slide">
<div class="carousel-caption">
<h5>Title of the second image</h5>
<p>Some description for the second image</p>
</div>
</div>
<div class="carousel-item item">
<img class="d-block w-100" src="https://via.placeholder.com/500x300" alt="Third slide">
<div class="carousel-caption">
<h5>Title of the third image</h5>
<p>Some description for the third image</p>
</div>
</div>
<div class="carousel-item item">
<img class="d-block w-100" src="https://via.placeholder.com/500x300" alt="Fourth slide">
<div class="carousel-caption">
<h5>Title of the fourth image</h5>
<p>Some description for the fourth image</p>
</div>
</div>
</div>
</div>
JS:
var totalItems = $('.carousel-item').length;
var currentIndex = $('.carousel-item.active').index() + 1;
var down_index;
$('.num').html(''+currentIndex+'/'+totalItems+'');
$(".next").click(function(){
currentIndex_active = $('.carousel-item.active').index() + 2;
if (totalItems >= currentIndex_active)
{
down_index= $('.carousel-item.active').index() + 2;
$('.num').html(''+currentIndex_active+'/'+totalItems+'');
}
});
我建议你使用引导轮播事件,你不需要直接在你的链接上观看点击:
https://getbootstrap.com/docs/4.0/components/carousel/#events
var totalItems = $('.carousel-item').length;
$('#carouselExampleIndicators').on('slide.bs.carousel', function (e) {
$('.num').html((e.to+1)+'/'+totalItems);
});
所以你的计数器会跟踪当前的幻灯片
此外,由于您的情况(totalItems >= currentIndex_active),您的计数器不会回到 1/4,在最后一张幻灯片上,如果您在索引上添加 +2,即 5,高于 totalItems (4)
您需要 else 才能最终获得正确的数字,但只需使用引导事件
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