jQuery 如何获取旋转木马的总数和当前幻灯片数
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How to Get total and Current Slide Number of Carousel
提问by Mona Coder
Can you please let me know how I can get the total and current number of the carousel slides in bootstrap like the image below?
您能否让我知道如何获得引导程序中轮播幻灯片的总数和当前数量，如下图所示？
I have an standard Bootstrap carousel and a <div>with the .numclass to display the total and current number and I used this code to retrieve the numbers but it didn't go through
我有一个标准的引导轮播和<div>与.num类显示的总电流的号码，我用这个代码检索数字，但它并没有去通过
$('.num').html(){
$('#myCarousel').carousel({number})
}
Thanks
谢谢
Update:
更新：
Please find a sample at this jsfiddle LINK
请在此 jsfiddle链接中找到示例
回答by Khawer Zeshan
Each slidehas a .itemclass to it, you can get the total number of slides like this
每个slide都有一个.item类，你可以得到这样的幻灯片总数
var totalItems = $('.item').length;
Active slidehas a class named as active, you can get the index of active slidelike this
Activeslide有一个名为 as 的类active，你可以active slide像这样获取索引
var currentIndex = $('div.active').index() + 1;
You can update these values by binding the bootstrap carousel slidevent like this
您可以通过slid像这样绑定引导轮播事件来更新这些值
$('#myCarousel').bind('slid', function() {
currentIndex = $('div.active').index() + 1;
$('.num').html(''+currentIndex+'/'+totalItems+'');
});
回答by IqbalBary
Update of @Khawer Zeshan's code
For Bootstrap 3.0+ use slid.bs.carouselinstead of slidand oninstead of bind. So the update code will be like that
更新@Khawer Zeshan's code
For Bootstrap 3.0+ use slid.bs.carouselinstead of slidand oninstead of bind. 所以更新代码会是这样
var totalItems = $('.item').length;
var currentIndex = $('div.active').index() + 1;
$('#myCarousel').on('slid.bs.carousel', function() {
currentIndex = $('div.active').index() + 1;
$('.num').html(''+currentIndex+'/'+totalItems+'');
});
回答by user3221264
Bootstrap 3.2+:
引导程序 3.2+：
carouselData.getItemIndex(carouselData.$element.find('.item.active'))
回答by Mithun Billara
var totalItemsPop = $('#Mycarousel .item').length;
$('#Mycarousel').on('slide.bs.carousel', function() {
setTimeout(function(){
currentIndexPop = $('#Mycarousel div.active').index() + 1;
$('.num').html('' + currentIndexPop + '/' + totalItemsPop + '');
}, 1000);
});
after slide event, div will be active and can not get active index, so keep your code inside set time out function
滑动事件后，div 将处于活动状态并且无法获得活动索引，因此请将您的代码保留在设置超时功能中
回答by ali alasady
Bootstrap 4 and js
Bootstrap 4 和 js
var totalItems = $('.item').length;
var currentIndex = $('div.item.active').index() + 1;
var down_index;
$('.num').html(''+currentIndex+'/'+totalItems+'');
$(".next").click(function(){
currentIndex_active = $('div.item.active').index() + 2;
if (totalItems >= currentIndex_active)
{
down_index= $('div.item.active').index() + 2;
$('.num').html(''+currentIndex_active+'/'+totalItems+'');
}
});
$(".prev").click(function(){
down_index=down_index-1;
if (down_index >= 1 )
{
$('.num').html(''+down_index+'/'+totalItems+'');
}
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<div class="num"></div>
<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel" data-wrap="false" data-interval="false">
<ol class="carousel-indicators">
<li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
<li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
</ol>
<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>
<div class="carousel-item item">
<img class="d-block w-100" src="https://via.placeholder.com/500x300" alt="Second slide">
</div>
<div class="carousel-item item">
<img class="d-block w-100" src="https://via.placeholder.com/500x300" alt="Third slide">
</div>
</div>
<a class="carousel-control-prev prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
<span class="carousel-control-prev-icon" aria-hidden="true"></span>
<span class="sr-only">Previous</span>
</a>
<a class="carousel-control-next next" href="#carouselExampleIndicators" role="button" data-slide="next">
<span class="carousel-control-next-icon" aria-hidden="true"></span>
<span class="sr-only">Next</span>
</a>
</div>回答by Syed
The only drawback with the below code will be that it doesn't show up till you go to next slide (triggers after each slide change).
下面代码的唯一缺点是它在您转到下一张幻灯片之前不会显示（在每次幻灯片更改后触发）。
JS/jQuery
JS/jQuery
$('#carousel-slide').on('slid.bs.carousel', function () {
var carouselData = $(this).data('bs.carousel');
var currentIndex = carouselData.getActiveIndex();
var total = carouselData.$items.length;
var text = (currentIndex + 1) + " of " + total;
$('#carousel-index').text(text);
});
HTML
HTML
<div id="carousel-index">
<!-- Number will be added through JS over here -->
</div>
回答by M Kaweepatt Churcharoen
You can use jquery index() function to get the current index of active element inside list of item. So the code is look like this:
您可以使用 jquery index() 函数来获取项目列表中活动元素的当前索引。所以代码看起来像这样：
var currentItem = $("#carousel-1 .item.active" );
var currentIndex = $('#carousel-1 .item').index(currentItem) + 1;
