javascript - Bootstrap Carousel - 在不同分辨率下显示的元素数

Question

我想使用 Bootstrap 轮播在不同的屏幕分辨率下显示不同数量的元素。

例如:

1. 我想在屏幕分辨率大于 1000 像素时显示 3 个联系人的详细信息

2. 我想在屏幕分辨率介于 600 像素和 999 像素之间时显示 2 个联系人的详细信息

3. 最后我想在屏幕分辨率小于 600 像素时显示单个联系人的详细信息

提前感谢您的帮助。我已经坚持了几天了..

Answer 1

易于实现适用于 Bootstrap 4 的解决方案。将从“data-”获取元素计数并从 JS 获取断点。

(function ($) {
	function calcStepSize(optionNode) {
		var breakM = 990; 
		var breakS = 768; 
		
		var width = $(window).innerWidth();
		
		if(width < breakS) {
			var key = 's';
		} else if(width < breakM) {
			key = 'm';
		} else {
			key = 'l';
		}
		
		var cnt = 1*optionNode.data("itemcount-"+key);
		
		return cnt > 0? cnt : 1;
	}

	function repartition(container, items, count) {
		container.children().remove();
		
		for(var i = 0; i < items.length; i++) {
			var cBlock = $('<div class="carousel-item" ></div').appendTo(container);
			var cInnerBlock = $('<div class="row"></div>').appendTo(cBlock);
                
			for(var j = 0; j < count; j++) {
				var cIdx = (i + j) % items.length;
				
				cInnerBlock.append($(items.get(cIdx)).clone());
			}
		}
		
		container.children().first().addClass("active");
	}
	
	$('.carousel.multi').each(function(idx, El) {
		var carousel = $(El);
		var container = carousel.find('.carousel-inner');
		
		if(!container.children().first().hasClass('carousel-item')) {
			var items = container.children().clone();

			var lastSize = calcStepSize(carousel);
			repartition(container, items, lastSize);

			$(window).resize(function () {
				var cSize = calcStepSize(carousel);

				if(cSize != lastSize) {
					repartition(container, items, cSize);
					lastSize = cSize;
				}
			}); 
		} else {
			container.children().first().addClass("active");
		}
		
		carousel.carousel({
			interval: false
		});
	});

}(jQuery));

<link href="https://v4-alpha.getbootstrap.com/assets/css/docs.min.css" rel="stylesheet"/>

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js"></script>
<script src="https://cdn.rawgit.com/imsky/holder/master/holder.js"></script>

<div class="container">

<div class="bd-example">

<div id="carousel-example-generic" class="carousel multi slide" data-ride="carousel" data-itemcount-l="4" data-itemcount-m="3" data-itemcount-s="2" autostart="0">
  <ol class="carousel-indicators">
    <li data-target="#carousel-example-generic" data-slide-to="0" class="active"></li>
    <li data-target="#carousel-example-generic" data-slide-to="1"></li>
    <li data-target="#carousel-example-generic" data-slide-to="2"></li>
  </ol>
  <div class="carousel-inner" role="listbox">
  
    <div class="col-xs-6 col-sm-6 col-md-4 col-lg-3">
      <img src="holder.js/250x250/auto/#ccc:#755" class="img-fluid" alt="First slide">
    </div>
    <div class="col-xs-6 col-sm-6 col-md-4 col-lg-3">
      <img src="holder.js/250x250/auto/#7dd:#7dd" class="img-fluid" alt="Second slide">
    </div>
    <div class="col-xs-6 col-sm-6 col-md-4 col-lg-3">
      <img src="holder.js/250x250/auto/#747:#444" class="img-fluid" alt="Third slide">
    </div>
        <div class="col-xs-6 col-sm-6 col-md-4 col-lg-3">
      <img src="holder.js/250x250/auto/#ccc:#755" class="img-fluid" alt="First slide">
    </div>
    <div class="col-xs-6 col-sm-6 col-md-4 col-lg-3">
      <img src="holder.js/250x250/auto/#7dd:#7dd" class="img-fluid" alt="Second slide">
    </div>
    <div class="col-xs-6 col-sm-6 col-md-4 col-lg-3">
      <img src="holder.js/250x250/auto/#747:#444" class="img-fluid" alt="Third slide">
    </div>
 
  </div>
  <a class="left carousel-control" href="#carousel-example-generic" role="button" data-slide="prev">
    <span class="icon-prev" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
    <span class="icon-next" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>
</div>