如何在运行时更改引导转盘间隔？
原文:https://www . geesforgeks . org/how-change-bootstrap-carousel-interval-at-runtime/
我们将学习如何使用 bootstrap 在运行时更改转盘间隔。在这个例子中，我们将讨论多种方法。Bootstrap carousel 是一个幻灯片显示，用于在用 JavaScript、CSS 和动画构建的多个内容中滑动。它可以处理文本、图像和自定义标记。它还包括用于控制其运动的前一个和下一个控制和指示器。
方法 1: 我们可以通过使用每个轮播项目的数据间隔属性来控制动画。给出的例子是理解这个概念的最好例子。默认情况下，数据间隔属性用于设置两个转盘项目之间的间隔时间，其值为 3000 毫秒。
超文本标记语言
<html>
<head>
<!-- CSS only -->
<link href=
"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
rel="stylesheet" />
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
</script>
<title>geeksforgeeks</title>
</head>
<body style="width:70%;">
<div id="carouselExampleIndicators"
class="carousel slide" data-ride="carousel"
data-interval="100">
<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 active">
<img class="d-block w-100" src=
"https://media.geeksforgeeks.org/wp-content/uploads/20190802021607/geeks14.png"
alt="Second slide">
</div>
<div class="carousel-item">
<img class="d-block w-100" src=
"https://media.geeksforgeeks.org/wp-content/cdn-uploads/20210223134821/gfg3.jpg"
alt="First slide">
</div>
<div class="carousel-item" id="image2">
<img class="d-block w-100" src=
"https://media.geeksforgeeks.org/wp-content/cdn-uploads/gfg_200x200-min.png"
alt="Third slide">
</div>
</div>
<a class="carousel-control-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"
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>
</body>
</html>
输出:
方法 2: 在这种方法中，我们将使用 bootstrap API 方法更改动画间隔。它将一个参数作为单位毫秒的间隔(即 1s =毫秒)。我们分配的时间间隔将在运行时改变所有转盘项目之间的动画时间。转盘功能中的数据间隔用于设置两张图像幻灯片之间的时间。
语法
$('.carousel').carousel({
interval: time in millisecond
});
超文本标记语言
<html>
<head>
<!-- CSS only -->
<link href=
"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
rel="stylesheet" />
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
</script>
<title>geeksforgeeks</title>
</head>
<body style="width:70%;">
<div id="carouselExampleIndicators"
class="carousel slide" data-ride="carousel">
<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 active">
<img class="d-block w-100" src=
"https://media.geeksforgeeks.org/wp-content/uploads/20190802021607/geeks14.png"
alt="Second slide">
</div>
<div class="carousel-item">
<img class="d-block w-100" src=
"https://media.geeksforgeeks.org/wp-content/cdn-uploads/20210223134821/gfg3.jpg"
alt="First slide">
</div>
<div class="carousel-item" id="image2">
<img class="d-block w-100" src=
"https://media.geeksforgeeks.org/wp-content/cdn-uploads/gfg_200x200-min.png"
alt="Third slide">
</div>
</div>
<a class="carousel-control-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"
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>
<script>
// Handle Bootstrap carousel slide event
$('.carousel').carousel({
interval: 100
});
</script>
</body>
</html>
输出:
方法 3: 我们可以使用数据属性和 javascript 设置数据间隔。这种方法和上面两种方法一样简单。在这种方法中，我们将选择 carousel 类 div，并使用 attr()方法更改属性。attr()方法是一个 jquery 方法，它设置或返回所选元素的属性和值。当此方法用于返回值时，它返回第一个匹配元素的值，如果它用于设置属性值，则它设置一个或多个属性的属性。
语法:
$('.carousel').attr(
"data-interval","interval that you want to set (in milisec)
");
超文本标记语言
<html>
<head>
<!-- CSS only -->
<link href=
"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
rel="stylesheet" />
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
<script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
</script>
<script src=
"https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
</script>
<title>geeksforgeeks</title>
</head>
<body style="width: 70%;">
<div id="carouselExampleIndicators"
class="carousel slide"
data-ride="carousel">
<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 active">
<img class="d-block w-100"
src=
"https://media.geeksforgeeks.org/wp-content/uploads/20190802021607/geeks14.png"
alt="Second slide" />
</div>
<div class="carousel-item">
<img class="d-block w-100"
src=
"https://yt3.ggpht.com/ytc/AAUvwnjJqZG9PvGfC3GoV27UlohMeBLxyUdhs9hUbc-Agw=s900-c-k-c0x00ffffff-no-rj"
alt="First slide" />
</div>
<div class="carousel-item" id="image2">
<img class="d-block w-100"
src=
"https://media.geeksforgeeks.org/wp-content/cdn-uploads/gfg_200x200-min.png"
alt="Third slide" />
</div>
</div>
<a class="carousel-control-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"
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>
<script>
//handle Bootstrap carousel slide event
$(".carousel").attr("data-interval", "100");
</script>
</body>
</html>
输出
支持的浏览器:
- 谷歌 Chrome
- 微软公司出品的 web 浏览器
- 火狐浏览器
- 歌剧
- 旅行队
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