滑动时引导轮播滚动顶部答案

【问题标题】：Bootstrap Carousel scroll top when slide滑动时引导轮播滚动顶部
【发布时间】：2020-07-29 11:04:46
【问题描述】：

我在 BS 模式中有一个 BS 轮播，并且轮播项目中的内容很长（您必须向下滚动）。因此，如果轮播项目发生变化，我希望页面滚动到顶部。

我已经为scrollTop 尝试了不同的 ID 和类，但没有用。

代码

$('#carouselExampleControls').on('slid.bs.carousel', function () {
    $('body').scrollTop(0);
    console.log('slid event');
});

小提琴

https://jsfiddle.net/cdheumann/ajf7vs8m/

$('#carouselExampleControls').on('slid.bs.carousel', function () {
    $("body").scrollTop(0);
    console.log('slid event');
});

.modal-dialog {
    max-width: 90vw;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
    Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
                <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                    <span aria-hidden="true">&times;</span>
                </button>
            </div>
            <div class="modal-body">
                <div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
                    <div class="carousel-inner">
                        <div class="carousel-item active">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="First slide">
                        </div>
                        <div class="carousel-item">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="Second slide">
                        </div>
                        <div class="carousel-item">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="Third slide">
                        </div>
                    </div>
                    <a class="carousel-control-prev" href="#carouselExampleControls" 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="#carouselExampleControls" role="button" data-slide="next">
                        <span class="carousel-control-next-icon" aria-hidden="true"></span>
                        <span class="sr-only">Next</span>
                    </a>
                </div>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary">Save changes</button>
            </div>
        </div>
    </div>
</div>

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>

【问题讨论】：

标签： html css twitter-bootstrap bootstrap-4 bootstrap-carousel

【解决方案1】：

这里不要使用body，而是使用.modal。

$('#carouselExampleControls').on('slid.bs.carousel', function () {
    $('.modal').scrollTop(0);
    console.log('slid event');
});

你想平滑滚动吗？使用 jQuery animate 函数，但不要忘记包含 jQuery 而不是 jQuery slim （包括你在内）。

$('#carouselExampleControls').on('slid.bs.carousel', function () {
    $(".modal").animate({ scrollTop: 0 }, 600);
    console.log('slid event');
});

默认

$('#carouselExampleControls').on('slid.bs.carousel', function () {
    $(".modal").scrollTop(0);
    console.log('slid event');
});

.modal-dialog {
    max-width: 90vw;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
    Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
                <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                    <span aria-hidden="true">&times;</span>
                </button>
            </div>
            <div class="modal-body">
                <div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
                    <div class="carousel-inner">
                        <div class="carousel-item active">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="First slide">
                        </div>
                        <div class="carousel-item">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="Second slide">
                        </div>
                        <div class="carousel-item">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="Third slide">
                        </div>
                    </div>
                    <a class="carousel-control-prev" href="#carouselExampleControls" 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="#carouselExampleControls" role="button" data-slide="next">
                        <span class="carousel-control-next-icon" aria-hidden="true"></span>
                        <span class="sr-only">Next</span>
                    </a>
                </div>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary">Save changes</button>
            </div>
        </div>
    </div>
</div>

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>

滚动动画

$('#carouselExampleControls').on('slid.bs.carousel', function () {
    $(".modal").animate({ scrollTop: 0 }, 600);
    console.log('slid event');
});

.modal-dialog {
    max-width: 90vw;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">

<!-- Button trigger modal -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
    Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
                <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                    <span aria-hidden="true">&times;</span>
                </button>
            </div>
            <div class="modal-body">
                <div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
                    <div class="carousel-inner">
                        <div class="carousel-item active">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="First slide">
                        </div>
                        <div class="carousel-item">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="Second slide">
                        </div>
                        <div class="carousel-item">
                            <img class="d-block w-100" src="https://placeimg.com/640/1000/animals" alt="Third slide">
                        </div>
                    </div>
                    <a class="carousel-control-prev" href="#carouselExampleControls" 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="#carouselExampleControls" role="button" data-slide="next">
                        <span class="carousel-control-next-icon" aria-hidden="true"></span>
                        <span class="sr-only">Next</span>
                    </a>
                </div>
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary">Save changes</button>
            </div>
        </div>
    </div>
</div>

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>

【讨论】：