Bootstrap手风琴，点击时滚动到活动（打开）手风琴的顶部？

Question

我正在使用 Bootstrap 制作一个响应式站点，它包含带有大量文本的手风琴，当您阅读到底部并单击下一个手风琴时，大量文本被折叠并且我留在底部页面。

我从Bootstrap accordion scroll to top of active panel heading 找到了这个有用的代码，但它会滚动到所有手风琴的顶部，而不是打开的特定手风琴。

JS

$(function () {
    $('#accordion').on('shown.bs.collapse', function (e) {
        var offset = $('.panel.panel-default > .panel-collapse.in').offset();
        if(offset) {
            $('html,body').animate({
                scrollTop: $('.panel-heading').offset().top -20
            }, 500); 
        }
    }); 
});

如何修改此代码以滚动到当前活动的手风琴顶部？

HTML

<div class="panel-group custom-padding no-sides" id="accordion">                
    <div class="panel panel-default">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapse1">
            <div class="panel-heading custom-padding">
                <h4 class="panel-title text-uppercase">Short synopsis <i class="fa fa-chevron-down pull-right"></i></h4>
            </div>
        </a>
        <div id="collapse1" class="panel-collapse collapse">
            <div class="panel-body">
                <p id="game-deck"></p>
            </div>
        </div>
    </div>                       
    <div class="panel panel-default">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapse2">
            <div class="panel-heading custom-padding">
                <h4 class="panel-title text-uppercase">Concepts <i class="fa fa-chevron-down pull-right"></i></h4>
            </div>
        </a>
        <div id="collapse2" class="panel-collapse collapse">
            <div class="panel-body">
                <ul class="whatever" id="game-concepts"></ul>
            </div>
        </div>
    </div>                      
    <div class="panel panel-default">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapse3">
            <div class="panel-heading custom-padding">
                <h4 class="panel-title text-uppercase">Themes <i class="fa fa-chevron-down pull-right"></i></h4>
            </div>
        </a>    
        <div id="collapse3" class="panel-collapse collapse">
            <div class="panel-body" id="game-themes"></div>
        </div>
    </div>

    <div class="panel panel-default">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapse4">
            <div class="panel-heading custom-padding">
                <h4 class="panel-title text-uppercase">Notable locations<i class="fa fa-chevron-down pull-right"></i></h4>
            </div>
        </a>    
        <div id="collapse4" class="panel-collapse collapse">
            <div class="panel-body" id="game-locations"></div>
        </div>
    </div>

    <div class="panel panel-default">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapse5">
            <div class="panel-heading custom-padding">
                <h4 class="panel-title text-uppercase">Notable characters<i class="fa fa-chevron-down pull-right"></i></h4>
            </div>
        </a>    
        <div id="collapse5" class="panel-collapse collapse">
            <div class="panel-body" id="game-characters"></div>
        </div>
    </div>

    <div class="panel panel-default">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapse6">
            <div class="panel-heading custom-padding">
                <h4 class="panel-title text-uppercase">Full description <i class="fa fa-chevron-down pull-right"></i></h4>
            </div>
        </a>    
        <div id="collapse6" class="panel-collapse collapse">
            <div class="panel-body" id="game-description"></div>
        </div>
    </div>
</div>

Answer 1

您可以通过获取“目标元素”的顶部然后在 body 上调用 animate 来为滚动设置动画..

$('html, body').animate({
    scrollTop: $("#target-element").offset().top
}, 1000);

将其修改为类似的内容将帮助您实现目标

$('.panel-collapse').on('shown.bs.collapse', function (e) {
    var $panel = $(this).closest('.panel');
    $('html,body').animate({
        scrollTop: $panel.offset().top
    }, 500); 
}); 

来源：http://www.abeautifulsite.net/smoothly-scroll-to-an-element-without-a-jquery-plugin-2/

补充小提琴：https://jsfiddle.net/hjugdwbp/

---

编辑：2018-05-25

引导程序 4 示例

使用手风琴示例：https://getbootstrap.com/docs/4.0/components/collapse/#accordion-example 我已经修改了代码以支持卡片。

$('.collapse').on('shown.bs.collapse', function(e) {
  var $card = $(this).closest('.card');
  $('html,body').animate({
    scrollTop: $card.offset().top
  }, 500);
});

小提琴：https://jsfiddle.net/agpkc4v2/1/

---

编辑：2019-07-18

我让它“更漂亮”了……

引导程序 3

https://jsfiddle.net/erutfgvn/

$('.panel-collapse').on('show.bs.collapse', function(e) {
  var $panel = $(this).closest('.panel');
  var $open = $(this).closest('.panel-group').find('.panel-collapse.in');
  
  var additionalOffset = 0;
  if($panel.prevAll().filter($open.closest('.panel')).length !== 0)
  {
        additionalOffset =  $open.height();
  }
  $('html,body').animate({
    scrollTop: $panel.offset().top - additionalOffset
  }, 500);
});

引导程序 4

https://jsfiddle.net/9p7f0hut/

$('.collapse').on('show.bs.collapse', function(e) {
  var $card = $(this).closest('.card');
  var $open = $($(this).data('parent')).find('.collapse.show');
  
  var additionalOffset = 0;
  if($card.prevAll().filter($open.closest('.card')).length !== 0)
  {
        additionalOffset =  $open.height();
  }
  $('html,body').animate({
    scrollTop: $card.offset().top - additionalOffset
  }, 500);
});

---

编辑：2021-04-20

引导程序 5

https://jsfiddle.net/hLzg0n2y/2/

$('.collapse').on('shown.bs.collapse', function(e) {
  var $card = $(this).closest('.accordion-item');
  var $open = $($(this).data('parent')).find('.collapse.show');
  
  var additionalOffset = 0;
  if($card.prevAll().filter($open.closest('.accordion-item')).length !== 0)
  {
        additionalOffset =  $open.height();
  }
  $('html,body').animate({
    scrollTop: $card.offset().top - additionalOffset
  }, 500);
});

Answer 2

我正在开发一个需要相同功能的项目。想出了以下代码。我添加了变量以进行澄清：

$('#accordion').on('shown.bs.collapse', function (e) {

var panelHeadingHeight = $('.panel-heading').height();
var animationSpeed = 500; // animation speed in milliseconds
var currentScrollbarPosition = $(document).scrollTop();
var topOfPanelContent = $(e.target).offset().top;

if ( currentScrollbarPosition >  topOfPanelContent - panelHeadingHeight) {
    $("html, body").animate({ scrollTop: topOfPanelContent - panelHeadingHeight }, animationSpeed);
}});

Answer 3

2021 年更新

从 Bootstrap 5 开始，不再需要 jQuery。这是滚动到打开的手风琴项目顶部的普通 JavaScript 解决方案...

const accordionItems = document.querySelectorAll('.accordion-collapse')
const acc = document.getElementById('accordionExample')

accordionItems.forEach((el)=>{
    el.addEventListener('shown.bs.collapse',(e)=>{
        var scrollOffset = acc.scrollTop + el.parentNode.offsetTop
        acc.scroll({
            top: scrollOffset,
            left: 0, 
            behavior: 'smooth'
        })
    })
})

Demo

Answer 4

$('.accordion-button').on("click",function(event){
    var accordion = $(this).parent().parent().parent();
    window.setTimeout(function(){
      $('body,html').stop().animate({ scrollTop: accordion[0].scrollHeight}, 1000);
    },100)
  }

当用户点击手风琴箭头按钮时，上面的代码会执行以下步骤：-

1.一个手风琴变量被设置为手风琴按钮的类“.accordion”的父节点。

2.accordion[0].scrollHeight - 找到打开的手风琴的滚动高度。

3.使用scrollTop的动画选项将页面移动到手风琴的滚动高度。

4. 为确保在手风琴打开后执行第 2 步和第 3 步，setTimeout 函数用于在手风琴打开后对代码进行计时。如果在你的情况下手风琴体更长，那么你可能会相应地更改值。目前在上面的代码中它是 100。