Bootstrap accordion, scroll to top of active (open) accordion on click?

user_3574766 0
Viewed 64859

I'm making a responsive site using Bootstrap and it contains accordions with a large amount of text, when you read to the bottom and click the next accordion, the large amount of text is collapsed and I'm left at the bottom of the page.

I found this useful code from Bootstrap accordion scroll to top of active panel heading but it scrolls to the top of all the accordions, not the specific one that is open.

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); 
        }
    }); 
});

How can this code be modified to scroll to the top of the currently active accordion?

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>
twitter-bootstrap accordion jquery javascript
4 Answers

Update 2021

As of Bootstrap 5, jQuery is no longer required. Here is a vanilla JavaScript solution of scrolling to the top of the open accordion item...

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

user_1714560 
$('.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)
  }

When the user clicks the accordion arrow button the following steps take place in the code above :-

1.An accordion variable is set to the parent node with class ".accordion" of the accordion button.

2.accordion[0].scrollHeight - find the scroll height of the accordion that is opened.

3.Using the animate option using scrollTop the page is moved to the scroll height of the accordion.

4.To ensure step 2 & 3 are done after the accordion is open the setTimeout function is used to time the code after the accordion is open. If in your case the accordion body is longer then you might change the value accordingly.Currently its 100 in the above code.

user_154931280
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