user3574766 user3574766 - 1 month ago 5
Javascript Question

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

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.

$(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>

Answer

You can animate the scroll by getting the top of the 'target element' and then calling animate on the body..

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

modifying it to be something like this will help you achieve what you are after

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

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

complementary fiddle: https://jsfiddle.net/hjugdwbp/