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        Scrollspy

        Automatically update Bootstrap navigation or list group components based on scroll position to indicate which link is currently active in the viewport.

        How it works

        Scrollspy has a few requirements to function properly:

        • If you’re building our JavaScript from source, it requires util.js .
        • It must be used on a Bootstrap nav component or list group.
        • Scrollspy requires position: relative; on the element you’re spying on, usually the <body>.
        • When spying on elements other than the <body>, be sure to have a height set and overflow-y: scroll; applied.
        • Anchors ( <a>) are required and must point to an element with that id.

        When successfully implemented, your nav or list group will update accordingly, moving the .active class from one item to the next based on their associated targets.

        Example in navbar

        Scroll the area below the navbar and watch the active class change. The dropdown items will be highlighted as well.

        @fat

        Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.

        @mdo

        Veniam marfa mustache skateboard, adipisicing fugiat velit pitchfork beard. Freegan beard aliqua cupidatat mcsweeney's vero. Cupidatat four loko nisi, ea helvetica nulla carles. Tattooed cosby sweater food truck, mcsweeney's quis non freegan vinyl. Lo-fi wes anderson +1 sartorial. Carles non aesthetic exercitation quis gentrify. Brooklyn adipisicing craft beer vice keytar deserunt.

        one

        Occaecat commodo aliqua delectus. Fap craft beer deserunt skateboard ea. Lomo bicycle rights adipisicing banh mi, velit ea sunt next level locavore single-origin coffee in magna veniam. High life id vinyl, echo park consequat quis aliquip banh mi pitchfork. Vero VHS est adipisicing. Consectetur nisi DIY minim messenger bag. Cred ex in, sustainable delectus consectetur fanny pack iphone.

        two

        In incididunt echo park, officia deserunt mcsweeney's proident master cleanse thundercats sapiente veniam. Excepteur VHS elit, proident shoreditch +1 biodiesel laborum craft beer. Single-origin coffee wayfarers irure four loko, cupidatat terry richardson master cleanse. Assumenda you probably haven't heard of them art party fanny pack, tattooed nulla cardigan tempor ad. Proident wolf nesciunt sartorial keffiyeh eu banh mi sustainable. Elit wolf voluptate, lo-fi ea portland before they sold out four loko. Locavore enim nostrud mlkshk brooklyn nesciunt.

        three

        Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure. Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan ullamco consequat.

        Keytar twee blog, culpa messenger bag marfa whatever delectus food truck. Sapiente synth id assumenda. Locavore sed helvetica cliche irony, thundercats you probably haven't heard of them consequat hoodie gluten-free lo-fi fap aliquip. Labore elit placeat before they sold out, terry richardson proident brunch nesciunt quis cosby sweater pariatur keffiyeh ut helvetica artisan. Cardigan craft beer seitan readymade velit. VHS chambray laboris tempor veniam. Anim mollit minim commodo ullamco thundercats.

        <nav id="navbar-example2" class="navbar navbar-light bg-light">
        	<a class="navbar-brand" href="#">Navbar</a>
        	<ul class="nav nav-pills">
        		<li class="nav-item">
        			<a class="nav-link active" href="#fat">@fat</a>
        		</li>
        		<li class="nav-item">
        			<a class="nav-link" href="#mdo">@mdo</a>
        		</li>
        		<li class="nav-item dropdown">
        			<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">Dropdown</a>
        			<div class="dropdown-menu">
        				<a class="dropdown-item" href="#one">one</a>
        				<a class="dropdown-item" href="#two">two</a>
        				<div role="separator" class="dropdown-divider"></div>
        				<a class="dropdown-item" href="#three">three</a>
        			</div>
        		</li>
        	</ul>
        </nav>
        <div data-spy="scroll" data-target="#navbar-example2" data-offset="0" class="scrollspy-example" style="position: relative; height: 200px; margin-top: .5rem; overflow: auto;">
        	<h4 id="fat" style="">@fat</h4>
        	<p>Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table
        		bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure.
        		Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan
        		trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan
        		ullamco consequat.</p>
        	<h4 id="mdo" style="">@mdo</h4>
        	<p>Veniam marfa mustache skateboard, adipisicing fugiat velit pitchfork beard. Freegan beard aliqua cupidatat mcsweeney's
        		vero. Cupidatat four loko nisi, ea helvetica nulla carles. Tattooed cosby sweater food truck, mcsweeney's quis
        		non freegan vinyl. Lo-fi wes anderson +1 sartorial. Carles non aesthetic exercitation quis gentrify. Brooklyn
        		adipisicing craft beer vice keytar deserunt.</p>
        	<h4 id="one" style="">one</h4>
        	<p>Occaecat commodo aliqua delectus. Fap craft beer deserunt skateboard ea. Lomo bicycle rights adipisicing banh mi,
        		velit ea sunt next level locavore single-origin coffee in magna veniam. High life id vinyl, echo park consequat
        		quis aliquip banh mi pitchfork. Vero VHS est adipisicing. Consectetur nisi DIY minim messenger bag. Cred ex in,
        		sustainable delectus consectetur fanny pack iphone.</p>
        	<h4 id="two" style="">two</h4>
        	<p>In incididunt echo park, officia deserunt mcsweeney's proident master cleanse thundercats sapiente veniam. Excepteur
        		VHS elit, proident shoreditch +1 biodiesel laborum craft beer. Single-origin coffee wayfarers irure four loko,
        		cupidatat terry richardson master cleanse. Assumenda you probably haven't heard of them art party fanny pack,
        		tattooed nulla cardigan tempor ad. Proident wolf nesciunt sartorial keffiyeh eu banh mi sustainable. Elit wolf
        		voluptate, lo-fi ea portland before they sold out four loko. Locavore enim nostrud mlkshk brooklyn nesciunt.</p>
        	<h4 id="three" style="">three</h4>
        	<p>Ad leggings keytar, brunch id art party dolor labore. Pitchfork yr enim lo-fi before they sold out qui. Tumblr farm-to-table
        		bicycle rights whatever. Anim keffiyeh carles cardigan. Velit seitan mcsweeney's photo booth 3 wolf moon irure.
        		Cosby sweater lomo jean shorts, williamsburg hoodie minim qui you probably haven't heard of them et cardigan
        		trust fund culpa biodiesel wes anderson aesthetic. Nihil tattooed accusamus, cred irony biodiesel keffiyeh artisan
        		ullamco consequat.</p>
        	<p>Keytar twee blog, culpa messenger bag marfa whatever delectus food truck. Sapiente synth id assumenda. Locavore sed
        		helvetica cliche irony, thundercats you probably haven't heard of them consequat hoodie gluten-free lo-fi fap
        		aliquip. Labore elit placeat before they sold out, terry richardson proident brunch nesciunt quis cosby sweater
        		pariatur keffiyeh ut helvetica artisan. Cardigan craft beer seitan readymade velit. VHS chambray laboris tempor
        		veniam. Anim mollit minim commodo ullamco thundercats.
        	</p>
        </div>

        Example with nested nav

        Scrollspy also works with nested .navs. If a nested .nav is .active, its parents will also be .active. Scroll the area next to the navbar and watch the active class change.

        Item 1

        Ex consequat commodo adipisicing exercitation aute excepteur occaecat ullamco duis aliqua id magna ullamco eu. Do aute ipsum ipsum ullamco cillum consectetur ut et aute consectetur labore. Fugiat laborum incididunt tempor eu consequat enim dolore proident. Qui laborum do non excepteur nulla magna eiusmod consectetur in. Aliqua et aliqua officia quis et incididunt voluptate non anim reprehenderit adipisicing dolore ut consequat deserunt mollit dolore. Aliquip nulla enim veniam non fugiat id cupidatat nulla elit cupidatat commodo velit ut eiusmod cupidatat elit dolore.

        Item 1-1

        Amet tempor mollit aliquip pariatur excepteur commodo do ea cillum commodo Lorem et occaecat elit qui et. Aliquip labore ex ex esse voluptate occaecat Lorem ullamco deserunt. Aliqua cillum excepteur irure consequat id quis ea. Sit proident ullamco aute magna pariatur nostrud labore. Reprehenderit aliqua commodo eiusmod aliquip est do duis amet proident magna consectetur consequat eu commodo fugiat non quis. Enim aliquip exercitation ullamco adipisicing voluptate excepteur minim exercitation minim minim commodo adipisicing exercitation officia nisi adipisicing. Anim id duis qui consequat labore adipisicing sint dolor elit cillum anim et fugiat.

        Item 2-2

        Cillum nisi deserunt magna eiusmod qui eiusmod velit voluptate pariatur laborum sunt enim. Irure laboris mollit consequat incididunt sint et culpa culpa incididunt adipisicing magna magna occaecat. Nulla ipsum cillum eiusmod sint elit excepteur ea labore enim consectetur in labore anim. Proident ullamco ipsum esse elit ut Lorem eiusmod dolor et eiusmod. Anim occaecat nulla in non consequat eiusmod velit incididunt.

        Item 2

        Quis magna Lorem anim amet ipsum do mollit sit cillum voluptate ex nulla tempor. Laborum consequat non elit enim exercitation cillum aliqua consequat id aliqua. Esse ex consectetur mollit voluptate est in duis laboris ad sit ipsum anim Lorem. Incididunt veniam velit elit elit veniam Lorem aliqua quis ullamco deserunt sit enim elit aliqua esse irure. Laborum nisi sit est tempor laborum mollit labore officia laborum excepteur commodo non commodo dolor excepteur commodo. Ipsum fugiat ex est consectetur ipsum commodo tempor sunt in proident.

        Item 3

        Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat minim proident occaecat excepteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco excepteur.

        Item 3-1

        Deserunt quis elit Lorem eiusmod amet enim enim amet minim Lorem proident nostrud. Ea id dolore anim exercitation aute fugiat labore voluptate cillum do laboris labore. Ex velit exercitation nisi enim labore reprehenderit labore nostrud ut ut. Esse officia sunt duis aliquip ullamco tempor eiusmod deserunt irure nostrud irure. Ullamco proident veniam laboris ea consectetur magna sunt ex exercitation aliquip minim enim culpa occaecat exercitation. Est tempor excepteur aliquip laborum consequat do deserunt laborum esse eiusmod irure proident ipsum esse qui.

        Item 3-2

        Labore sit culpa commodo elit adipisicing sit aliquip elit proident voluptate minim mollit nostrud aute reprehenderit do. Mollit excepteur eu Lorem ipsum anim commodo sint labore Lorem in exercitation velit incididunt. Occaecat consectetur nisi in occaecat proident minim enim sunt reprehenderit exercitation cupidatat et do officia. Aliquip consequat ad labore labore mollit ut amet. Sit pariatur tempor proident in veniam culpa aliqua excepteur elit magna fugiat eiusmod amet officia.

        <div class="row">
        	<div class="col-4">
        		<nav id="navbar-example3" class="navbar navbar-light bg-light flex-column">
        			<a class="navbar-brand" href="#">Navbar</a>
        			<nav class="nav nav-pills flex-column">
        				<a class="nav-link active" href="#item-1">Item 1</a>
        				<nav class="nav nav-pills flex-column">
        					<a class="nav-link ml-3 my-1" href="#item-1-1">Item 1-1</a>
        					<a class="nav-link ml-3 my-1" href="#item-1-2">Item 1-2</a>
        				</nav>
        				<a class="nav-link" href="#item-2">Item 2</a>
        				<a class="nav-link" href="#item-3">Item 3</a>
        				<nav class="nav nav-pills flex-column">
        					<a class="nav-link ml-3 my-1" href="#item-3-1">Item 3-1</a>
        					<a class="nav-link ml-3 my-1" href="#item-3-2">Item 3-2</a>
        				</nav>
        			</nav>
        		</nav>
        	</div>
        	<div class="col-8">
        		<div data-spy="scroll" data-target="#navbar-example3" data-offset="0" class="scrollspy-example-2" style="position: relative; height: 350px; overflow: auto;">
        			<h4 id="item-1" style="">Item 1</h4>
        			<p>Ex consequat commodo adipisicing exercitation aute excepteur occaecat ullamco duis aliqua id magna ullamco
        				eu. Do aute ipsum ipsum ullamco cillum consectetur ut et aute consectetur labore. Fugiat laborum incididunt
        				tempor eu consequat enim dolore proident. Qui laborum do non excepteur nulla magna eiusmod consectetur
        				in. Aliqua et aliqua officia quis et incididunt voluptate non anim reprehenderit adipisicing dolore ut
        				consequat deserunt mollit dolore. Aliquip nulla enim veniam non fugiat id cupidatat nulla elit cupidatat
        				commodo velit ut eiusmod cupidatat elit dolore.</p>
        			<h5 id="item-1-1" style="">Item 1-1</h5>
        			<p>Amet tempor mollit aliquip pariatur excepteur commodo do ea cillum commodo Lorem et occaecat elit qui et.
        				Aliquip labore ex ex esse voluptate occaecat Lorem ullamco deserunt. Aliqua cillum excepteur irure consequat
        				id quis ea. Sit proident ullamco aute magna pariatur nostrud labore. Reprehenderit aliqua commodo eiusmod
        				aliquip est do duis amet proident magna consectetur consequat eu commodo fugiat non quis. Enim aliquip
        				exercitation ullamco adipisicing voluptate excepteur minim exercitation minim minim commodo adipisicing
        				exercitation officia nisi adipisicing. Anim id duis qui consequat labore adipisicing sint dolor elit
        				cillum anim et fugiat.</p>
        			<h5 id="item-1-2" style="">Item 2-2</h5>
        			<p>Cillum nisi deserunt magna eiusmod qui eiusmod velit voluptate pariatur laborum sunt enim. Irure laboris
        				mollit consequat incididunt sint et culpa culpa incididunt adipisicing magna magna occaecat. Nulla ipsum
        				cillum eiusmod sint elit excepteur ea labore enim consectetur in labore anim. Proident ullamco ipsum
        				esse elit ut Lorem eiusmod dolor et eiusmod. Anim occaecat nulla in non consequat eiusmod velit incididunt.</p>
        			<h4 id="item-2" style="">Item 2</h4>
        			<p>Quis magna Lorem anim amet ipsum do mollit sit cillum voluptate ex nulla tempor. Laborum consequat non elit
        				enim exercitation cillum aliqua consequat id aliqua. Esse ex consectetur mollit voluptate est in duis
        				laboris ad sit ipsum anim Lorem. Incididunt veniam velit elit elit veniam Lorem aliqua quis ullamco deserunt
        				sit enim elit aliqua esse irure. Laborum nisi sit est tempor laborum mollit labore officia laborum excepteur
        				commodo non commodo dolor excepteur commodo. Ipsum fugiat ex est consectetur ipsum commodo tempor sunt
        				in proident.</p>
        			<h4 id="item-3" style="">Item 3</h4>
        			<p>Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat
        				minim proident occaecat excepteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit
        				ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco excepteur.</p>
        			<h5 id="item-3-1" style="">Item 3-1</h5>
        			<p>Deserunt quis elit Lorem eiusmod amet enim enim amet minim Lorem proident nostrud. Ea id dolore anim exercitation
        				aute fugiat labore voluptate cillum do laboris labore. Ex velit exercitation nisi enim labore reprehenderit
        				labore nostrud ut ut. Esse officia sunt duis aliquip ullamco tempor eiusmod deserunt irure nostrud irure.
        				Ullamco proident veniam laboris ea consectetur magna sunt ex exercitation aliquip minim enim culpa occaecat
        				exercitation. Est tempor excepteur aliquip laborum consequat do deserunt laborum esse eiusmod irure proident
        				ipsum esse qui.</p>
        			<h5 id="item-3-2" style="">Item 3-2</h5>
        			<p>Labore sit culpa commodo elit adipisicing sit aliquip elit proident voluptate minim mollit nostrud aute reprehenderit
        				do. Mollit excepteur eu Lorem ipsum anim commodo sint labore Lorem in exercitation velit incididunt.
        				Occaecat consectetur nisi in occaecat proident minim enim sunt reprehenderit exercitation cupidatat et
        				do officia. Aliquip consequat ad labore labore mollit ut amet. Sit pariatur tempor proident in veniam
        				culpa aliqua excepteur elit magna fugiat eiusmod amet officia.</p>
        		</div>
        	</div>
        </div>

        Example with list-group

        Scrollspy also works with .list-groups. Scroll the area next to the list group and watch the active class change.

        Item 1

        Ex consequat commodo adipisicing exercitation aute excepteur occaecat ullamco duis aliqua id magna ullamco eu. Do aute ipsum ipsum ullamco cillum consectetur ut et aute consectetur labore. Fugiat laborum incididunt tempor eu consequat enim dolore proident. Qui laborum do non excepteur nulla magna eiusmod consectetur in. Aliqua et aliqua officia quis et incididunt voluptate non anim reprehenderit adipisicing dolore ut consequat deserunt mollit dolore. Aliquip nulla enim veniam non fugiat id cupidatat nulla elit cupidatat commodo velit ut eiusmod cupidatat elit dolore.

        Item 2

        Quis magna Lorem anim amet ipsum do mollit sit cillum voluptate ex nulla tempor. Laborum consequat non elit enim exercitation cillum aliqua consequat id aliqua. Esse ex consectetur mollit voluptate est in duis laboris ad sit ipsum anim Lorem. Incididunt veniam velit elit elit veniam Lorem aliqua quis ullamco deserunt sit enim elit aliqua esse irure. Laborum nisi sit est tempor laborum mollit labore officia laborum excepteur commodo non commodo dolor excepteur commodo. Ipsum fugiat ex est consectetur ipsum commodo tempor sunt in proident.

        Item 3

        Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat minim proident occaecat excepteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco excepteur.

        Item 4

        Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat minim proident occaecat excepteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco excepteur.

        <div class="row">
        	<div class="col-4">
        		<div id="list-example" class="list-group">
        			<a class="list-group-item list-group-item-action active" href="#list-item-1">Item 1</a>
        			<a class="list-group-item list-group-item-action" href="#list-item-2">Item2</a>
        			<a class="list-group-item list-group-item-action" href="#list-item-3">Item 3</a>
        			<a class="list-group-item list-group-item-action" href="#list-item-4">Item 4</a>
        		</div>
        	</div>
        	<div class="col-8">
        		<div data-spy="scroll" data-target="#list-example" data-offset="0" class="scrollspy-example" style="position: relative; height: 200px; margin-top: .5rem; overflow: auto;">
        			<h4 id="list-item-1" style="">Item 1</h4>
        			<p>Ex consequat commodo adipisicing exercitation aute excepteur occaecat ullamco duis aliqua id magna ullamco
        				eu. Do aute ipsum ipsum ullamco cillum consectetur ut et aute consectetur labore. Fugiat laborum incididunt
        				tempor eu consequat enim dolore proident. Qui laborum do non excepteur nulla magna eiusmod consectetur
        				in. Aliqua et aliqua officia quis et incididunt voluptate non anim reprehenderit adipisicing dolore ut
        				consequat deserunt mollit dolore. Aliquip nulla enim veniam non fugiat id cupidatat nulla elit cupidatat
        				commodo velit ut eiusmod cupidatat elit dolore.</p>
        			<h4 id="list-item-2" style="">Item 2</h4>
        			<p>Quis magna Lorem anim amet ipsum do mollit sit cillum voluptate ex nulla tempor. Laborum consequat non elit
        				enim exercitation cillum aliqua consequat id aliqua. Esse ex consectetur mollit voluptate est in duis
        				laboris ad sit ipsum anim Lorem. Incididunt veniam velit elit elit veniam Lorem aliqua quis ullamco deserunt
        				sit enim elit aliqua esse irure. Laborum nisi sit est tempor laborum mollit labore officia laborum excepteur
        				commodo non commodo dolor excepteur commodo. Ipsum fugiat ex est consectetur ipsum commodo tempor sunt
        				in proident.</p>
        			<h4 id="list-item-3" style="">Item 3</h4>
        			<p>Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat
        				minim proident occaecat excepteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit
        				ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco excepteur.</p>
        			<h4 id="list-item-4" style="">Item 4</h4>
        			<p>Quis anim sit do amet fugiat dolor velit sit ea ea do reprehenderit culpa duis. Nostrud aliqua ipsum fugiat
        				minim proident occaecat excepteur aliquip culpa aute tempor reprehenderit. Deserunt tempor mollit elit
        				ex pariatur dolore velit fugiat mollit culpa irure ullamco est ex ullamco excepteur.</p>
        		</div>
        	</div>
        </div>

        Usage

        Via data attributes

        To easily add scrollspy behavior to your topbar navigation, add data-spy="scroll" to the element you want to spy on (most typically this would be the <body>). Then add the data-target attribute with the ID or class of the parent element of any Bootstrap .nav component.

        body {
        	position: relative;
        }
        <body data-spy="scroll" data-target="#navbar-example">
        	...
        	<div id="navbar-example">
        		<ul class="nav nav-tabs" role="tablist">
        		...
        		</ul>
        	</div>
        	...
        </body>

        Via JavaScript

        After adding position: relative; in your CSS, call the scrollspy via JavaScript:

        $('body').scrollspy({ target: '#navbar-example' })

        Resolvable ID targets required

        Navbar links must have resolvable id targets. For example, a <a href="#home">home</a> must correspond to something in the DOM like <div id="home"></div>.

        Non- :visible target elements ignored

        Target elements that are not :visible according to jQuery will be ignored and their corresponding nav items will never be highlighted.

        Methods

        .scrollspy('refresh')

        When using scrollspy in conjunction with adding or removing of elements from the DOM, you’ll need to call the refresh method like so:

        $('[data-spy="scroll"]').each(function () {
        	var $spy = $(this).scrollspy('refresh')
        })

        .scrollspy('dispose')

        Destroys an element’s scrollspy.

        Options

        Options can be passed via data attributes or JavaScript. For data attributes, append the option name to data-, as in data-offset="".

        Name Type Default Description
        offset number 10 Pixels to offset from top when calculating position of scroll.

        Events

        Event Type Description
        activate.bs.scrollspy This event fires on the scroll element whenever a new item becomes activated by the scrollspy.
        $('[data-spy="scroll"]').on('activate.bs.scrollspy', function () {
        	// do something…
        })
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