Scrollspy

Documentation and examples for scrollspy logic with Athena's navigation components.

Contents

How it works

Scrollspy has a few requirements to function properly:

  • It must be used on a nav component.
  • 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 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 sub items will be highlighted as well.

@fat

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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.

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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 .nav component.


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

Via JavaScript

After applying position: relative; to the target element, 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')
})

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 whenever a new item becomes activated by the scrollspy. 

$('#myScrollspy').on('activate.bs.scrollspy', function () {
  // do something…
})