morsvox / sticky

jQuery Plugin for Sticky Objects

Sticky

Sticky is a jQuery plugin that gives you the ability to make any element on your page always stay visible.

Sticky in brief

This is how it works:

• When the target element is about to be hidden, the plugin will add the class className to it (and to a wrapper added as its parent), set it to position: fixed and calculate its new top, based on the element's height, the page height and the topSpacing and bottomSpacing options.
• That's it. In some cases you might need to set a fixed width to your element when it is "sticked". But by default (widthFromWrapper == true) sticky updates elements's width to the wrapper's width. Check the example-*.html files for some examples.

Usage

• Include jQuery & Sticky.
• Call Sticky.

<script src="jquery.js"></script>
<script src="jquery.sticky.js"></script>
<script>
  $(document).ready(function(){
    $("#sticker").sticky({topSpacing:0});
  });
</script>

• Edit your css to position the elements (check the examples in example-*.html).

• To unstick an object

<script>
  $("#sticker").unstick();
</script>

Options

• topSpacing: (default: 0) Pixels between the page top and the element's top.
• bottomSpacing: (default: 0) Pixels between the page bottom and the element's bottom.
• className: (default: 'is-sticky') CSS class added to the element's wrapper when "sticked".
• wrapperClassName: (default: 'sticky-wrapper') CSS class added to the wrapper.
• center: (default: false) Boolean determining whether the sticky element should be horizontally centered in the page.
• getWidthFrom: (default: '') Selector of element referenced to set fixed width of "sticky" element.
• widthFromWrapper: (default: true) Boolean determining whether width of the "sticky" element should be updated to match the wrapper's width. Wrapper is a placeholder for "sticky" element while it is fixed (out of static elements flow), and its width depends on the context and CSS rules. Works only as long getWidthForm isn't set.
• responsiveWidth: (default: false) Boolean determining whether widths will be recalculated on window resize (using getWidthfrom).
• zIndex: (default: inherit) controls z-index of the sticked element.

Methods

• sticky(options): Initializer. options is optional.
• sticky('update'): Recalculates the element's position.

Events

• sticky-start: When the element becomes sticky.
• sticky-end: When the element returns to its original location
• sticky-update: When the element is sticked but position must be updated for constraints reasons
• sticky-bottom-reached: When the element reached the bottom space limit
• sticky-bottom-unreached: When the element unreached the bottom space limit

To subscribe to events use jquery:

<script>
  $('#sticker').on('sticky-start', function() { console.log("Started"); });
  $('#sticker').on('sticky-end', function() { console.log("Ended"); });
  $('#sticker').on('sticky-update', function() { console.log("Update"); });
  $('#sticker').on('sticky-bottom-reached', function() { console.log("Bottom reached"); });
  $('#sticker').on('sticky-bottom-unreached', function() { console.log("Bottom unreached"); });
</script>