Usage
nebula.scrollTo(element, offset, speed, onlyWhenBelow, callback)
Parameters
element
(Required) (Object) The jQuery object of the element to scroll to
Default: None
offset
(Optional) (Integer) Pixel offset of the element
Default: None
speed
(Optional) (Integer) How long the animated scroll should take in milliseconds
Default: 500
onlyWhenBelow
(Optional) (Boolean) Only scroll if the viewport is below the element (with offset)
Default: false
callback
(Optional) (Function) A function to run after the scroll animation has completed
Default: None
Parameter Notes
offset
is automatically subtracted from the element top, so positive numbers are above the element and negative numbers are below it.
Note: if a scroll-padding-top
CSS property is applied to the <body>
element, it will be accounted for as well and added to the offset automatically.
Examples
Scroll to a specific element.
nebula.scrollTo(jQuery('.some-element'));
Scroll to 100px above an element only when the viewport is below that point (triggered on a Bootstrap carousel slide).
jQuery('#example-bootstrap-carousel').on('slide.bs.carousel', function(){ nebula.scrollTo(jQuery('#signup-form'), 500, 100, true); });
Automatically scroll to an element.
<a href="#lower-element">Click here to scroll</a>
Automatically scroll with an offset
<a href="#lower-element" data-offset="200">Click here to scroll</a>
Alternate way to automatically scroll to an element.
<a class="nebula-scrollto" href="#" data-scrollto="#lower-element" data-offset="200">Click here to scroll</a>
Demo
Click here to scroll (via href)
Click here to scroll (via JS method)
Click here to scroll (via class/attribute)
Additional Notes
This function can be called specifically to scroll to an element, but it also runs automatically on any links where the href is an ID that starts with #
(unless the class no-scroll
is added to the element) or when the class nebula-scrollto
is present.
After scrolling, the element will be “focused” on to maintain keyboard navigability. If you’re seeing borders on elements after scrolling, this is what is happening. You can modify your CSS to change this.
It is highly recommended to use scroll-padding-top
in CSS to ensure the browser accounts for the fixed header on the page if used.
Source File
Located in /assets/js/modules/helpers.js on line 265.
No Hooks
This function does not have any filters or actions available. Request one?nebula.scrollTo = function(element, offset = 0, speed = 500, onlyWhenBelow = false, callback){ if ( nebula.dom.html.css('scroll-behavior') !== 'smooth' ){ //If the html has smooth scroll-behavior, use that instead of this. if ( !offset ){ offset = nebula.scroll.offset || 0; //Note: This selector should be the height of the fixed header, or a hard-coded offset. } //Account for the scroll-padding-top CSS property on the body element let scrollPaddingTop = parseInt(nebula.dom.body.css('scroll-padding-top'), 10); //Parse the CSS value as a base-10 integer if ( !isNaN(scrollPaddingTop) ){ offset = offset + scrollPaddingTop; } //Call this function with a jQuery object to trigger scroll to an element (not just a selector string). if ( element ){ if ( typeof element === 'string' ){ element = jQuery.find(element); //Use find here to prevent arbitrary JS execution } else if ( !element.jquery ){ //Check if it is already a jQuery object element = jQuery(element); } if ( element.length ){ let willScroll = true; if ( onlyWhenBelow ){ let elementTop = element.offset().top-offset; let viewportTop = nebula.dom.document.scrollTop(); if ( viewportTop-elementTop <= 0 ){ willScroll = false; } } if ( willScroll ){ if ( !speed ){ speed = nebula.scroll.speed || 500; } jQuery('html, body').animate({ scrollTop: element.offset().top-offset }, speed, function(){ nebula.focusOnElement(element); if ( callback ){ return callback(); } }); } } return false; } } };
Override
To override or disable this JavaScript function, simply redeclare it with the exact same function name.
nebula.scrollTo = function(element, offset, speed, onlyWhenBelow, callback){ //Write your own code here, leave it blank, or return false. }