Making the Divi Header Shrink Further Down the Page
Here's how to delay changing to the Divi fixed header until your users have scrolled down the page a bit.
The Divi Theme's header shrinks to a more compact view as you start to scroll down the screen. Geno asked a question over on the Divi users group about whether it was possible to change the header shrinking effect to happen further down the page – e.g. a user would have to scroll down 500px before the header shrinks. Here's how to do it.
Shrink Header Further Down – Updated
This is an new version of my original code, updated to work with the latest version of Divi (3.0.39 at the time of writing).
Here is the jQuery code to make the header stay large, until the user has scrolled down by a certain number of pixels. In the code below this "offset" is set to 500 pixels, but you can easily change that to your desired scroll down amount.
Divi Booster includes an option to enable this functionality, with the updated code being available in v2.4.1 onwards.
The feature can be found on the Divi Booster settings page at "Header > Main Header > Don't shrink the header until user scrolls down by … px", and can be enabled simply by entering your scroll down amount in pixels, checking the box beside the feature, and saving the settings.
Shrink Header Further Down – The Old Way
This is my original implementation. Due to changes in Divi this no longer works on recent Divi versions. The new version given above is preferable as it works everywhere this one does, as well as on the most recent versions of Divi.
It turns out that Divi uses the jQuery Waypoints plugin to trigger the shrinking effect. Basically the main header is registered as a "waypoint" and when the use scrolls past it a function is triggered which adds (or removes) the CSS class which defines the sticky header layout.
Normally the waypoint triggers when the top of the element is level with the top of the viewing area. However, the waypoint definition accepts an "offset" parameter which allows you to specify that the trigger happens when the top of the element is a certain number of pixels from the top of the viewport. A negative offset will cause the trigger to happen when the element has already scrolled past the top of the viewport by the specified amount.
It was possible to add a custom offset in the Divi Theme's custom.js file which achieved the desired effect. But was it possible to achieve the affect without modifying the theme files – i.e. with something we could place in a child theme?
As far as I can tell, the Waypoint API doesn't offer a way for modifying existing waypoints. The best I could do was to remove all waypoints from the header element (as far as I can tell it's the only waypoint), and create a new waypoint that works in the same way, but uses our custom waypoint.
Here's the jQuery to achieve this (just change the -500 to your required offset in pixels):
To let us set the header to trigger at an exact number of pixels from the top of the page, I've re-attached the new waypoint instead of the main content, and have included an adjustment for when the WordPress admin bar is present (so that it looks the same to both the developer and the users).
The code waits until 1 second after the dom is loaded, to give Divi time to create the waypoint in the first place.
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