MDX Embed Intersection Observer
If youāre not familiar with my plugin gatsby-mdx-embed have a read of this post
ā¦ or to summarize..
Gatsby MDX Embed is a Gatsby MDX plugin to embed Twitter, YouTube Instagram and many more in to your .mdx without imports!
Iāve had some great feedback about the plugin but there was always one little problem that iāve been putting off solvingā¦ until now.
The Problem
Well, thereās two problems actually.
The First
Versions 0.0.0 to 0.0.17 worked by wrapping the root element of your Gatsby site with provider āembedā scripts. This
meant that whenever a Tweet or Instagram etc provider component was found on the page the scrips would be available and
the components could invoke the script which in turn renders the component in the page.
The Second
Some provider components donāt require page level scripts, instead they just invoke themselves when the pages loads and download whatever they need in order to render.
In both cases third party scripts need to be downloaded and the problem is that sometimes the component responsible for this isnāt even visible.
This is a quite unnecessary use of bandwidth!
Ideally we only want components to load scripts as we scroll them in to viewā¦ keeping Gatsby blazing fast ā”
The Solution
In a recent post i discussed the Intersection Observer which is a really tidy way to know if a DOM element has entered the viewport or not.
This kind of functionality is perfect for MDX Embed and iām pleased to announce that as of version 0.0.19 all
provider components will lay dormant until they are within the viewport.
As and when they do intersect with the boundaries of the browser window the Intersection Observer kicks in and renders the underlying provider component, which as mentioned above then loads and invokes the provider script.
This improvement will keep you page load speeds fast and your Lighthouse scores high!
Happy embedding!