Location Data from Props
Sometimes it can be helpful to know exactly what your app’s browser URL is at any given stage. Because Gatsby uses @reach/router for client-side routing, the
location prop is passed to any page component and represents where the app is currently, where you’d like it to go, and other helpful information. The
location object is never mutated but
reach@router makes it helpful to determine when navigation happens. Here is a sample
Note that you have to parse the
search field (the query string) into individual keys and values yourself.
location object’s properties generally do not include the domain of your site, since Gatsby doesn’t know where you will deploy it.
Running client side is the exception to this rule. In this case, all the information your browser exposes as
window.location is available. This includes
href for the absolute URL of the page, including the domain.
Sometimes you need the absolute URL of the current page (including the host name) while using server-side rendering. For example, you may want to add a canonical URL to the page header.
In this case, you would first need to add configuration that describes where your site is deployed. You can add this as a
siteURL property on
Once you have added
siteURL, you can form the absolute URL of the current page by retrieving
siteURL and concatenating it with the current path from
location. Note that the path starts with a slash;
siteURL must therefore not end in one.
Through client-side routing in Gatsby you can provide a location object instead of strings, which are helpful in a number of situations:
- Providing state to linked components
- Client-only routes
- Fetching data
- Animation transitions
Then from the receiving component you can conditionally render markup based on the