The snippet for generating a dynamic, fully qualified live preview url
was wrong. It was indicating there were two arguments passed to that
function, when in fact there is only one.
Thoroughly documents the `admin.preview` feature. Previously, this
information was briefly mentioned in two distinct places, within the
collections config and again within the globals config. This led to
discrepancies over time and was inadequate at describing this feature,
such as having a lack of concrete code examples especially as it relates
to _draft preview_. There has also been confusion between this and Live
Preview.
Now, there is a dedicated page at `/admin/preview` which centralizes
this information into a single document. It also specifically documents
how to achieve _draft preview_ and includes code snippets. This way, we
no longer have to rely solely on the [Draft Preview
Example](https://github.com/payloadcms/payload/tree/main/examples/draft-preview)
for this.
Related: #10798
Similar to #10742. Collection and global-level admin options are
currently documented within the "admin > collections" and "admin >
globals" pages, respectively. This makes them hard to find because
users, myself included, intuitively navigate to the collection and
global overview docs to locate this information before realizing it
lives elsewhere. Now, they are rendered within "configuration >
collections" and "configuration > globals" as expected and the old pages
have been removed altogether.
There was a rogue `{/* IMAGE OF LIVE PREVIEW HERE */}` comment being
rendered in the live preview docs. Comments in this format used to be
hidden, but since moving to a new rendering pattern they now appear.
Fixes#9830. Continuation of #9755 and #9746. Instead of automatically
appending TLDs to the `admin.preview` and the `livePreview.url` URLs, we
should instead ensure that `req` is passed through these functions, so
that you can have full control over the format of this URL without
Payload imposing any of its own formatting.
Similar to #9746. When deploying to Vercel, preview deployment URLs are
dynamically generated. This breaks `admin.preview` within those
deployments because there is no mechanism by which we can detect and set
that URL within Payload. Although Vercel provides various environment
variables at our disposal, they provide no concrete identifier for
exactly which URL is being currently previewed (you can access the same
deployment from a number of different URLs).
The fix is to support relative `admin.preview` URLs, that way Payload
can prepend the application's top-level domain dynamically at
render-time in order to create a fully qualified URL. So when you visit
a Vercel preview deployment, for example, that deployment's unique URL
is used as the preview redirect, instead of the application's
root/production domain. Note: this does not fix multi-tenancy
single-domain setups, as those still require a static top-level domain
for each tenant.
When deploying to Vercel, preview deployment URLs are dynamically
generated. This breaks Live Preview within those deployments because
there is no mechanism by which we can detect and set that URL within
Payload. Although Vercel provides various environment variables at our
disposal, they provide no concrete identifier for exactly _which_ URL is
being currently previewed (you an access the same deployment from a
number of different URLs).
The fix is to support _relative_ live preview URLs, that way Payload can
prepend the application's top-level domain dynamically at render-time in
order to create a fully qualified URL. So when you visit a Vercel
preview deployment, for example, that deployment's unique URL is used to
load the iframe of the preview window, instead of the application's
root/production domain. Note: this does not fix multi-tenancy
single-domain setups, as those still require a static top-level domain
for each tenant.
