Ready State

Ready State

Whenever Relay is fulfilling data requirements, it can be useful to know when certain events occur. For example, we might want to record how long it takes for data to be available, or we might want to log errors to the server. These events are available on most Relay APIs via the onReadyStateChange callback.

onReadyStateChange

When Relay fulfills data, the onReadyStateChange callback is called one or more times with an object that describes the current "ready state". This object has the following properties:

• ready: boolean

  This is true when the subset of data required for rendering is ready.

• done: boolean

  This is true when all data requirements are ready for rendering.

• error: ?Error

  This is an instance of Error if there is a failure. O

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