Error "ldclient.on('ready')" not firing JavaScript SDK

Affected: JavaScript client-side SDK

Symptoms

The following error occurs when first implementing or updating event handlers:

ldclient.on('ready')

Cause

This happens when calling initialize first, then listening for the ready event after the SDK finished initializing. The ready event is only triggered once, and if you hook the ready event after it’s already been triggered, the callback will never be called because the event won’t occur again.

Solution

Use one of the following approaches:

Move the ready Listener Immediately After initialize

• Place the code that attaches the ready listener immediately after calling the initialize function before the SDK has finished initializing. This ensures that your listener is in place to capture the ready event as soon as it occurs.

Use the waitUntilReady Promise

• Alternatively, you can use the waitUntilReady promise. This promise will resolve if the SDK is ever initialized instead of resolving only once. By using this approach, you can avoid missing the ready event due to timing issues during initialization.