Uncaught Invalidstateerror Failed To Execute Send On Websocket Still In Connecting State

If you've encountered the error message "Uncaught InvalidStateError: Failed to execute 'send' on 'WebSocket': Still in CONNECTING state" while working with WebSocket connections, don't worry! This issue is a common one faced by developers when the WebSocket connection is not established or is in the process of connecting.

When you see this error, it means that your script is trying to send data through the WebSocket connection while it's still in the process of establishing a connection. The 'CONNECTING' state indicates that the connection is not open yet, and trying to send data at this stage will result in the "InvalidStateError."

To resolve this error, you need to ensure that the WebSocket connection is fully established and in the 'OPEN' state before trying to send data. You can achieve this by implementing a check in your script to confirm the connection status before sending any messages.

Here's a general approach you can take to handle this error and ensure your WebSocket connection is ready to send data:

1. Check the WebSocket readyState: You can use the `readyState` property of the WebSocket object to determine the current state of the connection. The possible states are:
- 0: CONNECTING
- 1: OPEN
- 2: CLOSING
- 3: CLOSED

2. Implement a condition before sending data: Before calling the `send()` method on the WebSocket object, check if the readyState is 'OPEN.' If it's not in the 'OPEN' state, you should wait for the connection to be fully established.

if (websocket.readyState === WebSocket.OPEN) {
    // Send data here
} else {
    // Wait for the connection to be ready
    websocket.onopen = function(event) {
        // Now the connection is open, you can send data
    };
}

By adding this simple check to your code, you can prevent the "Uncaught InvalidStateError" from occurring and ensure that your WebSocket connection is stable before attempting to send any data.

Remember to handle different WebSocket events like onopen, onmessage, onclose, and onerror appropriately in your script to build a robust WebSocket-based application.

In conclusion, dealing with the "Uncaught InvalidStateError: Failed to execute 'send' on 'WebSocket'" error is all about ensuring that your WebSocket connection is fully established and in the 'OPEN' state before trying to send any data. By implementing the recommended checks and handling WebSocket events effectively, you can avoid this error and build reliable WebSocket applications.