Encountering an issue with the combination of SockJS and AngularJS: Error message

Currently experimenting with Angularjs and sockjs, utilizing this helpful resource: https://github.com/bendrucker/angular-sockjs

On page load, I aim to transmit data via sockjs, however, encountering an Error: INVALID_STATE_ERR on the client side when attempting the following:

socket.send("test data");

Presumably, this issue arises due to Sockjs not being fully "ready" yet. When encapsulated within a $timeout, functionality is achieved with a sufficient delay. A delay of 1000 works, whereas 100 does not.

$timeout(function() {
  socket.send("test");
}, 1000);

Clearly a workaround, prompting the question of how to detect when sockjs has fully initialized to proceed with the call efficiently.

Answer №1

To ensure your messages are sent safely, it is recommended to utilize the setHandler method and include a callback for 'open'. This method is designed to guarantee that the three SockJS client callbacks (onopen, onclose, onmessage) are executed within a digest cycle. Additionally, this service can be used to create a more intricate service that has various capabilities such as:

  • Creating a queue for messages sent while the socket is closed, and sending them once it reopens
  • Providing a $q promise that resolves when the socket opens

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