What could be causing my callback function to fail when used within a nested function?

I am currently utilizing the callback function in conjunction with Socket.io as shown below:

loadData(callback) {

var client = new SyncClient(this.socket, this.project);
this.client = client; //From my data function

    client.on("connected", () => {
        this.values = client.getData();
        callback(client);
    }
}

However, upon calling my function loadData, I encountered this console message:

Uncaught TypeError: callback is not a function
.

It seems that the callback() is referencing its parent which is the function created inside the client.on instead of the loadData(callback). Could this be the issue or is there something else causing this error?

When I call my loadData() within mounted(), it looks like this:

mounted() {
    this.loadData(this.client)
}

Answer №1

Utilize the data received (res) from the .find callback and forward it to your designated callback function:

socket.on('getSettings', function (data, callback) {

    console.log('Settings have been broadcasted.');

    lmsSettings.find({}, function (err, res) {
        callback(false, res); 
    });
});

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