CODEWITHSUNDEEP
javascripttizen-web-apptizen-wearable-sdk
EyeQ Tech
EyeQ Tech

Reputation: 7378

javascript, yet another TypeError: 'undefined' is not a function

I'm developing a web application (precisely it's a Tizen web application), I got that 'undefined' error although I already defined the callback function serviceConnectionCallback.

I'm new to javascript programming, hope you guys can help. Tks

Below is my code: 

var serviceConnectionCallback = {
        onconnect : onconnectFromPhone ,
        onrequest : onRequest, 
        onerror : onerror
}

window.onload = function() {

    //do something...
    document.addEventListener("visibilitychange", pageVisibilityHandler, false);

};


function pageVisibilityHandler() {
  if (document.hidden) {
    console.log("hidden");
    /*!!!!!!!!!!!!! PROBLEM HERE !!!!!!!!!!!!!!!!!!!!!!!!*/
    webapis.sa.setServiceConnectionListener(serviceConnectionCallback);
  } else {
    console.log("visible");
  }
}

Upvotes: 0

Views: 546

Answers (1)

CodeMonkey
CodeMonkey

Reputation: 1426

When are you calling pageVisibilityHandler()? The flow that I am using to reach setServiceConnectionListener is as follows, starting from a connect() method;

1. request an agent: 
       webapis.sa.requestSAAgent(onSuccess, onError);
2. set up the agents in onSuccess: 
       SAAgent = agents[0];
       SAAgent.setPeerAgentFindListener(peerAgentFindCallback); 
       SAAgent.findPeerAgents();
3. set up the listeners:
       SAAgent.setServiceConnectionListener(serviceConnectionCallback);
       SAAgent.requestServiceConnection(peerAgent);

If you are skipping step 2, your local variable SAAgent is never instantiated and you will get an undefined error. SAAgent is a local variable which you should have initialised as null if you followed the guides.

Upvotes: 1

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