Trying to pull parameters from a LMS Message getting null

Question

I am trying to pull 2 parameters from an LMS message. Currently they are coming in as null at the way I am grabbing them. The publish and subscribe methods work, as I threw console statements to track everything, but I am seeing an error when I try to assign the vars as null from my apex class that uses them..

Publisher JS:

handleClickedMedia(event){
     let selectedIdValue = event.currentTarget.getAttribute("data-key");
     this.newMediaId = event.currentTarget.getAttribute("data-key");
     const message = {
          mediaId: selectedIdValue, mediaList:this.mediaList
     };
     publish(this.messageContext, navigationMessageChannel, message);
     publish(this.dataMessageContext, dataMessageChannel, message);
}

Handler JS:

subscription = null;
  @wire(messageContext)
  messageContext;
  subscribeToMessageChannel(){
        if(!this.subscription){
              this.subscription = subscribe(
                    this.messageContext,
                    dataMessageChannel,
                    (message) => this.handleMessage(message),
                    {scope: APPLICATION_SCOPE}
              );
        }
  }
handleMessage(message){
     this.mediaId = message.mediaId;
     thhis.mediaList = message.mediaList;
}

also tried :

handleMessage(message)(){
         this.mediaId = message.parameters.mediaId;
         thhis.mediaList = message.parameters.mediaList;
    }

Answer 1

I solved the issue, the issue was that the mediaList and mediaID would become null because of the connectedcallback they were in. I moved the function callout to after the assigning of vars and it fixed it.