Retrieving data values in Typescript

Within my code, I have the following lines placed inside an ngOnInit:

this.state.params.subscribe(
      (params: any) => {
        console.log("These are the parameters: " + params['id']);
        if(params['id']){
          console.log("ID confirmed");
          this.data = this.cteDadosService.getCte(params['id']);
          this.data.subscribe(
              cte => {
                this.cte = cte.data[0].CTe[0] || [];
                this.idEmitente = cte.data[0].CTe[0].idEmitente; 
                console.log("CT-e:");
                console.log(this.cte);//show the content of this.cte correctly              
              },
            )
            this.data.subscribe(
              nf => {
                this.nf = nf.data[2].nf || [];
                console.log("NF:");
                console.log(this.nf);//show the content of this.nf correctly
              },
            this.data.subscribe(
              carga =>{
                this.carga = carga.data[1].carga || [];
                console.log("Carga:")
                console.log(this.carga);//show the content of this.carga correctly
              }
            )
            )

          }
        }
      )

In this context, 'this.cte', 'this.nf' and 'this.carga' are defined as private variables initialized with empty arrays.

However, a problem arises when attempting to access these private variables outside of the function "this.state.params.subscribe". For instance:

somefunction()
{
 console.log(this.cte);// displays [] in the console
 console.log(this.nf);// displays [] in the console
 console.log(this.carga);// displays [] in the console
}

If you encounter this issue, one potential solution could be restructuring your code logic or utilizing promises/callbacks to ensure that data is available before proceeding.

Hope this helps!

Answer №1

It is important to invoke this.someFunction() within the subscribe function because they operate asynchronously and retrieve values in an asynchronous manner.

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