Unable to retrieve data list in Angular TypeScript

After sending a request to the server and receiving a list of data, I encountered an issue where the data appears to be empty when trying to use it in another function within the same file.

The code snippet below initializes an array named tree:

tree:any[]=[];

intialDataa(): any {
    this.claimsManagerService.getAll(this.searchParam).subscribe(data => {
        this.tree = data['records'];
        })
}

However, when attempting to access this data in a different function:

    openAdd(id, par, title, nodel): void {
    console.log(this.tree)
    }

The console output shows an empty array [].

Further investigation revealed that during the IntialData() function, the tree array contains the following data:

  (74) [{…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}, {…}]
length: 0
__proto__: Array(0)

What could be causing this issue and how can I successfully access the tree data?

Edit: Full Code:

    intialDataa(): any {
    // Code for initializing data...
    this.loading = true;
    // More code for retrieving and processing data...
    this.tree = ddata;
}

Here is the second function:

    openAdd(id, par, title, nodel): void {
    // Code for opening and handling data...
}

HTMl Code :

    // HTML code for displaying data...
javascriptangulartypescript

Answer №1

this.tree variable is set asynchronously. This means that when you attempt to access it in the openAdd() function, it may not have a value yet. To solve this issue quickly, consider moving the call to set this.tree directly inside the openAdd() function.

openAdd(id, par, title, nodel): void {
  this.claimsManagerService.getAll(this.searchParam).subscribe(data => {
    this.tree = data['records'];
    console.log(this.tree);
  });
}

An alternative approach to enhance the implementation involves using multicast observables like RxJS BehaviorSubject. However, further information about how the functions are triggered would be helpful.

Answer №2

https://i.sstatic.net/q4qZv.jpg

It appears that you have restructured the assignment for this.tree = ddata

Please eliminate the line this.tree = ddata and test it again...

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