Options in Angular Material - Fixed value functioning correctly, while a dynamically retrieved value is not working

I am looking to implement a mat-option filter that should select all options by default. To achieve this, I initially used

.setValue([1,2,3,4,5,6,7,8])

However, I now need the array to be passed dynamically from an API service.

So, I modified it as follows:

this.listApiService.getListOfEventTypes().subscribe(data => {
      (data as Array<any>).forEach(type => {
        this.allSelectedEventTypes.push(type.Id);
      });
    });

.setValue(this.allSelectedEventTypes);

Even though this approach returns the same array, the filter does not select the default options as expected.

Here is the output when printed in the console:

Hardcoded array:

Array(8) [ 1, 2, 3, 4, 5, 6, 7, 8 ]

Dynamically returned array:

Array []

and when expanded:

[]
0: 1
​1: 2
​2: 3
3: 4
​4: 5
​5: 6
​6: 7
​7: 8
​length: 8

However, despite this, selecting all default multiple selections in the mat option filter is not working as intended.

Answer №1

Remember to always include the .setValue function within the subscription block.

this.apiService.getAvailableEvents().subscribe(response => {
  (response as Array<any>).forEach(event => {
    this.selectedEvents.push(event.Id);
  });
  this.variable.setValue(this.selectedEvents);  //<-----
});

API calls usually take some time to complete, so it is important to wait for the response before running certain functions.

If you place your setValue function outside of the subscription block, it may execute before the API response is received.

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