角材料表自定义过滤器

Question

I am using mat-table. I know about the build in filter. And the filterPredicate . But filter predicate only accepts filterValue: string . I want to be able to filter the table with slide toggle and show only objects that have for example isActive flag true or isActive flag false. But default filter doesn't offer such functionality. I figured out some workarounds myself but I hope there is a better solution.
1) I can filter the array myself but in that way I need to keep the initial array and pass the filtered array to the table. And I don't like the idea of using two arrays for the same information.
2) I can pass special value to the filter when slide toggle is changed for example &@changedToggle-true and check for that value in the filter predicate and filter only objects with the right isActive flag. But that still doesn't look like good solution to me.
Is there any good way for achieving what I want.

Answer 1

I do not know if I understand your problem, but you can extends standard datasource with something like this:

YourCustomDatasource extends Datasource<YourObject> {
 private objects: Observable<Obj[]>;

  filterCustom() {
   return objects.filter(elem => elem.isActive)
   .map(elem => elem)
   .subscribe(
    err => console.error(err),
  );
}

Answer 2

I am using mat-table. I know about the build in filter. And the filterPredicate . But filter predicate only accepts filterValue: string . I want to be able to filter the table with slide toggle and show only objects that have for example isActive flag true or isActive flag false. But default filter doesn't offer such functionality. I figured out some workarounds myself but I hope there is a better solution.
1) I can filter the array myself but in that way I need to keep the initial array and pass the filtered array to the table. And I don't like the idea of using two arrays for the same information.
2) I can pass special value to the filter when slide toggle is changed for example &@changedToggle-true and check for that value in the filter predicate and filter only objects with the right isActive flag. But that still doesn't look like good solution to me.
Is there any good way for achieving what I want.