feat: support dynamic options loading on filtering (#212)

Author: JounQin

.changeset/breezy-weeks-collect.md

@@ -0,0 +1,5 @@
+---
+"@alauda/ui": patch
+---
+
+feat: support dynamic options loading on filtering

src/select/base-select.ts

@@ -20,6 +20,7 @@ import {
   refCount,
   startWith,
   switchMap,
+  takeUntil,
 } from 'rxjs/operators';
 
 import { CommonFormControl } from '../form/public-api';
@@ -239,6 +240,15 @@ export abstract class BaseSelect<T, V = T>
       refCount(),
     );
 
+    // support dynamic options loading on filtering
+    this.allOptions$.pipe(takeUntil(this.destroy$$)).subscribe(() => {
+      if (this.opened) {
+        requestAnimationFrame(() => {
+          this.autoFocusFirstOption();
+        });
+      }
+    });
+
     this.hasMatchedOption$ = combineLatest([
       this.allOptions$.pipe(
         map(customOptions =>