如何使用Search实现Angular Drop-down

Question

如何进行下拉搜索。我不知道如何在我的下拉列表中实现搜索。希望有人能帮助我。如果我得到的数据是静态的，我可以进行下拉搜索。

在我的代码中，我在drop中提供的数据是动态供应商：SupplierDTO[]；这个(供应商(是我创建的模型，我在其中获取我需要的字段。

.html

<mat-form-field class="box" appearance="fill">
<mat-label>Supplier</mat-label>
<mat-select formControlName="supplierId" (selectionChange)="selectedSupplier($event)">
<mat-option *ngFor="let items of supplier" [value]="items.id">
{{items.companyName}}
</mat-option>

</mat-select>
</mat-form-field>

.ts

export class DeliveryReceiptComponent implements OnInit {
supplier: SupplierDTO[];
}
ngOnInit(): void {
this.selectedSupplier;
}
selectedSupplier(trigger: MatSelectChange)
{
this.selectedSupplierID = trigger.value;
this.supplierSvc.getSupplierDR(this.selectedSupplierID).subscribe((response: any) => {

var splitted = response.split(":", 4)
this.deliveryReceiptForm.get('Bank').patchValue(splitted[0]);
this.deliveryReceiptForm.get('AccountName').patchValue(splitted[1]);
this.deliveryReceiptForm.get('AccountNumber').patchValue(splitted[2]);
this.deliveryReceiptForm.get('Branch').patchValue(splitted[3]);
if(this.deliveryReceiptForm.get('AccountName').value === this.dbmRequired ){
this.APRDisplayed = true;
this.deliveryReceiptForm.get('purchaseRequestNumber').addValidators(Validators.required);
this.deliveryReceiptForm.get('purchaseRequestDate').addValidators(Validators.required);             
this.deliveryReceiptForm.get('drNumFrSupplier').addValidators(Validators.required);
this.deliveryReceiptForm.get('drDate').addValidators(Validators.required);
this.deliveryReceiptForm.get('aprNum').addValidators(Validators.required);
this.deliveryReceiptForm.get('aprDate').addValidators(Validators.required);
this.deliveryReceiptForm.get('purchaseOrderDate').setValue('0001-01-01');
this.deliveryReceiptForm.get('saleInvoiceDate').setValue('0001-01-01');
this.deliveryReceiptForm.get('aprDate').reset();
}
else{
this.APRDisplayed = false;
this.deliveryReceiptForm.get('purchaseOrderNumber').addValidators(Validators.required);
this.deliveryReceiptForm.get('purchaseOrderDate').addValidators(Validators.required); 
this.deliveryReceiptForm.get('purchaseRequestNumber').addValidators(Validators.required);
this.deliveryReceiptForm.get('purchaseRequestDate').addValidators(Validators.required);
this.deliveryReceiptForm.get('saleInvoiceDate').addValidators(Validators.required);
this.deliveryReceiptForm.get('saleInvoiceNumber').addValidators(Validators.required);
this.deliveryReceiptForm.get('drNumFrSupplier').addValidators(Validators.required);
this.deliveryReceiptForm.get('drDate').addValidators(Validators.required);
this.deliveryReceiptForm.get('aprDate').setValue('0001-01-01');
}
})

}

Answer 1

您的响应似乎不是一个数组，而是一个对象。因此，您应该映射以下内容：

getData(){
return this.http.get('https://localhost:44350/api/EamisDeliveryReceipt/list')
.pipe(
map(response  => response.items.map(suppliers => suppliers.supplier.companyName)
)
)
}

提示：您可能应该为这个API返回的类型定义一个接口。这样就更容易对数据执行任何映射。