Question

我正在从我的API中检索车辆数据的信息。然后验证字段。

我的ts文件如下：

vehicleDetails = new CartellInfo();

ngOnInit() {
    this.claimForm = this.formBuilder.group({
        plateNumber: [ this.vehicleDetails.registration, [Validators.required] ],
        vehicleManufacturer: [ this.vehicleDetails.make, [Validators.required] ],
        vehicleModel: [ this.vehicleDetails.model, [Validators.required] ],
        vehicleRange: [ this.vehicleDetails.description, [Validators.required] ],
        chasisNumber: [ this.vehicleDetails.chassisNumber, [Validators.required] ],
        fuelType: [ this.vehicleDetails.fuelType, [Validators.required] ],
        dateFirstRegistered: [ this.vehicleDetails.firstRegistrationDate, [Validators.required] ],
        engineCapacity: [ this.vehicleDetails.engineCapacity, [Validators.required] ]
    });
}

findVehicle() {
    if (this.registration !== null) {

        this.cartellService.findVehicle(this.registration)
        .subscribe(
        res => {
            this.vehicleFound = true;
            this.vehicleDetails = res;
        });
    }
}

其中一个的HTML看起来像这样：

<button class="btn btn-secondary" (click)="findVehicle()">FIND VEHICLE</button>

<input class="form-control"
    [ngClass]="{'mat-form-field-readonly': vehicleDetails.model || available }"
    [readonly]="vehicleDetails.model || available"
    name="vehicleModel"
    [formControl]="f.vehicleModel"
>
<mat-error *ngIf="submitted && f.vehicleModel.hasError('required')">
    Vehicle model is <strong>required</strong>
</mat-error>

但是我的输入并不反映来自API的数据。如果您在后面查看代码，则该值在那里，但没有显示出来。

我做错了什么？

Answer 1

收到回复后，您需要设置表格。

this.cartellService.findVehicle(this.registration)
  .subscribe(
    res => {
      this.vehicleFound = true;
      this.vehicleDetails = res;
      this.claimForm = this.formBuilder.group({
          plateNumber: [ this.vehicleDetails.registration, [Validators.required] ],
          vehicleManufacturer: [ this.vehicleDetails.make, [Validators.required] ],
          vehicleModel: [ this.vehicleDetails.model, [Validators.required] ],
          vehicleRange: [ this.vehicleDetails.description, [Validators.required] ],
          chasisNumber: [ this.vehicleDetails.chassisNumber, [Validators.required] ],
          fuelType: [ this.vehicleDetails.fuelType, [Validators.required] ],
          dateFirstRegistered: [ this.vehicleDetails.firstRegistrationDate, [Validators.required] ],
          engineCapacity: [ this.vehicleDetails.engineCapacity, [Validators.required] ]
      });
    });

或者您可以设置带有响应的表单值。

this.cartellService.findVehicle(this.registration)
  .subscribe(
    res => {
      this.vehicleFound = true;
      this.vehicleDetails = res;
      this.claimForm.setValue({
          plateNumber: this.vehicleDetails.registration,
          vehicleManufacturer: this.vehicleDetails.make,
          vehicleModel: this.vehicleDetails.model,
          vehicleRange: this.vehicleDetails.description,
          chasisNumber: this.vehicleDetails.chassisNumber,
          fuelType: this.vehicleDetails.fuelType,
          dateFirstRegistered: this.vehicleDetails.firstRegistrationDate,
          engineCapacity: this.vehicleDetails.engineCapacity
      });
    });

Answer 2

就我而言，有必要在回调中手动运行更改检测。这可以通过导入来实现

internal fun switchWifi(value: Boolean) {
val wifiManager = ApplicationProvider.getApplicationContext<YourApplicationClass>().getSystemService(Context.WIFI_SERVICE) as WifiManager
wifiManager.isWifiEnabled = value}

并运行

constructor(private changeDetectorRef: ChangeDetectorRef) {
}

Angular反应形式-异步调用中的值未更新形式

2 个答案: