html - Angular 4 表单重置提交到服务器

Question

我有以下 HTML 表单:

<form class="row" name="powerPlantSearchForm" (ngSubmit)="f.valid && searchPowerPlants()" #f="ngForm" novalidate>
          <div class="form-group col-xs-3" >
            <label for="powerPlantName">PowerPlant Name</label>
            <input type="text" class="form-control-small" [ngClass]="{ 'has-error': f.submitted && !powerPlantName.valid }" name="powerPlantName" [(ngModel)]="model.powerPlantName" #powerPlantName="ngModel" />
          </div>
          <div class="form-group col-xs-3" >
            <label for="powerPlantType">PowerPlant Type</label>
            <select class="form-control" [(ngModel)]="model.powerPlantType" name="powerPlantType">
              <option value="" disabled>--Select Type--</option>
              <option [ngValue]="powerPlantType" *ngFor="let powerPlantType of powerPlantTypes">
                {{ powerPlantType }}
              </option>
            </select>
          </div>
          <div class="form-group col-xs-3" >
            <label for="organizationName">Organization Name</label>
            <input type="text" class="form-control-small" name="powerPlantOrganization" [(ngModel)]="model.powerPlantOrg" #organizationName="ngModel" />
          </div>
          <div class="form-group col-xs-3" >
            <label for="powerPlantStatus">PowerPlant Active Status</label>
            <select class="form-control" [(ngModel)]="model.powerPlantStatus" name="powerPlantStatus">
              <option value="" disabled>--Select Status--</option>
              <option [ngValue]="powerPlantStatus" *ngFor="let powerPlantStatus of powerPlantStatuses">
                {{ powerPlantStatus }}
              </option>
            </select>
          </div>
          <div class="form-group col-md-3 col-xs-4">
            <button [disabled]="loading" class="btn btn-primary">Search</button>
            <img *ngIf="loading" src="data:image/gif;base64,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" />
          </div>
          <div class="form-group col-md-3 col-xs-3">
            <button class="btn btn-primary" (click)="f.reset()">Reset</button>
          </div>
        </form>

这是我的组件:

export class HomeComponent implements OnInit {
  // Represents the PowerPlantTypes
  powerPlantTypes = ['RampUpType', 'OnOffType'];
  // Represents the status of a PowerPlant
  powerPlantStatuses = ['Active & Disabled', 'Active', 'Disabled'];
  // Represents the search form
  model: any = {};
  // currentUser: User;
  // represents the list of PowerPlant data
  powerPlants: PowerPlant[];
  users: User[] = [];

  constructor(private powerPlantService: PowerPlantService) {
    // this.currentUser = JSON.parse(localStorage.getItem('currentUser'));
    // Set the initial values for the drop down fields in the UI
  }

  ngOnInit() {
    this.model.powerPlantType = '';
    this.model.powerPlantStatus = '';
  }

  selectName() {
    alert(this.model.powerPlantType);
  }

  searchPowerPlants(): void {
    const powerPlantSearchParams = new PowerPlantSearchParams(
      this.model.powerPlantType,
      this.model.powerPlantOrg,
      this.model.powerPlantName,
      this.model.page,
      this.model.powerPlantStatus);

    this.powerPlantService.searchPowerPlants(powerPlantSearchParams).subscribe(result => {
      this.powerPlants = <PowerPlant[]> result;
    });
  }

  allPowerPlants(onlyActive: boolean = false, page: number = 1): void {
    this.powerPlantService.allPowerPlants(onlyActive, page).subscribe(result => {
      this.powerPlants = <PowerPlant[]> result;
    });
  }
}

当我在我的 html 页面中单击重置按钮时，将调用方法 searchPowerPlants()。我该如何避免这种情况？

编辑:使用 type="reset"后，它不再提交给服务器，但下拉列表显示其他值而不是默认值。从下面的屏幕截图中可以看出，在按下重置按钮后，下拉菜单现在将 RampUpType 显示为 PowerPlantType，但我更希望它显示 --Select Type--

Answer 1

在你的按钮上输入 type="button"并删除 f.reset()。相反:

    <button type="button" (click)="reset()" class="btn btn-primary">Reset</button>

和

  reset(){
    this.model.powerPlantType = '';
    this.model.powerPlantStatus = '';

  }

您还可以从 ngOnInit() 调用 reset()。但也不要忘记为其他输入添加重置值。

https://stackblitz.com/edit/angular-zx3uwx?file=app%2Fapp.component.html