this.form._updateTreeValidity不是函数

Question

我目前正在使用Angular Forms版本2.0.0，并尝试使用内部的联系表单制作“联系我们”模式。

在ContactComponent加载之后，我立即得到:

例外：this.form._updateTreeValidity不是函数

>

我已经看到其他一些堆栈帖子，它们建议使用FormGroup而不是FormBuilder来初始化组件构造函数中的表单对象，现在是新API的标准配置，所以我已经更新了这一点。

我导入了ReactiveFormsModule和FormsModules以及所有与表单相关的组件，错误似乎与模块无关。

我的TypeScript在编译时没有抛出错误，Visual Studio Intellisense似乎能够很好地找到所有FormGroup函数，那么为什么在运行时会出现这种情况呢？...

我的代码：

联系人.组件. ts:

import { Component, Input, ViewChild } from '@angular/core';
import { ApiService } from '../../../services/api.service';
import { ModalComponent } from 'ng2-bs3-modal/ng2-bs3-modal';
import { Router, ActivatedRoute, Params } from '@angular/router';
import { FormsModule, ReactiveFormsModule, FormGroup, FormControl, Validators } from '@angular/forms';
import 'rxjs/Rx';

declare var jQuery: any;

@Component({
    selector: 'my-contact',
    templateUrl: 'app/modules/footer/contact/contact.html'
})
export class ContactComponent {

    private contactForm: FormGroup;
    private invalidEmail: boolean;
    private invalidSubject: boolean;
    private invalidMessage: boolean;

    constructor(private apiService: ApiService, private router: Router, private route: ActivatedRoute) {
        this.contactForm = new FormGroup({
            emailControl: new FormControl('', <any>Validators.required),
            subjectControl: new FormControl('', <any>Validators.required),
            messageControl: new FormControl('', <any>Validators.required)
        });
    }

    submit() {

        if (this.contactForm.valid) {
            this.apiService.sendMessage(this.contactForm.controls['emailControl'].value, this.contactForm.controls['subjectControl'].value, this.contactForm.controls['messageControl'].value);
        }

        if (!this.contactForm.controls['emailControl'].valid) {
            this.invalidEmail = true;
        }
        if (!this.contactForm.controls['subjectControl'].valid) {
            this.invalidSubject = true;
        }
        if (!this.contactForm.controls['messageControl'].valid) {
            this.invalidMessage = true;
        }

    }

    ngOnInit() {
        this.invalidEmail = false;
        this.invalidSubject = false;
        this.invalidMessage = false;
    }

}

contact.html：

<modal-header class="c-no-border" [show-close]="true">
  <h4 class="modal-title text-uppercase">Send us a message</h4>
</modal-header>

<form novalidate #contactForm [formGroup]="contactForm" (ngSubmit)="submit()">
  <div class="modal-body">
    <div class="form-group">
      <label for="email" class="control-label">Email</label>
      <input name="email" formControlName="emailControl" placeholder="" type="text" class="c-square form-control c-margin-b-20" id="email">
      <div class="c-font-red-1" *ngIf="invalidEmail" style="position: absolute;">*Required</div>
      <label for="subject" class="control-label">Subject</label>
      <input name="subject" formControlName="subjectControl" placeholder="" type="text" class="c-square form-control c-margin-b-20" id="subject">
      <div class="c-font-red-1" *ngIf="invalidSubject" style="position: absolute;">*Required</div>
      <textarea formControlName="messageControl" style="resize: vertical;" class="c-square form-control c-margin-b-20" id="content" (keyup.enter)="submit()"></textarea>
      <div class="c-font-red-1" *ngIf="invalidMessage" style="position: absolute;">*Required</div>
    </div>
  </div>
  <modal-footer class="c-no-padding">
    <button type="button" class="btn c-btn-square c-btn-bold c-btn-uppercase pull-right">Cancel</button>
    <button type="submit" class="btn c-theme-btn c-btn-square c-btn-bold c-btn-uppercase pull-right" style="margin-right: 10px;">Send</button>
  </modal-footer>
</form>

app.module.ts：

import { NgModule, enableProdMode }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { Ng2Bs3ModalModule } from 'ng2-bs3-modal/ng2-bs3-modal';
import { QueuesModule }     from './modules/queues/queues.module';
import { OrderModule }     from './modules/order/order.module';
import { AccountModule } from './modules/account/account.module';
import { AdminModule } from './modules/admin/admin.module';
import { routing } from './app.routing';
import { GridModule } from '@progress/kendo-angular-grid';
import { SplashComponent } from './modules/splash/splash.component';
import { ContactComponent } from './modules/footer/contact/contact.component';

import { SharedModule } from './shared/shared.module';
import { EmailValidator } from './shared/utilities/custom-validators'

import { CookieService } from 'angular2-cookie/services/cookies.service';
import { HttpModule, Response } from '@angular/http';
import { StringService } from './services/string.service';
import { ApiService } from './services/api.service';
import { UserService } from './services/user.service';
import { OrderService } from './services/order.service';
import { OrderGuard } from './services/order-guard.service';
import { FooterComponent } from './modules/footer/footer.component';
import { ErrorComponent } from './modules/error/error.component';
import { CustomFormsModule } from "ng2-validation";

@NgModule({
    imports: [
        BrowserModule,
        FormsModule,
        ReactiveFormsModule,
        HttpModule,
        QueuesModule,
        OrderModule,
        AccountModule,
        AdminModule,
        routing,
        GridModule,
        SharedModule,
        Ng2Bs3ModalModule,
        CustomFormsModule
    ],
    declarations: [
        AppComponent,
        SplashComponent,
        FooterComponent,
        ErrorComponent,
        ContactComponent
    ],
    providers: [
        StringService,
        ApiService,
        UserService,
        CookieService,
        OrderService,
        OrderGuard
    ],
    bootstrap: [AppComponent],
    exports: [
    ]
})

export class AppModule {
}

Answer 1

已经有一段时间了，但对我来说，问题是将formGroup传递给模板，而不是直接引用它。

例如，这不起作用

<ng-template #selectField
             let-field
             let-group
             let-frmName="frmName">
    <ng-container [formGroup]="group">
        <mat-form-field fxFlex="32"
                        floatLabel="always">
            <mat-label>{{field.label}}</mat-label>
            <mat-select [formControlName]="frmName"
                        [required]="field.required">
                <mat-option *ngFor="let option of field.options"
                            [value]="option.value">
                    {{option.description}}
                </mat-option>
            </mat-select>
        </mat-form-field>
    </ng-container>
</ng-template>

如果我直接使用我的formGroup实例，它就可以正常工作。

希望这能有所帮助。

Answer 2

当您错误地将< code>formGroup= " ... "添加到您的模板时而不是< code>[formGroup]= " ... "您也会收到此错误消息。

Answer 3

绑定模板变量< code>#contactForm似乎会导致名称冲突，并破坏模板处理器，因为它试图将附加的模板变量转换为后端的< code>NgForm。在我见过的所有使用模型驱动表单的地方，表单上都没有绑定模板变量，而在模板驱动表单中使用了< code>#tv="ngForm"。这两种形式的混合方法似乎存在失误，导致了错误。

只需删除它即可解决问题。