canDeactivate Guard服务中的Angular use modal对话框,用于未提交的更改(表单脏)

我用 ngx-bootstrap Modals 和 RxJs Subjects .

import { Component } from '@angular/core';
import { Subject } from 'rxjs/Subject';
import { BsModalRef } from 'ngx-bootstrap';

@Component({
  selector: 'app-confirm-leave',
  templateUrl: './confirm-leave.component.html',
  styleUrls: ['./confirm-leave.component.scss']
})
export class ConfirmLeaveComponent {

  subject: Subject<boolean>;

  constructor(public bsModalRef: BsModalRef) { }

  action(value: boolean) {
    this.bsModalRef.hide();
    this.subject.next(value);
    this.subject.complete();
  }
}

以下是模板:

<div class="modal-header modal-block-primary">
  <button type="button" class="close" (click)="bsModalRef.hide()">
    <span aria-hidden="true">&times;</span><span class="sr-only">Close</span>
  </button>
  <h4 class="modal-title">Are you sure?</h4>
</div>
<div class="modal-body clearfix">
  <div class="modal-icon">
    <i class="fa fa-question-circle"></i>
  </div>
  <div class="modal-text">
    <p>The form has not been submitted yet, do you really want to leave page?</p>
  </div>
</div>
<div class="modal-footer">
  <button class="btn btn-default" (click)="action(false)">No</button>
  <button class="btn btn-primary right" (click)="action(true)">Yes</button>
</div>

import { CanDeactivate } from '@angular/router';
import { FormGroup } from '@angular/forms';
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs/Subject';
import { BsModalService } from 'ngx-bootstrap';

import { ConfirmLeaveComponent } from '.....';

export interface FormComponent {
  form: FormGroup;
}

@Injectable()
export class UnsavedChangesGuardService implements CanDeactivate<FormComponent> {

  constructor(private modalService: BsModalService) {}

  canDeactivate(component: FormComponent) {
    if (component.form.dirty) {
      const subject = new Subject<boolean>();

      const modal = this.modalService.show(ConfirmLeaveComponent, {'class': 'modal-dialog-primary'});
      modal.content.subject = subject;

      return subject.asObservable();
    }

    return true;
  }
}

应用程序内。单元ts文件转到@NgModule部分,并将ConfirmLeaveComponent组件添加到entryComponents。

@NgModule({
  entryComponents: [
    ConfirmLeaveComponent,
  ]
})

除了ShinDarth的好解决方案之外,似乎值得一提的是,您还必须涵盖对模式的取消,因为action()方法可能不会被激发(例如,如果您允许esc按钮或在模式外单击)。在这种情况下,observable永远不会完成,如果你使用它进行路由,你的应用程序可能会卡住。

onHide 并将其与行为主体合并在一起:

confirmModal(text?: string): Observable<boolean> {
    const subject = new Subject<boolean>();
    const modal = this.modalService.show(ConfirmLeaveModalComponent);
    modal.content.subject = subject;
    modal.content.text = text ? text : 'Are you sure?';
    const onHideObservable = this.modalService.onHide.map(() => false);
    return merge(
      subject.asObservable(),
      onHideObservable
    );
  }

在我的例子中,我映射了提到的 可以观察到错误,因为在我的案例中,解雇被视为中止( 只有

只需扩展mitschmidt提供的关于单击外部/转义按钮的附加信息,这个canDeactivate方法可以与Francesco Borzi的代码一起工作。我只是在函数中内联添加了subscribe to onHide():

canDeactivate(component: FormComponent) {
        if (component.form.dirty) {
            const subject = new Subject<boolean>();

            const modal = this.modalService.show(ConfirmLeaveComponent, { 'class': 'modal-dialog-primary' });
            modal.content.subject = subject;

            this.modalService.onHide.subscribe(hide => {
                subject.next(false);
                return subject.asObservable();
            });

            return subject.asObservable();
        }

        return true;
    }

由于我一直在来回与阿什温,我决定张贴我的解决方案,我与角度和材料。

这是我的 StackBlitz

这是我的实现,使用ngx引导对话框在离开某个路由之前获得一个确认对话框。在服务的帮助下,我有一个名为“canNavigate”的全局变量。如果为true或false,此变量将保留布尔值,以查看是否可以进行导航。该值最初为true,但如果我在组件中进行更改,我将使其为false,因此“canNavigate”将为false。如果为false,我将打开对话框,如果用户放弃更改,它将通过使用queryParams转到所需的路由,否则它将不会路由。

@Injectable()
export class AddItemsAuthenticate implements CanDeactivate<AddUniformItemComponent> {

  bsModalRef: BsModalRef;
  constructor(private router: Router,
              private dataHelper: DataHelperService,
              private modalService: BsModalService) {
  }

  canDeactivate(component: AddUniformItemComponent,
                route: ActivatedRouteSnapshot,
                state: RouterStateSnapshot,
                nextState?: RouterStateSnapshot): boolean {
    if (this.dataHelper.canNavigate === false ) {
      this.bsModalRef = this.modalService.show(ConfirmDialogComponent);
      this.bsModalRef.content.title = 'Discard Changes';
      this.bsModalRef.content.description = `You have unsaved changes. Do you want to leave this page and discard
                                            your changes or stay on this page?`;

      this.modalService.onHidden.subscribe(
        result => {
          try {
            if (this.bsModalRef && this.bsModalRef.content.confirmation) {
              this.dataHelper.canNavigate = true;
              this.dataHelper.reset();;
              const queryParams = nextState.root.queryParams;
              this.router.navigate([nextState.url.split('?')[0]],
                {
                  queryParams
                });
            }
          }catch (exception) {
            // console.log(exception);
          }
        }, error => console.log(error));
    }

    return this.dataHelper.canNavigate;

  }
}

您可以将值传递给 afterClosed

// modal.component.html
<mat-dialog-actions>
  <button mat-button mat-dialog-close>Cancel</button>
  <button mat-button [mat-dialog-close]="true">Leave</button>
</mat-dialog-actions>

// unsaved-changes.service.ts
@Injectable({ providedIn: 'root' })
export class UnsavedChangesGuardService
  implements CanDeactivate<FormComponent> {
  constructor(private _dialog: MatDialog) {}

  canDeactivate(component: FormComponent) {
    if (component.form.dirty) {
      const dialogRef = this._dialog.open(UnsavedChangesDialogComponent);
      return dialogRef.afterClosed();
    }

    return true;
  }
}

我使用“角度材质”对话框实现了此解决方案:

if (component.isDirty()) {
  const subject = new Subject<boolean>();
  const modal = this.dialog.open(ConfirmationDialogComponent, {
    panelClass: 'my-panel', width: '400px', height: '400px',
  });

  modal.componentInstance.subject = subject;
  return subject.asObservable()
}
  return true;
}

这是一个没有主题的工作解决方案,您可以添加布尔属性

import { Component, OnInit } from '@angular/core';
import { BsModalRef } from 'ngx-bootstrap/modal';

@Component({
  selector: 'app-leave-form-confirmation',
  templateUrl: './leave-form-confirmation.component.html',
  styleUrls: ['./leave-form-confirmation.component.scss']
})
export class LeaveFormConfirmationComponent implements OnInit {
  confirmed = false;
  constructor(public bsModalRef: BsModalRef) { }

  ngOnInit(): void {
  }
  confirm = () => {
    this.confirmed= true;
    this.bsModalRef.hide()
  }
}

这是html

<div class="modal-header">
  <h4 class="modal-title pull-left">Confirmation</h4>
</div>
<div class="modal-body">
  <h2>Data will be lost, Are you sure to leave the form?</h2>
</div>-*
<div class="modal-footer">
  <button type="button" class="btn btn-default" (click)="confirm()">confirm</button>
  <button type="button" class="btn btn-default" (click)="bsModalRef.hide()">cancel</button>
</div>

 canDeactivate(
    component: DataStatus,
    currentRoute: ActivatedRouteSnapshot,
    currentState: RouterStateSnapshot,
    nextState?: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    if(!component.isDataSaved()) {
      const modalRef = this.modalService.show(LeaveFormConfirmationComponent,  {
        backdrop: false,
        ignoreBackdropClick: true
      })
      return modalRef.onHidden.pipe(map(_ => modalRef.content.confirmed));
    }
    return of(true);
  }