打开的角度对话框不起作用

Question

我刚刚开始学习 Angular 5，我只需要在单击按钮时打开一个对话框。应用程序无法构建，我出现的错误是“类型仪表板组件上不存在错误 ts2339 属性对话框” 然后我安装了角度材料和cdk。编译时仍然出现相同的错误。在 html 页面（本地主机：4200）上，我得到的错误是'无法读取未定义的属性'打开''。如何获取对话框并打开 Angular 工作？

打字稿：

import { Component, OnInit } from '@angular/core';
import { WebapiService } from '../providers/webapi.service';
import { MatDialog, MatDialogRef } from '@angular/material';
import { ServerDialogComponent } from '../server-dialog/server-dialog.component';

@Component({
  selector: 'app-dashboard',
  templateUrl: './dashboard.component.html',
  styleUrls: ['./dashboard.component.scss']
})
export class DashboardComponent implements OnInit {

  constructor(private webApi: WebapiService) { }

  ngOnInit() {
  }

  openServerDialog() {

    const serverDialogRef = this.dialog.open(ServerDialogComponent, {
      width: '250px',
      data: { serverlist: this.webApi.getServerList() }
    });
  }
}

html:

<div class="main-content">
  <div class="container-fluid">
    <button mat-fab color="warning" (click)="openServerDialog()">open</button>
  </div>
</div>

Answer 1

你需要创建一个dialog within your constructor，没有this.dialog.open(...)会导致Cannot read property 'open' of undefined：

constructor(public dialog: MatDialog, private webApi: WebapiService) {
}

Answer 2

首先在 AppModule 中导入 MatDialogModule

import {MatDialogModule} from '@angular/material/dialog';
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
MatDialogModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

HTML 文件

<button mat-raised-button (click)="openServerDialog()">Pick one</button>

TS 文件

import { WebapiService } from '../providers/webapi.service';
import {Component, Inject,OnInit } from '@angular/core';
import {MatDialog, MatDialogRef, MAT_DIALOG_DATA} from '@angular/material';
import { ServerDialogComponent } from '../server-dialog/server-dialog.component';

@Component({
  selector: 'app-dashboard',
  templateUrl: './dashboard.component.html',
  styleUrls: ['./dashboard.component.scss']
})
export class DashboardComponent implements OnInit {

  constructor(public dialog: MatDialog,private webApi: WebapiService) { }

  ngOnInit() {
  }

  openServerDialog() {

    let serverDialogRef = this.dialog.open(ServerDialogComponent, {
      width: '250px',
      data: { serverlist: this.webApi.getServerList() }
    });
  }
}

ServerDialogComponent ts 文件

@Component({
  selector: 'server_dialog_component ',
  templateUrl: 'server_dialog_component.html',
})
export class ServerDialogComponent {

  constructor(
    public dialogRef: MatDialogRef<ServerDialogComponent>,
    @Inject(MAT_DIALOG_DATA) public data: any) { }

  onNoClick(): void {
    this.dialogRef.close();
  }

}