angular2 MdDialog 未显示为弹出窗口 [英] angular2 MdDialog is not appearing as a popup

问题描述

所以我尝试使用 MdDialog 来显示错误消息.不幸的是，它显示的不是弹出窗口，而是页面底部的块.

So I'm trying to use an MdDialog to display an error message. Unfortunately, it appears not as a popup, but as a block at the bottom of the page.

我需要查看或更改哪些内容才能使其正常工作?

What do I need to look at or change to make this work correctly?

下面的代码

common-modal.component.html

<h2 md-dialog-title>{{ title }}</h2>
<md-dialog-content>
    <p>{{ message }}</p>
</md-dialog-content>
<md-dialog-actions align="right">
    <button md-raised-button md-dialog-close>{{ closeText }}</button>
    <button md-raised-button *ngIf="enableNext" id="sm-next-button"
            (click)="dialogRef.close(true)">{{ nextText }}</button>
</md-dialog-actions>

common-modal.component.ts

import { Component }   from '@angular/core';
import { MdDialogRef } from "@angular/material";

@Component({
    selector: 'common-modal',
    templateUrl: 'common-modal.component.html',
    styleUrls: [ '../modal.component.scss']
})
export class CommonModalComponent {
    /**
     * The text for the header or title of the dialog.
     */
    title: string;
    /**
     * The text for the body or content of the dialog.
     */
    message: string;
    /**
     * The text of the close button. (No, Done, Cancel, etc)
     */
    closeText: string;
    /**
     * The text of the confirming button. (Yes, Next, etc)
     */
    nextText: string;
    /**
     * True to show the next button. False to hide it.
     */
    enableNext: boolean;

    constructor(public dialogRef: MdDialogRef<CommonModalComponent>) { }
}

error-modal.service.ts

import { Injectable }                            from "@angular/core";
import { MdDialog, MdDialogRef, MdDialogConfig } from "@angular/material";
import { Observable }                            from "rxjs";

import { CommonModalComponent }                  from "./common-modal/common-modal.component";
import { HIDE_NEXT_BUTTON }                      from "../constants";

@Injectable()
export class ErrorModalService
{
    constructor(private dialog: MdDialog) { }

    config = new MdDialogConfig();

    /**
     * Show the MdDialog as an alertDialog
     * @param title {string} The title text of the dialog
     * @param message {string} The message content text of the dialog
     * @param closeText {string} The text of the close button. (No, Done, Cancel, etc.) Default is OK
     * @return {Observable<any>} True will be returned if the next button is clicked. Nothing will be returned if canceled.
     */
    public show( title: string, message: string, closeText = "OK"): Observable<any> {

        let dialogRef: MdDialogRef<CommonModalComponent>;

        this.config.role = 'alertdialog';

        dialogRef = this.dialog.open(CommonModalComponent, this.config);

        dialogRef.componentInstance.title = title;
        dialogRef.componentInstance.message = message;
        dialogRef.componentInstance.closeText = closeText;
        dialogRef.componentInstance.nextText = '';
        dialogRef.componentInstance.enableNext = HIDE_NEXT_BUTTON;

        return dialogRef.afterClosed();
    }
}

login.component.ts

import { Component }            from '@angular/core'
import { Router }               from '@angular/router'
import { Response }             from '@angular/http'

import { LoginService }         from './login.service'
import { Login }                from './loginModel'
import { ErrorModalService }    from "../../shared/modal/error-modal.service";

@Component({
               selector: 'login',
               providers: [LoginService],
               templateUrl: 'login.component.html',
               styleUrls: ['login.component.scss']
           })
export class LoginComponent {

    loginModel: Login          = new Login('', '');
    protected userName: string = '';
    protected password: string = '';

    constructor(private router: Router,
                private loginService: LoginService,
                private errorModalService: ErrorModalService) { }

    private onSubmit() {
        this.loginService.login(this.loginModel)
            .subscribe(
                response => this.handleLoginCallback(response),
                error => {
                        this.errorModalService.config = {
                        height: "210px",
                        width: "200px",
                        position: {top: "0", left: "0"}
                    };
                    this.errorModalService.show(
                        "LOGIN ERROR",
                        "Incorrect username or password. Please try again."
                    );
                });
    }
}

推荐答案

看起来 material2 主题 css 也包含一些功能性 css，如果没有这个叠加层就不能正常工作.Material2 入门指南 提到需要主题.但是很容易错过这个.

It appears that material2 theming css also contains some functional css and without this overlay doesn't work properly. Material2 getting started guide mentions that theme is required. But its easy to miss this.

尝试在styles.css中导入一些材质主题

Try importing some material theme in styles.css

@import '~@angular/material/core/theming/prebuilt/deeppurple-amber.css';

或

@import "node_modules/@angular/material/core/theming/prebuilt/deeppurple-amber.css";

实际路径可能不同.

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