如何在angular 2中创建动态菜单?
我需要在用户成功登录并使用Angular 2重定向到主页后创建一个动态菜单。与第一个类似的问题完全一样,只是我不能硬核菜单项如何在angular 2中创建动态菜单?,angular,angular2-template,angular2-services,Angular,Angular2 Template,Angular2 Services,我需要在用户成功登录并使用Angular 2重定向到主页后创建一个动态菜单。与第一个类似的问题完全一样,只是我不能硬核菜单项 #app.component.html# **home.component.ts** 从“@angular/core”导入{Component,OnInit}; 从“../\u模型/索引”导入{User}; 从“../\u services/index”导入{UserService}; @组成部分({ //moduleId:module.id, templateUrl:
#app.component.html#
**home.component.ts**
从“@angular/core”导入{Component,OnInit};
从“../\u模型/索引”导入{User};
从“../\u services/index”导入{UserService};
@组成部分({
//moduleId:module.id,
templateUrl:'home.component.html'
})
导出类HomeComponent实现OnInit{
用户:用户[]=[];
构造函数(私有用户服务:用户服务){}
恩戈尼尼特(){
//从安全api端点获取用户
this.userService.getUsers()
.订阅(用户=>{
this.users=用户;
});
}
}
显然,我对这项技术还不熟悉。有人来拿这个吗
Blockquote以下是我的工作。基本上,流程是在应用程序组件中设置一个监听器,订阅getLoggedIn的可观察项。当可观察到的发射(用户登录)时,我调用app.menu.service get loggin menu。注销时,反过来是真的,我得到noLoginMenu app.menu.service:
import {RouterModule, RouterLinkActive, RouterLink} from '@angular/router';
import {Injectable} from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';
import { Subscription } from 'rxjs';
@Injectable()
export class AppMenuService {
constructor() {
}
getNoLoginMenu() {
return [
{
label: 'Home',
routerLink: ['']
}, {
label: 'Documents',
routerLink: ['/document']
}, {
label: 'Calculator',
routerLink: ['/calculator']
}, {
label: 'Verify',
routerLink: ['/verify']
}, {
label: 'About',
routerLink: ['/about']
}];
}
getLoggedInMenu() {
return [
{
label: 'Home',
routerLink: ['']
}, {
label: 'Documents',
routerLink: ['/document']
}, {
label: 'Food',
routerLink: ['/food']
}, {
label: 'Calculator',
routerLink: ['/calculator']
}, {
label: 'Settings',
routerLink: ['/settings']
}, {
label: 'Themes',
routerLink: ['/themes']
}, {
label: 'About',
routerLink: ['/about']
}, {
label: 'Logout',
routerLink: ['/logout']
//command: (event: Event) => { this.onLogout() }
}];
}
}
app.component.ts
export class AppComponent implements OnInit, OnDestroy {
private items: MenuItem[];
appPageHeaderDivStyle: {};
selectedTheme: Theme;
errorMessage: string;
loggedIn: LoggedIn;
loggedInEmail: string = "";
isLoggedIn: boolean;
themeSub: Subscription;
loggedInSub: Subscription;
profileSub: Subscription;
constructor(
private as: AppMenuService,
private ts: ThemeService,
private ss: SettingsService,
private fs: FoodService,
private ls: LoginService) {
}
@HostListener('window:beforeunload', ['$event'])
beforeUnloadHander(event) {
var shutdown = this.onShutdown();
//event.preventDefault();
}
ngOnInit() {
this.themeSub = this.ts.getNewTheme()
.subscribe(
theme => this.selectedTheme = theme,
error => {
this.errorMessage = error
},
() => this.completeGetNewTheme()
);
this.ts.setTheme("Pepper-Grinder");
this.items = this.as.getNoLoginMenu();
this.ls.getLoggedIn()
.subscribe(
loggedIn => {
if (loggedIn.error != undefined && loggedIn.error === "" && loggedIn.email != "") {
this.items = this.as.getLoggedInMenu();
var us = this.ss.getUserSettings();
if (us != undefined && us.theme != null && us.theme != "") {
this.ts.setTheme(us.theme);
}
}
else {
this.items = this.as.getNoLoginMenu();
this.ts.setTheme("Pepper-Grinder");
}
this.completeLoggedIn(loggedIn.email);
});
}
ngOnDestroy() {
if (this.themeSub) {
this.themeSub.unsubscribe();
}
if(this.loggedInSub) {
this.loggedInSub.unsubscribe();
}
if(this.profileSub) {
this.profileSub.unsubscribe();
}
}
completeLoggedIn(email: string) {
this.loggedInEmail = email;
this.isLoggedIn = (this.loggedInEmail.length > 0);
}
completeGetNewTheme() {
this.appPageHeaderDivStyle = this.ts.getAppPageHeaderDivStyle();
}
onShutdown(): boolean {
var ok = true;
this.fs.completeUpdateDailyFood();
this.profileSub = this.ss.updateProfileInformation(this.ss.getUserSettings())
.subscribe(
status => {
console.log("logout - updated user");
},
error => {
ok = false;
},
);
return ok;
}
onLogout() {
}
}
登录服务:
loginUser(localUser: LocalUser) {
this.authSub = this.auth.loginUser(localUser)
.subscribe(
token => {
this.token = token
},
error => {
this.isLoggingIn = false;
var errorObject = JSON.parse(error._body);
this.errorMessage = errorObject.error_description;
console.log(this.errorMessage);
this.setLoggedIn({ email: "", password: "", error: this.errorMessage });
},
() => this.completeLogin(localUser));
}
在用户登录后,我根据用户访问权限创建了动态菜单。我想我无法在最初的问题中正确地表达要求。昨天,在搜索“如何使两个组件相互通信”时,我在angular网站上找到了以下内容(参见下面的链接): 我们可以通过使用全局EventEmitter来实现这一点。以下是我如何在代码中实现它: GlobalEventManager:
import { Injectable, EventEmitter } from "@angular/core";
@Injectable()
export class GlobalEventsManager {
public showNavBar: EventEmitter<any> = new EventEmitter();
public hideNavBar: EventEmitter<any> = new EventEmitter();
}
menu.component.ts中使用的模型
export class AppComponent implements OnInit, OnDestroy {
private items: MenuItem[];
appPageHeaderDivStyle: {};
selectedTheme: Theme;
errorMessage: string;
loggedIn: LoggedIn;
loggedInEmail: string = "";
isLoggedIn: boolean;
themeSub: Subscription;
loggedInSub: Subscription;
profileSub: Subscription;
constructor(
private as: AppMenuService,
private ts: ThemeService,
private ss: SettingsService,
private fs: FoodService,
private ls: LoginService) {
}
@HostListener('window:beforeunload', ['$event'])
beforeUnloadHander(event) {
var shutdown = this.onShutdown();
//event.preventDefault();
}
ngOnInit() {
this.themeSub = this.ts.getNewTheme()
.subscribe(
theme => this.selectedTheme = theme,
error => {
this.errorMessage = error
},
() => this.completeGetNewTheme()
);
this.ts.setTheme("Pepper-Grinder");
this.items = this.as.getNoLoginMenu();
this.ls.getLoggedIn()
.subscribe(
loggedIn => {
if (loggedIn.error != undefined && loggedIn.error === "" && loggedIn.email != "") {
this.items = this.as.getLoggedInMenu();
var us = this.ss.getUserSettings();
if (us != undefined && us.theme != null && us.theme != "") {
this.ts.setTheme(us.theme);
}
}
else {
this.items = this.as.getNoLoginMenu();
this.ts.setTheme("Pepper-Grinder");
}
this.completeLoggedIn(loggedIn.email);
});
}
ngOnDestroy() {
if (this.themeSub) {
this.themeSub.unsubscribe();
}
if(this.loggedInSub) {
this.loggedInSub.unsubscribe();
}
if(this.profileSub) {
this.profileSub.unsubscribe();
}
}
completeLoggedIn(email: string) {
this.loggedInEmail = email;
this.isLoggedIn = (this.loggedInEmail.length > 0);
}
completeGetNewTheme() {
this.appPageHeaderDivStyle = this.ts.getAppPageHeaderDivStyle();
}
onShutdown(): boolean {
var ok = true;
this.fs.completeUpdateDailyFood();
this.profileSub = this.ss.updateProfileInformation(this.ss.getUserSettings())
.subscribe(
status => {
console.log("logout - updated user");
},
error => {
ok = false;
},
);
return ok;
}
onLogout() {
}
}
特点:
export class Features {
Description: string;
RoutePath: string;
}
menu.component.ts:
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import { Features } from '../_models/features';
import { Http, Headers, RequestOptions, Response } from '@angular/http';
import { GlobalEventsManager } from "../_common/gobal-events-manager";
@Component({
selector: 'nav',
templateUrl: './menu.component.html'
})
export class MenuComponent {
showNavBar: boolean = false;
featureList: Features[] = [];
private headers = new Headers({ 'Content-Type': 'application/json' });
constructor(private http: Http, private router: Router, private globalEventsManager: GlobalEventsManager) {
this.globalEventsManager.showNavBar.subscribe((mode: any) => {
this.showNavBar = mode;
if (this.showNavBar = true) {
<!-- the below function expects user id, here I have given as 1 -->
this.getFeatureListByLoggedInUser(1)
.then(list => { this.featureList = list; });
}
});
this.globalEventsManager.hideNavBar.subscribe((mode: any) => {
this.showNavBar = false;
this.featureList = [];
});
}
private getFeatureListByLoggedInUser(userID: number): Promise<Features[]> {
return this.http.get(your api url + '/Feature/GetFeatureListByUserID?userID=' + userID)
.toPromise()
.then(response => response.json() as Features[])
.catch(this.handleError);
}
private handleError(error: any): Promise<any> {
console.error('An error occurred', error); // for demo purposes only
return Promise.reject(error.message || error);
}
}
<!-- menu container -->
<nav>
</nav>
<!-- main app container -->
<div class="container-fluid body-content-custom">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12 no-padding">
<router-outlet></router-outlet>
</div>
</div>
<footer class="footer">
</footer>
In the last, we need to register the providers of menu and global event manager in app.module.ts
app.module.ts
/// <reference path="reset-password/reset-password.component.ts" />
/// <reference path="reset-password/reset-password.component.ts" />
import './rxjs-extensions';
import { NgModule, ErrorHandler } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { HttpModule, XHRBackend } from '@angular/http';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { AuthGuard } from './_guards/auth.guard';
import { ContentHeaders } from './_common/headers';
import { GlobalEventsManager } from "./_common/gobal-events-manager";
import { MenuComponent } from "./menu/menu.component";
@NgModule({
imports: [
BrowserModule,
FormsModule,
HttpModule,
AppRoutingModule,
ReactiveFormsModule
],
declarations: [
AppComponent,
MenuComponent
],
providers: [
AuthGuard,
ContentHeaders,
GlobalEventsManager
],
bootstrap: [AppComponent]
})
export class AppModule { }
从'@angular/core'导入{Component,OnInit};
从'@angular/Router'导入{Router};
从“../\u模型/特征”导入{Features};
从'@angular/Http'导入{Http,Headers,RequestOptions,Response};
从“./_common/gobal events manager”导入{GlobalEventsManager}”;
@组成部分({
选择器:“导航”,
templateUrl:“./menu.component.html”
})
导出类菜单组件{
showNavBar:boolean=false;
功能列表:功能[]=[];
私有头=新头({'Content-Type':'application/json'});
构造函数(专用http:http,专用路由器:路由器,专用globalEventsManager:globalEventsManager){
this.globalEventsManager.showNavBar.subscribe((模式:any)=>{
this.showNavBar=模式;
如果(this.showNavBar=true){
this.getFeatureListByLoggedInUser(1)
.then(list=>{this.featureList=list;});
}
});
this.globalEventsManager.hideNavBar.subscribe((模式:any)=>{
this.showNavBar=false;
this.featureList=[];
});
}
私有getFeatureListByLoggedInUser(用户ID:number):承诺{
返回此.http.get(您的api url+'/Feature/GetFeatureListByUserID?userID='+userID)
.toPromise()
.then(response=>response.json()作为特性[])
.接住(这个.把手错误);
}
私有句柄错误(错误:任意):承诺{
console.error('发生错误',error);//仅用于演示目的
返回承诺。拒绝(error.message | | error);
}
}
Menu.Component.html:
<div id="navbar" *ngIf="showNavBar" class="navbar-collapse collapse navbar-collapse-custom">
<ul class="nav navbar-nav nav_menu full-width">
<li *ngFor="let feature of featureList" class="nav_menu" routerLinkActive="active"><a class="nav-item nav-link" [routerLink]="[feature.routepath]" routerLinkActive="active">{{feature.description}}</a></li>
</ul>
</div>
- {{feature.description}
App.Component.ts:
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import { Features } from '../_models/features';
import { Http, Headers, RequestOptions, Response } from '@angular/http';
import { GlobalEventsManager } from "../_common/gobal-events-manager";
@Component({
selector: 'nav',
templateUrl: './menu.component.html'
})
export class MenuComponent {
showNavBar: boolean = false;
featureList: Features[] = [];
private headers = new Headers({ 'Content-Type': 'application/json' });
constructor(private http: Http, private router: Router, private globalEventsManager: GlobalEventsManager) {
this.globalEventsManager.showNavBar.subscribe((mode: any) => {
this.showNavBar = mode;
if (this.showNavBar = true) {
<!-- the below function expects user id, here I have given as 1 -->
this.getFeatureListByLoggedInUser(1)
.then(list => { this.featureList = list; });
}
});
this.globalEventsManager.hideNavBar.subscribe((mode: any) => {
this.showNavBar = false;
this.featureList = [];
});
}
private getFeatureListByLoggedInUser(userID: number): Promise<Features[]> {
return this.http.get(your api url + '/Feature/GetFeatureListByUserID?userID=' + userID)
.toPromise()
.then(response => response.json() as Features[])
.catch(this.handleError);
}
private handleError(error: any): Promise<any> {
console.error('An error occurred', error); // for demo purposes only
return Promise.reject(error.message || error);
}
}
<!-- menu container -->
<nav>
</nav>
<!-- main app container -->
<div class="container-fluid body-content-custom">
<div class="col-lg-12 col-md-12 col-sm-12 col-xs-12 no-padding">
<router-outlet></router-outlet>
</div>
</div>
<footer class="footer">
</footer>
In the last, we need to register the providers of menu and global event manager in app.module.ts
app.module.ts
/// <reference path="reset-password/reset-password.component.ts" />
/// <reference path="reset-password/reset-password.component.ts" />
import './rxjs-extensions';
import { NgModule, ErrorHandler } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { HttpModule, XHRBackend } from '@angular/http';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { AuthGuard } from './_guards/auth.guard';
import { ContentHeaders } from './_common/headers';
import { GlobalEventsManager } from "./_common/gobal-events-manager";
import { MenuComponent } from "./menu/menu.component";
@NgModule({
imports: [
BrowserModule,
FormsModule,
HttpModule,
AppRoutingModule,
ReactiveFormsModule
],
declarations: [
AppComponent,
MenuComponent
],
providers: [
AuthGuard,
ContentHeaders,
GlobalEventsManager
],
bootstrap: [AppComponent]
})
export class AppModule { }
最后,我们需要在app.module.ts中注册菜单和全局事件管理器的提供者
app.module.ts
///
///
导入“/rxjs扩展名”;
从'@angular/core'导入{NgModule,ErrorHandler};
从“@angular/platform browser”导入{BrowserModule};
从'@angular/forms'导入{FormsModule,ReactiveFormsModule};
从'@angular/http'导入{HttpModule,XHRBackend};
从“./app routing.module”导入{AppRoutingModule};
从“./app.component”导入{AppComponent};
从“/_guards/auth.guard”导入{AuthGuard};
从“/_common/headers”导入{ContentHeaders};
从“/_common/gobal events manager”导入{GlobalEventsManager}”;
从“/menu/menu.component”导入{MenuComponent};
@NGD模块({
进口:[
浏览器模块,
FormsModule,
HttpModule,
批准模块,
反应窗体模块
],
声明:[
应用组件,
菜单组件
],
供应商:[
AuthGuard,
ContentHeaders,
全球财务经理
],
引导:[AppComponent]
})
导出类AppModule{}
我希望这会有帮助 我是通过基于用户权限的过滤器运行菜单项数组来实现的。
嗨,约翰,谢谢你的早期回复。但这并不能解决我的问题。实际上,我想根据用户的权限创建一个动态菜单,在angular 2中?导航栏位于app.component.html中,但我需要通过home.component.ts文件创建。“我希望你现在明白了。”下一个投票人,能解释下一个投票吗?