Best method to set different layout for different pages in angular 4

Question

I am new to angular 4. What I\'m trying to achieve is to set different layout headers and footers for different pages in my app. I have three different cases:

Answer 1

There are cases where the layout and shared elements don't really match the routing structure, or some elements have to be hidden/shown depending on a per-route basis. For such cases I can think of the following strategies (let's take an example of app-header-main component - but it will apply to any shared page element obviously):

Inputs & css classes

You can provide inputs or css classes to control the inner appearance of your shared elements, such as:

1. <app-header-main [showUserTools]="false"></app-header-main>

or

2. <app-header-main class="no-user-tools"></app-header-main> and then use :host(.no-user-tools) to show/hide what needs to be

or

3. at a route level (child or not):

   {
     path: 'home',
     component: HomeComponent,
     data: {
       header: {showUserTools: true},
     },
   },
   

And access it through ActivatedRoute like so: this.route.data.header.showUserTools

TemplateRef input

Inside app-header-main component:

@Input() rightSide: TemplateRef<any>;

Input of type TemplateRef<any> where you could feed an ng-template element directly

<app-header-main [rightSide]="rightside"></app-header-main>
<ng-template #rightside>your content here</ng-template>

Named slot transclusion

You can author the app-header-main so that it uses named slot transclusion

Inside of app-header-main template:

<ng-content select="[rightSide]"><ng-content>

Usage:

<app-header-main class="no-user-tools">
  <div rightSide>your content here</div>
</app-header-main>

Answer 2

You can solve the problem using ng-content + ViewChild injection of layout into each page component that uses that specific layout.

Using the router for this common use case always seemed like a workaround to me. What you want is similar to Layouts in Asp.Net MVC or MasterPages in WebForm etc.

After struggling with this I ended up with something like this:

see working demo: https://stackblitz.com/edit/angular-yrul9f

shared.component-layout.ts

import { Component } from '@angular/core';

@Component({
  selector: 'shared-component-layout',
  template: `
  <div *ngIf="!hideLayoutHeader" style="font-size: 2rem;margin-bottom: 10px;">
    Layout title: {{layoutHeader}}
    <ng-content select=".layout-header">    
    </ng-content>
  </div>
  <ng-content select=".layout-body">
  </ng-content>
  `
})
export class SharedComponentLayout {
  layoutHeader: string;
  hideLayoutHeader: boolean;
}

page.component-base.ts

import { Component, ViewChild } from '@angular/core';
import { SharedComponentLayout } from './shared.component-layout';

export abstract class PageComponentBase {
    @ViewChild('layout') protected layout: SharedComponentLayout;
}

login.component.ts - without header

import { Component } from '@angular/core';
import { PageComponentBase } from './page.component-base';

@Component({
  selector: 'login-component',
  template: `
  <shared-component-layout #layout>
    <div class="layout-body">
      LOGIN BODY
    </div>
  </shared-component-layout>
  `
})
export class LoginComponent extends PageComponentBase {

  ngOnInit() {
    this.layout.hideLayoutHeader = true;    
  }
}

home.component.ts - with header

import { Component } from '@angular/core';
import { PageComponentBase } from './page.component-base';

@Component({
  selector: 'home-component',
  template: `
  <shared-component-layout #layout>
    <div class="layout-body">
      HOME BODY
    </div>
  </shared-component-layout>
  `
})
export class HomeComponent extends PageComponentBase {

  ngOnInit() {    
    this.layout.layoutHeader = 'Home component header';
  }
}

Answer 3

you can use child e.g.

const appRoutes: Routes = [
    { path: '', component: MainComponent,
        children:{
            { path: 'home'  component:HomeComponent},
            { path: 'about', component: AboutComponent},
            { path: 'contact', component: ContactComponent},
               ..others that share the same footer and header...

        }
    },
    { path: 'login', component: LoginComponent },
    { path: 'register', component: RegisterComponent },
    { path: 'admin', component:AdminComponent, 
         children{
            { path: 'dashboard', component: DashboardComponent },
            { path: 'profile', component: ProfileComponent }
               ..others that share the same footer and header...
         }
    }
    { path: '**', redirectTo: '' }
];

MainComponent and AdminComponent like

<app-header-main></app-header-main>
<router-outlet></router-outlet>
<app-footer-main></app-footer-main>

the post talk about separate in diferent files the routes

Answer 4

You can solve your problem using child routes.

See working demo at https://angular-multi-layout-example.stackblitz.io/ or edit at https://stackblitz.com/edit/angular-multi-layout-example

Set your route like below

const appRoutes: Routes = [
    
    // Site routes goes here 
    { 
        path: '', 
        component: SiteLayoutComponent,
        children: [
          { path: '', component: HomeComponent, pathMatch: 'full'},
          { path: 'about', component: AboutComponent }
        ]
    },
    
    // App routes goes here
    { 
        path: '',
        component: AppLayoutComponent, 
        children: [
          { path: 'dashboard', component: DashboardComponent },
          { path: 'profile', component: ProfileComponent }
        ]
    },

    // no layout routes
    { path: 'login', component: LoginComponent},
    { path: 'register', component: RegisterComponent },
    // otherwise redirect to home
    { path: '**', redirectTo: '' }
];

export const routing = RouterModule.forRoot(appRoutes);