Skip to main content

Angular 2: Multiple instances in the same Application

Von

Requirement: 

  • Use multiple Root-Components in the same Application 
  • This Root-Components use the same Implementations and Services
  • Display the Root-Components on the same Single-Page

Solution:

App-Module preparation:
 import { BrowserModule, DOCUMENT } from '@angular/platform-browser';  
 import { NgModule, Inject, Component } from '@angular/core';  

 export class AppModule {  
 private browser_document;  
  ngDoBootstrap(appRef){  
   if(this.browser_document.getElementsByTagName('app-root1').length > 0){appRef.bootstrap(AppComponent1);}  
   if(this.browser_document.getElementsByTagName('app-root2').length > 0){appRef.bootstrap(AppComponent2);}  
  }  
  constructor(@Inject(DOCUMENT) private document: any){  
   this.browser_document = document;  
  }  
 }
Service preparation:
Angular 2 has two options to provide a service.
1. Single instance
For a multiple implementation of more Root-Components we need the second option.
2. Multiple instance
Bootstrap: 
Replace the bootstrap declaration with:
 entryComponents: [  
   AppComponent1,   
   AppComponent2
 ]
Index.html:
 <html>  
 <head>  
  <title>TestApplication</title>  
  <base href="/">  
  <meta name="viewport" content="width=device-width, initial-scale=1">  
  <link rel="icon" type="image/x-icon" href="favicon.ico">  
 </head>  
 <body>  
       <app-root1>Loading...</app-root1>  
       <app-root2> Loading...</app-root2>  
 </body>  
 </html>

In cooperation with Ludwig Fischer

Labels:

Comments

Post a Comment

Popular posts from this blog

Download a file with Angular2+ and FileSaver.js

Von
Why should your Angular code download a file? Of course your webserver can deliver files and you can just add a simple link to your website but what if the file is delivered by a webservice and the webservice requests authentication (i.e. OAuth) to protect the file from unauthorized access? In this case you might have the requirement to download the file in your code and then tell the browser to save it to the hard disk. How to do that?   First of all you need to add filesaver.js to your project.  npm install file-saver --save ..and add the typings npm install @types/file-saver --save-dev More information about filesaver you can find on the filesaver github pages . To download the file via http you need to implement a service. The following imports are required: import  {  Injectable  }  from   '@angular/core' ; import  {  Http ,  Response ,  RequestOptions ,  ResponseContentType  }  from   ...
Post a Comment
Read more

How to implement a search field in Angular X that starts some action as soon as you stop typing

Von
Everybody knows the Google search that displays some recommendations while you are typing. Some times when you are developing an application you might need a similar functionality for implementing a kind of free text search to quickly find results in a long list of data stored in a database that might be filtered and delivered by a webservice in the background.  The requirement: The search should happen without clicking a button but it should not start right after each single character you have typed. It should wait a short moment and after you have stopped typing immediately start the search. The implementation is quite simple and the same way you could do that in Javascript. First we need to prepare our template to have an input field in which the user can type in a search string.  Whenever the user types a character a function should be called. This is done with the keyup event. (keyup)="searchChanged($event)" In our component we have to defin...
Post a Comment
Read more