NG4-router - 2 way to implement. 1.routing within module file, 2. routing file as separate

NG4-router  - 2 way to implement. 1.routing within module file, 2. routing file as separate
===========

router we can achieve based on url change.

Method:1
--------
Write the routing in Module file it self. No need to import or create mycompoent.routing.ts file externally.
Most important = We can achieve Lazy loading using ForChild(routes)

app.module.ts
-------------
import { NgModule, ApplicationRef } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { Component1Module } from './modules/my-Componet1/Componet1.module';
import { service } from './modules/Serivice';


@NgModule({
  bootstrap: [App],
  declarations: [   App, RedirectPage   ],
 
  imports: [ // import Angular's modules
    BrowserModule,
    HttpModule,
    RouterModule,
    MyComponet1Module
],
  providers: [ // expose our Services and Providers into Angular's dependency injection
Service,
  ]
})

export class AppModule {

  constructor() {
  }
}


app.component.html
------------------

<main >
 <nav>
  <a routerLink='/first-component' >HTML</a> |
  <a routerLink='/Second-Component' >CSS</a> |
  </nav>
  <router-outlet></router-outlet>
</main>


Component1.module.ts
--------------------


const routes: Routes = [
  {
    path: 'first-component',
    component: Component1.component
  }
]
const routing = RouterModule.forChild(routes);

@NgModule({
  imports: [],
  declarations: [Component1Component],
   providers: []
   })

export class component1Module { }

Component1.Component.ts
-----------------------
import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'compare',
  templateUrl: './Component1.html',
  styleUrls: ['./Component1.scss']
})
export class Component1Component implements OnInit {

  constructor() { }

  ngOnInit() {
  }
 }


Component1.html
---------------
component1 Content comes Here...



Method:2
--------
create a Routing file for every separate module and do the routing wiht routes { path: '/compnent2, component:}
How to include multiple component into major component and display - dashboard (aggr and charts )

Same the app.module.ts , app.component.ts and app.compnent.html


Component2.module.ts
--------------------
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { routing } from './my-reports.routing';

@NgModule({
  imports: [ routing ],     // here we import routing from external routing file.
  declarations: [Component2Component],
  providers: []
   })

export class component2Module { }

Component2.routing.ts
----------------------
import { Routes, RouterModule } from '@angular/router';
import { ModuleWithProviders } from '@angular/core';
import { MyReportsComponent } from './my-reports.component';

const routes: Routes = [
  {
    path: 'Second-Component',
    component: MyReportsComponent
  }
]

export const routing: ModuleWithProviders = RouterModule.forChild(routes);


Component2.Component.ts
-----------------------
import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'compare2',
  templateUrl: './Component2.html',
  styleUrls: ['./Component2.scss']
})
export class Component2Component implements OnInit {

  constructor() { }

  ngOnInit() {
  }
 }


Component2.html
---------------
component2 Content comes Here...

Ng4- Apply Css ngClass (attribute directive) based on more than one condition( && ||)

Ng4- Apply Css ngClass (attribute directive) based on more than one condition( && ||)
===========================================================
Use case:1
----------
you can't directly use <div [ngClass]="{'cssClass1': value1 && value2,'cssClass2': value1 || value2 }"} Css effect in Template </div>
firefox browser doesn't support the && perfectly.
Use case:
----------
more than 2 condition check in with css ngClass make performance better via component function
<div [ngClass]="{'cssClass1': value1,'cssClass2': value2, 'cssClass3':value3}"} Css effect in Template </div>

Solution:
----------
Component.template.html
------------------------
<div [ngClass]="{'cssClass1': isCondtionTrue(),'cssClass2': isvalid() }"} Css effect in Template </div>

Component.component.ts
----------------------
import { component } from '@angular/component';
import { } from '@angular/route';

@Component({
  selector: 'ngClassFunction',
  templateUrl: './Component.template.html',
  styleUrls: ['./Component.template.scss'],
  encapsulation: ViewEncapsulation.None
})
export class ComponentComponent implements OnInit, OnChanges {

constructor(){
}
isCondtionTrue(){
if(this.value1 && this.value2)
return true;
else false;
}
isvalid(){
if(this.value1 && this.value2)
return true;
else false;
}

}

NG4- AOT Build failed due to Javascript Heap Out of Memory

NG4- AOT Build failed due to Javascript Heap Out of Memory 
=============================================

It will occur build memory space is less to build our Angular 2 code.
Here we are forcing to increase memory space to build.

Many thanks! Working perfectly with
node --max_old_space_size=8192 node_modules/@angular/cli/bin/ng serve --aot
Or for build
node --max_old_space_size=8192 node_modules/@angular/cli/bin/ng build -prod


Ref: https://github.com/angular/angular/issues/20687