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Angular 5 - Custom Directives,Pipes - Promise And Observables

Live app is at http://vasudevkumaran.com/shopping

Username: v.dev
Passwrod: 12345678

app.component.html

<div class="container">
    <div class="row">

        <div class="col-md-12 header">

        </div>

    </div>
    <div class="row">
        <div class="col-md-3 leftNav">

            <ul class="list-group">
                <a class="list-group-item" routerLink="home" routerLinkActive="active">Home</a>

                <a class="list-group-item" routerLink="register" routerLinkActive="active" *appDevHide="userObj.status == ‘OK’">Register</a>
            </ul>
            {{message}}

        </div>
        <div class="col-md-9 mainBar">
            <router-outlet></router-outlet>

        </div>

    </div>

    <div class="row">

        <div class="col-md-12 footerBar">Footer</div>
    </div>

</div>

app.component.ts

import { Component} from ‘@angular/core’;
import { OnInit, OnDestroy } from ‘@angular/core/src/metadata/lifecycle_hooks’;
import { AppService } from ‘./app.service’;
import { Subscription } from ‘rxjs/Subscription’;

@Component({
  selector: ‘app-root’,
  templateUrl: ‘./app.component.html’,
  styleUrls: [’./app.component.css’]
})
export class AppComponent implements OnInit, OnDestroy{
  public title:string = ‘app’;
  message:string = "hello";
  public userObj = {‘status’:‘FAILED’};
  private sub:Subscription;

  constructor(private service:AppService){
    console.log("App Component Constructor called");
    this.service.setParentInstance(this);
    this.userObj = this.service.getLogin();
    this.sub = this.service.getObservable().subscribe(data=>{
      this.message = data;
      
    });
  }

  public ngOnInit(){
    console.log("App Component init called");
  }

  public ngOnDestroy(){
    console.log("App Component destroy called");
    this.sub.unsubscribe();
  }

}

app.module.ts

import { BrowserModule } from ‘@angular/platform-browser’;
import { NgModule } from ‘@angular/core’;
import { RouterModule, Routes} from ‘@angular/router’
import { HttpClientModule } from ‘@angular/common/http’
import { FormsModule} from ‘@angular/forms’
import { HttpModule } from ‘@angular/http’

import { AppComponent } from ‘./app.component’;
import { HomeComponent } from ‘./home/home.component’;
import { RegisterComponent } from ‘./register/register.component’;
import { NotFoundComponent } from ‘./not-found/not-found.component’;
import { AppService } from ‘./app.service’;
import { LoginComponent } from ‘./login/login.component’;
import { AddComponent } from ‘./add/add.component’;
import { DevHideDirective } from ‘./dev-hide.directive’;
import { DevExpPipe } from ‘./dev-exp.pipe’;

const r:Routes = [
  {path:’‘, redirectTo:‘home’, pathMatch:‘full’},
  {path:‘home’,component:HomeComponent},
  {path:‘register’,component:RegisterComponent},
  {path:’**’,component:NotFoundComponent}
];

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent,
    RegisterComponent,
    NotFoundComponent,
    LoginComponent,
    AddComponent,
    DevHideDirective,
    DevExpPipe
  ],
  imports: [
    BrowserModule,
    HttpModule,
    HttpClientModule,FormsModule,RouterModule.forRoot(r)
  ],
  providers: [AppService],
  bootstrap: [AppComponent]
})
export class AppModule { }

app.service.ts

import { Injectable } from ‘@angular/core’;
import { HttpClient, HttpHeaders } from ‘@angular/common/http’;
import { Http, Headers} from ‘@angular/http’;
import { Observable } from ‘rxjs/Observable’;
import { RequestOptions } from ‘@angular/http’;
import { AppComponent } from ‘./app.component’;

const URL:string = "http://vasudevkumaran.com/ang/";
@Injectable()
export class AppService {

  private parent:AppComponent;
  
  constructor(private httpClient:HttpClient, private http:Http) { }

  public sendData(path:string,payload:any):Observable<any>{
    var headerParams:HttpHeaders = new HttpHeaders();
    headerParams.append(‘Content-Type’,‘application/json’);
    return this.httpClient.post(URL+path,payload,{headers:headerParams});
  }

  public getObservable():Observable<any>{
    
    var obs = new Observable(obsObject=>{
      setInterval(_=>{
        obsObject.next(Math.random());
      },1000);
      //obsObject.complete();
    });

    return obs;
  }

  public setParentInstance(parentObj){
    this.parent = parentObj;
  }

  private dirtyCodeToSendToParent(parent:AppComponent){

  }

  public sendDataAsPromise(path:string,payload:any){
    var headerObj = new Headers();
    headerObj.append(‘Content-Type’,‘application/json’);
    var reqOpt:RequestOptions = new RequestOptions();
    reqOpt.headers = headerObj;
    return this.http.post(URL+path,payload,reqOpt).toPromise();
  }

  public clearLogin(){
    localStorage.removeItem(‘login’);
    var loginObj = this.getLogin();
    if (this.parent){
      this.parent.userObj = loginObj;
    }
    return loginObj;
  }

  public setLogin(obj:any){
    localStorage.login = JSON.stringify(obj);
    if (this.parent){
      this.parent.userObj = this.getLogin();
    }
  }

  public getLogin():any{
    var obj = {status:‘FAILED’,data:{}};
    if (localStorage.login){
      obj.status = ‘OK’;
      obj.data = JSON.parse(localStorage.login);
    }

    return obj;
  }

}

dev-hide.directive.ts

import { Directive } from ‘@angular/core’;
import { TemplateRef,ViewContainerRef } from ‘@angular/core’;
import { Input } from ‘@angular/core’;

@Directive({
  selector: ‘[appDevHide]’
})
export class DevHideDirective {
  
  private hasView = false;
  constructor(private templateRef:TemplateRef<any>,private viewRef:ViewContainerRef) { 

    
  }

  @Input() set appDevHide(condition:boolean){
       if (this.hasView && condition){
         this.viewRef.clear();
         this.hasView = false;
       }else if (!this.hasView && !condition){
         this.viewRef.createEmbeddedView(this.templateRef);
         this.hasView = true;
       }
  }

}

dev-exp.directive.ts

import { Pipe, PipeTransform } from ‘@angular/core’;

@Pipe({
  name: ‘devExp’
})
export class DevExpPipe implements PipeTransform {
  //2 => 2*50/100
  transform(value: any, args?: any): any {
    var vn = parseInt(value);
    return args+’% of ‘+value+’ is ‘+vn*args/100;
  }

}

home.component.html

<div class="row">
    <div class="col-md-8">
        Hi {{user.user_full_name}};
        <ng-container *ngIf="loginObj.status == ‘OK’">
            <app-add></app-add>
        </ng-container>

    </div>
    <div class="col-md-4">

        <div class="rightNav" *ngIf="loginObj.status != ‘OK’">
            <app-login [titleName]="‘Registration’" (onReceiveResult)="onGetResultFromChild($event)"></app-login>
        </div>
        <div class="pull-right" *ngIf="loginObj.status == ‘OK’">
            <button class="btn btn-danger" (click)="onLogout()">Logout</button>
        </div>

    </div>
</div>

home.component.ts

import { Component, OnInit } from ‘@angular/core’;
import { OnDestroy, AfterViewInit } from ‘@angular/core/src/metadata/lifecycle_hooks’;
import { NgForm } from ‘@angular/forms’;
import { Title } from ‘@angular/platform-browser’;
import { ActivatedRoute } from ‘@angular/router’;
import { Router } from ‘@angular/router’;
import { AppService } from ‘../app.service’;
import { Output } from ‘@angular/core/src/metadata/directives’;
@Component({
  selector: ‘app-home’,
  templateUrl: ‘./home.component.html’,
  styleUrls: [’./home.component.css’]
})
export class HomeComponent implements OnInit , OnDestroy, AfterViewInit{
  public user:any = {};
  public message:string = "Hello this is Home page";
  public formdata:string = "";
  public gender:Array<String> = ["Male","Female","Other"];
  public selectedGender = "Female";
  public choice:any = {movies:true,travel:true};
  public loginObj:any = {};
  
  constructor(private pageTitle:Title, private router:Router, private service:AppService) { 
    this.pageTitle.setTitle("Home");
    console.log("Home constructor called");
    this.loginObj = this.service.getLogin();
    if (this.loginObj.status == ‘OK’){
      this.user = this.loginObj.data;
    }
    
  }

  ngOnInit() {
    console.log("Home init called");
    
  }

  ngOnDestroy(){
    console.log("Home destroy called");
  }

  ngAfterViewInit(){
    console.log("Home after init called");
  
    
  }

  public onButtonPressed(){
    this.message = "Hi this message got changed";
  }

  public onDropDownChanged(){

  }

  public onFormSumbit(){
    console.log("Form submitted");
    console.log(this.choice);
  }

  public onGetResultFromChild(payload:any){
    console.log(payload);
    if (payload.result == ‘OK’){
        this.user = payload.data[0];
        this.service.setLogin(this.user);
        this.loginObj = this.service.getLogin();
    }else{
        this.user = payload.message;
    }

    //this.router.navigate([‘register’]);

  }

  public onLogout(){
      this.loginObj = this.service.clearLogin();
      this.user = {};
  }

}

add.component.html

<div class="row">
    <div class="col-md-12">
        <form class="form-inline" (ngSubmit)="onSaveForm()">
            <div class="form-group">
                <input type="text" name="itemname" class="form-control" id="itemname" placeholder="Item Name" [(ngModel)]="item.itemname">
            </div>
            <div class="form-group">

                <input type="text" name="itemqty" class="form-control" id="itemqty" placeholder="Item Qty" [(ngModel)]="item.itemqty">
            </div>
            <div class="form-group">

                <input type="text" name="itemprice" class="form-control" id="itemprice" placeholder="Item Price" [(ngModel)]="item.itemprice">
            </div>
            <button type="submit" class="btn btn-info" style="margin: 5px;">Save</button>
        </form>
    </div>
    <div class="col-md-12">
        <table class="table table-bordered">
            <tr>
                <th>Sl</th>
                <th>Item</th>
                <th>Price</th>
                <th>Qty</th>
                <th>Edit</th>
                <th>Remove</th>
            </tr>
            <tr *ngFor="let itemObj of items;let i = index">
                <td>{{i+1}}</td>
                <ng-container *ngIf="itemObj.isBeingEdited; then isedit else noedit">

                </ng-container>

                <ng-template #noedit>
                    <td>{{itemObj.item_name | uppercase}}</td>
                    <td>{{itemObj.item_price | devExp:25}}</td>
                    <td>{{itemObj.item_qty}}</td>
                </ng-template>
                <ng-template #isedit>
                    <td><input type="text" class="form-control" [name]="itemObj.item_name" [(ngModel)]="itemObj.item_name"></td>
                    <td><input type="text" class="form-control" [name]="itemObj.item_price" [(ngModel)]="itemObj.item_price"></td>
                    <td><input type="text" class="form-control" [name]="itemObj.item_qty" [(ngModel)]="itemObj.item_qty"></td>
                </ng-template>

                <td><button class="btn btn-warning" (click)="onEditPressed(itemObj)">Edit</button></td>
                <td><button class="btn btn-danger" (click)="onDeletePressed(itemObj,i)">Delete</button></td>
            </tr>
        </table>
    </div>

</div>

add.component.ts

import { Component, OnInit } from ‘@angular/core’;
import { AppService } from ‘../app.service’;
import { OnDestroy } from ‘@angular/core’;
import { Title } from ‘@angular/platform-browser’;
import { Subscription } from ‘rxjs/Subscription’;

@Component({
  selector: ‘app-add’,
  templateUrl: ‘./add.component.html’,
  styleUrls: [’./add.component.css’]
})
export class AddComponent implements OnInit,OnDestroy {

  public items:Array<any> = [];
  public item:any = {};
  private loadSub:Subscription;
  private addSub:Subscription;
  constructor(private title:Title,private service:AppService) { 
    this.title.setTitle("Manage Items");
  }

  ngOnInit() {
    
    this.loadItems();
  }

  ngOnDestroy(){

  }

  private loadItems(){
    var user = this.service.getLogin().data;
    var payload:any = {};
    payload.username = user.user_name;
    payload.password = user.user_password;
    
    
    this.loadSub = this.service.sendData(‘getallitems’,payload).subscribe(data => {
      //console.log(data);
      if (data.result == ‘OK’){
        this.items = data.items;
        console.log(this.items);
        
      }
      this.loadSub.unsubscribe();
    });
  }

  public onSaveForm(){
    var user = this.service.getLogin().data;
    
    this.item.username = user.user_name;
    this.item.password = user.user_password;
    this.addSub = this.service.sendData(‘additem’,this.item).subscribe(data => {
      console.log(data);
      if (data.result == ‘OK’){
        this.item = {};
        this.loadItems();
      }
      this.addSub.unsubscribe();
    });
  }

  public onEditPressed(obj){
    if (obj.isBeingEdited){
      var user = this.service.getLogin().data;
      var payload:any = {};
      payload.username = user.user_name;
      payload.password = user.user_password;
      payload.itemid = obj.item_id;
      payload.itemname = obj.item_name;
      payload.itemqty = obj.item_qty;
      payload.itemprice = obj.item_price;
      this.service.sendData(‘updateitem’,payload).subscribe(data=>{
        console.log(data);
      });
      obj.isBeingEdited = false;
    }else{
      obj.isBeingEdited = true;
    }
    
  }

  public onDeletePressed(obj,index){
    var user = this.service.getLogin().data;
      var payload:any = {};
      payload.username = user.user_name;
      payload.password = user.user_password;
      payload.itemid = obj.item_id;
      this.service.sendData(‘deleteitem’,payload).subscribe(data=>{
        console.log(data);
      });
      this.items.splice(index,1);
  }

}

login.component.html

<div style="padding: 10px">
    <div class="col-md-12">
        <form (ngSubmit)="onClickLogin()">
            <h4>{{titleName}}!!</h4>
            <div class="form-group">
                <label>Username</label>
                <input type="text" class="form-control" name="username" [(ngModel)]="login.username">
            </div>
            <div class="form-group">
                <label>Password</label>
                <input type="password" class="form-control" name="password" [(ngModel)]="login.password">
            </div>
            <button type="submit" class="btn btn-danger">Login</button>

        </form>

    </div>
</div>

login.component.ts

import { Component, OnInit } from ‘@angular/core’;
import { AppService } from ‘../app.service’;
import { Input } from ‘@angular/core’;
import { Output } from ‘@angular/core’;
import { EventEmitter } from ‘@angular/core’;

@Component({
  selector: ‘app-login’,
  templateUrl: ‘./login.component.html’,
  styleUrls: [’./login.component.css’]
})
export class LoginComponent implements OnInit {

  public login:any = {};
  @Input() titleName:string;
  @Output() onReceiveResult = new EventEmitter<any>();

  constructor(private service:AppService) { }

  ngOnInit() {

  }

  onClickLogin(){
    //console.log(this.login);
    /*
    this.service.sendData(‘login’,this.login).subscribe(data=>{
        //console.log(data);
        this.onReceiveResult.emit(data);
    });
    */
    this.service.sendDataAsPromise(‘login’,this.login).then(data => {
      console.log(data.json());
      this.onReceiveResult.emit(data.json());
    });
    

    
  }

}

register.component.html

<form (ngSubmit)="onRegisterPressed()" #regForm="ngForm">
    <div class="form-group">
        <label>First name</label>
        <input type="text" class="form-control" name="firstname" [(ngModel)]="user.firstname" placeholder="Enter First name" required>

    </div>
    <div class="form-group">
        <label>Last name</label>
        <input type="text" class="form-control" name="lastname" [(ngModel)]="user.lastname" placeholder="Enter Last name" required>
    </div>
    <div class="form-group">
        <label>Username</label>
        <input type="text" class="form-control" name="username" [(ngModel)]="user.username" placeholder="Enter Username" required>
    </div>
    <div class="form-group">
        <label>Password</label>
        <input type="password" class="form-control" name="password" [(ngModel)]="user.password" placeholder="Enter Password" required>
    </div>
    <div style="margin-top: 10px">
        <label>Gender</label>
    </div>

    <label class="radio-inline"><input type="radio" name="gender" [(ngModel)]="user.gender" value="1" style="margin-top:-5px"> Male</label>
    <label class="radio-inline"><input type="radio" name="gender" [(ngModel)]="user.gender" value="2" style="margin-top:-5px"> Female</label>

    <div>

    </div>
    <div style="margin-top: 10px">
        <label>Area of Interest</label>
    </div>
    <div class="checkbox">
        <label><input type="checkbox" name="is_business" [(ngModel)]="isBusiness" style="margin-top:-5px"> Business</label>
    </div>
    <div class="checkbox">
        <label><input type="checkbox" name="is_travel" [(ngModel)]="isTravel" style="margin-top:-5px"> Travel</label>
    </div>
    <div class="checkbox">
        <label><input type="checkbox" name="is_holidays" [(ngModel)]="isHolidays" style="margin-top:-5px"> Holidays</label>
    </div>

    <div>
        <button type="submit" class="btn  btn-success" [disabled]="!regForm.form.valid">Register</button>
    </div>

</form>

register.component.ts

import { Component, OnInit } from ‘@angular/core’;
import { OnDestroy, AfterViewInit } from ‘@angular/core/src/metadata/lifecycle_hooks’;
import { AppService } from ‘../app.service’;
import { Title } from ‘@angular/platform-browser’;
import { Subscription } from ‘rxjs/Subscription’;

@Component({
  selector: ‘app-register’,
  templateUrl: ‘./register.component.html’,
  styleUrls: [’./register.component.css’]
})
export class RegisterComponent implements OnInit, OnDestroy, AfterViewInit {
  public user:any = {gender:"2"};
  public isBusiness = false;
  public isTravel = false;
  public isHolidays = false;
  private regSub:Subscription;
  
  constructor(private service:AppService, private pageTitle:Title) { 
    this.pageTitle.setTitle("Register");
    console.log("Register constructor called");
    
  }

  ngOnInit() {
    console.log("Register init called");
  }

  ngOnDestroy(){
    console.log("Register destroy called");
    if (this.regSub){
      this.regSub.unsubscribe();
    }
  }

  ngAfterViewInit(){
    console.log("Register after init called");
  }

  public onRegisterPressed(){
    
    
    this.user.is_business = 2;
    this.user.is_travel = 2;
    this.user.is_holidays = 2;
    if (this.isBusiness){
      this.user.is_business = 1;
    }
    if (this.isHolidays){
      this.user.is_holidays = 1;
    }
    if (this.isTravel){
      this.user.is_travel = 1;
    }

    console.log(this.user);

    this.regSub = this.service.sendData(‘registration’,this.user).subscribe(data =>{
      console.log(data);

      if (data.result == ‘OK’){
        window.alert("Successfully registered");
        this.user = {gender:"2"};
      }else{
        window.alert(data.message);
      }
     
    });
  }

}

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26) JQuery Mobile - IndexedDB Addon
2016-01-11 00:08:42
27) Students Record - JQuery Mobile App
2016-01-09 04:03:04
28) JQuery Mobile PageChange Event
2016-01-08 03:51:55
29) Beginning JQuery Mobile
2016-01-07 03:47:24
30) WebWorker Example
2016-01-06 04:11:18
31) IndexedDB - ObjectStore - Tansaction - Cursor - Part 2
2016-01-05 03:46:35
32) Student Record - IndexedDB Migration
2016-01-04 23:47:55
33) IndexedDB - ObjectStore - Tansaction - Cursor
2016-01-04 04:48:33
34) Single Page Design And Geolocation Example With Ajax
2016-01-03 23:39:19
35) Drag And Drop Example
2016-01-03 01:57:50
36) Beginning Responsive WebDesign Using JQuery
2016-01-03 01:56:17
37) HTML5 Canvas Simple Example
2016-01-03 01:55:11
38) JQuery Object - Context - Function Callbacks
2015-12-29 23:28:49
39) JQuery DOM Manipulation And LocalStorage
2015-11-30 23:50:59
40) JavaScript EventListeners
2015-11-30 04:34:08
41) MultiPage Design
2015-11-28 03:02:52
42) HTML Box Design
2015-07-03 03:09:55
43) KO Custom Component
2015-07-02 23:25:36
44) KO Custom Binding And Template Binding
2015-07-01 23:27:04
45) KO Simplelist
2015-07-01 01:44:40
46) KO Introduction And JQuery Simple List
2015-01-29 00:34:17
47) Canvas - DragDrop - Video - Audio Example
2015-01-28 03:57:05
48) CSS Media Type - IndexedDB WHERE And LIKE Clause
2015-01-27 02:24:12
49) IndexedDB Simple Example
2015-01-24 00:11:32
50) Students Record - JQueryMobile - GeoLocation - Ajax Addon
2015-01-24 00:08:19
51) GeoLocation And Ajax Example
2015-01-21 05:23:32
52) Students Record - JQueryMobile - SessionStorage - Login State
2015-01-19 23:33:29
53) JQueryMobile - Page Change - Popup Addon
2015-01-19 00:21:28
54) JQueryMobile - Data-Role Introduction
2015-01-17 03:22:07
55) Handle PageLinks
2015-01-16 04:28:20
56) Simple HTML5 Calculator
2015-01-16 03:03:45
57) Load External DOM - Ajax In Simple Way
2015-01-16 03:01:48
58) JQuery Document Ready - Placement Of Script Tag
2015-01-13 22:54:25
59) Dynamic Layout Technique Using JQuery
2015-01-13 04:04:19
60) JQuery - Introduction
2015-01-12 23:45:02
61) LocalStorage - CRUD
2015-01-12 00:06:03
62) JSON - LocalStorage Example
2015-01-11 22:47:24
63) JavaScript - Data Persistency Using LocalStorage - SessionStorage
2015-01-10 03:17:01
64) HTML - JavaScript - Dynamic Table
2015-01-10 00:32:26
65) JavaScript Introduction
2015-01-09 04:07:47
66) CSS - Continued
2015-01-08 03:26:39
67) CSS - Margin - Padding - HTML5 Semantic Elements
2015-01-07 22:44:01
68) HTML-CSS Introduction
2014-11-25 14:27:00
69) Angular JS Simple Example
2014-10-16 05:01:39
70) CSS Media Example - Different CSS For Desktop - Tablet - Phone Screen Sizes
2014-10-15 04:20:11
71) Miscellaneous In Addition To Previous Exercises
2014-10-15 04:13:45
72) Some Useful RegEx
2014-10-14 02:57:45
73) Shopping List App Using IndexedDB
2014-10-14 00:04:10
74) IndexedDB Introduction
2014-10-14 00:00:01
75) JavaScript Prototyping
2014-10-11 03:50:47
76) Introduction To Canvas Drawing - Tabs - Popup Warning Dialog
2014-10-11 00:03:50
77) Popup - Validation - Shopping List App Updated
2014-10-10 22:34:42
78) RegEx Pattern For Validation - Shopping List App
2014-10-10 05:12:13
79) Password Lock-Shopping List App
2014-10-09 22:49:34
80) JQuery Shopping - Updated
2014-10-09 05:10:00
81) JQuery Mobile Forms - Save Checkbox - Radio Button Checked States
2014-10-08 22:18:40
82) JQuery Mobile Forms - Additional Data-role Attribute Values
2014-10-08 02:17:48
83) JQuery Shopping List Alternate Approach. JQ Append & Pagechange
2014-10-07 03:02:43
84) JQuery Mobile Page Change Events
2014-10-06 02:19:53
85) JQuery Mobile Data- Attribute Reference
2014-10-06 00:13:01
86) Shopping List Using LocalStorage
2014-10-06 00:10:02
87) JQuery Mobile Introduction
2014-10-06 00:07:40
88) JQuery Page Loading Technique
2014-10-06 00:05:39
89) Mobile Ready Page Extended - Load Multiple Pages Using JQuery
2014-10-06 00:00:27
90) A Mobile First Design Using JQuery - Window-Size
2014-10-05 23:58:01
91) JavaScript Array - Create - Update - Delete
2014-10-05 23:55:43
92) JQuery CSS Capabilities - A Mobile Ready Page
2014-10-05 23:52:42
93) JQuery Introduction - Unit Conversion Using JQuery
2014-10-05 23:49:58
94) JavaScript - DOM Manipulation-Table-Calculator
2014-10-05 23:40:06
95) GeoLocation
2014-10-05 23:37:36
96) Margin And Border Radius
2014-10-05 23:34:06
97) HTML5 Semantic Elements, CSS,SVG Examples
2014-10-05 23:28:45
98) HTML,CSS Selectors

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