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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/6.2.1/rxjs.umd.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/core-js/2.5.7/core.js"/></script>
<script src="https://unpkg.com/@angular/core@6.0.5/bundles/core.umd.js"/></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/zone.js/0.8.26/zone.min.js"></script>
<script src="https://unpkg.com/@angular/common@6.0.5/bundles/common.umd.js"></script>
<script src="https://unpkg.com/@angular/compiler@6.0.5/bundles/compiler.umd.js"></script>
<script src="https://unpkg.com/@angular/platform-browser@6.0.5/bundles/platform-browser.umd.js"></script>
<script src="https://unpkg.com/@angular/platform-browser-dynamic@6.0.5/bundles/platform-browser-dynamic.umd.js"></script>
<my-app></my-app>
            
          
!
            
              @import url('https://fonts.googleapis.com/css?family=Raleway:400,500');
body {
  background-color: rgba(8, 211, 67, 0.3);
  padding: 2%;
  font-family: 'Raleway', sans-serif;
  font-size: 1em;
}
input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  font-size: 1em;
  font-family: 'Raleway', sans-serif;
  font-weight: 500;
  padding: 12px;
  border: 1px solid #ccc;
  outline-color: white;
  transition: background-color 0.5s ease;
  transition: outline-color 0.5s ease;
}
input[name=number] {
  border-bottom: 0;
}
input[name=expiry],
input[name=cvc] {
  width: 50%;
}
input[name=expiry] {
  float: left;
  border-right: 0;
}
input::placeholder {
  color: #999;
  font-weight: 400;
}
input:focus {
  background-color: rgba(130, 245, 249, 0.1);
  outline-color: #82f5f9;
}
input.is-error {
  background-color: rgba(250, 55, 55, 0.1);
}
input.is-error:focus {
  outline-color: #ffbdbd;
}
button {
  font-size: 1em;
  font-family: 'Raleway', sans-serif;
  background-color: #08d343;
  border: 0;
  box-shadow: 0px 1px 3px 1px rgba(51, 51, 51, 0.16);
  color: white;
  font-weight: 500;
  letter-spacing: 1px;
  margin-top: 30px;
  padding: 12px;
  text-transform: uppercase;
  width: 100%;
}
button:disabled {
  opacity: 0.4;
  background-color: #999999;
}
form {
  background-color: white;
  box-shadow: 0px 17px 22px 1px rgba(51, 51, 51, 0.16);
  padding: 40px;
  margin: 0 auto;
  max-width: 500px;
}
.message {
  margin-bottom: 20px;
  color: #fa3737;
}
            
          
!
            
              // app.js

const { Component, VERSION } = ng.core;
const {Subject, BehaviorSubject, combineLatest, of, from, concat, pipe} = rxjs;
const {map, merge, scan, mergeAll,  multicast, refCount, tap, startWith} = rxjs.operators;



const cleanCardNumber = map( (card) => {
  if (card) {
    return card.replace(/[\s-]/g, "");
  }
});

const expiryParts = map( (expiry) => {
  if (expiry) {
    return expiry.split("-")
  }
});

const validateCard = map( (card)=> {
    if (!card) {
        return "There is no card"
    }
    if (card.length !== 16) {
        return "There should be 16 characters in a card";
    }
});

const validateExpiry = map( (expiry) => {
    if (!expiry) {
        return "There is no expiry. Format  MM-YY";
    }
    if (expiry.length !== 2 || expiry[0].length !== 2 || expiry[1].length !== 2) {
        return "Expirty must be formatted like MM-YY";
    }
});

const validateCVC = map( (cvc) => {
  if (!cvc) {
      return "There is no CVC code";
  }
  if (cvc.length !== 3) {
      return "The CVC must be at least 3 numbers";
  }
  if (isNaN(parseInt(cvc))) {
      return "The CVC must be numbers";
  }
});

function showOnlyWhenBlurredOnce( errorObservable, blurredObservable ){
    const errorEvent = errorObservable.pipe(
        map((error) => {
            if (!error) {
                return {
                    type: "valid"
                }
            } else {
                return {
                    type: "invalid",
                    message: error
                }
            }
        })
    );

    const focusEvents = blurredObservable.pipe(
        map((isBlurred) => {
            if (isBlurred === undefined) {
                return {};
            }
            return isBlurred ? {
                type: "blurred"
            } : {
                type: "focused"
            };
        })
    );

    const valueState = scan( (previous, event) => {
        switch (event.type) {
            case "valid":
                return Object.assign({}, previous, {
                    isValid: true,
                    showCardError: false
                });
            case "invalid":
                return Object.assign({}, previous, {
                    isValid: false,
                    showCardError: previous.hasBeenBlurred
                });
            case "blurred":
                return Object.assign({}, previous, {
                    hasBeenBlurred: true,
                    showCardError: !previous.isValid
                });
            default:
                return previous;
        }
    }, {
        hasBeenBlurred: false,
        showCardError: false,
        isValid: false
    });
    var merged = errorEvent.pipe(merge(focusEvents));
    return merged.pipe( valueState ).pipe( map( state => state.showCardError ) );
}

function isCardInvalid(cardError, expiryError, cvcError){
    return combineLatest(cardError, expiryError, cvcError, function(cardError, expiryError, cvcError) {
        return !!(cardError || expiryError || cvcError)
    })
}

function combineCard(cardNumber, expiry, cvc) {
    return combineLatest(cardNumber, expiry, cvc, function(cardNumber, expiry, cvc) {
        return {cardNumber , expiry , cvc};
    })
}

function paymentPromises(payClicked, card) {
    return combineLatest(payClicked, card, (payClicked, card) => {
        if (payClicked) {
            console.log("Asking for token with", card);
            return new Promise(function(resolve) {
                setTimeout(function() {
                    resolve(1000);
                }, 2000);
            });
        }
    });
}

const paymentStatusObservable = pipe(
	map( (promise) => {
		console.log("paymentStatusObservable map", promise); 
			if (promise) {
					// STREAM<STATUS>
					var later = from(promise).pipe(
						map((value) => {
							console.log("resolved promise!")
							return {
								status: "resolved",
								value: value
							};
						})
					);

					var res = concat(
							of({
									status: "pending"
							}),
							later
					);
					return res;
			} else {
					// STREAM
					return of({
							status: "waiting"
					});
			}
	}),
	startWith([{
		status: "waiting"
	}])
);


function disablePaymentButton(isCardInvalid, paymentStatus){
	return combineLatest(isCardInvalid, paymentStatus, function(isCardInvalid, paymentStatus) {
		return (isCardInvalid === true) || !paymentStatus || paymentStatus.status === "pending";
	})
}

var log = function(name){
	return tap(ev => console.log(name, ev))
}

@Component({
  selector: 'my-app',
  template: `
   <form (submit)="pay($event)">

    <div class="message"
        *ngIf="(showCardError | async)">{{ (cardError | async) }}</div>

    <div class="message"
        *ngIf="(showExpiryError | async)">{{ (expiryError | async) }}</div>

    <div class="message"
        *ngIf="(showCVCError | async)">{{ (cvcError | async) }}</div>

    <input type="text" name="number" placeholder="Card Number"
        (input)="userCardNumber.next( $event.target.value )"
        (blur)="userCardNumberBlurred.next( true )"
        [class.is-error]="showCardError | async"/>

    <input type="text" name="expiry" placeholder="MM-YY"
        (input)="userExpiry.next( $event.target.value )"
        (blur)="userExpiryBlurred.next( true )"
        [class.is-error]="showExpiryError | async"/>

    <input type="text" name="cvc" placeholder="CVC"
        (input)="userCVC.next( $event.target.value )"
        (blur)="userCVCBlurred.next( true )"
        [class.is-error]="showCVCError | async"/>

    <button [disabled]="disablePaymentButton | async">
           {{ ( (paymentStatus | async)?.status === "pending" ) ? "Paying" : "Pay" }}
    </button>
   </form>
  `
})
class AppComponent {  
  userCardNumber = new BehaviorSubject<String>();
  userCardNumberBlurred = new Subject<Boolean>();

  userExpiry = new BehaviorSubject<Array>();
  userExpiryBlurred = new Subject<Boolean>();

  userCVC = new BehaviorSubject<String>();
  userCVCBlurred = new Subject<Boolean>();

  payClicked = new Subject();

  constructor() {
    this.cardNumber = this.userCardNumber.pipe(cleanCardNumber);
    this.cardError = this.cardNumber.pipe(validateCard);
    this.showCardError = showOnlyWhenBlurredOnce(this.cardError, this.userCardNumberBlurred);

    this.expiry = this.userExpiry.pipe(expiryParts);
    this.expiryError = this.expiry.pipe(validateExpiry);
    this.showExpiryError = showOnlyWhenBlurredOnce(this.expiryError, this.userExpiryBlurred);

    this.cvc = this.userCVC;
    this.cvcError = this.cvc.pipe(validateCVC);
    this.showCVCError = showOnlyWhenBlurredOnce(this.cvcError, this.userCVCBlurred);

    this.isCardInvalid = isCardInvalid(this.cardError, this.expiryError, this.cvcError);
	
		
    this.card = combineCard(this.cardNumber, this.expiry, this.cvc)
			.pipe(multicast(new Subject()), refCount());
		
		
    const payments = paymentPromises(this.payClicked, this.card)
			.pipe( log("payment") );
		//payments.subscribe( (data) => {console.log("subscribe payments",data)})
		
		const paymentsObservables = payments.pipe(paymentStatusObservable);
		//paymentsObservables.subscribe( (data) => {console.log("subscribe paymentsObservables",data)})
		
    this.paymentStatus = paymentsObservables.pipe( mergeAll() ).pipe(multicast(new Subject()), refCount());
		
		this.disablePaymentButton = disablePaymentButton(this.isCardInvalid, this.paymentStatus);
		
  }
  pay(event){
		console.log("PAY CLICKED");
    event.preventDefault();
    this.payClicked.next(true);  //a
		console.log("EMITTED");
  }
}

// main.js
const { BrowserModule } = ng.platformBrowser;
const { NgModule } = ng.core;
const { CommonModule } = ng.common;

@NgModule({
  imports: [
    BrowserModule,
    CommonModule,
  ],
  declarations: [AppComponent],
  bootstrap: [AppComponent],
  providers: []
})
class AppModule {}

const { platformBrowserDynamic } = ng.platformBrowserDynamic;

platformBrowserDynamic()
  .bootstrapModule(AppModule)
  .catch(err => console.error(err));
            
          
!
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