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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.

HTML

              
                <cc-payment></cc-payment>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Raleway:400,500');


@font-family: 'Raleway', sans-serif;
@font-size: 1em;
@color-accent: #08d343;
@color-disabled: #999;
@color-error: #fa3737;
@color-focus: #82f5f9;
@color-focus-outline: #ffbdbd;
@padding-vertical: 12px;

body {
  background-color: fade(@color-accent, 30%);
  padding: 2%;
  font-family: @font-family;
  font-size: @font-size;
}

input {
  display: block;
  width: 100%;
  box-sizing: border-box;
  font-size: @font-size;
  font-family: @font-family;
  font-weight: 500;
  padding: @padding-vertical;
  border: 1px solid #ccc;
  outline-color: white;
  transition: background-color 0.5s ease;
  transition: outline-color 0.5s ease;
  &[name=number]{
    border-bottom: 0;
  }
  &[name=expiry], 
  &[name=cvc] {
    width: 50%;
  }
  &[name=expiry] {
    float: left;
    border-right: 0;
  }
  &::placeholder {
    color: #999;
    font-weight: 400;
  }
  &:focus {
    background-color: fade(@color-focus, 10%);
    outline-color: @color-focus;
  }
  &.is-error {
    background-color: fade(@color-error, 10%);
    &:focus {
      outline-color: @color-focus-outline;
    }
  }
}

button {
  font-size: @font-size;
  font-family: @font-family;
  background-color: @color-accent;
  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: @padding-vertical;
  text-transform: uppercase;
  width: 100%;
  &:disabled {
    opacity: 0.4;
    background-color: @color-disabled;
  }
}

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: @color-error;
}
              
            
!

JS

              
                import { kefir as Kefir, StacheElement } from "//unpkg.com/can@pre/ecosystem.mjs";

class CCPayment extends StacheElement {
	static view = `
		<form on:submit="this.pay(scope.event)">
			{{# if(this.showCardError.value) }}
				<div class="message">{{ this.cardError.value }}</div>
			{{/ if }}

			{{# if(this.showExpiryError.value) }}
				<div class="message">{{ this.expiryError.value }}</div>
			{{/ if }}

			{{# if(this.showCVCError.value) }}
				<div class="message">{{ this.cvcError.value }}</div>
			{{/ if }}

			<input type="text" name="number" placeholder="Card Number"
					on:input:value:to="this.userCardNumber.value"
					on:blur="this.userCardNumberBlurred.emitter.value(true)"
					{{# if(this.showCardError.value) }}class="is-error"{{/ if }}>

			<input type="text" name="expiry" placeholder="MM-YY"
					on:input:value:to="this.userExpiry.value"
					on:blur="this.userExpiryBlurred.emitter.value(true)"
					{{# if(this.showExpiryError.value) }}class="is-error"{{/ if }}>
	
			<input type="text" name="cvc" placeholder="CVC"
					on:input:value:to="this.userCVC.value"
					on:blur="this.userCVCBlurred.emitter.value(true)"
					{{# if(this.showCVCError.value) }}class="is-error"{{/ if }}>

			<button disabled:from="this.disablePaymentButton.value">
				{{# eq(this.paymentStatus.value.status, "pending") }}Paying{{ else }}Pay{{/ eq }} \${{ this.amount.value }}
			</button>
		</form>
  `;

	static props = {
		amount: {
			get default() {
				return Kefir.constant(1000);
			}
		},

		userCardNumber: {
			get default() {
				return Kefir.emitterProperty();
			}
		},

		userCardNumberBlurred: {
			get default() {
				return Kefir.emitterProperty();
			}
		},

		userExpiry: {
			get default() {
				return Kefir.emitterProperty();
			}
		},

		userExpiryBlurred: {
			get default() {
				return Kefir.emitterProperty();
			}
		},

		userCVC: {
			get default() {
				return Kefir.emitterProperty();
			}
		},

		userCVCBlurred: {
			get default() {
				return Kefir.emitterProperty();
			}
		},

		payClicked: {
			get default() {
				return Kefir.emitterProperty();
			}
		},

		get cardNumber() {
			return this.userCardNumber.map(card => {
				if (card) {
					return card.replace(/[\s-]/g, "");
				}
			});
		},

		get cardError() {
			return this.cardNumber.map(this.validateCard);
		},

		get showCardError() {
			return this.showOnlyWhenBlurredOnce(
				this.cardError,
				this.userCardNumberBlurred
			);
		},

		// EXPIRY
		get expiry() {
			return this.userExpiry.map(expiry => {
				if (expiry) {
					return expiry.split("-");
				}
			});
		},

		get expiryError() {
			return this.expiry.map(this.validateExpiry).toProperty();
		},

		get showExpiryError() {
			return this.showOnlyWhenBlurredOnce(
				this.expiryError,
				this.userExpiryBlurred
			);
		},

		// CVC
		get cvc() {
			return this.userCVC;
		},

		get cvcError() {
			return this.cvc.map(this.validateCVC).toProperty();
		},

		get showCVCError() {
			return this.showOnlyWhenBlurredOnce(this.cvcError, this.userCVCBlurred);
		},

		get isCardInvalid() {
			return Kefir.combine(
				[this.cardError, this.expiryError, this.cvcError],
				(cardError, expiryError, cvcError) => {
					return !!(cardError || expiryError || cvcError);
				}
			);
		},

		get card() {
			return Kefir.combine(
				[this.cardNumber, this.expiry, this.cvc],
				(cardNumber, expiry, cvc) => {
					return { cardNumber, expiry, cvc };
				}
			);
		},

		// STREAM< Promise<Number> | undefined >
		get paymentPromises() {
			return Kefir.combine(
				[this.payClicked],
				[this.card],
				(payClicked, card) => {
					if (payClicked) {
						console.log("Asking for token with", card);
						return new Promise(resolve => {
							setTimeout(() => {
								resolve(1000);
							}, 2000);
						});
					}
				}
			);
		},

		// STREAM< STREAM<STATUS> >
		// This is a stream of streams of status objects.
		get paymentStatusStream() {
			return this.paymentPromises.map(promise => {
				if (promise) {
					// STREAM<STATUS>
					return Kefir.concat([
						Kefir.constant({
							status: "pending"
						}),
						Kefir.fromPromise(promise).map(value => {
							return {
								status: "resolved",
								value: value
							};
						})
					]);
				} else {
					// STREAM
					return Kefir.constant({
						status: "waiting"
					});
				}
			});
		},

		// STREAM<STATUS> //{status: "waiting"} | {status: "resolved"}
		get paymentStatus() {
			return this.paymentStatusStream.flatMap().toProperty();
		},

		get disablePaymentButton() {
			return Kefir.combine(
				[this.isCardInvalid, this.paymentStatus],
				(isCardInvalid, paymentStatus) => {
					return (
						isCardInvalid === true ||
						!paymentStatus ||
						paymentStatus.status === "pending"
					);
				}
			).toProperty(() => {
				return true;
			});
		}
	};

	pay(event) {
		event.preventDefault();
		this.payClicked.emitter.value(true);
	}

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

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

	validateCVC(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";
		}
	}

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

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

		return Kefir.merge([errorEvent, focusEvents])
			.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
				}
			)
			.map(state => {
				return state.showCardError;
			});
	}
}

customElements.define("cc-payment", CCPayment);

              
            
!
999px

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