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January 23, 2025 20:06
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Ecommerce Platform</title> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <style type="text/css"> | |
| body { | |
| margin: 1em auto; | |
| max-width: 40em; | |
| width: 88%; | |
| } | |
| cart-link, | |
| product-listing { | |
| display: block; | |
| margin-bottom: 1em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <cart-link></cart-link> | |
| <p><strong>Jolly Roger T-Shirt</strong></p> | |
| <product-listing price="39" uid="tshirt-jolly-roger"></product-listing> | |
| <p><strong>Anchor (gently used)</strong></p> | |
| <product-listing price="79" uid="anchor"></product-listing> | |
| <p><strong>Parrot</strong></p> | |
| <product-listing price="189" uid="parrot"></product-listing> | |
| <script src="main.js"></script> | |
| </body> | |
| </html> |
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| class Signal { | |
| // Initialize the class | |
| constructor (val) { | |
| this.value = val; | |
| } | |
| // Add a new item | |
| add (key, val) { | |
| // Update the value | |
| this.value[key] = val; | |
| // Create a new event | |
| let event = new CustomEvent('cart-updated', { | |
| bubbles: true, | |
| detail: {key, val} | |
| }); | |
| // Dispatch the event | |
| return document.dispatchEvent(event); | |
| } | |
| // Get the number of items in the cart | |
| size () { | |
| return Object.keys(this.value).length; | |
| } | |
| // Check if an item is in the object | |
| has (key) { | |
| return !!this.value[key]; | |
| } | |
| } | |
| // let cart = {}; | |
| let cart = new Signal({}); | |
| customElements.define('cart-link', class extends HTMLElement { | |
| // Instantiate the Web Component | |
| constructor () { | |
| // Inherit parent class properties | |
| super(); | |
| // Render the initial UI | |
| this.render(); | |
| // Listen for cart events | |
| document.addEventListener('cart-updated', this); | |
| } | |
| // Handle Events | |
| handleEvent (event) { | |
| this.render(); | |
| } | |
| // Render the UI | |
| render () { | |
| this.innerHTML = `<a href="/checkout">🛒 ${cart.size()} Items</a>`; | |
| } | |
| }); | |
| customElements.define('product-listing', class extends HTMLElement { | |
| /** | |
| * Instantiate the Web Component | |
| */ | |
| constructor () { | |
| // Inherit parent class properties | |
| super(); | |
| // Set properties | |
| this.uid = this.getAttribute('uid'); | |
| this.price = parseFloat(this.getAttribute('price')); | |
| // Render the initial UI | |
| this.render(); | |
| // Listen for events | |
| document.addEventListener('cart-updated', this); | |
| this.addEventListener('click', this); | |
| } | |
| // Handle events | |
| handleEvent (event) { | |
| // If it's a cart update event | |
| if (event.type === 'cart-updated') { | |
| this.render(); | |
| return; | |
| } | |
| // If it's a click on the button | |
| if (event.type === 'click' && event.target.closest('button')) { | |
| cart.add(this.uid, this.price); | |
| } | |
| } | |
| // Render the UI | |
| render () { | |
| this.innerHTML = cart.has(this.uid) ? '<em>This is item in your cart</em>' : `<button>Add to Cart - $${this.price}</button>`; | |
| } | |
| }); |
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