Created
March 10, 2020 03:17
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Stock JavaScript Web Component Counter
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>Dam Counter</title> | |
| </head> | |
| <body> | |
| <template id="dam-count-template"> | |
| <button class="dam-count-btn"></button> | |
| </template> | |
| <dam-count count=5></dam-count> | |
| <script type="module"> | |
| class DamCount extends HTMLElement { | |
| constructor() { | |
| super() | |
| this.updateCount = this.updateCount.bind(this) | |
| this.btn | |
| const template = document.getElementById('dam-count-template') | |
| const templateContent = template.content | |
| const shadow = this.attachShadow({mode: 'open'}) | |
| shadow.appendChild(templateContent.cloneNode(true)) | |
| } | |
| static get observedAttributes() { | |
| return ['count'] | |
| } | |
| attributeChangedCallback(name, o, n) { | |
| if (name === 'count') { | |
| if (this.btn) | |
| this.btn.textContent = `Count ${n}` | |
| } | |
| } | |
| updateCount(e) { | |
| let currentCount = this.getAttribute('count') | |
| this.setAttribute('count', Number(currentCount) + 1) | |
| } | |
| connectedCallback() { | |
| if (this.isConnected) { | |
| this.btn = this.shadowRoot.querySelector('.dam-count-btn') | |
| let n = this.getAttribute('count') | |
| this.btn.textContent = `Count ${n}` | |
| this.btn.addEventListener('click', this.updateCount) | |
| } | |
| } | |
| } | |
| customElements.define('dam-count', DamCount) | |
| </script> | |
| </body> | |
| </html> |
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