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May 24, 2017 01:16
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Creating Web Components in JavaScript (ES6) to use in your Angular, React and Ember projects
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Web Components</title> | |
| <style> | |
| body { | |
| font-family: 'Helvetica Neue'; | |
| } | |
| </style> | |
| <script src="progressbar.js"></script> | |
| </head> | |
| <body> | |
| <h1>Web Components</h1> | |
| <progress-bar></progress-bar> | |
| <script> | |
| (function() { | |
| var progress = document.querySelector('progress-bar'), | |
| complete = 0; | |
| var progressInterval = setInterval(() => { | |
| complete += 1; | |
| if (complete <= 100) { | |
| progress.setAttribute('complete', complete); | |
| } else { | |
| clearInterval(progressInterval); | |
| } | |
| }, 100); | |
| })(); | |
| </script> | |
| </body> | |
| </html> |
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| class ProgressBar extends HTMLElement { | |
| constructor() { | |
| super(); | |
| this.shadow = this.createShadowRoot(); | |
| this._complete = 0; | |
| } | |
| get complete() { | |
| return this._complete; | |
| } | |
| set complete(val) { | |
| this.setAttribute('complete', val); | |
| } | |
| static get observedAttributes() { | |
| return [ 'complete' ]; | |
| } | |
| attributeChangedCallback(name, oldVal, newVal) { | |
| var innerBar = this.shadow.querySelector('.progress-bar-inner'); | |
| switch(name) { | |
| case 'complete': | |
| this._complete = parseInt(newVal, 10) || 0; | |
| innerBar.style.width = this.complete + '%'; | |
| innerBar.innerHTML = this.complete + '%'; | |
| } | |
| } | |
| connectedCallback() { | |
| var template = ` | |
| <style> | |
| .progress-bar { | |
| width: 50%; | |
| height: 30px; | |
| background-color: #EDF2F4; | |
| border-radius: 5px; | |
| color: #FFF; | |
| } | |
| .progress-bar-inner { | |
| height: 100%; | |
| line-height: 30px; | |
| background: #2B2D42; | |
| text-align: center; | |
| border-radius: 5px; | |
| transition: width 0.25s; | |
| } | |
| </style> | |
| <div class="progress-bar"> | |
| <div class="progress-bar-inner">${this.complete}%</div> | |
| </div> | |
| `; | |
| this.shadow.innerHTML = template; | |
| } | |
| } | |
| window.customElements.define('progress-bar', ProgressBar); |
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