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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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