如何将Web组件分离为单个文件并加载它们? [英] How to separate web components to individual files and load them?
问题描述
我有一个Web组件x-counter，它位于单个文件中.
const template = document.createElement('template');
template.innerHTML = `
<style>
button, p {
display: inline-block;
}
</style>
<button aria-label="decrement">-</button>
<p>0</p>
<button aria-label="increment">+</button>
`;
class XCounter extends HTMLElement {
set value(value) {
this._value = value;
this.valueElement.innerText = this._value;
}
get value() {
return this._value;
}
constructor() {
super();
this._value = 0;
this.root = this.attachShadow({ mode: 'open' });
this.root.appendChild(template.content.cloneNode(true));
this.valueElement = this.root.querySelector('p');
this.incrementButton = this.root.querySelectorAll('button')[1];
this.decrementButton = this.root.querySelectorAll('button')[0];
this.incrementButton
.addEventListener('click', (e) => this.value++);
this.decrementButton
.addEventListener('click', (e) => this.value--);
}
}
customElements.define('x-counter', XCounter);
此处，模板定义为使用JavaScript，并且html内容作为内联字符串添加.有没有一种方法可以将模板分离为x-counter.html文件(例如，将css声明为x-counter.css)并将相应的JavaScript代码分离为xcounter.js并将它们加载到index.html中?
每个示例中，我的查询都有混合的Web组件.我希望将关注点分离开，但是我不确定如何使用组件来做到这一点.您能否提供示例代码?谢谢.
在主文件中，使用<script>加载Javascript文件x-counter.js.
在Javascript文件中，使用fetch()加载HTML代码x-counter.html.
在HTML文件中，使用<link rel="stylesheet">加载CSS文件x-counter.css.
CSS文件:x-counter.css
button, p {
display: inline-block;
color: dodgerblue;
}
HTML文件:x-counter.html
<link rel="stylesheet" href="x-counter.css">
<button aria-label="decrement">-</button>
<p>0</p>
<button aria-label="increment">+</button>
JavaScript文件:x-counter.js
fetch("x-counter.html")
.then(stream => stream.text())
.then(text => define(text));
function define(html) {
class XCounter extends HTMLElement {
set value(value) {
this._value = value;
this.valueElement.innerText = this._value;
}
get value() {
return this._value;
}
constructor() {
super();
this._value = 0;
var shadow = this.attachShadow({mode: 'open'});
shadow.innerHTML = html;
this.valueElement = shadow.querySelector('p');
var incrementButton = shadow.querySelectorAll('button')[1];
var decrementButton = shadow.querySelectorAll('button')[0];
incrementButton.onclick = () => this.value++;
decrementButton.onclick = () => this.value--;
}
}
customElements.define('x-counter', XCounter);
}
主文件:index.html
<html>
<head>
<!-- ... -->
<script src="x-counter.js"></script>
</head>
<body>
<x-counter></x-counter>
</body>
</html>
I have a web component x-counter, which is in a single file.
const template = document.createElement('template');
template.innerHTML = `
<style>
button, p {
display: inline-block;
}
</style>
<button aria-label="decrement">-</button>
<p>0</p>
<button aria-label="increment">+</button>
`;
class XCounter extends HTMLElement {
set value(value) {
this._value = value;
this.valueElement.innerText = this._value;
}
get value() {
return this._value;
}
constructor() {
super();
this._value = 0;
this.root = this.attachShadow({ mode: 'open' });
this.root.appendChild(template.content.cloneNode(true));
this.valueElement = this.root.querySelector('p');
this.incrementButton = this.root.querySelectorAll('button')[1];
this.decrementButton = this.root.querySelectorAll('button')[0];
this.incrementButton
.addEventListener('click', (e) => this.value++);
this.decrementButton
.addEventListener('click', (e) => this.value--);
}
}
customElements.define('x-counter', XCounter);
Here the template is defined as using JavaScript and html contents are added as inline string. Is there a way to separate template to an x-counter.html file, css to say, x-counter.css and corresponding JavaScript code to xcounter.js and load them in index.html?
Every example I lookup has web components mixed. I would like to have separation of concerns, but I am not sure how to do that with components. Could you provide a sample code? Thanks.
In the main file, use <script> to load the Javascript file x-counter.js.
In the Javascript file, use fetch() to load the HTML code x-counter.html.
In the HTML file, use <link rel="stylesheet"> to load the CSS file x-counter.css.
CSS file : x-counter.css
button, p {
display: inline-block;
color: dodgerblue;
}
HTML file : x-counter.html
<link rel="stylesheet" href="x-counter.css">
<button aria-label="decrement">-</button>
<p>0</p>
<button aria-label="increment">+</button>
Javascript file : x-counter.js
fetch("x-counter.html")
.then(stream => stream.text())
.then(text => define(text));
function define(html) {
class XCounter extends HTMLElement {
set value(value) {
this._value = value;
this.valueElement.innerText = this._value;
}
get value() {
return this._value;
}
constructor() {
super();
this._value = 0;
var shadow = this.attachShadow({mode: 'open'});
shadow.innerHTML = html;
this.valueElement = shadow.querySelector('p');
var incrementButton = shadow.querySelectorAll('button')[1];
var decrementButton = shadow.querySelectorAll('button')[0];
incrementButton.onclick = () => this.value++;
decrementButton.onclick = () => this.value--;
}
}
customElements.define('x-counter', XCounter);
}
Main file : index.html
<html>
<head>
<!-- ... -->
<script src="x-counter.js"></script>
</head>
<body>
<x-counter></x-counter>
</body>
</html>
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