我正在使用LitElement构建自定义Web组件,并希望为其提供disabled
属性。我已经完成了样式设置,但恐怕我正在使用反模式来完成它。我已经定义了一个类方法,并在render()
方法中调用它来设置所需的样式。这是正确的还是有更好的模式?谢谢。
Javascript:
import {LitElement, html, css} from 'lit-element'
import {styleMap} from 'lit-html/directives/style-map'
class Button extends LitElement {
static get properties() { return {
disabled: {type: Boolean}
}
}
constructor() {
super();
this.disabled = false;
this.innerButtonText = this.innerHTML;
this.styles = {}
}
render() {
this.setStyles();
return html`
<style>@import "https://fonts.googleapis.com/css?family=Montserrat:700";</style>
<button style=${styleMap(this.styles)}>${this.innerButtonText}</button>
`
}
setStyles() {
if (this.disabled)
this.styles = {
backgroundColor: 'rgba(51,51,51,0.22)', color: 'rgba(51,51,51,0.66)', fontFamily: 'Montserrat', fontWeight: '700', height: '45px',
padding: '15px 30px 15px 30px', borderRadius: '5px', border: 'none', boxShadow: '0px 1px 3px #33333338', lineHeight: '1.3', letterSpacing: '1.3px'
};
else{
this.styles = {
backgroundColor: '#2e7d32', color: 'white', fontFamily: 'Montserrat', fontWeight: '700', height: '45px',
padding: '15px 30px 15px 30px', borderRadius: '5px', border: 'none', boxShadow: '0px 1px 3px #33333338', lineHeight: '1.3', letterSpacing: '1.3px'
};
}
}
}
customElements.define('custom-button', Button);
HTML:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<style>@import "https://fonts.googleapis.com/css?family=Montserrat:700";</style>
<script type="module" src="./components/button/button.js"></script>
<body>
<custom-button>Button</grange-button>
<button>Button</button>
</body>
</html>
首先,将reflect
option添加到reflect
属性,以便该属性“反映”该属性的值:
disabled
接下来,创建一个static get properties() {
return {
disabled: {
type: Boolean,
reflect: true,
},
};
}
来定义styles
static getter在其默认和禁用状态下的样式:
styles
最后,在<button>
方法中设置import { LitElement, css, html } from 'lit-element';
// ...
static get styles() {
return css`
button {
background-color: #2e7d32;
color: white;
/* ... */
}
button[disabled] {
background-color: rgba(51,51,51,0.22);
color: rgba(51,51,51,0.66);
}
`;
}
的<button>
属性:
disabled
((您会注意到,我也摆脱了render
属性,转而使用更惯用的render() {
return html`
<button ?disabled=${this.disabled}><slot></slot></button>
`;
}
。]
您可以在下面的代码段中看到所有这些协同工作:
innerButtonText
<slot>
element