如何使用外部样式设置自定义Polymer元素的内部元素的样式? [英] How to style inner elements of custom Polymer element using external styles?
本文介绍了如何使用外部样式设置自定义Polymer元素的内部元素的样式?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
无法使用带有Polymer 1.x或2.x的Shadow DOM设置元素的样式.考虑Polymer 2.0中的以下自定义元素:
Unable to style an element using Shadow DOM with Polymer 1.x or 2.x. Consider the following custom element in Polymer 2.0:
<link rel="import" href="../polymer/polymer.html">
<!--
`semantic-ui-button`
@demo demo/index.html
-->
<dom-module id="polymer-button">
<template>
<div class$="button {{size}}">{{label}}</div>
</template>
<script>
class MyElement extends Polymer.Element {
static get is() {
return 'polymer-button';
}
static get properties() {
return {
label: {
type: String,
value: 'polymer-element'
},
size: { type: String }
};
}
}
window.customElements.define(MyElement.is, MyElement);
</script>
</dom-module>
在演示中:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, minimum-scale=1, initial-scale=1, user-scalable=yes">
<title>polymer-element demo</title>
<script src="../../webcomponentsjs/webcomponents-lite.js"></script>
<link rel="import" href="../../iron-demo-helpers/demo-pages-shared-styles.html">
<link rel="import" href="../../iron-demo-helpers/demo-snippet.html">
<link rel="import" href="../polymer-element.html">
<style is="custom-style" include="demo-pages-shared-styles"></style>
<style>
body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
.button {
background: #ccc;
border-radius: 4px;
color: #444;
}
.button.big {
font-size: 1rem;
padding: 6px;
}
</style>
</head>
<body>
<div class="vertical-section-container centered">
<h3>Basic polymer-element demo</h3>
<demo-snippet>
<template>
<polymer-button label="Demo"></polymer-button>
</template>
</demo-snippet>
</div>
</body>
</html>
在演示中为.button和.button.big定义的样式被 not 应用于阴影元素；但是，在Polymer 1.x中，如果我们使用ShadyDOM，则会应用样式:
The styles defined in the demo for .button and .button.big are not applied to the shadow element; however, in Polymer 1.x the styles are applied if we use ShadyDOM:
<link rel="import" href="../polymer/polymer.html">
<!--
`polymer-button`
@demo demo/index.html
-->
<dom-module id="polymer-button">
<template>
<div class$="button {{size}}">{{label}}</div>
</template>
<script>
Polymer({
is: 'polymer-button',
properties: {
label: { type: String }
},
});
</script>
</dom-module>
是否可以使用外部样式?
下面是我按照外观顺序所说的视觉表示:
Below is a visual representation of what I said above in order of appearance:
- 使用Shadow DOM的聚合物1.x
- 使用ShadyDOM的聚合物1.x
- 聚合物2.x
推荐答案
这篇关于如何使用外部样式设置自定义Polymer元素的内部元素的样式?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
