我正在尝试使用ShadowDomv1(与https://github.com/webcomponents/webcomponentsjshttps://github.com/webcomponents/shadycss一起使用),但是它不起作用。

ShadowDom本身可以工作,但是css没有封装(如我们在h2 css规则中所见)。

它可以在Chrome和Safari上正常运行(但它们本机都支持ShadowDomv1)。

我是否想念某些东西还是不可能?

这是jsbin:http://jsbin.com/maqohoxowu/edit?html,output

和代码:

<script type="text/javascript" src="https://rawgithub.com/webcomponents/webcomponentsjs/master/webcomponents-hi-sd-ce.js"></script>
<style type="text/css">
    h2 {
        color: red;
        border-bottom: 1px black dotted;
    }
</style>
<h2>h2 red and dotted</h2>

<my-element>
</my-element>

<template id="myElementTemplate">
    <style scope="my-element">
        h2 {color: blue}
    </style>
    <div>
        <h2>h2 blue and not dotted !</h2> <!-- Should not be dotted because of the encapsulation -->
    </div>
</template>

<script type="text/javascript">
    ShadyCSS.prepareTemplate(myElementTemplate, 'my-element');

    class MyElement extends HTMLElement {
        connectedCallback() {
            ShadyCSS.styleElement(this);

            if (!this.shadowRoot) {
                this.attachShadow({mode: 'open'});
                this.shadowRoot.appendChild(document.importNode(myElementTemplate.content, true));
            }
            ShadyCSS.styleElement(this);
        }
    }

    customElements.define("my-element", MyElement);
</script>

最佳答案

您可以使用CustomStyleInterface将文档级样式仅应用于非Shadow DOM:



const CustomStyleInterface = window.ShadyCSS.CustomStyleInterface;
CustomStyleInterface.addCustomStyle(document.querySelector('style.doc-level'));

class MyElement extends HTMLElement {
  connectedCallback() {
      this.attachShadow({ mode: 'open' });
      this.shadowRoot.appendChild(document.importNode(myElementTemplate.content, true));
  }
}

customElements.define("my-element", MyElement);

<script src="https://rawgithub.com/webcomponents/webcomponentsjs/master/webcomponents-hi-sd-ce.js"></script>
<script src="https://rawgit.com/webcomponents/shadycss/master/custom-style-interface.min.js"></script>

<style class="doc-level">
  h2 {
    color: red;
    border-bottom: 1px black dotted;
  }
</style>

<h2>h2 red and dotted</h2>

<my-element></my-element>

<template id="myElementTemplate">
    <style>
        h2 {color: blue}
    </style>
    <div>
        <h2>h2 blue and not dotted !</h2>
    </div>
</template>

07-28 07:18