Question

我正在尝试创建一个自定义元素的“transcluded”版本，当它包装一些任意HTML时，它会选择性地从包装标记中选择内容并在其阴影DOM体内呈现它。像这样：

<tab-content>
      .....
                 <span class="name">John</span>
                 <span class="email">Email</span>
      .....
 </tab-content>

当我使用下面的代码时，我看到在运行此代码时，shadow DOM中的内容呈现为原样。

我在这里做错了什么？

的index.html

<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Untitled Document</title>
<link href="import.html" rel="import" />
</head>

<body>

<tab-content>
<div id="test">
   <span class="name">
	   John
   </span>
   <span class="email">
	   john@doe.com
   </span>
</div>
</tab-content>

</body>
</html>

<head>
	<link href="style.css" type="text/css" rel="stylesheet">
</head>
<template id="tag">
  <div class="content">
     This is the shadow DOM content. Your name is <content select="#test .name"></content> and email is <content select="#test .email"></content>
  </div>
</template>

<script>
var proto = Object.create(HTMLElement.prototype);
var hostDocument = document.currentScript.ownerDocument;
proto.createdCallback = function () {
	var root = this.createShadowRoot();
	root.appendChild(hostDocument.getElementById("tag").content);
}

var tab = document.registerElement("tab-content", {
	prototype: proto
});
</script>

的style.css

@charset "UTF-8";
/* CSS Document */


.test-content {
	background-color: #f00;
	widthL 200px;
	height: 300px;
}

Answer 1

我已经这样做了：

来自：

var root = this.createShadowRoot();

到：

  var host = document.querySelector('#test');
  var root = host.createShadowRoot();

<强> import.html

<head>
    <link href="style.css" type="text/css" rel="stylesheet">

</head>
<template id="tag">
  <div class="content">
     This is the shadow DOM content. Your name is <content  select=".name"></content> and email is <content select=".email"></content>
  </div>
</template>

<script>
var proto = Object.create(HTMLElement.prototype);
var hostDocument = document.currentScript.ownerDocument;


proto.createdCallback = function () {
  var host = document.querySelector('#test');
  var root = host.createShadowRoot();

  var template = hostDocument.querySelector('#tag');
  root.appendChild(template.content); 

}

var tab = document.registerElement("tab-content", {
    prototype: proto
});

</script>

正在运行代码http://plnkr.co/edit/sWgrWoyq3nlvGI5rTojr?p=preview

如何修复此自定义元素<content>元素实现？

1 个答案: