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本文介紹了如何判斷一個元素是否在影子 DOM 中?的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我有一個項目，我在本地使用影子 DOM(而不是通過 polyfill).我想檢測給定的 element 是否包含在 shadow DOM 或 light DOM 中.

我查看了元素的所有屬性，但似乎沒有任何根據元素所在的 DOM 類型而有所不同.

如何確定一個元素是陰影 DOM 還是光 DOM 的一部分?

<小時>

以下是出于本問題的目的被認為是shadow DOM"和light DOM"的示例.

<上一頁>(輕根) ? 文檔(淺色) ? HTML(光) |? 身體(光) |? DIV(影根) |? 影子根(影子)|? 分區(影子)|? 框架(輕根) |? 文檔(光) |? HTML(光) ||? 身體(光) ||? 分區(影根) ||? 影子根(影子)||? 分區(無)|? [第二個文檔的未附加 DIV](無) ? [第一個文檔的未附加 DIV]

<!doctype html><標題>isInShadow() 測試文檔 - 無法在 Stack Exchange 的沙箱中運行</標題><iframe src="about:blank"></iframe><腳本>函數isInShadow(元素){//去做}功能測試() {//(輕根) ? 文檔//(淺色) ? HTMLvar html = document.documentElement;console.assert(isInShadow(html) === false);//(光)|? 身體var body = document.body;console.assert(isInShadow(body) === false);//(光)|? DIVvar div = document.createElement('div');body.appendChild(div);console.assert(isInShadow(div) === false);//(影子根) |? 影子根var divShadow = div.createShadowRoot();var shadowDiv = document.createElement('div');divShadow.appendChild(shadowDiv);//(陰影) |? 分區console.assert(isInShadow(shadowDiv) === true);//(陰影) |? 框架var iframe = document.querySelector('iframe');shadowDiv.appendChild(iframe);console.assert(isInShadow(iframe) === true);//(輕根) |? 文檔var iframeDocument = iframe.contentWindow.document;//(光)|? HTMLvar iframeHtml = iframeDocument.documentElement;console.assert(isInShadow(iframeHtml) === false);//(光)||? 身體var iframeBody = iframeDocument.body;//console.assert(isInShadow(iframeHtml) === false);//(光)||? 分區var iframeDiv = iframeDocument.createElement('div');iframeBody.appendChild(iframeDiv);console.assert(isInShadow(iframeDiv) === false);//(影子根) ||? 影子根var iframeDivShadow = iframeDiv.createShadowRoot();//(陰影) ||? 分區var iframeDivShadowDiv = iframeDocument.createElement('div');iframeDivShadow.appendChild(iframeDivShadowDiv);console.assert(isInShadow(iframeDivShadowDiv) === true);//(無) |? [第二個文檔的未附加 DIV]var iframeUnattached = iframeDocument.createElement('div');console.assert(Boolean(isInShadow(iframeUnattached)) === false);//(無) ? [第一個文檔的未附加 DIV]var rootUnattached = document.createElement('div');console.assert(Boolean(isInShadow(rootUnattached)) === false);}加載 = 函數 main() {console.group('測試');嘗試 {測試();console.log('測試完成.');} 最后 {控制臺.groupEnd();}}</script>

解決方案

如果調用ShadowRoot的toString()方法，會返回"[object ShadowRoot]".根據這個事實，這是我的方法:

function isInShadow(node) {var parent = (node && node.parentNode);而(父){if(parent.toString() === "[object ShadowRoot]") {返回真；}父 = 父節點；}返回假；}

<小時>

編輯

Jeremy Banks 提出了另一種循環方式的方法.這種方法和我的有點不同:它還會檢查傳遞的節點本身，而我沒有這樣做.

function isInShadow(node) {for (; node; node = node.parentNode) {if (node.toString() === "[object ShadowRoot]") {返回真；}}返回假；}

function isInShadow(node) {for (; node; node = node.parentNode) {if (node.toString() === "[object ShadowRoot]") {返回真；}}返回假；}console.group('測試');var lightElement = document.querySelector('div');console.assert(isInShadow(lightElement) === false);var shadowChild = document.createElement('div');lightElement.createShadowRoot().appendChild(shadowChild);console.assert(isInShadow(shadowChild) === true);var orphanedElement = document.createElement('div');console.assert(isInShadow(orphanedElement) === false);var orphanedShadowChild = document.createElement('div');orphanedElement.createShadowRoot().appendChild(orphanedShadowChild);console.assert(isInShadow(orphanedShadowChild) === true);var fragmentChild = document.createElement('div');document.createDocumentFragment().appendChild(fragmentChild);console.assert(isInShadow(fragmentChild) === false);console.log('完成.');console.groupEnd();

<div></div>

I have a project where I'm using the shadow DOM natively (not through a polyfill). I'd like to detect if a given element is contained within a shadow DOM or a light DOM.

I've looked through all of the properties on the elements, but there don't seem to be any which vary based on the type of DOM an element is in.

How can I determine if an element is part of a shadow DOM or a light DOM?

Here is an example of what is considered "shadow DOM" and "light DOM" for the purpose of this question.

 (light root) ? Document
      (light)   ? HTML
      (light)   | ? BODY
      (light)   |   ??DIV
(shadow root)   |     ? ShadowRoot
     (shadow)   |       ? DIV 
     (shadow)   |         ? IFRAME 
 (light root)   |           ? Document
      (light)   |             ? HTML
      (light)   |             | ? BODY
      (light)   |             |   ? DIV
(shadow root)   |             |     ? ShadowRoot
     (shadow)   |             |       ? DIV
       (none)   |             ? [Unattached DIV of second Document]
       (none)   ? [Unattached DIV of first Document]

<!doctype html>
<title>
  isInShadow() test document - can not run in Stack Exchange's sandbox
</title>
<iframe src="about:blank"></iframe>
<script>

function isInShadow(element) {
  // TODO
}

function test() {
  //  (light root) ? Document
  //       (light)   ? HTML
  var html = document.documentElement;

  console.assert(isInShadow(html) === false);

  //       (light)   | ? BODY
  var body = document.body;

  console.assert(isInShadow(body) === false);

  //       (light)   |   ??DIV
  var div = document.createElement('div');
  body.appendChild(div);

  console.assert(isInShadow(div) === false);

  // (shadow root)   |     ? ShadowRoot
  var divShadow = div.createShadowRoot();

  var shadowDiv = document.createElement('div');
  divShadow.appendChild(shadowDiv);

  //      (shadow)   |       ? DIV 
  console.assert(isInShadow(shadowDiv) === true);

  //      (shadow)   |         ? IFRAME 
  var iframe = document.querySelector('iframe');
  shadowDiv.appendChild(iframe);

  console.assert(isInShadow(iframe) === true);

  //  (light root)   |           ? Document
  var iframeDocument = iframe.contentWindow.document;

  //       (light)   |             ? HTML
  var iframeHtml = iframeDocument.documentElement;

  console.assert(isInShadow(iframeHtml) === false);

  //       (light)   |             | ? BODY
  var iframeBody = iframeDocument.body;

  //
  console.assert(isInShadow(iframeHtml) === false);

  //       (light)   |             |   ? DIV
  var iframeDiv = iframeDocument.createElement('div');
  iframeBody.appendChild(iframeDiv);
   
  console.assert(isInShadow(iframeDiv) === false);
   
  // (shadow root)   |             |     ? ShadowRoot
  var iframeDivShadow = iframeDiv.createShadowRoot();

  //      (shadow)   |             |       ? DIV
  var iframeDivShadowDiv = iframeDocument.createElement('div');
  iframeDivShadow.appendChild(iframeDivShadowDiv);
    
  console.assert(isInShadow(iframeDivShadowDiv) === true);
     
  //        (none)   |             ? [Unattached DIV of second Document]
  var iframeUnattached = iframeDocument.createElement('div');
    
  console.assert(Boolean(isInShadow(iframeUnattached)) === false);

  //        (none)   ? [Unattached DIV of first Document]
  var rootUnattached = document.createElement('div');
    
  console.assert(Boolean(isInShadow(rootUnattached)) === false);
}

onload = function main() {
  console.group('Testing');
  try {
    test();
    console.log('Testing complete.');
  } finally {
    console.groupEnd();
  }
}

</script>

解決方案

If you call a ShadowRoot's toString() method, it will return "[object ShadowRoot]". According to this fact, here's my approach:

function isInShadow(node) {
    var parent = (node && node.parentNode);
    while(parent) {
        if(parent.toString() === "[object ShadowRoot]") {
            return true;
        }
        parent = parent.parentNode;
    }
    return false;
}

EDIT

Jeremy Banks suggests an approach in another style of looping. This approach is a little different from mine: it also checks the passed node itself, which I didn't do.

function isInShadow(node) {
    for (; node; node = node.parentNode) {
        if (node.toString() === "[object ShadowRoot]") {
            return true;
        }
    }
    return false;
}

function isInShadow(node) {
    for (; node; node = node.parentNode) {
        if (node.toString() === "[object ShadowRoot]") {
            return true;
        }
    }
    return false;
}

console.group('Testing');

var lightElement = document.querySelector('div');    

console.assert(isInShadow(lightElement) === false);

var shadowChild = document.createElement('div');
lightElement.createShadowRoot().appendChild(shadowChild);

console.assert(isInShadow(shadowChild) === true);

var orphanedElement = document.createElement('div');

console.assert(isInShadow(orphanedElement) === false);

var orphanedShadowChild = document.createElement('div');
orphanedElement.createShadowRoot().appendChild(orphanedShadowChild);

console.assert(isInShadow(orphanedShadowChild) === true);

var fragmentChild = document.createElement('div');
document.createDocumentFragment().appendChild(fragmentChild);

console.assert(isInShadow(fragmentChild) === false);

console.log('Complete.');
console.groupEnd();

<div></div>

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如何判斷一個元素是否在影子 DOM 中?

問題描述

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