Node.isConnected

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

isConnectedNode 的一个只读属性接口。无论节点是否与 DOM 树连接,该属性都会返回一个布尔值。例如:Document 对象与一般 DOM 树连接,ShadowRoot 与 shadow DOM 连接。

语法

var isItConnected = nodeObjectInstance.isConnected

返回值

返回 布尔值 — 如果该节点与 DOM 树连接则返回 true, 否则返回 false

样例

标准 DOM 树

js
let test = document.createElement("p");
console.log(test.isConnected); // Returns false
document.body.appendChild(test);
console.log(test.isConnected); // Returns true

Shadow DOM 树

js
// Create a shadow root
var shadow = this.attachShadow({ mode: "open" });

// Create some CSS to apply to the shadow dom
var style = document.createElement("style");
console.log(style.isConnected); // returns false

style.textContent =
  ".wrapper {" +
  "position: relative;" +
  "}" +
  ".info {" +
  "font-size: 0.8rem;" +
  "width: 200px;" +
  "display: inline-block;" +
  "border: 1px solid black;" +
  "padding: 10px;" +
  "background: white;" +
  "border-radius: 10px;" +
  "opacity: 0;" +
  "transition: 0.6s all;" +
  "position: absolute;" +
  "bottom: 20px;" +
  "left: 10px;" +
  "z-index: 3;" +
  "}" +
  // Attach the created style element to the shadow dom

  shadow.appendChild(style);
console.log(style.isConnected); // Returns true

规范

Specification
DOM
# ref-for-dom-node-isconnected①

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
isConnected

Legend

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Full support
Full support