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.

The isConnected read-only property of the Node interface returns a boolean indicating whether the Node is connected (directly or indirectly) to the context object, for example the Document object in the case of the normal DOM, or the ShadowRoot (en-US) in the case of a shadow DOM.


var isItConnected = nodeObjectInstance.isConnected

Return value

A Boolean (en-US) that is true if the node is connected to its relevant context object, and false if not.


Стандартный DOM пример:

let test = document.createElement("p");
console.log(test.isConnected); // returns false
console.log(test.isConnected); // returns true

A shadow DOM example:

// 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

console.log(style.isConnected); // returns true


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

Совместимость с браузерами

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