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Node: isConnected property - Web APIs | MDN
Node: isConnected property Baseline Widely available
The read-only isConnected
property of the Node
interface
returns a boolean indicating whether the node is connected
(directly or indirectly) to a Document
object.
A boolean value that is true
if the node is connected to its relevant context object,
and false
if not.
A standard DOM example:
let test = document.createElement("p");
console.log(test.isConnected); // Returns false
document.body.appendChild(test);
console.log(test.isConnected); // Returns true
A shadow DOM example:
// Create a shadow root
const shadow = this.attachShadow({ mode: "open" });
// Create some CSS to apply to the shadow DOM
const 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;
positions: 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