Node: isConnected property
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 read-only isConnected property of the Node interface
returns a boolean indicating whether the node is connected
(directly or indirectly) to a Document object.
Value
A boolean value that is true if the node is connected to its relevant context object,
and false if not.
Examples
Standard DOM
A standard DOM example:
js
let test = document.createElement("p");
console.log(test.isConnected); // Returns false
document.body.appendChild(test);
console.log(test.isConnected); // Returns true
Shadow DOM
A shadow DOM example:
js
// 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
Specifications
| Specification |
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| DOM # ref-for-dom-node-isconnected① |
Browser compatibility
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isConnected
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