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 январь 2020 г..
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 in the case of a shadow DOM.
Синтаксис
var isItConnected = nodeObjectInstance.isConnected
Return value
A Boolean that is true if the node is connected to its relevant context object, and false if not.
Пример
Стандартный DOM пример:
js
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:
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 Спецификации
| Specification |
|---|
| DOM # ref-for-dom-node-isconnected① |