Node.isConnected
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.
Синтаксис
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.
Пример
Стандартный DOM пример:
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
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
Спецификация
Specification |
---|
DOM Standard # ref-for-dom-node-isconnected① |
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