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 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:

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 Status Comment
DOM
Определение 'isConnected' в этой спецификации.
Живой стандарт Initial definition.

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