lit-element

property ['_$litElement$']

static ['_$litElement$']: boolean;

property renderOptions

readonly renderOptions: RenderOptions;

• rendering

method connectedCallback

connectedCallback: () => void;

• Invoked when the component is added to the document's DOM.

  In connectedCallback() you should setup tasks that should only occur when the element is connected to the document. The most common of these is adding event listeners to nodes external to the element, like a keydown event handler added to the window.

  connectedCallback() {
    super.connectedCallback();
    addEventListener('keydown', this._handleKeydown);
  }

  Typically, anything done in connectedCallback() should be undone when the element is disconnected, in disconnectedCallback().

  lifecycle

method createRenderRoot

protected createRenderRoot: () => HTMLElement | DocumentFragment;

• rendering

method disconnectedCallback

disconnectedCallback: () => void;

• Invoked when the component is removed from the document's DOM.

  This callback is the main signal to the element that it may no longer be used. disconnectedCallback() should ensure that nothing is holding a reference to the element (such as event listeners added to nodes external to the element), so that it is free to be garbage collected.

  disconnectedCallback() {
    super.disconnectedCallback();
    window.removeEventListener('keydown', this._handleKeydown);
  }

  An element may be re-connected after being disconnected.

  lifecycle

method render

protected render: () => unknown;

• Invoked on each update to perform rendering tasks. This method may return any value renderable by lit-html's ChildPart - typically a TemplateResult. Setting properties inside this method will *not* trigger the element to update. rendering

method update

protected update: (changedProperties: PropertyValues) => void;

• Updates the element. This method reflects property values to attributes and calls render to render DOM via lit-html. Setting properties inside this method will *not* trigger another update.

  Parameter changedProperties

  Map of changed properties with old values updates

type Entry

type Entry = LitUnstable.DebugLog.Entry | ReactiveUnstable.DebugLog.Entry;