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103 lines
3.6 KiB
TypeScript
103 lines
3.6 KiB
TypeScript
import type Mithril from 'mithril';
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export interface ComponentAttrs extends Mithril.Attributes {
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}
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/**
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* The `Component` class defines a user interface 'building block'. A component
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* generates a virtual DOM to be rendered on each redraw.
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*
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* Essentially, this is a wrapper for Mithril's components that adds several useful features:
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*
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* - In the `oninit` and `onbeforeupdate` lifecycle hooks, we store vnode attrs in `this.attrs.
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* This allows us to use attrs across components without having to pass the vnode to every single
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* method.
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* - The static `initAttrs` method allows a convenient way to provide defaults (or to otherwise modify)
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* the attrs that have been passed into a component.
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* - When the component is created in the DOM, we store its DOM element under `this.element`; this lets
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* us use jQuery to modify child DOM state from internal methods via the `this.$()` method.
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* - A convenience `component` method, which serves as an alternative to hyperscript and JSX.
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*
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* As with other Mithril components, components extending Component can be initialized
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* and nested using JSX, hyperscript, or a combination of both. The `component` method can also
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* be used.
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*
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* @example
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* return m('div', <MyComponent foo="bar"><p>Hello World</p></MyComponent>);
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*
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* @example
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* return m('div', MyComponent.component({foo: 'bar'), m('p', 'Hello World!'));
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*
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* @see https://mithril.js.org/components.html
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*/
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export default abstract class Component<T extends ComponentAttrs = ComponentAttrs> implements Mithril.ClassComponent<T> {
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/**
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* The root DOM element for the component.
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*/
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protected element: Element;
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/**
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* The attributes passed into the component.
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*
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* @see https://mithril.js.org/components.html#passing-data-to-components
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*/
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protected attrs: T;
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/**
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* @inheritdoc
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*/
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abstract view(vnode: Mithril.Vnode<T, this>): Mithril.Children;
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/**
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* @inheritdoc
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*/
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oninit(vnode: Mithril.Vnode<T, this>): void;
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/**
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* @inheritdoc
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*/
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oncreate(vnode: Mithril.VnodeDOM<T, this>): void;
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/**
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* @inheritdoc
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*/
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onbeforeupdate(vnode: Mithril.VnodeDOM<T, this>): void;
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/**
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* @inheritdoc
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*/
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onupdate(vnode: Mithril.VnodeDOM<T, this>): void;
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/**
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* @inheritdoc
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*/
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onbeforeremove(vnode: Mithril.VnodeDOM<T, this>): void;
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/**
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* @inheritdoc
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*/
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onremove(vnode: Mithril.VnodeDOM<T, this>): void;
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/**
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* Returns a jQuery object for this component's element. If you pass in a
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* selector string, this method will return a jQuery object, using the current
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* element as its buffer.
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*
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* For example, calling `component.$('li')` will return a jQuery object
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* containing all of the `li` elements inside the DOM element of this
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* component.
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*
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* @param [selector] a jQuery-compatible selector string
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* @returns the jQuery object for the DOM node
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* @final
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*/
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protected $(selector?: string): JQuery;
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/**
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* Convenience method to attach a component without JSX.
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* Has the same effect as calling `m(THIS_CLASS, attrs, children)`.
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*
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* @see https://mithril.js.org/hyperscript.html#mselector,-attributes,-children
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*/
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static component(attrs?: {}, children?: null): Mithril.Vnode;
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/**
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* Saves a reference to the vnode attrs after running them through initAttrs,
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* and checking for common issues.
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*/
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private setAttrs;
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/**
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* Initialize the component's attrs.
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*
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* This can be used to assign default values for missing, optional attrs.
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*/
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protected static initAttrs<T>(attrs: T): void;
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}
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