Created
December 27, 2018 14:10
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HOC Component for datx-jsonapi
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import { IJsonapiModel, IJsonapiView, Response } from 'datx-jsonapi'; | |
import { IDictionary } from 'datx-utils'; | |
import { action, observable } from 'mobx'; | |
import { observer } from 'mobx-react'; | |
import * as React from 'react'; | |
type LoadingProps = {loading: IDictionary<boolean>} & { | |
[key: string]: IJsonapiView; | |
}; | |
interface IResponseWithNext<T extends IJsonapiModel> extends Response<T> { | |
next: Promise<Response<T>>; | |
} | |
function responseHasNext(response: IResponseWithNext<IJsonapiModel>): true; | |
function responseHasNext(response?: Response<IJsonapiModel>): false; | |
function responseHasNext(response?: Response<IJsonapiModel> | IResponseWithNext<IJsonapiModel>): boolean { | |
return Boolean( | |
response && | |
response.pageInfo && | |
typeof response.pageInfo.currentPage === 'number' && | |
typeof response.pageInfo.totalPages === 'number' && | |
response.pageInfo.currentPage < response.pageInfo.totalPages && | |
response.next, | |
); | |
} | |
export function infinite( | |
propName: string, | |
threshold?: number, | |
target: HTMLElement = document.body, | |
) { | |
return <T, U>(Component: React.ComponentClass<T, U>) => { | |
@observer | |
class InfiniteScrollWrapper extends React.Component<T, U> { | |
private componentState = observable({ loading: false }); | |
public componentWillMount() { | |
if (typeof threshold === 'number') { | |
document.addEventListener('scroll', this.onScroll); | |
this.onScroll(); | |
} | |
} | |
public componentWillUnmount() { | |
if (typeof threshold === 'number') { | |
document.removeEventListener('scroll', this.onScroll); | |
} | |
} | |
public render() { | |
const props = { | |
...this.props, | |
loading: { | |
...(this.props as any as LoadingProps).loading, | |
[propName]: (this.props as any as LoadingProps).loading[propName] || this.componentState.loading, | |
}, | |
}; | |
this.onScroll(); | |
return ( | |
<Component {...props} loadMore={this.loadMore} /> | |
); | |
} | |
@action.bound | |
private onScroll() { | |
// TODO: A more robust algorithm | |
if (target.getBoundingClientRect().bottom - window.innerHeight < 100) { | |
this.loadMore(); | |
} | |
} | |
@action.bound | |
private loadMore() { | |
if (!this.componentState.loading) { | |
const view = (this.props as any as LoadingProps)[propName]; | |
if (responseHasNext(view.latestResponse)) { | |
this.componentState.loading = true; | |
(view.latestResponse as IResponseWithNext<IJsonapiModel>).next | |
.then(() => { | |
this.componentState.loading = false; | |
}, () => { | |
this.componentState.loading = false; | |
}); | |
} | |
} | |
} | |
} | |
return InfiniteScrollWrapper as any; | |
}; | |
} |
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