react-update-at

React wrapper to re-render component at a given times.

Why ?

Sometime, especially when working with dates, you want your component to re-render even if neither it's props and states have changed.

For instance take an event described by the following object

{
    title: "My sweet event",
    dates: {
        start: "2021-01-01T10:00:00",
        end: "2021-01-01T11:00:00"
    }
}

You might want the component using this object to display the following labels : upcoming, in progress, passed depending on the current time. Unfortunatly the object describing the event remaining the same, the related component will not re-render unless you force it to.

This is where react-update-at comes handy. It lets you simply wrap the component you wanna see updated with a UpdateAt component OR with a withUpdateAt function.

Example

Install

npm install react-update-at
// or
yarn add react-update-at

Usage

With the UpdateAt component.

import UpdateAt from "react-update-at";

const ComponentToUpdate = () => {
  return <div>{new Date().toString()}</div>;
};

const App = () => {
  return (
    // update 5s after first rendering
    <UpdateAt dates={[new Date(Date.now() + 5e3)]}>
      <ComponentToUpdate />
    </UpdateAt>
  );
};

With the withUpateAt function. Created elements will always have access to the "update-at" features through their props.

import { withUpdateAt } from "react-update-at";

const EventTimeLabel = ({ event }) => {
  return <>{/* playing with dates */}</>;
};

const EventTimeLabelUpdateAt = withUpdateAt(EventTimeLabel);

const App = () => {
  const event = {
    /* as above */
  };
  return (
    <EventTimeLabelUpdateAt
      event={event}
      dates={[new Date(event.dates.start), new Date(event.dates.end)]}
    />
  );
};

Options

props		default	type
dates	required		Date[]	When to trigger the re-render
delay	optional	10(ms)	number	Because wrapped components will usually interact with dates, you can set a delay in order for that component to behave correctly

License

MIT