export or send data in react-CodePudding

How can I export my data from a react stateful component to a simple JS file??

for example: From here: (I want to export dates)

function Calendar() {
  const [selectedDay, setSelectedDay] = useState([
   {year: 2021, month:11, day:11},
   {year: 2022, month: 1, day: 2,
  ]);

  const dates = selectedDay.map(d => d)
}

To here a simple js file ( builder.js ):

(I want to show dates in ..... place)

export const buildDaysCells = () => {
  const v = [];
  for (let i = 0; i < MONTHS_PER_YEAR * NUM_OF_YEARS; i  = 1) {
    const startMonth = i;
    v.push({
      id: `m${startMonth}`,
      title: `${DAYS_NAMES[i]} ${......}`, 
    });
  }
  return v;
};

CodePudding user response：

You can set a parameters for buildDaysCells and pass it in ...

export const buildDaysCells = (dates) => {
  const v = [];
  for (let i = 0; i < MONTHS_PER_YEAR * NUM_OF_YEARS; i  = 1) {
    const startMonth = i;
    v.push({
      id: `m${startMonth}`,
      title: `${DAYS_NAMES[i]} ${dates}`, 
    });
  }
  return v;
};

then in first component you can pass dates

function Calendar() {
  const [selectedDay, setSelectedDay] = useState([
   {year: 2021, month:11, day:11},
   {year: 2022, month: 1, day: 2,
  ]);

  const dates = selectedDay.map(d => d)

  console.log(buildDaysCells(dates)) // You can check this part in your console
}

CodePudding user response：

The official answer is, "You can't", reference. You need to change these codes into hooks:

function useCalendarDates() {
    const [selectedDay, setSelectedDay] = useState([
        { year: 2021, month: 11, day: 11 },
        { year: 2022, month: 1, day: 2 },
    ]);

    const dates = selectedDay.map(d => d);

    return dates;
}

export const useBuildDaysCells = () => {
    const dates = useCalendarDates();
    const v = [];
    for (let i = 0; i < MONTHS_PER_YEAR * NUM_OF_YEARS; i  = 1) {
        const startMonth = i;
        v.push({
            id: `m${startMonth}`,
            title: `${DAYS_NAMES[i]} ${dates}`,
        });
    }
    return v;
};

CodePudding user response：

You can achieve this by getting data from function since variable will only get their data only function the function is called in react component. In data file

import react, { useState } from "react";

function getData() {
  return [
    { year: 2021, month: 11, day: 11 },
    { year: 2022, month: 1, day: 2 },
  ];
}

function Calendar() {
  const [selectedDay, setSelectedDay] = useState(getData());

  const dates = selectedDay.map((d) => d);
}

export { Calendar, getData };

In recieving file:

import React from "react";
import { getData } from "./result";

const App = () => {
  console.log(getData());
  return <div>{JSON.stringify(getData())}</div>;
};

export default App;