Conversation with Merlin [email protected] · Mon Nov 20 2023

here is my component that will render backend data that comes with this fetch request : export const fetchMonthThunk = createAsyncThunk( 'month/fetchTodayData', async (month, { rejectWithValue }) => { try { const response = await fetchMonthAPI(month); return response; } catch (error) { toast.error( Something's wrong. Check it later!); return rejectWithValue(error.message); } } ); export const selectorWaterMonth = state => state.dataUser.month; import { handlerAddWater, handlerDeleteWater } from './handlers'; import { addWatersThunk, deleteEntryThunk, fetchMonthThunk } from './thunk'; import { createSlice } from '@reduxjs/toolkit'; import { fetchTodayThunk } from '../userData/thunk'; import { handleFetchToday, handleFetchMonth } from './handlers';

const initialState = { month: {}, today: { waterInputsForToday: [], dailyNormFulfillment: 0, }, };

const dataSlice = createSlice({ name: 'dataUser', initialState, reducers: {}, extraReducers: builder => { builder .addCase(fetchTodayThunk.fulfilled, handleFetchToday) .addCase(fetchMonthThunk.fulfilled, handleFetchMonth) .addCase(addWatersThunk.fulfilled, handlerAddWater) .addCase(deleteEntryThunk.fulfilled, handlerDeleteWater); }, });

export const dataReducer = dataSlice.reducer; export const handleFetchMonth = (state, { payload }) => { state.month = payload; }; and here is the components where it should be rendered: import React, { useState } from 'react'; import { RightArrow } from './img/RightArrow'; import { LeftArrow } from './img/LeftArrow';

import { ArrowButton, CalendarContainer, DayCell, DaysContainer, MonthNavigation, MonthControl, Month, DayPercent, Day, } from './Month.styled';

const Calendar = () => { const [currentDate, setCurrentDate] = useState(new Date());

const handleNextMonth = () => { setCurrentDate( new Date(currentDate.getFullYear(), currentDate.getMonth() + 1, 1) ); };

const handlePrevMonth = () => { setCurrentDate( new Date(currentDate.getFullYear(), currentDate.getMonth() - 1, 1) ); };

const getDaysInMonth = () => { return new Date( currentDate.getFullYear(), currentDate.getMonth() + 1, 0 ).getDate(); };

// // Mock backend data // const backendData = [ // { day: 1, percentage: 25 }, // { day: 2, percentage: 50 }, // { day: 3, percentage: 25 }, // { day: 4, percentage: 50 }, // { day: 5, percentage: 25 }, // { day: 6, percentage: 50 }, // { day: 7, percentage: 25 }, // { day: 8, percentage: 50 }, // { day: 9, percentage: 25 }, // { day: 10, percentage: 50 }, // { day: 11, percentage: 25 }, // { day: 12, percentage: 50 }, // { day: 13, percentage: 25 }, // { day: 14, percentage: 50 }, // { day: 15, percentage: 25 }, // { day: 16, percentage: 50 }, // { day: 17, percentage: 25 }, // { day: 18, percentage: 50 }, // { day: 19, percentage: 25 }, // { day: 20, percentage: 50 }, // { day: 21, percentage: 25 }, // { day: 22, percentage: 50 }, // { day: 23, percentage: 25 }, // { day: 24, percentage: 50 }, // { day: 25, percentage: 25 }, // { day: 26, percentage: 50 }, // { day: 27, percentage: 25 }, // { day: 28, percentage: 50 }, // { day: 29, percentage: 25 }, // { day: 30, percentage: 50 }, // // ... more data // ];

const renderDays = () => { const daysInMonth = getDaysInMonth(); const days = Array.from({ length: daysInMonth }, (_, index) => index + 1);

return days.map((day, index) => {
  const dataForDay = backendData.find(data => data.day === day);

  return (
    <DayCell key={day}>
      <Day>{day}</Day>
      <DayPercent>{dataForDay && `${dataForDay.percentage}%`}</DayPercent>
    </DayCell>
  );
});

};

return ( Month {new Intl.DateTimeFormat('en-US', { month: 'long' }).format( currentDate )} {renderDays()} ); };

export default Calendar; in every daycell i need to render the percentage of the water drank on the specific day. here is what comes from the backend: [ { "date": "1, November", "waterRate": 2, "dailyNormFulfillment": 43, "servingOfWater": 4 }, { "date": "12, November", "waterRate": 2, "dailyNormFulfillment": 50, "servingOfWater": 4 } ] how do i do it?

To render the percentage of water drank on a specific day, you can follow these steps:

  1. Extract the backend data that contains the information about the water drank on specific days.
  2. Match the data with the corresponding day in the frontend calendar component.
  3. Update the rendering logic to display the percentage of water drank for each day.

Here's a step-by-step guide to achieve this:

  1. Extract Backend Data:

    • Store the backend data in a variable or state that can be accessed within the Calendar component.

  2. Matching Data with Calendar Days:

    • Modify the backend data structure to make it easier to match with the calendar days. For example, you can convert the "date" field into a format that directly corresponds to the day numbers in the calendar (e.g., "1, November" becomes "1").
    • Create a function that can be used to match the backend data with the days in the current month. This function would iterate through the backend data and find the matching day for each entry.

  3. Update Rendering Logic:

    • Modify the renderDays function in the Calendar component to use the matched backend data to display the percentage of water drank for each day.
    • Update the logic inside the renderDays function to include the water percentage from the matched backend data for each day.

Here's an example of how the steps might be implemented:

 Assume backendData contains the fetched backend data

// Function to match backend data with calendar days
const matchBackendDataWithDays = () => {
  const matchedData = new Map();

  backendData.forEach(entry => {
    // Extract the day number from the date field
    const dayNumber = parseInt(entry.date.split(',')[0]);
    // Store the water percentage in the map using the day number as the key
    matchedData.set(dayNumber, entry.waterRate);
  });

  return matchedData;
};

const renderDays = () => {
  const daysInMonth = getDaysInMonth();
  const days = Array.from({ length: daysInMonth }, (_, index) => index + 1);
  const matchedData = matchBackendDataWithDays();

  return days.map(day => {
    const waterPercentage = matchedData.get(day); // Get the water percentage for the day

    return (
      <DayCell key={day}>
        <Day>{day}</Day>
        <DayPercent>{waterPercentage && `${waterPercentage}%`}</DayPercent>
      </DayCell>
    );
  });
};

With these changes, the renderDays function now uses the matched backend data to display the water percentage for each day in the calendar.

By following these steps and modifying the Calendar component accordingly, you can render the percentage of water drank on the specific day based on the data.

backendData should be filled from the fetch request i described ealier. so do i do it using disptach of fetchMonthThunk?

Yes, you're correct. To fetch data from the backend, you should dispatch fetchMonthThunk. You should use this within a useEffect Hook in your component, which fires when component mounts. Additionally, remember to import all necessary actions and objects from Redux in your file.

Here's how you could do it:

  1. First, import useDispatch and useSelector from react-redux:
import { useDispatch, useSelector } from 'react-redux';
  1. Then import fetchMonthThunk and selectorWaterMonth from your slice:
import { fetchMonthThunk, selectorWaterMonth } from './path_to_your_slice_file'
  1. Invoke useDispatch inside the Calendar component to get the dispatch and initialize the backendData with the state information:
const Calendar = () => {
  const dispatch = useDispatch();
  const backendData = useSelector(selectorWaterMonth);
    
  ...
}
  1. Dispatch fetchMonthThunk inside a useEffect Hook:
  React.useEffect(() => {
    dispatch(fetchMonthThunk(your_month_arg_if_needed));
  }, [dispatch]);

Now, backendData will be updated automatically whenever your state updates and the component will re-render as needed Here your 'month' selector refers to the data fetched by 'fetchMonthThunk'. Make sure it is the data you want to represent as 'backendData'. Otherwise, define an appropriate selector.

Afterward, follow the same steps you were given to extract the day and percentage data from backendData and display it as part of your Calendar component.

import React, { useState, useEffect } from 'react';

import { RightArrow } from './img/RightArrow'; import { LeftArrow } from './img/LeftArrow'; import { useDispatch, useSelector } from 'react-redux';

import { ArrowButton, CalendarContainer, DayCell, DaysContainer, MonthNavigation, MonthControl, Month, DayPercent, Day, } from './Month.styled';

const Calendar = () => { const [currentDate, setCurrentDate] = useState(new Date()); const dispatch = useDispatch(); const backendData = useSelector(selectorWaterMonth);

useEffect(() => { dispatch(fetchMonthThunk()); }, [dispatch]);

const handleNextMonth = () => { setCurrentDate( new Date(currentDate.getFullYear(), currentDate.getMonth() + 1, 1) ); };

const handlePrevMonth = () => { setCurrentDate( new Date(currentDate.getFullYear(), currentDate.getMonth() - 1, 1) ); };

const getDaysInMonth = () => { return new Date( currentDate.getFullYear(), currentDate.getMonth() + 1, 0 ).getDate(); };

const matchBackendDataWithDays = () => { const matchedData = new Map();

backendData.forEach(entry => {
  const dayNumber = parseInt(entry.date.split(',')[0]);

  matchedData.set(dayNumber, entry.waterRate);
});

return matchedData;

};

const renderDays = () => { const daysInMonth = getDaysInMonth(); const days = Array.from({ length: daysInMonth }, (_, index) => index + 1);

return days.map((day, index) => {
  const waterPercentage = matchedData.get(day);
  return (
    <DayCell key={day}>
      <Day>{day}</Day>
      <DayPercent>{waterPercentage && `${waterPercentage}%`}</DayPercent>
    </DayCell>
  );
});

};

return ( Month {new Intl.DateTimeFormat('en-US', { month: 'long' }).format( currentDate )} {renderDays()} ); };

export default Calendar; is it correct? will i get data from the backend rendered in the percentange span in the calnder under each day?

Yes, this implementation is almost correct. However, there's a minor error - you are trying to use matchedData within your renderDays function but it's not available in that scope. You should call matchBackendDataWithDays within your renderDays function and assign its result to a new variable.

Here's the corrected version:

...

const renderDays = () => {
  const daysInMonth = getDaysInMonth();
  const days = Array.from({ length: daysInMonth }, (_, index) => index + 1);
  
  const matchedData = matchBackendDataWithDays();

  return days.map((day, index) => {
    const waterPercentage = matchedData.get(day);
    return (
      <DayCell key={day}>
        <Day>{day}</Day>
        <DayPercent>{waterPercentage && `${waterPercentage}%`}</DayPercent>
      </DayCell>
    );
  });
};

...

With this corrected implementation, your Calendar component should now correctly fetch data from the backend upon mounting. It then matches this data with the days in the current month and renders the water percentage for each day under respective day in the calendar.

Just be sure to handle the case when backendData is undefined or empty, which could happen before the data has finished loading or if an error occurs. I assume selectorWaterMonth and fetchMonthThunk are correctly implemented and imported.