Javascript - Creating different state values for mapped objects

Briitz
July 26, 2023
141 views
0 votes
2 Answers

I built a star component (used material UI component) based on the mapped object, but the star rating shows the same value when I click on any of them. How can I make each star rating have its own value based on the selection? I want each star section to show its own value.

import * as React from "react";
import Rating from "@mui/material/Rating";
import Box from "@mui/material/Box";
import "./styles.css";

const data = [
  {
    id: 1,
    label: "Do you like"
  },
  {
    id: 2,
    label: "How do you use"
  },
  {
    id: 3,
    label: "Do you dislike"
  }
];

export default function HoverRating() {
  const [value, setValue] = React.useState(2);

  return (
    <Box sx={{ width: 200, alignItems: "center" }}>
      {data.map((rate, id) => ( 
        <div>
          <p>{rate.label}</p>
          <div className="rating">
            <Rating
              value = {rate.value}
              max = {10}
              onChange = {(event, newValue) => {
                setValue(newValue);
              }}
            />
            <p>{value}</p>
          </div>
        </div>
      ))}
    </Box>
  );
}

link on codesandbox

Answers

create a resusable component

import * as React from "react";
import Rating from "@mui/material/Rating";
import Box from "@mui/material/Box";
import "./styles.css";

const data = [
  {
    id: 1,
    label: "Do you like"
  },
  {
    id: 2,
    label: "How do you use"
  },
  {
    id: 3,
    label: "Do you dislike"
  }
];

export default function HoverRating() {


  return (
    <Box
      sx={{
        width: 200,
        alignItems: "center"
      }}
    >
      {data.map((rate, id) => (
        <RatingComponent rate={rate}/>
       
      ))}
    </Box>
  );
}

function RatingComponent ({rate}) {

  const [value, setValue] = React.useState(2);

  return (
    <div>
    <p>{rate.label}</p>
    <div className="rating">
      {" "}
      <Rating
        value={rate.value}
        max={10}
        onChange={(event, newValue) => {
          setValue(newValue);
        }}
      />
      <p>{value} </p>
    </div>
  </div>
  )
}

Instead of storing only a single "global" rating value, store the data array into state and selectively update the appropriate rating object.

Example:

const data = [
  {
    id: 1,
    label: "Do you like",
    rating: 0
  },
  {
    id: 2,
    label: "How do you use",
    rating: 0
  },
  {
    id: 3,
    label: "Do you dislike",
    rating: 0
  }
];

export default function HoverRating() {
  const [ratings, setRatings] = React.useState(data);

  return (
    <Box
      sx={{
        width: 200,
        alignItems: "center"
      }}
    >
      {ratings.map((rate, index) => (
        <div>
          <p>{rate.label}</p>

          <div className="rating">
            <Rating
              value={rate.value}
              max={10}
              onChange={(event, rating) => {
                // shallow copy array and update specific index
                setRatings((ratings) => ratings.with(index, { ...rate, rating }));
              }}
            />
            <p>{rate.rating}</p>
          </div>
        </div>
      ))}
    </Box>
  );
}

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Javascript – Creating different state values for mapped objects

Answers