I am unable to display the answer buttons and organize them accordingly within my project

Question

I am unable to display the answer buttons and organize them accordingly within my project

I'm currently working on a quiz project where I fetch an API containing quiz questions and answers. The API provides an array of wrong answers (3) along with one correct answer. My goal is to display these options as buttons, so I decided to push the correct answer into the wrong answers array, randomize them, and present them as choices. However, I encountered an error stating that the array of answers is not iterable. Can anyone assist me in resolving this issue and confirm if my approach is correct?


import './App.css';
import axios from 'axios'
import {useState,useEffect} from 'react'

function App() {
  const [quiz,setQuiz] = useState([])
  const [answer,setAnswer] = useState([])
  useEffect(()=>{
    axios.get('https://opentdb.com/api.php?amount=10')
    .then(res=>{
     
      setQuiz(res.data.results[0])
     
       setAnswer([...quiz.incorrect_answers, quiz.correct_answer])
    })
    .catch(err=>{
      console.log(err);
    })
 
  },[])



  return (
    <div className="App">
   <h1>{quiz.question}</h1>
   {answer && answer?.map(answers =>
   <button key={answers}>{answers}</button>)
  
   }
    </div>

  );
}

export default App;

javascript html css reactjs

Answer 1

Answer №1

useEffect(()=>{
    axios.get('https://opentdb.com/api.php?amount=10')
    .then(res=>{
       setQuiz(res.data.results[0])
       let tempVar = res.data.results[0] ;
       setAnswer([...tempVar.incorrect_answers, tempVar.correct_answer])
    })
    .catch(err=>{
      console.log(err);
    })
 
  },[])

Ensure your useEffect function is correctly implemented as provided above. When changing state asynchronously, it may lead to errors like 'quiz.incorrect_answers is not iterable'. Following this structure should resolve the issue you are experiencing.

Answer 2

useEffect(()=>{
    axios.get('https://opentdb.com/api.php?amount=10')
    .then(res=>{
       setQuiz(res.data.results[0])
       let tempVar = res.data.results[0] ;
       setAnswer([...tempVar.incorrect_answers, tempVar.correct_answer])
    })
    .catch(err=>{
      console.log(err);
    })
 
  },[])

Ensure your useEffect function is correctly implemented as provided above. When changing state asynchronously, it may lead to errors like 'quiz.incorrect_answers is not iterable'. Following this structure should resolve the issue you are experiencing.

Answer 3

Answer №2

When setting state, you can't use it immediately; you must await the changes to state first. To handle this properly, add a useEffect hook that runs every time the quiz changes. Your code would look something like this:

  useEffect(() => {
    axios
      .get("https://opentdb.com/api.php?amount=10")
      .then((res) => {
        setQuiz(res.data.results[0]);
      })
      .catch((err) => {
        console.log(err);
      });
  }, []);

  useEffect(() => {
    if (quiz.length > 0)
      setAnswer([...quiz.incorrect_answers, quiz.correct_answer]);
  }, [quiz]);

Alternatively, you can also use the .then function within the same useEffect to handle the state change:

useEffect(() => {
    axios
      .get("https://opentdb.com/api.php?amount=10")
      .then((res) => {
        setQuiz(res.data.results[0]);
      }).then(()=>setAnswer([...quiz.incorrect_answers, quiz.correct_answer]))
        
      .catch((err) => {
        console.log(err);
      });
  }, []);

Answer 4

When setting state, you can't use it immediately; you must await the changes to state first. To handle this properly, add a useEffect hook that runs every time the quiz changes. Your code would look something like this:

  useEffect(() => {
    axios
      .get("https://opentdb.com/api.php?amount=10")
      .then((res) => {
        setQuiz(res.data.results[0]);
      })
      .catch((err) => {
        console.log(err);
      });
  }, []);

  useEffect(() => {
    if (quiz.length > 0)
      setAnswer([...quiz.incorrect_answers, quiz.correct_answer]);
  }, [quiz]);

Alternatively, you can also use the .then function within the same useEffect to handle the state change:

useEffect(() => {
    axios
      .get("https://opentdb.com/api.php?amount=10")
      .then((res) => {
        setQuiz(res.data.results[0]);
      }).then(()=>setAnswer([...quiz.incorrect_answers, quiz.correct_answer]))
        
      .catch((err) => {
        console.log(err);
      });
  }, []);

Answer 5

Answer №3

Here's a method you can implement:

function randomizeArray(array) {
    for (let i = array.length - 1; i > 0; i--) {
        let j = Math.floor(Math.random() * (i + 1));
        let temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
    return array;
}
// Use this function to shuffle the elements of an array

const [question, setQuestion] = useState(null)
// Initialize 'question' with a null value, handle null case in rendering component
const [correctAnswer, setCorrectAnswer] = useState([])
// Store correct answer as string
const [incorrectAnswers, setIncorrectAnswers] = useState([])
// Store incorrect answers as an array

let allAnswers = [];
useEffect(() => {
    axios.get('https://opentdb.com/api.php?amount=10')
        .then(res => {
    
        setQuestion(res.data.results[0])
    
        setCorrectAnswer([res.data.results[0].correct_answer])
        setIncorrectAnswers(res.data.results[0].incorrect_answers);
        // Update values after API call success
    })
    .catch(err => {
        console.log(err);
    })

}, [])

Next, check if the question has been loaded before displaying it:

<h1>{question ? question.question : 'Loading question...'}</h1>
// Display the question only after loading
{
    allAnswers = correctAnswer && incorrectAnswers ? randomizeArray(correctAnswer.concat(incorrectAnswers)) : ''
// Merge correct and incorrect answers arrays, then shuffle them
}
{
    allAnswers?.map(answer =>
    <button key={answer}>{answer}</button>)
}

Answer 6

Here's a method you can implement:

function randomizeArray(array) {
    for (let i = array.length - 1; i > 0; i--) {
        let j = Math.floor(Math.random() * (i + 1));
        let temp = array[i];
        array[i] = array[j];
        array[j] = temp;
    }
    return array;
}
// Use this function to shuffle the elements of an array

const [question, setQuestion] = useState(null)
// Initialize 'question' with a null value, handle null case in rendering component
const [correctAnswer, setCorrectAnswer] = useState([])
// Store correct answer as string
const [incorrectAnswers, setIncorrectAnswers] = useState([])
// Store incorrect answers as an array

let allAnswers = [];
useEffect(() => {
    axios.get('https://opentdb.com/api.php?amount=10')
        .then(res => {
    
        setQuestion(res.data.results[0])
    
        setCorrectAnswer([res.data.results[0].correct_answer])
        setIncorrectAnswers(res.data.results[0].incorrect_answers);
        // Update values after API call success
    })
    .catch(err => {
        console.log(err);
    })

}, [])

Next, check if the question has been loaded before displaying it:

<h1>{question ? question.question : 'Loading question...'}</h1>
// Display the question only after loading
{
    allAnswers = correctAnswer && incorrectAnswers ? randomizeArray(correctAnswer.concat(incorrectAnswers)) : ''
// Merge correct and incorrect answers arrays, then shuffle them
}
{
    allAnswers?.map(answer =>
    <button key={answer}>{answer}</button>)
}

I am unable to display the answer buttons and organize them accordingly within my project

Answer №1

Answer №2

Answer №3

Similar questions

"Utilizing CSS exclusively in conjunction with a PHP API for seamless integration

Elegant Bootstrap 4 Carousel featuring a glimpse of the upcoming slide alongside the primary carousel item

Is it feasible to achieve a full 100% screen width within a confined div using relative positioning?

Making a Request on Behalf of a Component in Vue.js Using Interceptors

Tutorial on how to update a specific value in an array of objects using setState on click event

Determine the placement of a <div> based on information stored in localStorage

Error occurred during NextJs deployment due to an issue with the getStaticPath function: An unexpected token "<" was found in the JSON at position 0 while trying to parse it

When the Button is clicked, the component utilizing the Router fails to appear

Retrieving Array keys from PHP using jQuery

Tips for implementing personalized command buttons in Kendo Grid with AJAX request utilizing JavaScript

The AngularJS factory does not hold on to its value

Tips for selecting a dropdown item that shares the same data-testid

Switching image sources using jQuery on click

Utilize ethereumjs-wallet in your web browser as a standalone module

Invoking a synchronous JavaScript request to an MVC 4 Controller function

Using JSON parsing to dynamically create classes with preloaded background images

Unusual margin that demands attention!

When using `npm list`, the `create-react-app` package does not appear in the list of installed packages

Upon clicking a button, initiate an Ajax call to retrieve a value from the code behind (aspx.cs) and display it in an input field on the same page

Prevent my buttons from altering their color when hovered over