CODEWITHSUNDEEP
javascriptreactjsarray.prototype.map
wujovic
wujovic

Reputation: 67

Cant render API data, .map error using Google Books API

Pretty new to React, still learning. I was trying to make this Book Finder app using Google Books API, and then when I wanted to map the data, first time everything worked perfectly, but after that one time I started getting this error:

Error

Keep in mind that the first time I ran the code everything worked, I was even fixing some CSS properties and it re-rendered fine. I tried a lot of things, I do know that you can't use .map on objects, and I checked, the API data was and object.

Result of typeof() for the given API data Result of typeof() for the given API data

Heres the code:

MainContainer.tsx

import { useState } from "react";
import List from "./List";
import Search from "./Search";
import request from "superagent";

export default function MainContainer() {

    const [books, setBooks] = useState([]);

    function handleChange(e: any) {
        setBooks(e.target.value);
    }

    function handleSearch(e: any) {
        e.preventDefault();
        request
            .get("https://www.googleapis.com/books/v1/volumes")
            .query({ q: setBooks })
            .then((data) => {
                setBooks([...books])
            })
    }

    return (
        <div className="main-container">
            <Search
                handleChange={handleChange}
                handleSearch={handleSearch}
            />
            <List books={books}/>
        </div>
    )
}

List.tsx

import Card from "./Card"

export default function List(props: any) {

    return (
        <div className="list-container">

            {

                props.books && props.books.length > 0 ?
                    props.books.map(function (book: any) {
                        return (
                            <Card
                                key={book.id}
                                image={book.volumeInfo.imageLinks.smallThumbnail}
                                title={book.volumeInfo.title}
                                author={book.volumeInfo.authors}
                                published={book.volumeInfo.publishedDate}
                            />
                        )
                    }) : <p className="np-data">No books yet...</p>
            }

        </div>
    )
}

Card.tsx

export default function Card(props: any) {
    return (
        <div className="card">

            <img src={props.image} alt="" />
            <div className="card-desc">

                <h3 className="title">{props.title}</h3>
                <h4 className="author">{props.author}</h4>
                <p className="published">{props.published}</p>

            </div>

        </div>
    )
}

Again, I'm still learning React, this might be some dumb-typo-begginer error so yeah. Thanks in advance!

Upvotes: 0

Views: 101

Answers (1)

Ali Nauman
Ali Nauman

Reputation: 1677

The problem is that you have two pieces of state here (the search query and the list of books), but you are using a single variable (books) to keep track of both.

In the MainContainer component, add this to create another state variable.

const [query, setQuery] = useState('');

Update handleChange to this to update the search query variable.

function handleChange(e: any) {
  setQuery(e.target.value);
}

Update handleSearch to this to make a request with the last entered query and correctly set the books state variable.

function handleSearch(e: any) {
  e.preventDefault();
  request
    .get("https://www.googleapis.com/books/v1/volumes")
    .query({ q: query})
    .then((data) => {
      setBooks(data.items)
    })
 }

It should work as expected now.

Upvotes: 1

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