質問編集履歴
3
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；。。。。。。。。。。。。。。。。。。。あああ
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削除します。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
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；。。。。。。。。。。。。。。。。。。。
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JavaScriptとHTMLを使った10回クイズの問題を作っているさいのエラーハンドリング
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を行いたいのですがうまくいきません。
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### 該当のソースコード
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```JavaScript
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{
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const API_URL = 'https://opentdb.com/api.php?amount=10';
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class Quiz {
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constructor(quizData) {
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this._quizzes = quizData.results;
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this._correctAnswersNum = 0;
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}
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getQuizCategory(index) {
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return this._quizzes[index - 1].category;
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}
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getQuizDifficulty(index) {
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return this._quizzes[index - 1].difficulty;
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}
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getNumOfQuiz() {
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return this._quizzes.length;
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}
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getQuizQuestion(index) {
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return this._quizzes[index - 1].question;
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}
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getCorrectAnswer(index) {
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return this._quizzes[index - 1].correct_answer;
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}
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getIncorrectAnswers(index) {
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return this._quizzes[index - 1].incorrect_answers;
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}
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countCorrectAnswersNum(index, answer) {
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const correctAnswer = this._quizzes[index - 1].correct_answer;
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if (answer === correctAnswer) {
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return this._correctAnswersNum++;
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}
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}
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getCorrectAnswersNum() {
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return this._correctAnswersNum;
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}
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}
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const titleElement = document.getElementById('title');
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const questionElement = document.getElementById('question');
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const answersContainer = document.getElementById('answers');
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const startButton = document.getElementById('start-button');
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const genreElement = document.getElementById('genre');
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const difficultyElement = document.getElementById('difficulty');
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startButton.addEventListener('click', () => {
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startButton.hidden = true;
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fetchQuizData(1);
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});
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const fetchQuizData = async (index) => {
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titleElement.textContent = '取得中';
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questionElement.textContent = '少々お待ち下さい';
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const response = await fetch(API_URL);
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const quizData = await response.json();
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const quizInstance = new Quiz(quizData);
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setNextQuiz(quizInstance, index);
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};
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const setNextQuiz = (quizInstance, index) => {
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while (answersContainer.firstChild) {
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answersContainer.removeChild(answersContainer.firstChild);
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}
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if (index <= quizInstance.getNumOfQuiz()) {
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makeQuiz(quizInstance, index);
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} else {
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finishQuiz(quizInstance);
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}
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};
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const makeQuiz = (quizInstance, index) => {
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titleElement.innerHTML = `問題 ${index}`;
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genreElement.innerHTML = `【ジャンル】 ${quizInstance.getQuizCategory(index)}`;
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difficultyElement.innerHTML = `【難易度】 ${quizInstance.getQuizDifficulty(index)}`;
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questionElement.innerHTML = `【クイズ】${quizInstance.getQuizQuestion(index)}`;
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const answers = buildAnswers(quizInstance, index);
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answers.forEach((answer) => {
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const answerElement = document.createElement('li');
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answersContainer.appendChild(answerElement);
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const buttonElement = document.createElement('button');
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buttonElement.innerHTML = answer;
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answerElement.appendChild(buttonElement);
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buttonElement.addEventListener('click', () => {
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quizInstance.countCorrectAnswersNum(index, answer);
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index++;
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setNextQuiz(quizInstance, index);
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});
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});
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};
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const finishQuiz = (quizInstance) => {
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titleElement.textContent = `あなたの正答数は${quizInstance.getCorrectAnswersNum()}です`
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genreElement.textContent = '';
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difficultyElement.textContent = '';
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questionElement.textContent = '再チャレンジしたい場合は下をクリック';
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const restartButton = document.createElement('button');
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restartButton.textContent = 'ホームに戻る';
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answersContainer.appendChild(restartButton);
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restartButton.addEventListener('click', () => {
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location.reload();
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});
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};
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const buildAnswers = (quizInstance, index) => {
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const answers = [
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quizInstance.getCorrectAnswer(index),
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...quizInstance.getIncorrectAnswers(index)
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];
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return shuffleArray(answers);
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};
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const shuffleArray = ([...array]) => {
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for (let i = array.length - 1; i >= 0; i--) {
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const j = Math.floor(Math.random() * (i + 1));
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[array[i], array[j]] = [array[j], array[i]];
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}
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return array;
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};
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}
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```
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```html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<div class="container"></div>
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<h1 id="title">ようこそ</h1>
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<h4 id="genre"></h4>
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<h4 id="difficulty"></h4>
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<p id="question"><hr>以下のボタンをクリック<hr></p>
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<button id="start-button">開始</button>
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</div>
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<div id="answers"></div>
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<script src="app.js"></script>
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</body>
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</html>
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328
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329
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```
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330
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331
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###エラーハンドリングをしたと思われる箇所
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332
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333
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```
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334
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335
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const response = await fetch(API_URL);
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336
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337
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const quizData = await response.json();
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338
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339
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const quizInstance = new Quiz(quizData);
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340
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341
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```
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342
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343
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344
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345
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### 試したこと
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346
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347
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以下のコードのように成功時のコードを記述の欄にそのま該当コード
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348
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349
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を記述してみましたがう甘く作動しませんでした。
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350
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351
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352
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```
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354
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355
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fetch(API_URL, {
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356
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method: 'GET'
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358
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})
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360
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361
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.then(response => {
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if (!response.ok) {
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console.error('サーバーエラー');
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}
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368
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369
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//成功時のコードを記述
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370
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371
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const response = await fetch(API_URL);
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372
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373
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const quizData = await response.json();
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374
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375
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const quizInstance = new Quiz(quizData);
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376
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377
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})
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378
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379
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.catch(error => {
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380
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381
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console.error('通信に失敗しました', error);
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382
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383
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});
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384
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-
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385
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-
```
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386
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-
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387
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また新しくコードを書いてみましたが何も変化が起きず成功したいるのか、
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388
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-
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389
|
-
分かりません。
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|
390
|
-
|
|
391
|
-
```
|
|
392
|
-
|
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393
|
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fetch('https://opentdb.com/api.php?amount=10')
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394
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-
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395
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.then((response) => response.text())
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396
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397
|
-
.then((text) => console.log(text))
|
|
398
|
-
|
|
399
|
-
.catch((error) => console.log(error));
|
|
400
|
-
|
|
401
|
-
fetch('file.txt')
|
|
402
|
-
|
|
403
|
-
.then((response) => {
|
|
404
|
-
|
|
405
|
-
if(response.ok) { // ステータスがokならば
|
|
406
|
-
|
|
407
|
-
return response.text(); // レスポンスをテキストとして変換する
|
|
408
|
-
|
|
409
|
-
} else {
|
|
410
|
-
|
|
411
|
-
throw new Error();
|
|
412
|
-
|
|
413
|
-
}
|
|
414
|
-
|
|
415
|
-
})
|
|
416
|
-
|
|
417
|
-
.then((text) => console.log(text))
|
|
418
|
-
|
|
419
|
-
.catch((error) => console.log(error));
|
|
420
|
-
|
|
421
|
-
|
|
422
|
-
|
|
423
|
-
|
|
424
|
-
|
|
425
|
-
|
|
426
|
-
|
|
427
|
-
setNextQuiz(quizInstance, index);
|
|
428
|
-
|
|
429
|
-
```
|
|
430
|
-
|
|
431
|
-
上手にエラーハンドリングできる方法を教えていただきたいです
|
|
432
|
-
|
|
433
|
-
|
|
434
|
-
|
|
435
|
-
### 補足
|
|
436
|
-
|
|
437
|
-
まだ始めたばかりで頭の悪い質問のなってしまい申し訳ございません
|
|
438
|
-
|
|
439
|
-
ヒントでも良いのでおしえもらいたいです。
|
1
誤字
test
CHANGED
|
@@ -1 +1 @@
|
|
|
1
|
-
|
|
1
|
+
間違いです。。。。。。
|
test
CHANGED
|
File without changes
|