我正在創建一個需要回答每個答案的測驗。問題是如果您沒有答案，您應該能夠跳過問題。每次按下一步時，我都會嘗試設定默認答案，因此當我嘗試跳過一個時，我不必回答它即可獲得價值。我想要的默認值是每次我陣列的最后一個值。
下一個和上一個問題
SetQuestion(question) {
if (this.questionNumber >= 0) {
let oldAnswerButton = document.querySelectorAll('.filter_anwser');
// Deletes old question when the next question is clicked
for (let answerButton of oldAnswerButton) {
answerButton.style.display = 'none';
}
}
this.questionNumber = question;
let q = this.quiz[question];
// Check if your at the last question so the next button will stop being displayed.
if (this.questionNumber === Quiz.length - 1) {
this.nextbtn.style.display = 'none';
this.prevbtn.style.display = 'block';
this.resultbtn.style.display = 'grid';
} else if (this.questionNumber === 0) {
this.nextbtn.style.display = 'block';
this.prevbtn.style.display = 'none';
this.resultbtn.style.display = 'none';
} else {
this.nextbtn.style.display = 'block';
this.prevbtn.style.display = 'block';
this.resultbtn.style.display = 'none';
}
// Displays Question
this.questionName.textContent = q.questionText;
this.questionName.id = "questionID";
return q;
console.log(this.getLink())
console.log(this.tmp)
}
IntoArray() {
const UrlVar = new URLSearchParams(this.getLink())
this.UrlArray = [...UrlVar.entries()].map(([key, values]) => (
{[key]: values.split(",")}
)
);
}
NextQuestion() {
// let quizUrl = this.url[this.questionNumber];
let question = this.SetQuestion(this.questionNumber 1);
let pre = question.prefix;
let prefixEqual = pre.replace('=', '');
let UrlArr = this.UrlArray;
let UrlKeys = UrlArr.flatMap(Object.keys)
let answers = question.chosenAnswer.slice(0, -1);
this.clicked = true;
// Displays answers of the questions
for (let y = 0; y < answers.length; y ) {
let item = answers[y];
// Display answer buttons
if (UrlKeys.includes(prefixEqual)) {
console.log("exists");
let btn = document.querySelector('button[value="' item.id '"]');
btn.style.display = 'block';
} else {
let btn = document.createElement('button');
btn.value = item.id;
btn.classList.add("filter_anwser", pre)
btn.id = 'answerbtn';
btn.textContent = item.name;
this.button.appendChild(btn);
}
// let quizUrl = control.url[control.questionNumber];
// // console.log(this.tmp);
// if (quizUrl === undefined) {
// quizUrl.push(question.prefix[y] '');
// }
// if (quizUrl === undefined){
// this.tmp.push('');
// }
}
this.IntoArray();
}
PrevQuestion() {
let question = this.SetQuestion(this.questionNumber - 1);
let answers = question.chosenAnswer.slice(0, -1);
// Displays answers of the questions
for (let y = 0; y < answers.length; y ) {
let item = answers[y];
// Display answer buttons
let btn = document.querySelector('button[value="' item.id '"]');
btn.style.display = 'block';
}
this.IntoArray();
}
鏈接創建者：
/**
* Returns the parameters for the URL.
*
* @returns {string}
*/
getLink() {
this.tmp = [];
for (let i = 0; i < this.url.length; i ) {
// Check if question is from the same quiz part and adds a , between chosen answers and add the right prefix at the beginning
if (this.url[i].length > 0) {
this.tmp.push("" Quiz[i].prefix this.url[i].join(","))
// console.log(this.url)
}
if (this.url[i].length === 0) {
this.tmp.push("");
}
}
/// If answers are from different quiz parts add a & between answers.
return "" this.tmp.join("&");
// console.log(this.url[i].prefix);
};
回答點擊事件
control.button.addEventListener("click", function (e) {
const tgt = e.target;
control.clicked = true;
// clear the url array if there's nothing clicked
if (control.url.length === control.questionNumber) {
control.url.push([]);
}
let quizUrl = control.url[control.questionNumber];
// Check if a button is clicked. Changes color and adds value to the url array.
if (quizUrl.indexOf(tgt.value) === -1) {
quizUrl.push(tgt.value);
e.target.style.backgroundColor = "orange";
// Check if a button is clicked again. If clicked again changes color back and deletes value in the url array.
} else {
quizUrl.splice(quizUrl.indexOf(tgt.value), 1);
e.target.style.backgroundColor = "white";
}
console.log(control.getLink());
console.log(quizUrl)
})
大批：
class QuizPart {
constructor(questionText, chosenAnswer, prefix, questionDescription) {
this.questionText = questionText;
this.chosenAnswer = chosenAnswer;
this.prefix = prefix;
this.questionDescription = questionDescription;
}
}
class ChosenAnswer {
constructor(id, name) {
this.id = id;
this.name = name;
}
}
let Quiz = [
new QuizPart('Whats your size?', [
new ChosenAnswer('6595', '41'),
new ChosenAnswer('6598', '42'),
new ChosenAnswer('6601', '43'),
new ChosenAnswer('', ''),
], 'bd_shoe_size_ids=',
'The size of your shoes is very important. If you have the wrong size, they wont fit.'),
new QuizPart('What color would you like?', [
new ChosenAnswer('6053', 'Red'),
new ChosenAnswer('6044', 'Blue'),
new ChosenAnswer('6056', 'Yellow'),
new ChosenAnswer('6048', 'Green'),
new ChosenAnswer('', ''),
], 'color_ids=',
'Color isn t that important, It looks good tho.'),
new QuizPart('What brand would you like?', [
new ChosenAnswer('5805', 'Adidas'),
new ChosenAnswer('5866', 'Nike'),
new ChosenAnswer('5875', 'Puma'),
new ChosenAnswer('', ''),
], 'manufacturer_ids=',
'Brand is less important. Its just your own preference'),
]
我嘗試為陣列的鏈接創建者和我的事件監聽器提供一個默認值，并在我從我的一個按鈕獲得實際值時替換它，但它只是不起作用。有誰能夠幫我？
uj5u.com熱心網友回復：
我知道，這可能與您對答案的期望相差甚遠——但是您為什么不看看像 Vue 這樣的反應式工具呢？它具有執行此類任務可能需要的所有工具，甚至更多：
- 整個測驗可以抽象為一個簡單的物件陣列（問題）
- next, prev，設定默認答案變得輕而易舉
- 易于擴展（有問題）
- 易于更新（模板、功能等）
Vue.component('QuizQuestion', {
props: ['data', 'selected'],
computed: {
valSelected: {
get() {
return this.selected
},
set(val) {
this.$emit('update:selected', val)
}
},
},
template: `
<div>
{{ data.text }}<br />
{{ data.description }}<br />
<div >
<label
v-for="val in data.options"
:key="val[0]"
>
<input
type="radio"
:name="data.text"
:value="val"
v-model="valSelected"
/>
{{ val[1] }}
</label>
</div>
</div>
`
})
new Vue({
el: "#app",
computed: {
currentQuestion() {
return this.questions[this.current]
},
hasPrev() {
return !!this.current
},
hasNext() {
return this.current < this.questions.length - 1
},
},
data() {
return {
current: 0,
questions: [{
text: 'Whats your size?',
description: 'The size of your shoes is very important. If you have the wrong size, they wont fit.',
options: [
['6595', '41'],
['6598', '42'],
['6601', '43'],
['', ''],
],
selected: null,
}, {
text: 'What color would you like?',
description: 'Color isn\'t that important, It looks good tho.',
options: [
['6053', 'Red'],
['6044', 'Blue'],
['6056', 'Yellow'],
['6048', 'Green'],
['', ''],
],
selected: null,
}, {
text: 'What brand would you like?',
description: 'Brand is less important. Its just your own preference',
options: [
['5805', 'Adidas'],
['5866', 'Nike'],
['5875', 'Puma'],
['', ''],
],
selected: null,
}, ],
}
},
methods: {
selectDefault() {
this.questions[this.current] = {
...this.questions[this.current],
selected: this.questions[this.current].options.slice(-1)[0],
}
},
getPrev() {
if (this.hasPrev) {
if (!this.currentQuestion.selected) {
this.selectDefault()
}
this.current -= 1
}
},
getNext() {
if (this.hasNext) {
if (!this.currentQuestion.selected) {
this.selectDefault()
}
this.current = 1
}
},
},
template: `
<div>
<quiz-question
:data="currentQuestion"
:selected.sync="currentQuestion.selected"
/><br />
<button v-if="hasPrev" @click="getPrev">PREV</button>
<button v-if="hasNext" @click="getNext">NEXT</button>
<button v-if="!hasNext">RESULT</button>
</div>
`
}).quiz-options {
display: flex;
flex-direction: column;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="app"></div>編輯
但是，如果不使用框架/庫，這里有一個更面向物件的方法：
class Quiz {
constructor(questions) {
this._current = 0
this._questions = questions
}
get current() {
return this._current
}
set current(val) {
this._current = val
}
get hasNext() {
return this.current < this.questions.length - 1
}
get hasPrev() {
return !!this.current
}
get questions() {
return this._questions
}
get next() {
this.current = this.hasNext ? this.current 1 : this.current
return this.currentQuestion
}
get prev() {
this.current = this.hasPrev ? this.current - 1 : this.current
return this.currentQuestion
}
get currentQuestion() {
return this.questions[this.current]
}
}
class Question {
constructor({
text,
description,
options,
prefix,
}) {
this.text = text
this.desc = description
this.prefix = prefix
this._options = options.map(([key, val]) => ({
id: key,
value: [key, val],
selected: false,
}))
}
get options() {
return this._options
}
set options(newOptions) {
this._options = newOptions
}
get selected() {
return this.options.find(({
selected
}) => !!selected)
}
set selected(selectedVal) {
this.options = [...this.options.map(({
value: [key, val],
selected,
...rest
}) => {
return {
...rest,
value: [key, val],
selected: key === selectedVal
}
})]
}
get lastOption() {
return this.options.slice(-1)[0]
}
setDefault() {
if (!this.selected) {
this.selected = this.lastOption.id
}
}
}
const urlParser = (quiz) => {
return quiz.questions.map(({
prefix,
selected = {
value: ['']
}
}) => {
const s = selected.value[0] ? selected.value[0] : ''
return `${prefix}${s}`
}).join('&')
}
const qArr = [{
text: 'text1',
description: 'desc1',
options: [
['1_1', '11'],
['1_2', '12'],
['1_3', '13'],
],
prefix: 'prefix_1_',
},
{
text: 'text2',
description: 'desc2',
options: [
['2_1', '21'],
['2_2', '22'],
['2_3', '23'],
],
prefix: 'prefix_2_',
},
{
text: 'text3',
description: 'desc3',
options: [
['3_1', '31'],
['3_2', '32'],
['3_3', '33'],
],
prefix: 'prefix_3_',
},
]
const getOptionsHtml = ({
text,
options
}) => {
let html = ''
options.forEach(({
id,
value,
selected
}, i) => {
html = `
<label>
<input
type="radio"
name="${text}"
value="${value[0]}"
${selected ? 'checked' : ''}
/>
${value[1]}
</label>
`
})
return html
}
const getSingleQuestionHtml = (q) => {
const optionsHtml = getOptionsHtml({
text: q.text,
options: q.options
})
return `
${q.text}<br />
${q.desc}<br />
${optionsHtml}
`
}
const registerEventHandlers = ({
container,
question
}) => {
const radioBtns = document.querySelectorAll('.question-input')
radioBtns.forEach((input, i) => {
input.addEventListener('change', function(e) {
question.selected = e.target.value
})
})
}
const updateHtml = ({
container,
question
}) => {
container.innerHTML = getSingleQuestionHtml(question)
registerEventHandlers({
container,
question
})
};
const updateContainer = (container) => (question) => updateHtml({
container,
question
});
const setElDisplay = ({
el,
display
}) => {
if (display) {
el.classList.add("d-inline-block")
el.classList.remove("d-none")
} else {
el.classList.remove("d-inline-block")
el.classList.add("d-none")
}
}
const updateBtnVisibility = ({
btnNext,
btnPrev,
btnResult,
quiz
}) => () => {
setElDisplay({
el: btnNext,
display: quiz.hasNext
})
setElDisplay({
el: btnResult,
display: !quiz.hasNext
})
setElDisplay({
el: btnPrev,
display: quiz.hasPrev
})
}
(function() {
const quiz = new Quiz(qArr.map(q => new Question(q)))
const container = document.getElementById('quiz-container')
updateQuizContainer = updateContainer(container)
updateQuizContainer(quiz.currentQuestion)
const btnPrev = document.getElementById('btn-prev')
const btnNext = document.getElementById('btn-next')
const btnResult = document.getElementById('btn-result')
const updateBtns = updateBtnVisibility({
btnPrev,
btnNext,
btnResult,
quiz
})
updateBtns()
btnPrev.addEventListener('click', function() {
if (quiz.hasPrev) {
quiz.currentQuestion.setDefault()
}
updateQuizContainer(quiz.prev)
updateBtns()
})
btnNext.addEventListener('click', () => {
if (quiz.hasNext) {
quiz.currentQuestion.setDefault()
}
updateQuizContainer(quiz.next)
updateBtns()
})
btnResult.addEventListener('click', function() {
quiz.currentQuestion.setDefault()
console.log(urlParser(quiz))
})
})();.d-inline-block {
display: inline-block;
}
.d-none {
display: none;
}<div id="quiz-container"></div>
<div id="quiz-controls">
<button id="btn-prev" class="d-inline-block">
PREV
</button>
<button id="btn-next" class="d-inline-block">
NEXT
</button>
<button id="btn-result" class="d-none">
RESULT
</button>
</div>
<div id="result"></div>轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/413837.html
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