隐藏块的按钮 - 卡片不起作用JS

Question

有卡片，点击勾号，卡片横飞，点击十字，卡片翻到正确答案。在这一边有一个按钮，当你点击卡片飞到一边时，以及当你点击复选标记时。我对最后一点有疑问。如何使当您单击卡片背面的班级旁边的按钮时，活动卡片向侧面飞行？ https://jsfiddle.net/kyen9gsw/

'use strict';

var quizcardContainer = document.querySelector('.quizcard');
var allCards = document.querySelectorAll('.flip-card');
var nope = document.getElementById('nope');
var love = document.getElementById('love');
var next = document.getElementById('next');

function initCards(card, index) {
  var newCards = document.querySelectorAll('.flip-card:not(.removed)');

  newCards.forEach(function (card, index) {
    card.style.zIndex = allCards.length - index;
    card.style.opacity = (10 - index) / 10;
  });
  
  quizcardContainer.classList.add('loaded');
}

initCards();

function createButtonListener(love) {
  return function (event) {
    var cards = document.querySelectorAll('.flip-card:not(.removed)');
    var moveOutWidth = document.body.clientWidth * 0.3;

    if (!cards.length) return false;

    var card = cards[0];

    card.classList.add('removed');

    if (love) {
      card.style.transform = 'translate(' + moveOutWidth + 'px, -900px) rotate(0deg)';
    } else if (nope){
      card.classList.toggle('do-flip');
      document.querySelectorAll('next').onclick = function() {
        card.style.transform = 'translate(' + moveOutWidth + 'px, 900px)';
  };
    } 

    initCards();

    event.preventDefault();
  };
}



var nopeListener = createButtonListener(false);
var loveListener = createButtonListener(true);

nope.addEventListener('click', nopeListener);
love.addEventListener('click', loveListener);

 

.quizcard {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: -webkit-box;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
          flex-direction: column;
  position: relative;
  opacity: 0;
  -webkit-transition: opacity 0.1s ease-in-out;
  transition: opacity 0.1s ease-in-out;
}

.loaded.quizcard {
  opacity: 1;
}

.quizcard--status {
  position: absolute;
  top: 50%;
  margin-top: -30px;
  z-index: 2;
  width: 100%;
  text-align: center;
  pointer-events: none;
}

.quizcard--status i {
  font-size: 100px;
  opacity: 0;
  -webkit-transform: scale(0.3);
          transform: scale(0.3);
  -webkit-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out;
  position: absolute;
  width: 100px;
  margin-left: -50px;
}

.quizcard_love .fa-check {
  opacity: 0.7;
  -webkit-transform: scale(1);
          transform: scale(1);
}

.quizcard_nope .fa-remove {
  opacity: 0.7;
  -webkit-transform: scale(1);
          transform: scale(1);
}

.quizcard--cards {
  -webkit-box-flex: 1;
          flex-grow: 1;
  padding-top: 40px;
  text-align: center;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
          justify-content: center;
  -webkit-box-align: end;
          align-items: flex-end;
  z-index: 1;
}

.quizcard--buttons {
  -webkit-box-flex: 0;
          flex: 0 0 100px;
  text-align: center;
  padding-top: 20px;
}

.quizcard--buttons button {
  border-radius: 50%;
  line-height: 60px;
  width: 60px;
  border: 0;
  background: #FFFFFF;
  display: inline-block;
  margin: 0 8px;
  background: #000;
}

.quizcard--buttons button:focus {
  outline: 0;
}

.quizcard--buttons i {
  font-size: 32px;
  vertical-align: middle;
}

.fa-check {
  color: #089404;
}

.fa-remove {
  color: red;
}

.flip-card {
  display: inline-block;
  width: 90vw;
  max-width: 400px;
  height: 70vh;
  text-align: center;
  margin: 50px auto;
  position: absolute;
  -o-transition: all 1s ease-in-out;
  -webkit-transition: all 1s ease-in-out;
  -ms-transition: all 1s ease-in-out;
  transition: all 1s ease-in-out;
  -o-transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  -ms-transform-style: preserve-3d;
  transform-style: preserve-3d;

}
.do-flip {
  -o-transform: rotateY(-180deg);
  -webkit-transform: rotateY(-180deg);
  -ms-transform: rotateY(-180deg);
  transform: rotateY(-180deg);
}

.flip-card .flip-card-front, .flip-card-back{
  width: 100%;
  height: 100%;
  position: absolute;
  -o-backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  -ms-backface-visibility: hidden;
  backface-visibility: hidden;
  z-index: 2;
  -webkit-box-shadow: 5px 6px 32px 2px rgba(133,133,133,0.71);
  -moz-box-shadow: 5px 6px 32px 2px rgba(133,133,133,0.71);
  box-shadow: 5px 6px 32px 2px rgba(133,133,133,0.71);
}
.flip-card .flip-card-front {
    background: lightgreen;
    border:1px solid grey;
}
.flip-card .flip-card-back {
    background: lightblue;
    border: 1px solid grey;
    -o-transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
    -ms-transform: rotateY(180deg);
    transform: rotateY(180deg);
    height: 100%;
}

<link rel='stylesheet' href='https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css'>
<div class="quizcard">
  <div class="quizcard--cards">
<div class="flip-card">
  <div class="flip-card-front"><p>Front1</p></div>
  <div class="flip-card-back"><p>Back1</p><button class="next">flip</button></div>
</div>
<div class="flip-card">
  <div class="flip-card-front"><p>Front2</p></div>
  <div class="flip-card-back"><p>Back2</p><button class="next">flip</button></div>
</div>
<div class="flip-card">
  <div class="flip-card-front"><p>Front3</p></div>
  <div class="flip-card-back"><p>Back3</p><button class="next">flip</button></div>
</div>
<div class="flip-card">
  <div class="flip-card-front"><p>Front4</p></div>
  <div class="flip-card-back"><p>Back4</p><button class="next">flip</button></div>
</div>
<div class="flip-card">
  <div class="flip-card-front"><p>Front5</p></div>
  <div class="flip-card-back"><p>Back5</p><button class="next">flip</button></div>
</div>

  </div>

  <div class="quizcard--buttons">
    <button id="nope"><i class="fa fa-remove"></i></button>
    <button id="love"><i class="fa fa-check"></i></button>
  </div>
</div>

Answer 1

在 JS 中向类添加事件时，您应该使用 getElementsByClassName 而不是 getElementById。

试试这个代码

document.getElementsByClassName('next').onclick = function() { document.getElementById('flip-card').classList.toggle('do-flip'); };