在语言面板中切换图像（标志）

Question

我有一个语言面板，其中一个image（main-image）显示页面加载时的状态。我还有另外三个image's，它们在页面加载时被隐藏。

问题是当点击其他image's之一时如何切换主图像。我需要点击image来切换主图像。

这里是Codepen

我的第一次尝试

let menuBtn = document.getElementById("menu-btn");
menuBtn.addEventListener("click", ()=>{
    let mainBtnImg = document.getElementById("main-btn-img");
    let otherThreeImg = document.querySelectorAll(".menu-img");
    for(let i = 0;i< otherThreeImg.length; i++){
        mainBtnImg.src = otherThreeImg[this].src;
    }
})

第二次尝试

仅更改了该部分

mainBtnImg.src = this.otherThreeImg;

拒绝投票者请先发表评论

$(document).on('click', function (e) {
    if ($(e.target).closest(".menu-btn").length === 0) {
        $('.menu-nav').removeClass('menu-nav--open');
    }
});

$('.menu-btn').on('click', function(e){
	e.preventDefault();
	$(this).toggleClass('menu-btn--open');
	$('.menu-nav').toggleClass('menu-nav--open');
});

body, html {
  margin: 0;
}

.section {
  width: 100%;
  height: 100vh;
  background: linear-gradient(#55efc4, #ffeaa7);
  position: relative;
}

.menu-btn__wrapper {
  position: absolute;
  top: 20px;
  right: 20px;
}

.menu-btn {
  width: 50px;
  height: 50px;
  display: block;
  background-color: #fff;
  border-radius: 50%;
  position: relative;
}

.menu-block {
  display: flex;
  flex-direction: column-reverse;
}

.menu-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: .5s;
  transform-origin: top center;
  transform: scaleY(0) translateY(-20px);
  opacity: 0;
}
.menu-nav.with-border {
  background-color: #fff;
  padding-bottom: 20px;
  padding-top: 30px;
  margin-top: -40px;
  border-radius: 50px;
}
.menu-nav--open {
  transform: scaleY(1) translateY(0);
  opacity: 1;
}
.menu-nav__name {
  position: absolute;
  right: 45px;
  top: 0;
  margin: 0;
  opacity: 0;
  transition: .3s;
}
.menu-nav__name img {
  idth: 30px;
  height: 30px;
  border-radius: 50%;
}
.menu-nav__link {
  display: inline-block;
  color: #000;
  margin-top: 5px;
  transition: .4s;
  position: relative;
}

.menu-nav__img {
  width: 30px;
  height: 30px;
  display: flex;
  justify-content: center;
  margin-left: auto;
  margin-right: auto;
  padding-top: 20%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="section">
  <div class="menu-btn__wrapper">
    <div class="menu-block">
      <nav class="menu-nav with-border"><a class="menu-nav__link" href="#">
          <p class="menu-nav__name"></p></a><a class="menu-nav__link" href="#">
          <p class="menu-nav__name"></p><img class="menu-nav__img menu-img" src="https://cdn2.iconfinder.com/data/icons/world-flags-1-1/100/Britain-512.png"></a><a class="menu-nav__link" href="#">
          <p class="menu-nav__name"></p><img class="menu-nav__img menu-img" src="http://icons.veryicon.com/png/Flag/Rounded%20World%20Flags/Russia%20Flag.png"></a><a class="menu-nav__link" href="#">
          <p class="menu-nav__name"></p><img class="menu-nav__img menu-img" src="https://cdn.countryflags.com/thumbs/germany/flag-round-250.png"> </a></nav><a class="menu-btn" href="#"><img class="menu-nav__img" id="main-btn-img" src="https://cdn2.iconfinder.com/data/icons/world-flags-1-1/100/Britain-512.png"><span class="menu-btn__line"></span></a>
    </div>
  </div>
</div>

Answer 1

您需要在每个菜单项上添加onclick事件，并将主图像的src替换为被单击的那个。

$(document).on('click', function (e) {
    if ($(e.target).closest(".menu-btn").length === 0) {
        $('.menu-nav').removeClass('menu-nav--open');
    }
});

$('.menu-btn').on('click', function(e){
	e.preventDefault();
	$(this).toggleClass('menu-btn--open');
	$('.menu-nav').toggleClass('menu-nav--open');
});

$('.menu-nav__link').on('click', function(e){
  $("#main-btn-img").attr('src', $(this).find('img').attr('src'));
});

body, html {
  margin: 0;
}

.section {
  width: 100%;
  height: 100vh;
  background: linear-gradient(#55efc4, #ffeaa7);
  position: relative;
}

.menu-btn__wrapper {
  position: absolute;
  top: 20px;
  right: 20px;
}

.menu-btn {
  width: 50px;
  height: 50px;
  display: block;
  background-color: #fff;
  border-radius: 50%;
  position: relative;
}

.menu-block {
  display: flex;
  flex-direction: column-reverse;
}

.menu-nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: .5s;
  transform-origin: top center;
  transform: scaleY(0) translateY(-20px);
  opacity: 0;
}
.menu-nav.with-border {
  background-color: #fff;
  padding-bottom: 20px;
  padding-top: 30px;
  margin-top: -40px;
  border-radius: 50px;
}
.menu-nav--open {
  transform: scaleY(1) translateY(0);
  opacity: 1;
}
.menu-nav__name {
  position: absolute;
  right: 45px;
  top: 0;
  margin: 0;
  opacity: 0;
  transition: .3s;
}
.menu-nav__name img {
  idth: 30px;
  height: 30px;
  border-radius: 50%;
}
.menu-nav__link {
  display: inline-block;
  color: #000;
  margin-top: 5px;
  transition: .4s;
  position: relative;
}

.menu-nav__img {
  width: 30px;
  height: 30px;
  display: flex;
  justify-content: center;
  margin-left: auto;
  margin-right: auto;
  padding-top: 20%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="section">
  <div class="menu-btn__wrapper">
    <div class="menu-block">
      <nav class="menu-nav with-border"><a class="menu-nav__link" href="#">
          <p class="menu-nav__name"></p></a><a class="menu-nav__link" href="#">
          <p class="menu-nav__name"></p><img class="menu-nav__img menu-img" src="https://cdn2.iconfinder.com/data/icons/world-flags-1-1/100/Britain-512.png"></a><a class="menu-nav__link" href="#">
          <p class="menu-nav__name"></p><img class="menu-nav__img menu-img" src="http://icons.veryicon.com/png/Flag/Rounded%20World%20Flags/Russia%20Flag.png"></a><a class="menu-nav__link" href="#">
          <p class="menu-nav__name"></p><img class="menu-nav__img menu-img" src="https://cdn.countryflags.com/thumbs/germany/flag-round-250.png"> </a></nav><a class="menu-btn" href="#"><img class="menu-nav__img" id="main-btn-img" src="https://cdn2.iconfinder.com/data/icons/world-flags-1-1/100/Britain-512.png"><span class="menu-btn__line"></span></a>
    </div>
  </div>
</div>