如何在元素外添加点击事件？ [复制]

Question

我当前的代码通过单击添加一个类来打开一个输入。当用户单击输入时，我无法添加第二次单击以删除添加的类。我添加了第二次点击事件，但它只是阻止了我的第一次点击事件的工作。

有没有其他方法可以使用纯 JavaScript 来解决这个问题？

（注释掉失败的尝试。）

let searchElement = document.querySelector('#searchElement');
let offCanvas = document.querySelector('#main');

searchElement.addEventListener('click', () => {
  searchElement.classList.add('extendInputSearch');
});


// offCanvas.addEventListener('click', () => {
  // searchElement.classList.remove('extendInputSearch');
// });

* {
  padding: 0;
  margin: 0;
}

html,
body {
  height: 100%;
  width: 100%;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  background-color: #e1e2f1;
}

form {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

input {
  width: 100%;
  height: 32px;
  border: none;
  outline: none;
  font-size: 1rem;
}

.inputSearch {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 15px;
  padding: 8px 20px;
  background-color: #ffffff;
  border: 1px solid transparent;
  border-radius: 6px;
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.inputSearch:hover {
  border: 1px solid #7e51fa;
}

.inputSearch i {
  color: #7e51fa;
  margin-right: 20px;
}

.extendInputSearch {
  max-width: 400px;
}

<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/>

<main id="main">
    <form>
      <div id="searchElement" class="inputSearch">
        <i class="fas fa-search"></i>
        <input type="text" placeholder="Search">
      </div>
    </form>
  </main>

Answer 1

您尝试的问题是删除类的事件侦听器应用于整个#main 元素，其中包括 searchElement。这意味着两个事件侦听器都应用于 searchElement，当您单击 searchElement 时，首先添加（使用第一个侦听器）该类，然后删除（使用第二个侦听器）。

要使其工作，您需要更改第二个侦听器以专门排除 searchElement。例如，在这段代码中，我们为整个文档添加了一个点击监听器。在监听器中，我们通过对事件参数使用Node.contains() 函数来检查点击是否在searchElement 之外。如果点击的元素不是 searchElement 的子元素（即点击在 searchElement 之外），我们从 searchElement 中移除 extendInputSearch 类。

let searchElement = document.querySelector('#searchElement');

searchElement.addEventListener('click', () => {
  searchElement.classList.add('extendInputSearch');
});


document.addEventListener('click', (e) => {
  if(!searchElement.contains(e.target)){
    searchElement.classList.remove('extendInputSearch');
  }
});

* {
  padding: 0;
  margin: 0;
}

html,
body {
  height: 100%;
  width: 100%;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  background-color: #e1e2f1;
}

form {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

input {
  width: 100%;
  height: 32px;
  border: none;
  outline: none;
  font-size: 1rem;
}

.inputSearch {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 15px;
  padding: 8px 20px;
  background-color: #ffffff;
  border: 1px solid transparent;
  border-radius: 6px;
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.inputSearch:hover {
  border: 1px solid #7e51fa;
}

.inputSearch i {
  color: #7e51fa;
  margin-right: 20px;
}

.extendInputSearch {
  max-width: 400px;
}

<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/>

<main id="main">
    <form>
      <div id="searchElement" class="inputSearch">
        <i class="fas fa-search"></i>
        <input type="text" placeholder="Search">
      </div>
    </form>
  </main>

Answer 2

试试看：

let searchElement = document.querySelector('#searchElement');
let offCanvas = document.querySelector('#main');

searchElement.addEventListener('click', () => {
  searchElement.classList.add('extendInputSearch');
});


  document.addEventListener('click', (e) => {
  const searchElement = document.querySelector('#searchElement');
 
  if (e.target != searchElement && e.target != searchElement.querySelector('i') && e.target != searchElement.querySelector('input')) {
    searchElement.classList.remove('extendInputSearch');
  }

});

* {
  padding: 0;
  margin: 0;
}

html,
body {
  height: 100%;
  width: 100%;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  background-color: #e1e2f1;
}

form {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

input {
  width: 100%;
  height: 32px;
  border: none;
  outline: none;
  font-size: 1rem;
}

.inputSearch {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 15px;
  padding: 8px 20px;
  background-color: #ffffff;
  border: 1px solid transparent;
  border-radius: 6px;
  transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.inputSearch:hover {
  border: 1px solid #7e51fa;
}

.inputSearch i {
  color: #7e51fa;
  margin-right: 20px;
}

.extendInputSearch {
  max-width: 400px;
}

<link rel="stylesheet" href="https://pro.fontawesome.com/releases/v5.10.0/css/all.css" integrity="sha384-AYmEC3Yw5cVb3ZcuHtOA93w35dYTsvhLPVnYs9eStHfGJvOvKxVfELGroGkvsg+p" crossorigin="anonymous"/>

<main id="main">
    <form>
      <div id="searchElement" class="inputSearch">
        <i class="fas fa-search"></i>
        <input type="text" placeholder="Search">
      </div>
    </form>
  </main>