单击另一个元素后，使用vanilla javascript将类添加/删除到其他元素 [英] Use vanilla javascript to add / remove class to a different element after clicking on another one

问题描述

我查看了许多类似的问题，但找不到一个在vanilla JS中回答的具体示例如何将类添加到一个不同的元素中并从中删除。我知道它与设置循环和遍历元素有关，但我在确切的过程中迷路了。

I have looked through a number of similar questions but can not find a specific example of one that answers in vanilla JS how to add and remove a class to a different element from the one clicked on. I know it has something to do with setting up a loop and iterating through the elements, but I got lost in the exact process.

我有一些类名为 faq-container 的元素，当我点击它们中的任何一个时，我希望将类 faq-display 添加到body标签中。我知道我必须设置一个类似的循环（var i = 0; i< elements.length; i ++）{elements [i] .classList.remove（'hover'）;
} 但我不确定在代码中将其写入的确切位置以使其工作。我尝试了很多方法，但都失败了。

I have a number of elements with a class name of faq-container and when I click on any of them, I would like the class faq-display added to the body tag. I know I have to set up a loop like for (var i = 0; i < elements.length; i++) { elements[i].classList.remove('hover'); } but I am unsure as to exactly where to write it in the code to make this work. I have tried a number of ways but all fail.

我当前的脚本如下，我只是定位数组中的第一个元素，但我希望能够点击任何 faq-container 元素并将类名添加到第一个也是唯一的body标记：

My current script is as follows, where I simply target the first element in the array, but I want to be able to click on any of the faq-container elements and add the class name to the first and only body tag:

document.addEventListener("DOMContentLoaded", function() {

  document.getElementsByClassName('faq-container')[0].addEventListener('click', function() {
    var faqToggle = document.getElementsByTagName('body')[0];
    if (faqToggle.classList.contains('faq-display')) {
      faqToggle.classList.remove('faq-display');
      // alert("remove faq display!");
    } else {
      faqToggle.classList.add('faq-display');
      // alert("add faq display!");
    }
  });


});

<div class="faq-container cf" id="faq-container">
  <h3 <?=ifxless::element( 'name')?>><?=ifxless::fill($this,'name');?> </h3>

  <div class="faq-content">
    <div class="h_line">&nbsp;</div>

    <div class="faq-bullets" <?=ifxless::element( 'content')?>>
      <?=ifxless::fill($this, 'content');?>
    </div>

  </div>

</div>

推荐答案

document.addEventListener("DOMContentLoaded", function() {
  var faqContainers = document.getElementsByClassName('faq-container');
  var faqToggle = document.getElementsByTagName('body')[0];
  for (var i = 0; i < faqContainers.length; i++) {

    faqContainers[i].addEventListener('click', function() {

      if (faqToggle.classList.contains('faq-display')) {
        faqToggle.classList.remove('faq-display');
        // alert("remove faq display!");
      } else {
        faqToggle.classList.add('faq-display');
        // alert("add faq display!");
      }

    });
  }


});

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