在下面的html元素中,当动态显示的那些html内容click事件尚不起作用时,它们将静态呈现。



var toggler = document.getElementsByClassName("caret");
var i;

for (i = 0; i < toggler.length; i++) {
  toggler[i].addEventListener("click", function() {
    this.parentElement.querySelector(".nested").classList.toggle("active");
    this.classList.toggle("caret-down");
  });
}

/* Remove default bullets */
ul, .myUL {
  list-style-type: none;
}

/* Remove margins and padding from the parent ul */
.myUL {
  margin: 0;
  padding: 0;
}

/* Style the caret/arrow */
.caret {
  cursor: pointer;
  user-select: none; /* Prevent text selection */
}

/* Create the caret/arrow with a unicode, and style it */
.caret::before {
  content: "\25B6";
  color: black;
  display: inline-block;
  margin-right: 6px;
}

/* Rotate the caret/arrow icon when clicked on (using JavaScript) */
.caret-down::before {
  transform: rotate(90deg);
}
<pre><code>
/* Hide the nested list */
.nested {
  display: none;
}

/* Show the nested list when the user clicks on the caret/arrow (with JavaScript) */
.active {
  display: block;
} 

<ul id="myUL">
  <li><span class="caret">Beverages</span>
    <ul class="nested">
      <li>Water</li>
      <li>Coffee</li>
      <li><span class="caret">Tea</span>
        <ul class="nested">
          <li>Black Tea</li>
          <li>White Tea</li>
          <li><span class="caret">Green Tea</span>
            <ul class="nested">
              <li>Sencha</li>
              <li>Gyokuro</li>
              <li>Matcha</li>
              <li>Pi Lo Chun</li>
            </ul>
          </li>
        </ul>
      </li>
    </ul>
  </li>
</ul>

最佳答案

您的事件监听器的问题在于它将无法在动态创建的内容上运行。它绑定到仅在首次添加事件侦听器时存在的元素。

您可以从文档中捕获事件,然后在事件与元素选择器匹配时对其进行处理:

document.addEventListener('click', function(e) {
    if(e.target && e.target.classList.contains('caret')) {
        e.target.parentElement.querySelector(".nested").classList.toggle("active");
        e.target.classList.toggle("caret-down");
    }
});

关于javascript - 使用列表项的树状 View ,但是click事件不适用于动态创建的HTML内容,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/59370392/

10-12 12:39
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