MutationObserver - getting "TypeError: MutationObserver.observe: Argument 1 does not implement interface Node."

Question

我正在尝试检测由图像滑块插件动态设置的元素的高度，并使用它来设置容器的高度。

获取“类型错误：MutationObserver.observe：参数 1 未实现接口节点。”

我检查了MutationObserver documentation and its options。看到了

At a minimum, one of childList, attributes, and/or characterData must be true when you call observe(). Otherwise, a TypeError exception will be thrown.

并且我将属性设置为 true 但仍然收到 typeError

jQuery(document).ready(function($){
  // Callback function to execute when mutations are observed
  const callback = function(mutationsList, observer) {
      for(const mutation of mutationsList) {
          console.log('The ' + mutation.attributeName + ' attribute was modified.');
      }
  };

  const observer = new MutationObserver(callback);

  //set up your configuration
  const config = { attributes:true, subtree: false };

  var changingContainer = $('.soliloquy-viewport');

  //start observing
  observer.observe(changingContainer, config);
  
  //change height on button press
  function changeHeight(){
    changingContainer.height(Math.floor((Math.random() * 100) + 20));
  }
  $("#height").click(changeHeight);
});

.soliloquy-viewport{
  background: yellow;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

<div class="soliloquy-viewport">
  Hello
</div>
<button id="height">
change height
</button>

Answer 1

MutationObervers 仅适用于 Element 对象，不适用于 jQuery 对象。使用 get() 将 observe() 的第一个参数更改为基础元素，如下所示：

observer.observe(changingContainer.get(0), config);

或者像这样按索引访问 jQuery 对象：

observer.observe(changingContainer[0], config);

jQuery(document).ready(function($) {
  let $changingContainer = $('.soliloquy-viewport');
  
  const observer = new MutationObserver((ml, o) => {
    for (const m of ml) {
      console.log('The ' + m.attributeName + ' attribute was modified.');
    }
  });
  
  observer.observe($changingContainer.get(0), {
    attributes: true,
    subtree: false
  });

  //change height on button press
  $("#height").click(() => $changingContainer.height(Math.floor((Math.random() * 100) + 20)));
});

.soliloquy-viewport {
  background: yellow;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>

<div class="soliloquy-viewport">Hello</div>
<button id="height">change height</button>

请注意，这仅适用于单个元素。对于具有相同 class 的多个元素，您将需要遍历它们并单独应用 MO。

MutationObserver - getting "TypeError: MutationObserver.observe: Argument 1 does not implement interface Node."

MutationObserver - getting "TypeError: MutationObserver.observe: Argument 1 does not implement interface Node."

javascript

jquery

mutation-observers