Trix 编辑器定义自定义附件样式

Question

我向 Trix 编辑器添加了一个图像，生成了以下代码：

<figure 
    data-trix-attachment="{lots of data}" 
    data-trix-content-type="image/jpeg"
    data-trix-attributes="{'presentation':'gallery'}" 
    class="attachment attachment--preview attachment--jpg">
    <img src="http://myhost/myimage.jpg" width="5731" height="3821">
    <figcaption class="attachment__caption">
        <span class="attachment__name">cool.jpg</span> <span class="attachment__size">4.1 MB</span>
    </figcaption>
</figure>

当我在基于 Bootstrap 的页面上显示从编辑器生成的 HTML 时，图像显然扩展了屏幕（参见width和height），我想删除这些道具并将img-fluid类分配给它。

所以基本上我想使用配置：

Trix.config.css.attachment = 'img-fluid'

但这确实 a) 不会将attachment类更改为img-fluid，也不会将更改应用于图像，而是将figure.

我想避免每次显示内容时都使用 jQuery 并遍历所有内容figures，然后在运行时操作图像的属性。

添加附件时没有定义这些样式的解决方案吗？

Answer 1

Trix不支持更改附件内的图像元素。一种方法是使用MutationObserver检查 Trix 编辑器中适用于attributes、childList和 的突变subtree。

如果我们对具有父节点的目标节点有一个widthorheight attributes突变，那么我们删除这些属性，我们可以将该类应用于第一个属性突变，例如。imgfigureimg-fluidwidth

运行代码片段并尝试添加一些图像附件以查看或检查 HTML

^{请阅读内嵌评论}

// Listen to trix-attachment-add event so we'll get rid of the progress bar just for this demo
// Here we should upload the attachment and handle progress properly
document.addEventListener("trix-attachment-add", event => {
  const { attachment } = event.attachment;
 
  // Get rid of the progress bar
  attachment.setUploadProgress(100)
});


// Get the Trix editor
const editor = document.querySelector('trix-editor');

// Instantiating an observer
const observer = new MutationObserver(function (mutations) {
  mutations.forEach(({ type, target, attributeName }) => {
    
    // If the parent is a figure with an img target
    if (target.parentNode.tagName === 'FIGURE' && 
        target.nodeName === 'IMG')
    {
      if (type === 'attributes') {
        switch(attributeName) {

          // If we have attribute width
          case 'width':
            // Remove attribute width
            target.removeAttribute('width');
            // Add img-fluid only once
            target.classList.add('img-fluid');
            break;

          // If we have attribute height
          case 'height':
            // Remove attribute height
            target.removeAttribute('height');
            break;
        }
      }

      // Render images HTML code
      renderHtmlOutput();
    }

  });
});

// Observing Trix Editor
observer.observe(editor, {
  attributes: true,
  childList: true,
  subtree: true
});

// Function to render every figure > img HTML code
function renderHtmlOutput() {
  const images = editor.querySelectorAll('figure > img');
  let output = '';

  for(const image of images) {
    output += image.outerHTML.replace(/ /g, "\n  ") + "\n";
  }

  document.getElementById('output-html').textContent = output;
}

body {
  height: 100vh;
  margin: 0;
  flex-direction: column;
  display: flex;
}
#main {
  display: flex;
  flex-direction: row;
  flex: 1;
  margin: 10px;
}

#editor-container {
  flex: 3;
}

#output-container {
  flex: 2;
  margin-left: 20px;
  border-left: 1px solid lightgray;
  overflow: auto;
}

#output-html {
  margin: 0;
  padding: 10px;
  font-size: small;
  color: blue;
}

/* Hide some Trix buttons to free horizontal space */
.trix-button--icon-increase-nesting-level,
.trix-button--icon-decrease-nesting-level,
.trix-button--icon-bullet-list,
.trix-button--icon-number-list { display: none; }

<script src="https://cdnjs.cloudflare.com/ajax/libs/trix/1.2.1/trix.js" integrity="sha256-2D+ZJyeHHlEMmtuQTVtXt1gl0zRLKr51OCxyFfmFIBM=" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/trix/1.2.1/trix.css" integrity="sha256-yebzx8LjuetQ3l4hhQ5eNaOxVLgqaY1y8JcrXuJrAOg=" crossorigin="anonymous"/>

<section id="main">
  <div id="editor-container">
    <form>
      <input id="editor" value="Editor content goes here" type="hidden" name="content">
      <trix-editor input="editor"></trix-editor>
    </form>
  </div>
  <div id="output-container">
    <pre id="output-html"></pre>
  </div>
</section>