markdown 中启用音频支持

markdown 默认不支持音频文件，我们通过 html 标签渲染

flask项目

其中音频文件放在 /static/audios/vad_example.wav

markdown 内容如下：

## 音频播放器示例
<audio controls  ><source src="vad_example.wav" type="audio/wav">
</audio>

预览显示为html

<p>&lt;audio controls &gt;<br> &lt;source src="vad_example.wav" type="audio/wav"&gt;<br>&lt;/audio&gt;</p>

我们需要把上面代码变为如下html：

<audio controls  ><source src="{{ url_for('static', filename='audios/vad_example.wav') }}" type="audio/wav">
</audio>

1编辑器预览区替换

markdown编辑器的html 代码：

        <div id="create-editormd" class="editor"><textarea name="doc" id="doc">{{ request.form['doc'] or post['body'] if post else '' }}</textarea></div>

js脚本：
预览区域默认html标签 editormd-preview
通过 onload 预览触发替换

<script type="text/javascript">var testEditor;var textarea = document.getElementById('doc');$(function () {testEditor = editormd("create-editormd",{width: "90%",height: 640,syncScrolling: "single",path: "{{ url_for('static',filename='editormd/lib/') }}",imageUpload: true,imageFormats: ["jpg", "jpeg", "gif", "png", "bmp", "webp"],imageUploadURL: "/upload/upload_image",  // 设置图片上传的服务器路径onload: function () {console.log("onload");// 动态替换音频文件路径const audioPathPrefix = "{{ url_for('static', filename='audios/') }}";const previewContainer = document.querySelector('.editormd-preview');if (previewContainer) {console.log("Found preview container:", previewContainer);// 查找并替换 <p> 标签内的音频标签const pElements = previewContainer.querySelectorAll('p');pElements.forEach(pElement => {const htmlContent = pElement.innerHTML;// 使用正则表达式匹配 <p> 标签内的音频标签const audioRegex = /&lt;audio\s+controls[^&gt;]*&gt;[\s\S]*&lt;source\s+src="([^"]+)"\s+type="audio\/wav"[^&gt;]*&gt;[\s\S]*&lt;\/audio&gt;/g;const matches = htmlContent.match(audioRegex);if (matches) {matches.forEach(match => {// 替换 &lt; 和 &gt; 为 < 和 >let actualHtml = match.replace(/&lt;/g, '<').replace(/&gt;/g, '>');// 移除 <br> 标签actualHtml = actualHtml.replace(/<br>/g, '');// 替换 <p> 标签内的内容pElement.innerHTML = pElement.innerHTML.replace(match, actualHtml);console.log("Replaced audio tag:", actualHtml);});}else{console.log("No audio tags found in p element.");}});// 更新音频文件路径const audioElements = previewContainer.querySelectorAll('audio source');if (audioElements.length > 0) {console.log("Found audio elements:", audioElements);audioElements.forEach(element => {const originalSrc = element.getAttribute('src');const newSrc = audioPathPrefix + originalSrc;element.setAttribute('src', newSrc);console.log("Updated src from", originalSrc, "to", newSrc);});} else {console.log("No audio elements found.");}} else {console.log("No preview container found.");}}});});</script>

显示页面：
在这里插入图片描述

2 显示页面替换

html:

    <!-- 预览区域 --><div id="preview-wrapper" class="markdown-body"><!-- 这里会显示Markdown的渲染内容 --></div>

js 脚本:

<script type="text/javascript">document.addEventListener("DOMContentLoaded", function () {const preview = document.getElementById("preview-wrapper")// 更新预览preview.innerHTML = '';editormd.markdownToHTML(preview.id, {markdown: docBody,htmlDecode: "style,script,iframe",emoji: true,taskList: true,tex: true,flowChart: true,sequenceDiagram: true,});// 动态替换音频文件路径// 假设 audio_path 是从 Flask 传递过来的变量const audioPathPrefix = "{{ url_for('static', filename='audios/') }}";const audioElements = preview.querySelectorAll('audio source');audioElements.forEach(element => {const originalSrc = element.getAttribute('src');const newSrc = audioPathPrefix + originalSrc;element.setAttribute('src', newSrc);});});</script>