纯前端技术做实时预览的markdown编辑器_懂视

纯前端技术做实时预览的markdown编辑器

2020-11-27 20:01:25 责编:小采

这次给大家带来纯前端技术做实时预览的markdown编辑器，用纯前端技术做实时预览的markdown编辑器的注意事项有哪些，下面就是实战案例，一起来看一下。

第一步搭建布局:
1.构思布局（以下是总体布局）

2.项目下新建个index.html页面,写入以下代码:

<!DOCTYPE html><html>
 <head>
 <meta charset="UTF-8">
 <title>markdown编辑器</title>
 <style type="text/css">
 * { margin: 0; padding: 0; outline: none; border-radius: 0;
 } 
 html, body { width: 100%; height: 100%; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; background-color: #ebebeb;
 } #toolbar { height: 50px; background-color: #444; width: 100%; color: #fff; line-height: 50px;
 } #container { overflow: auto; position: absolute; bottom: 0; left: 0; right: 0; top: 50px;
 } #editor-column, #preview-column { width: 49.5%; height: 100%; overflow: auto; position: relative; background-color: #fff;
 } .pull-left { float: left;
 } 
 .pull-right { float: right;
 } </style>
 </head>
 <body>
 <div id="toolbar"></div>
 <div id="container">
 <div id="editor-column" class="pull-left">
 <div id="panel-editor">
 </div>
 </div>
 <div id="preview-column" class="pull-right">
 <div id="panel-preview">
 </div>
 </div>
 </div>
 </body></html>

效果预览

第二步引入资源实现初步效果:
1.项目下创建js文件夹
2.解从下载好的压缩包解marked/lib下的marked.js到js文件夹
3.解从下载好的压缩包解ace-builds/src到js文件夹重命名为ace
4.引入js文件
(注:markdown.css是markdown样式文件,可以自行编写或从网上下载比如:github-markdown-css)

<!DOCTYPE html><html> 
 <head>
 <meta charset='UTF-8'>
 <title>markdown编辑器</title>
 <script src="js/jquery-2.1.4.min.js"></script>
 <script src="js/marked.js"></script> 
 <script src="js/ace/ace.js"></script>
 <link href="markdown.css" rel="stylesheet" />
 <!--略-->

5初始化插件

(先添加编辑区和显示区代码)

<!--略-->#mdeditor,#preview,#panel-editor,#panel-preview{
 height: 100%;
 width: 100%;
 } </style>
 </head>
 <body>
 <div id='toolbar'></div>
 <div id='container'><div id='editor-column' class='pull-left'>
 <div id='panel-editor'>
 <!--编辑区-->
 <div class="editor-content" id="mdeditor" ></div>
 </div> 
 </div>
 <div id='preview-column' class='pull-right'>
 <div id='panel-preview'>
 <!--显示区-->
 <div id="preview" class="markdown-body"></div>
 </div>
 </div> 
 <!--略-->

(先添加初始化代码)

<!--略--><script>
 var acen_edit = ace.edit('mdeditor'); 
 acen_edit.setTheme('ace/theme/chrome');
 acen_edit.getSession().setMode('ace/mode/markdown');
 acen_edit.renderer.setShowPrintMargin(false);
 $("#mdeditor").keyup(function() {
 $("#preview").html(marked(acen_edit.getValue()));
 }); </script>
 </body></html>

效果预览

第三步添加工具到工具栏示例:

1.编写公用方法
(其实点击工具主要是在编辑器里自动插入本来手打的符号)

function insertText(val){
 acen_edit.insert(val);//光标位置插入
 }
<div id='toolbar'>
 <button onclick="insertText('**?**')">加粗</button>
 <button onclick="insertText('_?_')">斜体</button>
 <button onclick="insertText('>')">引用</button>
 ..... </div>

第四步 ace.js API 实现编辑器设置功能:

<div id='toolbar'>
 <button onclick="insertText('**?**')">加粗</button>
 <button onclick="insertText('_?_')">斜体</button>
 <button onclick="insertText('>')">引用</button>

设置:

<select id="theme" size="1">
 <optgroup label="Bright">
 <option value="ace/theme/chrome">Chrome</option>
 <option value="ace/theme/clouds">Clouds</option>
 <option value="ace/theme/crimson_editor">Crimson Editor</option>
 <option value="ace/theme/dawn">Dawn</option>
 <option value="ace/theme/dreamweaver">Dreamweaver</option>
 <option value="ace/theme/eclipse">Eclipse</option>
 <option value="ace/theme/github">GitHub</option>
 <option value="ace/theme/iplastic">IPlastic</option>
 <option value="ace/theme/solarized_light">Solarized Light</option>
 <option value="ace/theme/textmate">TextMate</option>
 <option value="ace/theme/tomorrow">Tomorrow</option>
 <option value="ace/theme/xcode">XCode</option>
 <option value="ace/theme/kuroir">Kuroir</option>
 <option value="ace/theme/katzenmilch">KatzenMilch</option>
 <option value="ace/theme/sqlserver">SQL Server</option>
 </optgroup>
 <optgroup label="Dark">
 <option value="ace/theme/ambiance">Ambiance</option>
 <option value="ace/theme/chaos">Chaos</option>
 <option value="ace/theme/clouds_midnight">Clouds Midnight</option>
 <option value="ace/theme/cobalt">Cobalt</option>
 <option value="ace/theme/gruvbox">Gruvbox</option>
 <option value="ace/theme/idle_fingers">idle Fingers</option>
 <option value="ace/theme/kr_theme">krTheme</option>
 <option value="ace/theme/merbivore">Merbivore</option>
 <option value="ace/theme/merbivore_soft">Merbivore Soft</option>
 <option value="ace/theme/mono_industrial">Mono Industrial</option>
 <option value="ace/theme/monokai">Monokai</option>
 <option value="ace/theme/pastel_on_dark">Pastel on dark</option>
 <option value="ace/theme/solarized_dark">Solarized Dark</option>
 <option value="ace/theme/terminal">Terminal</option>
 <option value="ace/theme/tomorrow_night">Tomorrow Night</option>
 <option value="ace/theme/tomorrow_night_blue">Tomorrow Night Blue</option>
 <option value="ace/theme/tomorrow_night_bright">Tomorrow Night Bright</option>
 <option value="ace/theme/tomorrow_night_eighties">Tomorrow Night 80s</option>
 <option value="ace/theme/twilight">Twilight</option>
 <option value="ace/theme/vibrant_ink">Vibrant Ink</option>
 </optgroup>
 </select>
 字体大小 <select id="fontsize" size="1">
 <option value="10px">10px</option>
 <option value="11px">11px</option>
 <option value="12px" selected="selected">12px</option>
 <option value="13px">13px</option>
 <option value="14px">14px</option>
 <option value="16px">16px</option>
 <option value="18px">18px</option>
 <option value="20px">20px</option>
 <option value="24px">24px</option>
 </select> 
 代码折行 <select id="folding" size="1">
 <option value="manual">manual</option>
 <option value="markbegin" selected="selected">mark begin</option>
 <option value="markbeginend">mark begin and end</option>
 </select>
 自动换行 <select id="soft_wrap" size="1">
 <option value="off">Off</option>
 <option value="40">40 Chars</option>
 <option value="80">80 Chars</option>
 <option value="free">Free</option>
 </select>
 全选样式<input type="checkbox" name="select_style" id="select_style" checked=""> 
 光标行高光<input type="checkbox" name="highlight_active" id="highlight_active" checked="">
 显示行号<input type="checkbox" id="show_gutter" checked=""> 
 打印边距<input type="checkbox" id="show_print_margin" checked="">
 </div><!---略--->......
 $("#theme").change(function() {
 acen_edit.setTheme($(this).val());
 })
 $("#fontsize").change(function() {
 acen_edit.setFontSize($(this).val());
 }) 
 $("#folding").change(function() {
 session.setFoldStyle($(this).val());
 })
 $("#select_style").change(function() {
 acen_edit.setOption("selectionStyle", this.checked ? "line" : "text");
 })
 $("#highlight_active").change(function() {
 acen_edit.setHighlightActiveLine(this.checked);
 })
 $("#soft_wrap").change(function() {
 acen_edit.setOption("wrap", $(this).val());
 })
 $("#show_print_margin").change(function() {
 acen_edit.renderer.setShowPrintMargin(this.checked);

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