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Use HTML+CSS to create a real-time preview markdown editor

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Mar 08, 2018 am 09:27 AM

html+cssmarkdown

This time I will bring you a markdown editor with real-time preview using HTML+CSS. What are the precautions for using HTML+CSS to make a markdown editor with real-time preview? Here is a practical case, let’s take a look.

The first step to build the layout:

1. Conceive the layout (the following is the overall layout)

Use HTML+CSS to create a real-time preview markdown editor

2. Create a new index.html page under the project and write the following code:

<!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>

The second step is to introduce resources to achieve the initial effect:

1. Create a js folder under the project

2. Extract marked.js under marked/lib from the downloaded compressed package to the js folder

3. Extract ace-builds/src from the downloaded compressed package to the js file Rename the folder to ace

4. Introduce the js file

(Note: markdown.css is a markdown style file, you can write it yourself or download it from the Internet, such as: github-markdown-css)

<!DOCTYPE html><html> 
<head>
<meta charset=&#39;UTF-8&#39;>
<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-->

5Initialization plug-in

(Add the editing area and display area code first)

<!--略-->#mdeditor#preview,#panel-editor,#panel-preview{
height: 100%;
width: 100%;
}</style>
</head>
<body>
<div id=&#39;toolbar&#39;></div>
<div id=&#39;container&#39;><div id=&#39;editor-column&#39; class=&#39;pull-left&#39;>
<div id=&#39;panel-editor&#39;>
                                        <!--编辑区-->
<div class="editor-content" id="mdeditor" ></div>
</div> 
</div>
<div id=&#39;preview-column&#39; class=&#39;pull-right&#39;>
<div id=&#39;panel-preview&#39;>
                                       <!--显示区-->
<div id="preview" class="markdown-body"></div>
</div>
</div> 
 <!--略-->

(Add the initialization code first)

<!--略--> 
var acen_edit = ace.edit(&#39;mdeditor&#39;); 
acen_edit.setTheme(&#39;ace/theme/chrome&#39;);
acen_edit.getSession().setMode(&#39;ace/mode/markdown&#39;);
acen_edit.renderer.setShowPrintMargin(false);
$("#mdeditor").keyup(function() {
$("#preview").html(marked(acen_edit.getValue()));
});

The third step is to add tools to the toolbar. Example:

1. Write public methods

(In fact, clicking on the tool mainly automatically inserts the original hand-typed symbols in the editor)

function insertText(val){
acen_edit.insert(val);//光标位置插入
}
<div id=&#39;toolbar&#39;>
<button onclick="insertText(&#39;**?**&#39;)">加粗</button>
<button onclick="insertText(&#39;_?_&#39;)">斜体</button>
<button onclick="insertText(&#39;>&#39;)">引用</button>
.....</div>

The fourth step ace.js API implements the editor setting function:

<div id=&#39;toolbar&#39;>
   <button onclick="insertText(&#39;**?**&#39;)">加粗</button>
   <button onclick="insertText(&#39;_?_&#39;)">斜体</button>
   <button onclick="insertText(&#39;>&#39;)">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);
})

Use HTML+CSS to create a real-time preview markdown editor

I believe you have mastered the method after reading the case in this article. Please pay attention to php for more exciting information Other related articles on the Chinese website!

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