使用 MathJax 的数学方程式的所见即所得编辑器

Question

我正在尝试构建 WYSIWYG 编辑器以使用 MathJax 编写数学公式。我正在尝试 select 文本区域中的随机内容并将其粘贴到 div 中以将其转换为数学方程式。

<!DOCTYPE html>
<html>
<head>
    <title>Wrap Selected Content with Dummy Editor</title>
    <script type="text/javascript" src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>;
    <script type="text/x-mathjax-config">
        MathJax.Hub.Config({tex2jax: { inlineMath: [ ['$','$'], ['\(','\)'] ] } });
        MathJax.Hub.Config({tex2jax: { displayMath: [ ['$$','$$'], ['\(','\)'] ] } });
    </script>
</head>
<body>
<!--Select some random text from this textarea and click button -->
<textarea id="wrapSelectedContent"></textarea>
<!-- Content should be load here using JavaScript and Convert it into Mathematical Function -->
<div id="pasteSelectedContent" style="width:300px; height:300px; border:2px solid #000;"></div>
<!-- Static Content displayed Successfully -->
<p>$$\sum(a+b)(c+d)$$</p>
<button onclick="wrapContent();">Put Summation Sign</button>
<script type="text/javascript">
    function wrapContent(){
        var selectedContent = document.getElementById("wrapSelectedContent");
        var pasteselectedContent = document.getElementById("pasteSelectedContent");
        var textlength = selectedContent.textLength;
        var start = selectedContent.selectionStart;
        var end = selectedContent.selectionEnd;
        selectedContent.focus();
        selectedContent.setSelectionRange(start,end); 
        var selectedContentValue = selectedContent.value.substring(start, end);
        var replace = "$$\sum" + selectedContentValue + "$$";
        pasteselectedContent.textContent = selectedContent.value.substring(0,start) + " " + replace + " " + selectedContent.value.substring(end,textlength);        
        console.log("Start Index : " + start);
        console.log("End Index : " + end);
        console.log("Text Content Length : " + textlength);
        console.log(selectedContentValue);
    }
</script>
</body>
</html>

那么我如何使用数学方程式转换 div#pasteSelectedContent 中显示的文本请帮助我构建这个 WYSIWYG 编辑器

Answer 1

问题已解决

只需插入

    MathJax.Hub.Queue(["Typeset", MathJax.Hub, "pasteselectedContent"]);

第 32 行之后

pasteselectedContent.textContent = selectedContent.value.substring(0,start) + " " + replace + " " + selectedContent.value.substring(end,textlength);

使用 MathJax 的数学方程式的所见即所得编辑器

WYSIWYG Editor for Mathematical Equations using MathJax

javascript

math

jquery

mathjax