Milla Well Milla Well - 13 days ago 6
jQuery Question

let PageDown and MathJax work together

I am implementing a UI which is supposed to look pretty much like the one on math.stackexchange.com:


  1. Using fancy Markdown like you are used to on stackoverflow

  2. Parsing formulars using MathJax between
    $
    ...
    $
    -signs.



So I downloaded the PageDown demo and set it up, which works pretty well. Now I try to let MathJax being loaded dynamically everytime the
<textarea>
changes.

MathJax got an example for this approach but I'm not able to get it running. This is what 'my' code looks like:

<link rel="stylesheet" type="text/css" href="demo.css" />

<script type="text/javascript" src="../../Markdown.Converter.js"></script>
<script type="text/javascript" src="../../Markdown.Sanitizer.js"></script>
<script type="text/javascript" src="../../Markdown.Editor.js"></script>

<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.2.js"></script>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
tex2jax: {
inlineMath: [["$","$"],["\\(","\\)"]]
}
});
$("#wmd-input").keypress(function(event){
UpdateMath($(this).val());
});
</script>
<script type="text/javascript" src="../../../mathjax-MathJax-07669ac/MathJax.js?config=TeX-AMS_HTML-full">
</script>
</head>
<body>
<script>
(function () {
var QUEUE = MathJax.Hub.queue; // shorthand for the queue
var math = null; // the element jax for the math output.

QUEUE.Push(function () {
math = MathJax.Hub.getAllJax("#wmd-preview")[0];
});

window.UpdateMath = function (TeX) {
QUEUE.Push(["Text",math,"\\displaystyle{"+TeX+"}"]);
}
})();
</script>

<div class="wmd-panel">
<div id="wmd-button-bar"></div>
<textarea class="wmd-input" id="wmd-input" value=""/>

</textarea>
</div>
<div id="wmd-preview" class="wmd-panel wmd-preview"></div>
<br /> <br />
<script type="text/javascript">(function () {
var converter1 = Markdown.getSanitizingConverter();
var editor1 = new Markdown.Editor(converter1);
editor1.run();
})();
</script>
</body>


This snippet should update the preview everytime the
keypress
event is fired. Instead on page onload the tex is rendered fine but as soon as I start typing the
$
...
$
code is printed in the preview box.

Answer

I've created a basic example for how to get Pagedown and MathJax working together using a slight modification of Stack Exchange's mathjax-editing.js.

Stack Exchange's code is based on Davide Cervone's, see his comment on another answer.

The code for the example can be viewed on github.

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