Disable/Enable MathJax

Basj

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Nov 23, 2016, 10:15:55 AM11/23/16

to MathJax Users

Hello,
I would like to disable / enable Mathjax with a button, with Javascript.

Live demo here

After disabling, the DOM should look like this http://gget.it/hc9zrt05/testtt.html, like if MathJax wasn't here, the $, $$ will be displayed normally like text.

<body>
<p>
When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
</p>
</body>

After reenabling, the output should be rendered as math again.

How to do this?

Thanks in advance if you have an idea.

PS : What I've I tried:

* change renderer to PlainSource, but it's not what I'm looking for...

*

MathJax.Hub.queue.pending = 0;
but it doesn't change anything even if I use method Rerender.

Peter Krautzberger

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Nov 23, 2016, 11:20:00 AM11/23/16

to mathja...@googlegroups.com

Hi,

You might want to search the group for similar threads such as https://groups.google.com/forum/#!topic/mathjax-users/QVGbaUCP6fY/discussion.

Regards,

Peter.

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Davide Cervone

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Dec 2, 2016, 8:35:00 AM12/2/16

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Here is a sample that should do something like what you are after.

<!DOCTYPE html>
<html>
<head>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
tex2jax: {inlineMath: [['$','$'],['\$','\$']]}
});
MathJax.Hub.Queue(function () {
document.getElementById("toggle").disabled = false;
});
</script>
<script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_CHTML"></script>
<script>
var isTypeset = true;
function ToggleMJ(button) {
button.disabled = true;
button.value = (isTypeset ? "Typeset Math" : "Remove Typeset Math");
MathJax.Hub.Queue(
(isTypeset ? RemoveMJ : ["Typeset",MathJax.Hub]),
function () {
isTypeset = !isTypeset;
button.disabled = false;
}
);
}
function RemoveMJ() {
var jax = MathJax.Hub.getAllJax();
for (var i = 0, m = jax.length; i < m; i++) {
var tex = jax[i].originalText;
var isDisplay = (jax[i].root.Get("display") === "block");
if (isDisplay) tex = "$$"+tex+"$$"; else tex = "$"+tex+"$";
var script = jax[i].SourceElement();
jax[i].Remove();
var preview = script.previousSibling;
if (preview && preview.className === "MathJax_Preview")
preview.parentNode.removeChild(preview);
script.parentNode.insertBefore(document.createTextNode(tex),script);
script.parentNode.removeChild(script);
}
}
</script>
</head>

<body>

<p>
When $a \ne 0$, there are two solutions to $ax^2 + bx + c = 0$ and they are
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
</p>

<p>
<input id="toggle" type="button" value="Remove Typeset Math" onclick="ToggleMJ(this)" disabled />

</body>
</html>

This will remove the typeset math and the related MathJax elements when the button is pressed. Pressing a second time causes MathJax to typeset again.

Note, however, that MathJax inserts other elements in the page than just the typeset math. These include stylesheets and other elements like the message area (at the lower left of the window). These are note removed by this code, and if you want to be able to re-typeset the math, you can not remove them.

Also note that the original math delimiters are not retained by MathJax, so this code always uses $...$ for inline math, even if the original used $...$.

Davide

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