There should be a hook for preview mode somewhere. Several other scripts use it as well.

That would be:
$j( mw ).bind( 'LivePreviewPrepare' , function(){ // start loading });

but only works for livepreview it seems...

Created attachment 10339
Proposed code for ext.math.mathjax.enabler.js

The proposed code (easier to read than a diff) does the following:

• apply coding conventions
• remove global variable mathJax (not to be mixed up with MathJax), moved this to mediaWiki.mathJax
• remove special code for WikEd and AjaxPreview, this did only work when ext.math.mathjax.enabler.js was loaded in edit mode, which only happened when showing a preview with math.
• introduce a jQuery method to render all TeX inside a jQuery collection, it hooks into the MathJax system, so will work no matter when you call it.

It can be used as $content.renderTeX( function () { alert('Done!'); } );
I don't think that the Math extension should implement it's own hook system, but wait for bug 23580. Gadgets can use code like

mw.loader.using( 'ext.math.mathjax.enabler', function () {
$newContent.renderTeX();
} );

to load the code (if this didn't already happen) and render the formulas in the new content.

Attached:

https://gerrit.wikimedia.org/r/23073

Related URL: https://gerrit.wikimedia.org/r/61182 (Gerrit Change I97800317366aafcaad87ecf6644e9417c698c5da)

https://gerrit.wikimedia.org/r/23073 (Gerrit Change Ic05659eaca35a939289bf49b17084299319d8c4d) | change ABANDONED [by TheDJ]

Related URL: https://gerrit.wikimedia.org/r/61183 (Gerrit Change I18e2f089d56e42b8e603ac45d726942bb478580b)

Related URL: https://gerrit.wikimedia.org/r/61184 (Gerrit Change I9811832430e9ddd8a4c03f265d07529a76efc38a)