MathJax testing for TeX and rendering errors. Create HTML page (with math) to include the MathJax library and then include this file. When the page is loaded, the js console will show when errors are encountered and the data about the error will be POSTed via ajax to a rest-type service named here as 'service/mathmltest'. That service should acc…

mathjax_test.js

function ajaxRequest(){
    return new XMLHttpRequest(async=false);
}
function mltest (){
    var filename = window.location.href.substr(window.location.href.lastIndexOf("/")+1);
    MathJax.Hub.Config({TeX: {noUndefined: {disabled: true}}});
    MathJax.Hub.Queue(function() {console.log('finished rendering');});
    MathJax.Hub.Register.MessageHook("TeX Jax - parse error",function (message) {
        console.log('error encountered');
        var mydata = {};
        var myrequest = new ajaxRequest();
        mydata['message'] = message[1];
        mydata['source'] = message[2];
        mydata['mode'] = message[3] ? "display mode" : "inline";
        mydata['filename'] = filename;

        myrequest.open('POST', 'service/mathmltest');
        myrequest.setRequestHeader("Content-type", "application/text");
        myrequest.send(JSON.stringify(mydata));

        });
    };
mltest();

This code was first written and posted on the MathJax google group by Davide P. Cervone. I added a few things and created this gist. See https://groups.google.com/forum/#!topic/mathjax-users/cx9qx5Yhae8 for details.