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<!DOCTYPE html>
<title>MathJax Signals Test Page</title>
<!-- Copyright (c) 2010-2012 Design Science, Inc. -->
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
| This example shows how to use MathJax's signal mechanism to find out
| about what MathJax is doing, and to hook into various events as they
| occur.
<script type="text/x-mathjax-config">
// Configure MathJax
extensions: ["tex2jax.js","TeX/noUndefined.js"],
jax: ["input/TeX","output/HTML-CSS"],
tex2jax: {inlineMath: [["$","$"],["\\(","\\)"]]},
TeX: {extensions: ["AMSmath.js","AMSsymbols.js"]}
// Display messages when these files are loaded
// (Note the difference between extensions and TeX.extensions,
// and the difference between when noUndefind is loaded compared
// to when it signals that it is ready)
function () {MathJax.Hub.Startup.signal.Post("*** noUndefined Loaded ***")});
function () {MathJax.Hub.Startup.signal.Post("*** AMSmath Loaded ***")});
// Display a message that we are in the configuration code
// (The Message function is not yet defined when this code
// runs, so we can't use that here. Post a signal
// of our own, so it will be displayed along with all
// the other signals).
MathJax.Hub.Startup.signal.Post("*** In Startup Configuration code ***");
// When the "onLoad" message is posted, display a message.
// (Since this hook is registered before the ones in the main body
// below, it runs before the code to print the "Startup: onLoad"
// message, so this message shows up first in the output.)
MathJax.Hub.Register.StartupHook("onLoad",function () {
Message("*** The onLoad handler has run, page is ready to process ***");
// This will be performed after MathJax has completed its
// setup and typesetting run, which have already been
// pushed onto the queue.
// (Since the Message function isn't defined yet when this code
// runs, we need to enclose it in a function so it will be
// looked up later when it is defined.)
MathJax.Hub.Queue(function () {Message("*** MathJax is done ***")});
<script type="text/javascript" src="../MathJax.js"></script>
.output {
background-color: #F0F0F0;
border-top: 1px solid;
border-bottom: 1px solid;
padding: 3px 1em;
When \(a \ne 0\), there are two solutions to \(ax^2 + bx + c = 0\) and they are
$$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$
Messages about mathematics:
<pre id="MathMessages" class="output">
All Messages:
<pre id="AllMessages" class="output">
(function () {
// The output areas
var math = document.getElementById("MathMessages");
var all = document.getElementById("AllMessages");
// A function to display messages in the "AllMessages" area.
// We make it global so it can be used in the startup code above.
window.Message = function (message) {
// Find out about "New Math" messages from the Hub and display them.
// (Look up the TeX code for each new math element)
MathJax.Hub.Register.MessageHook("New Math",function (message) {
var script = MathJax.Hub.getJaxFor(message[1]).SourceElement();
MathJax.HTML.addText(math,message.join(" ")+": '"+script.text+"'");
// Find out about ALL startup and hub messages
MathJax.Hub.Startup.signal.Interest(function (message) {Message("Startup: "+message)});
MathJax.Hub.signal.Interest(function (message) {Message("Hub: "+message)});
// Since signals are remembered, registering an interest will cause
// use to receive all the past signals as well as new ones.
// This marks the point were the above routines were called.
Message("##### events above this have already occurred #####");
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