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December 20, 2015 05:39
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JavaScript/MathJax method to flag for errors on a page containing TeX math: Flags for either TeX errors (undefined control sequence) or Math errors (for example, missing brace). Code stolen from a couple of threads on MathJax Users Google Group:
https://groups.google.com/forum/#!msg/mathjax-users/ct4drdifuyI/h61GSTt_-bAJ
https://groups.google.co…
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Encapsulate Trapping of Math and TeX errors</title> | |
| <script type="text/x-mathjax-config"> | |
| // Turn off NoErrors extension | |
| MathJax.Hub.Config({ | |
| TeX: {noErrors: {disabled: true}} | |
| }); | |
| // Set flag function for TeX Errors (undefined cs) | |
| MathJax.Hub.Register.StartupHook("TeX noUndefined Ready",function () { | |
| var TEX = MathJax.InputJax.TeX; | |
| var formatError = TEX.formatError; | |
| TEX.Augment({ | |
| formatError: function (err,math,displaystyle,script) { | |
| alert("Error in math: "+math+"\nMessage: "+err.message.replace(/\n.*/,"")); | |
| return formatError.apply(this,arguments); | |
| } | |
| }); | |
| TEX.Parse.Augment({ | |
| csUndefined: function (name) { | |
| TEX.Error("Undefined control sequence "+name); | |
| } | |
| }); | |
| }); | |
| // Set flag function for Math errors (malformed syntax like missing brace) | |
| function EncapsulatedTypeset (node,success,failure) { | |
| var HUB = MathJax.Hub; | |
| return HUB.Typeset(node,function () { | |
| var math = HUB.getAllJax(node)[0]; | |
| if (!math.texError) {success(node,math)} | |
| else {failure(node,math,math.root.HTMLspanElement().textContent)} | |
| }); | |
| } | |
| </script> | |
| <!-- Setup complete, now load MathJax --> | |
| <script type="text/javascript" | |
| src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML"> | |
| </script> | |
| </head> | |
| <body> | |
| <p> | |
| The <tt>rule</tt> tag is undefined: | |
| \[\rule{3in}{1pt}x+1\over {1-x}\] | |
| </p> | |
| <p> | |
| The math has a missing brace: | |
| \[x+1\over {1-x\] | |
| </p> | |
| <p> | |
| The math is defined and is well-formed: | |
| \[x+1\over {1-x}\] | |
| </p> | |
| </body> | |
| </html> |
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Learned from this example and the MathJax Google group; created an enhanced version here:
https://gist.github.com/tiarno/6116323