Update math processing errors to include original format and actual error message in the Show Math As menu. Resolves issue #450.

unpacked/MathJax.js

@@ -33,7 +33,7 @@ if (!window.MathJax) {window.MathJax= {}}
 if (!MathJax.Hub) {  // skip if already loaded
   
 MathJax.version = "2.1";
-MathJax.fileversion = "2.1.3";
+MathJax.fileversion = "2.1.4";
 
 /**********************************************************/
 
@@ -1633,7 +1633,8 @@ MathJax.Hub = {
         //
         //  Check that there is an element jax
         //
-        script = state.scripts[state.i]; if (!script || !script.MathJax) {state.i++; continue}
+        script = state.scripts[state.i];
+        if (!script || !script.MathJax || script.MathJax.error) {state.i++; continue}
         var jax = script.MathJax.elementJax; if (!jax) {state.i++; continue}
         //
         //  Call the output Jax's Process method (which will be its Translate()
@@ -1681,8 +1682,23 @@ MathJax.Hub = {
   },
   
   formatError: function (script,err) {
-    var error = MathJax.HTML.Element("span",{className:"MathJax_Error"},this.config.errorSettings.message);
+    //
-    error.jaxID = "Error";
+    //  Get the error message, URL, and line, and save it for
+    //    reporting in the Show Math As Error menu
+    //
+    var message = "Error: "+err.message+"\n";
+    if (err.sourceURL) {message += "\nfile: "+err.sourceURL}
+    if (err.line) {message += "\nline: "+err.line}
+    script.MathJax.error = MathJax.OutputJax.Error.Jax(message,script);
+
+    //
+    //  Create the [Math Processing Error] span
+    //
+    var error = MathJax.HTML.Element("span",{className:"MathJax_Error", jaxID: "Error"},
+                                     this.config.errorSettings.message);
+    //
+    //  Attach the menu events
+    //
     if (MathJax.Extension.MathEvents) {
       error.oncontextmenu = MathJax.Extension.MathEvents.Event.Menu;
       error.onmousedown = MathJax.Extension.MathEvents.Event.Mousedown;
@@ -1692,8 +1708,15 @@ MathJax.Hub = {
         error.onmousedown = MathJax.Extension.MathEvents.Event.Mousedown;
       });
     }
+    //
+    //  Insert the error into the page and remove any preview
+    //
     script.parentNode.insertBefore(error,script);
     if (script.MathJax.preview) {script.MathJax.preview.innerHTML = ""}
+    //
+    //  Save the error for debugging purposes
+    //  Report the error as a signal
+    //
     this.lastError = err;
     this.signal.Post(["Math Processing Error",script,err]);
   },
@@ -2220,6 +2243,7 @@ MathJax.Hub.Startup = {
     inputID: null,
     originalText: "",
     mimeType: "",
+    sourceMenuTitle: "MathML Code",
     
     Text: function (text,callback) {
       var script = this.SourceElement();
@@ -2309,14 +2333,23 @@ MathJax.Hub.Startup = {
   //  Some "Fake" jax used to allow menu access for "Math Processing Error" messages
   //
   BASE.OutputJax.Error = {
-    id: "Error", version: "2.1", config: {},
+    id: "Error", version: "2.1.1", config: {},
     ContextMenu: function () {return BASE.Extension.MathEvents.Event.ContextMenu.apply(BASE.Extension.MathEvents.Event,arguments)},
     Mousedown:   function () {return BASE.Extension.MathEvents.Event.AltContextMenu.apply(BASE.Extension.MathEvents.Event,arguments)},
-    getJaxFromMath: function () {return {inputJax:"Error", outputJax:"Error", originalText:"Math Processing Error"}}
+    getJaxFromMath: function (math) {return (math.nextSibling.MathJax||{}).error},
+    Jax: function (text,script) {
+      var jax = MathJax.Hub.inputJax[script.type.replace(/ *;(.|\s)*/,"")];
+      return {
+        inputJax: (jax||{id:"Error"}).id,  // Use Error InputJax as fallback
+        outputJax: "Error", 
+        sourceMenuTitle: "Error Message", sourceMenuFormat: "Error",
+        originalText: MathJax.HTML.getScript(script),
+        errorText: text
+      }
+    }
   };
   BASE.InputJax.Error = {
-    id: "Error", version: "2.1", config: {},
+    id: "Error", version: "2.1.1", config: {}
-    sourceMenuTitle: "Error Message"
   };
   
 })("MathJax");

unpacked/extensions/MathEvents.js

@@ -23,7 +23,7 @@
  */
 
 (function (HUB,HTML,AJAX,CALLBACK,OUTPUT,INPUT) {
-  var VERSION = "2.1";
+  var VERSION = "2.1.1";
   
   var EXTENSION = MathJax.Extension;
   var ME = EXTENSION.MathEvents = {version: VERSION};
@@ -148,8 +148,9 @@
       if (MENU) {
         MENU.jax = jax;
         var source = MENU.menu.Find("Show Math As").menu;
+        source.items[0].name = (jax.sourceMenuTitle||"MathML Code");
+        source.items[0].format = (jax.sourceMenuFormat||"MathML");
         source.items[1].name = (INPUT[jax.inputJax].sourceMenuTitle||"Original Form");
-        source.items[0].hidden = (jax.inputJax === "Error");  // hide MathML choice for error messages
         var MathPlayer = MENU.menu.Find("Math Settings","MathPlayer");
         MathPlayer.hidden = !(jax.outputJax === "NativeMML" && HUB.Browser.hasMathPlayer);
         return MENU.menu.Post(event);

unpacked/extensions/MathMenu.js

@@ -24,7 +24,7 @@
  */
 
 (function (HUB,HTML,AJAX,CALLBACK,OUTPUT) {
-  var VERSION = "2.1";
+  var VERSION = "2.1.1";
 
   var SIGNAL = MathJax.Callback.Signal("menu")  // signal for menu events
   
@@ -689,6 +689,8 @@
         );
         return;
       }
+    } else if (this.format === "Error") {
+      MENU.ShowSource.Text(MENU.jax.errorText,event);
     } else {
       if (MENU.jax.originalText == null) {alert("No original form available"); return}
       MENU.ShowSource.Text(MENU.jax.originalText,event);