'Mathematical representation' does not work

[gkronber]

We got a bug report on the mailing list that the view for mathematical representation does not work correctly.

Steps to reproduce:

1. Download HL 3.3.15 from website
2. Start and open Genetic Programming - Symbolic Regression Sample
3. Start algorithm and check results
4. Select "Best training solution" -> Model
5. Switch View to "Mathematical Representation" using ViewHost
6. An error dialog occurs (below)

Potentially related to #2841.

[gkronber]

Probably, this can be solved by updating MathJax to a recent version.

[gkronber]

Systems for which the problem has been reported:

1. Microsoft Windows 7 Home Premium SP1 and Internet Explorer version 11.0.9600.19180
2. Microsoft Windows 10 Education and Internet Explorer 11.2248.14393.0

[gkronber]

r16309: updated MathJax version to most recent version (2.7.5).

This solves the problem on my system (Microsoft Windows 10 Education and Internet Explorer 11.2248.14393.0)

[gkronber]

Please check if "mathematical representation" still works on your system.

[mkommend]

Displaying equation with the new MathJax Version 2.7.5 works on both of my machines (Win10 and Win7). However, something is wrong in the view implementation (see screenshot below), because no context menu entry can be opened.

[gkronber]

The original problem persists even after the update of MathJax to version 2.7.5.

The MathJax.zip file is extracted on the first start of HL after downloading. It seems that the automatic extraction does not work correctly (permissions?). When the MathJax.zip file is extracted manually, the view for "mathematical representation" works correctly.

[gkronber]

Might also have to do with this

or with this

[gkronber]

related? ​https://stackoverflow.com/questions/8146926/why-does-ie-restrict-the-javascript-files-of-local-html-pages

[mkommend]

What about switching from IE to another browser for displaying web pages? For example ​http://cefsharp.github.io/ that is based on chromium.

This could also get rid of the context menu bug that has been introduced in that ticket. Apparently the detachEvent functionality is not used any more in the new MathJax version. Only in MathMenu.js line 382:

if (this.msieFixedPositionBug) {detachEvent("onresize",MENU.Resize)}

and one other occasion it is used. In the previous version it has been used approx 100 times.

[gkronber]

The cefsharp nuget packages (with all dependencies) amount to over 400 MB. I think we should consider other options.

[gkronber]

Maybe this: ​https://github.com/ForNeVeR/wpf-math ?

[gkronber]

It seems it's possible to programmatically unblock a file

​https://weblogs.asp.net/dixin/understanding-the-internet-file-blocking-and-unblocking

[gkronber]

Did some more research:

• Does not work: Download HL -> Unzip -> Run HeuristicLab 3.3.exe
• Works: Download HL -> Unblock HeuristicLab.Zip -> Unzip -> Run HeuristicLab 3.3.exe
• Does not work: Download HL -> Unzip -> Unblock MathJax.zip -> Run HeuristicLab 3.3.exe
• Does not work: Download HL -> Unzip -> Unblock HeuristicLab 3.3.exe -> Run HeuristicLab 3.3.exe
• Works: Download HL -> Unzip -> Unblock displayModelFrame.html -> Run HeuristicLab 3.3.exe

[gkronber]

r16341: programmatically unblock (remove Zone.Identifier alternative stream) displayModelFrame.html to allow WebBrowser control to execute MathJax scripts.

[gkronber]

r16342: added LaTeX expression for testing MathJax output

[gkronber]

r16343: edited MathMenu.js in MathJax.zip and commented out code which caused problems:

      // if (MENU.msieFixedPositionBug) {
      //   //  MSIE can't do fixed position, so use a full-sized background
      //   //  and an onresize handler to update it (stupid, but necessary)
      //   div.width = div.height = 0; this.Resize();
      //   attachEvent("onresize",this.Resize);
      // } else {
        // otherwise, use a fixed position DIV to cover the viewport
        bg.style.position = "fixed";
      // }

...

 /* if (this.msieFixedPositionBug) {detachEvent("onresize",MENU.Resize)} */

[mkommend]

Reviewed changes r16309, r16341, r16342, r16343 and test the functionality. Everything works as expected on my machine.

[gkronber]

r16492: merged r16309, r16341, r16342, r16343 from trunk to stable

[gkronber]

r17169: update mergeinfo: r16309, r16341, r16342, r16343 have been merged to stable (see r16492)