shithub: puzzles

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Try to give a more friendly message if anything goes wrong during
puzzle startup. The puzzle web pages now enclose the whole puzzle
(buttons, canvas, permalinks) in a div set to display:none, and
instead display an apologetic message saying 'sorry, it didn't work';
then, if we get through the whole init function without crashing, we
show the puzzle and hide the apology.

[originally from svn r9802]

--- a/emccpre.js

+++ b/emccpre.js

@@ -257,9 +257,16 @@

     // Default to giving keyboard focus to the puzzle.

     onscreen_canvas.focus();

-    // And run the C setup function, passing argv[1] as the fragment

+    // Run the C setup function, passing argv[1] as the fragment

     // identifier (so that permalinks of the form puzzle.html#game-id

     // can launch the specified id).

     Module.arguments = [location.hash];

     Module.run();

+

+    // And if we get here with everything having gone smoothly, i.e.

+    // we haven't crashed for one reason or another during setup, then

+    // it's probably safe to hide the 'sorry, no puzzle here' div and

+    // show the div containing the actual puzzle.

+    document.getElementById("apology").style.display = "none";

+    document.getElementById("puzzle").style.display = "inline";

 }

--- a/html/jspage.pl

+++ b/html/jspage.pl

@@ -71,6 +71,7 @@

 ${unfinishedpara}

 <hr>

+<div id="puzzle" style="display: none">

 <p align=center>

   <input type="button" id="new" value="New game">

   <input type="button" id="restart" value="Restart game">

@@ -98,6 +99,13 @@

   <a id="permalink-desc">by game ID</a>

   <a id="permalink-seed">by random seed</a>

 </p>

+</div>

+<div id="apology">

+Sorry, this Javascript puzzle doesn't seem to work on your web

+browser. Perhaps you have Javascript disabled, or perhaps your browser

+doesn't provide a feature they depend on. These puzzles have been

+successfully run in Firefox 19 and Chrome 25.

+</div>

 <hr>

 ${instructions}