make shell.html more robust if no canvas support

1 files changed, 7 insertions, 3 deletions

diff --git a/src/shell.html b/src/shell.html
index 284bc8d6..87c285ea 100644
--- a/src/shell.html
+++ b/src/shell.html
@@ -19,10 +19,14 @@
 
       // connect to canvas
       var Module = {
-        canvas: document.getElementById('canvas'),
-        ctx2D: document.getElementById('canvas').getContext('2d')
+        canvas: document.getElementById('canvas')
       };
-      if (!Module.ctx2D) alert('Canvas not available :(');
+      try {
+        Module.ctx2D = Module.canvas.getContext('2d');
+        if (!Module.ctx2D) throw 'Could not create canvas :(';
+      } catch (e) {
+        print('(canvas not available)');
+      }
 
       // The compiled code
       {{{ SCRIPT_CODE }}}