Fix the onload callback as found by @andreabedini in #2310

mdboom · mdboom · commit 2b241cf13f61 · 2013-08-26T15:42:17.000-04:00
diff --git a/lib/matplotlib/backends/web_backend/mpl.js b/lib/matplotlib/backends/web_backend/mpl.js
@@ -43,9 +43,9 @@ function figure(fig_id, websocket_url_prefix, parent_element) {
     init_mpl_toolbar(this);
 
     this.ws.onopen = function () {
-        this.ws.send(JSON.stringify(
+        this.send(JSON.stringify(
             {type: 'supports_binary',
-             value: this.supports_binary}));
+             value: fig.supports_binary}));
     }
 
     fig = this
