Add default URL for plotlyServerURL

Author: marthacryan

src/plot_api/plot_config.js

@@ -33,7 +33,7 @@ var configAttributes = {
 
     plotlyServerURL: {
         valType: 'string',
-        dflt: '',
+        dflt: 'https://cloud.plotly.com/upload',
         description: [
             'Sets the URL for the `sendChartToCloud` modebar button.',
             'When clicked, the button will send the chart data to this URL.',

src/plots/plots.js

@@ -209,6 +209,8 @@ plots.sendDataToCloud = function(gd) {
     }
 
     // Plotly Cloud origin, used to validate incoming messages and to target outgoing ones.
+    // `baseUrl` (plotlyServerURL) is the upload page that handles login and signals
+    // back when authentication succeeds.
     var cloudOrigin;
     try {
         cloudOrigin = new URL(baseUrl).origin;
@@ -217,9 +219,6 @@ plots.sendDataToCloud = function(gd) {
         return;
     }
 
-    // The page that handles login and signals back when authentication succeeds.
-    var uploadUrl = baseUrl.replace(/\/+$/, '') + '/upload';
-
     gd.emit('plotly_beforeexport');
 
     // Build the request body: the chart JSON plus the plotly.js version used to
@@ -229,7 +228,7 @@ plots.sendDataToCloud = function(gd) {
 
     // Open the Cloud login page in a new tab. We keep a reference so we can post
     // the chart back to it once Cloud reports that authentication succeeded.
-    var cloudWindow = window.open(uploadUrl, '_blank');
+    var cloudWindow = window.open(baseUrl, '_blank');
     if(!cloudWindow) {
         console.error('Unable to open Plotly Cloud (the popup may have been blocked)');
         gd.emit('plotly_afterexport');

test/plot-schema.json

@@ -280,7 +280,7 @@
     },
     "plotlyServerURL": {
       "description": "Sets the URL for the `sendChartToCloud` modebar button. When clicked, the button will send the chart data to this URL.",
-      "dflt": "",
+      "dflt": "https://cloud.plotly.com/upload",
       "valType": "string"
     },
     "queueLength": {