From a86cc7dd09b07d0e722a4023922d43e85205b341 Mon Sep 17 00:00:00 2001
From: Dmitri <marcusstrajuser@gmail.com>
Date: Fri, 23 Mar 2018 19:03:22 +0300
Subject: [PATCH] no-callback fix for jsonp with server error (#1070)

* no-callback fix for jsonp with server error

* jsonp unknown error message update
---
 src/Request.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/Request.js b/src/Request.js
index b5aaad262..38056cb22 100644
--- a/src/Request.js
+++ b/src/Request.js
@@ -187,6 +187,20 @@ export function jsonp (url, params, callback, context) {
   script.type = 'text/javascript';
   script.src = url + '?' + serialize(params);
   script.id = callbackId;
+  script.onerror = function (error) {
+    if (error && window._EsriLeafletCallbacks[callbackId] !== true) {
+      // Can't get true error code: it can be 404, or 401, or 500
+      var err = {
+        error: {
+          code: 500,
+          message: 'An unknown error occurred'
+        }
+      };
+
+      callback.call(context, err);
+      window._EsriLeafletCallbacks[callbackId] = true;
+    }
+  };
   DomUtil.addClass(script, 'esri-leaflet-jsonp');
 
   callbacks++;