From 3c87b31f4b9dc5766429e41b4ef50bed5198a448 Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Thu, 18 Aug 2022 08:44:58 -0700
Subject: [PATCH] Trypandoc: better error handling.

---
 trypandoc/index.html | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/trypandoc/index.html b/trypandoc/index.html
index 26e871816..86b5ee6cc 100644
--- a/trypandoc/index.html
+++ b/trypandoc/index.html
@@ -212,6 +212,13 @@ function paramsFromURL() {
   }
 }
 
+function handleErrors(response) {
+    if (!response.ok) {
+        throw Error(response.statusText);
+    }
+    return response;
+}
+
 function convert() {
     let text = document.getElementById("text").value;
     let from = document.getElementById("from").value;
@@ -223,6 +230,10 @@ function convert() {
 
     if (text && text != "") {
        fetch("/cgi-bin/pandoc-server.cgi/version")
+          .then(handleErrors)
+          .catch(error =>
+            document.getElementById("results").textContent = error
+            )
           .then(response => response.text())
           .then(restext =>
               document.getElementById("version").textContent = restext