site: use errormsg function for general survey errors

the previous commit introduced handling error messages using a
"setErrormsg" function. This is now also used for the general error
messages which may show up at the bottom of surveys.

However, since js and async things are weird, the code there is still a
long repetitive mess which can't really be cut down further.

2 files changed, 12 insertions, 11 deletions

diff --git a/site/index.html b/site/index.html
index 70d487b..6141163 100644
--- a/site/index.html
+++ b/site/index.html
@@ -172,13 +172,15 @@
 
          let footer = mkElement("section");
          let submit = mkElement("button", _("submit"));
-         let errormsg = mkElement("p", "", "error");
+         let errormsg = setErrormsg (
+             mkElement("p", "", "error"),
+             null
+         );
          appendChildren(footer, [
              mkElement("hr"),
              submit,
              errormsg
          ]);
-         errormsg.hidden = true;
          submit.onclick = () => {
              // the callback over the complete survey just maps all
              // other callbacks to their values, i.e. calls them all
@@ -207,18 +209,17 @@
                          console.log(response.text())
                          window.location.href = "thanks.html";
                      }
-                     errormsg.innerText = _("Error: post returned error") + "\n"
-                                        + response.status + ": " + response.statusText;
-                     errormsg.hidden = false;
+                     setErrormsg(errormsg,
+                         _("Error: post returned error") + "\n"
+                         + response.status + ": " + response.statusText
+                     );
                  }).catch(error => {
                      console.log(error);
-                     errormsg.innerText = _("Error: could not post");
-                     errormsg.hidden = false;
+                     setErrormsg(errormsg, _("Error: could not post"));
                  });
 
              } else {
-                 errormsg.innerText = _("Error: answers invalid");
-                 errormsg.hidden = false;
+                 setErrormsg(errormsg, _("Error: answers invalid"));
              }
          }
          root.appendChild(footer);
diff --git a/todo.org b/todo.org
index 6c5ccb6..f1fb03c 100644
--- a/todo.org
+++ b/todo.org
@@ -5,8 +5,8 @@
 ** IDEA date picker
 
 * TODO Answer validation
-** TODO general error messages
-** TODO for unchosen radio buttons
+** DONE general error messages
+** DONE for unchosen radio buttons
 ** IDEA via regular expressions (e.g. for emails)
 ** IDEA via length