Replace $.ajax() with fetch()

Ticket: https://progress.opensuse.org/issues/166310
Co-authored-by: Martchus <[email protected]>

assets/javascripts/openqa.js

@@ -23,6 +23,16 @@ function setupForAll() {
   });
 }
 
+function getCSRFToken() {
+  return document.querySelector('meta[name="csrf-token"]').content;
+}
+
+function fetchWithCSRF(resource, options) {
+  options.headers ??= {};
+  options.headers['X-CSRF-TOKEN'] ??= getCSRFToken();
+  return fetch(resource, options);
+}
+
 function makeFlashElement(text) {
   return typeof text === 'string' ? '<span>' + text + '</span>' : text;
 }

assets/javascripts/tests.js

@@ -191,16 +191,17 @@ function changeJobPrio(jobId, delta, linkElement) {
   }
 
   var newPrio = currentPrio + delta;
-  $.ajax({
-    url: urlWithBase('/api/v1/jobs/' + jobId + '/prio?prio=' + newPrio),
-    method: 'POST',
-    success: function (result) {
-      prioValueElement.text(newPrio);
-    },
-    error: function (xhr, ajaxOptions, thrownError) {
-      addFlash('danger', 'Unable to set the priority value of job ' + jobId + '.');
-    }
-  });
+
+  fetchWithCSRF(urlWithBase(`/api/v1/jobs/${jobId}/prio?prio=${newPrio}`), {method: 'POST'})
+    .then(response => {
+      if (response.status == 200) prioValueElement.text(newPrio);
+      else
+        addFlash('danger',
+                 `Unable to set the priority value of job ${jobId}: Server returned ${response.status}: ${response.statusText}`);
+    })
+    .catch(error => {
+      addFlash('danger', `Unable to set the priority value of job ${jobId}: ${error}`);
+    });
 }
 
 function renderTestSummary(data) {