move anki to async

1 files changed, 25 insertions, 0 deletions

diff --git a/ext/bg/js/util.js b/ext/bg/js/util.js
index b8a60217..4f907923 100644
--- a/ext/bg/js/util.js
+++ b/ext/bg/js/util.js
@@ -428,6 +428,31 @@ function dictFieldFormat(field, definition, mode, options) {
     return field;
 }
 
+/*
+ * JSON
+ */
+
+function jsonRequest(url, action, params) {
+    return new Promise((resolve, reject) => {
+        const xhr = new XMLHttpRequest();
+        xhr.overrideMimeType('application/json');
+        xhr.addEventListener('load', () => resolve(xhr.responseText));
+        xhr.addEventListener('error', () => reject('failed to execute network request'));
+        xhr.open(action, url);
+        if (params) {
+            xhr.send(JSON.stringify(params));
+        } else {
+            xhr.send();
+        }
+    }).then(responseText => {
+        try {
+            return JSON.parse(responseText);
+        }
+        catch (e) {
+            return Promise.reject('invalid JSON response');
+        }
+    });
+}
 
 /*
  * Helpers