1 files changed, 63 insertions, 0 deletions
diff --git a/app/assets/javascripts/autosave.js b/app/assets/javascripts/autosave.js
new file mode 100644
index 00000000000..7116512d6b7
--- /dev/null
+++ b/app/assets/javascripts/autosave.js
@@ -0,0 +1,63 @@
+(function() {
+  this.Autosave = (function() {
+    function Autosave(field, key) {
+      this.field = field;
+      if (key.join != null) {
+        key = key.join("/");
+      }
+      this.key = "autosave/" + key;
+      this.field.data("autosave", this);
+      this.restore();
+      this.field.on("input", (function(_this) {
+        return function() {
+          return _this.save();
+        };
+      })(this));
+    }
+
+    Autosave.prototype.restore = function() {
+      var e, error, text;
+      if (window.localStorage == null) {
+        return;
+      }
+      try {
+        text = window.localStorage.getItem(this.key);
+      } catch (error) {
+        e = error;
+        return;
+      }
+      if ((text != null ? text.length : void 0) > 0) {
+        this.field.val(text);
+      }
+      return this.field.trigger("input");
+    };
+
+    Autosave.prototype.save = function() {
+      var text;
+      if (window.localStorage == null) {
+        return;
+      }
+      text = this.field.val();
+      if ((text != null ? text.length : void 0) > 0) {
+        try {
+          return window.localStorage.setItem(this.key, text);
+        } catch (undefined) {}
+      } else {
+        return this.reset();
+      }
+    };
+
+    Autosave.prototype.reset = function() {
+      if (window.localStorage == null) {
+        return;
+      }
+      try {
+        return window.localStorage.removeItem(this.key);
+      } catch (undefined) {}
+    };
+
+    return Autosave;
+
+  })();
+
+}).call(this);