add docs for get_asset_url

Author: LiamConnors

dash/_get_paths.py

@@ -5,6 +5,13 @@
 
 
 def get_asset_url(path):
+    """
+    Return the URL for the provided `path` in the assets directory.
+
+    `dash.get_asset_url` is not compatible with Dash Snapshots.
+    Use `get_asset_url` on the app instance instead: `app.get_asset_url`.
+    See `app.get_asset_url` for more information.
+    """
     return app_get_asset_url(CONFIG, path)
 
 

dash/dash.py

@@ -1547,6 +1547,35 @@ def _hash(script):
         ]
 
     def get_asset_url(self, path):
+        """
+        Return the URL for the provided `path` in the assets directory.
+
+        If `assets_external_path` is set, `get_asset_url` returns
+        `assets_external_path` + `assets_url_path` + `path`, where
+        `path` is the path passed to `get_asset_url`.
+
+        Otherwise, `get_asset_url` returns
+        `requests_pathname_prefix` + `assets_url_path` + `path`, where
+        `path` is the path passed to `get_asset_url`.
+
+        Use `get_asset_url` in an app to access assets at the correct location
+        in different environments. `requests_pathname_prefix` in a deployed app
+        on Dash Enterprise includes the app name.
+
+        For an app on Dash Enterprise called "my-app",
+        `app.get_asset_url("image.png")` would return:
+
+        ```
+        /my-app/assets/image.png
+        ```
+
+        While the same app running locally,
+        without `requests_pathname_prefix` set would return:
+
+        ```
+        /assets/image.png
+        ```
+        """
         return _get_paths.app_get_asset_url(self.config, path)
 
     def get_relative_path(self, path):