Fix open image in app or externally (instead of popup) (#37)

Fix #195 on Ferdium-app which causes a problem when opening images inside the discord (and possibly zoom).

1 files changed, 18 insertions, 1 deletions

diff --git a/docs/frontend_api.md b/docs/frontend_api.md
index af9acf8..f1edc0f 100644
--- a/docs/frontend_api.md
+++ b/docs/frontend_api.md
@@ -29,9 +29,12 @@
     - [safeParseInt(stringText)](#safeparseintstringtext)
       - [Arguments](#arguments-8)
       - [Usage](#usage-8)
-    - [setDialogTitle(title)](#setdialogtitletitle-1)
+    - [isImage(url)](#isimageurl)
       - [Arguments](#arguments-9)
       - [Usage](#usage-9)
+    - [setDialogTitle(title)](#setdialogtitletitle-1)
+      - [Arguments](#arguments-10)
+      - [Usage](#usage-10)
 
 # Frontend API
 
@@ -305,6 +308,20 @@ A utility method that can be used to safely parse the text content (handles null
 Ferdium.safeParseInt(mySelector.innerText)
 ```
 
+### isImage(url)
+
+A utility method that can be used to verify if a url is an image. Returns `true` if is image and `false` if it is not an image.
+
+#### Arguments
+
+1. `url` Url to be parsed.
+
+#### Usage
+
+```JavaScript
+Ferdium.isImage(url)
+```
+
 ### setDialogTitle(title)
 
 When you want to set the title of the Ferdium window (while this service is active or in focus), you can use this function