Add custom client-side logic to the JavaScript file of the News designer 
If you want to add additional client-side logic to the default designer view, you need to override the default designer JavaScript file. To do this, perform the following:
    - In your SitefinityWebApp, in folder 
Mvc, create a folder and name it Scripts 
    - In folder 
Mvc/Scripts/, create a folder and name it News 
    - In folder 
Mvc/Scripts/News/, create a file designerview-simple.js 
    - In the file, paste the following code:
    
    
 
    - Add your custom client-side logic.
 
    - Save and close the file.