i load a html file in editor and want to count total words in  editor and also the result should be shown in pop up window.

Please try the following steps:

 

1. Create a custom button.

2. When the people click the custom button, you use the Editor.PlainText property get all total words.

 

2. Then you can count total words based onn the result.

 

This is an example showing you how to create a server side custom button: