Apps Script - How can I get the selected text by the user in google doc?

[Zain Manna]

I am trying to build a google doc add-on that capitalize the selected text by the user, but the first step i am trying to do is to log the selected text to the console. 

Can someone help in this? 

I wrote this in the client side (html):

$(document).ready(function() {

$('#selectionButton').click(function() {

var selectedText = window.getSelection().toString();

console.log("Selected Text:", selectedText);

});

});

And this in the server-side: 

function getSelection() {

var selection = DocumentApp.getActiveDocument().getSelection();

var selectedText = selection.getRangeElements()[0].getElement().asText().getText();

// Log the selected text to the console

console.log("Selected Text:", selectedText);

}

But I am getting nothing!

[Brett Grear]

What is the use case? This functionality exists in Google Docs already. 

However, you can do it server side. You wouldn't need any client side code if you make it a workspace add-on.  I don't think it would pass verification though seeing as it doesn't add anything new.

[Zain Manna]

and how can i access this function? 

I need to build a google add-ons that capitalize the selected text with keeping the formatting on a document, but I am not able to do this, because when the text is capitalized the formatting of the text is gone.   

[Zain Manna]

i mean the code of this functionality.