Creating a custom menu

You might be wondering whether you can execute the greeting function without the help of the button. The answer is yes. In the script editor, there is a Run menu. If you click on Run | greeting, then the greeting function will be executed and the message box will open.

Creating a button for every function may not be feasible. Although you cannot alter or add items to the application's standard menu (except the Add-ons menu) such as File, Edit, View, and so on, you can add custom menus and menu items.

For this task, create a new Google Docs document or open an existing document. Open the script editor and type these two functions:

function createMenu() {
  DocumentApp.getUi()
   .createMenu("PACKT")
   .addItem("Greeting","greeting")
   .addToUi();
}

function greeting() {
  var ui = DocumentApp.getUi();
  ui.alert("Greeting", "Hello World!", ui.ButtonSet.OK);
}

In the first function, you are using the DocumentApp...