How to use a confirmation button in Google Apps Script spreadsheet embedded scripts? - user-interface

Question

I have this Google Apps Script to send an email with a request to people I choose in a spreadsheet:
function sendRequestEmail() {
var data = SpreadsheetApp.openById(SPREADSHEET);
if(!employee_ID) {
employee_ID = getCurrentRow();
if (employee_ID == 1) {
var employee_ID = Browser.inputBox("Você precisa selecionar um assistido?", "Choose a row or type its number here:", Browser.Buttons.OK_CANCEL);
}
}
// Fetch variable names
// they are column names in the spreadsheet
var sheet = data.getSheets()[0];
var columns = getRowAsArray(sheet, 1);
Logger.log("Processing columns =" + columns);
var employeeData = getRowAsArray(sheet, employee_ID);
Logger.log("Processing employeeData = " + employeeData);
// Assume first column holds the name of the person
var email2Send = "pythonist#example.com";
var title = "Request by email";
var name = employeeData[0];
var mother_name = employeeData[1];
var message = "Hi, I have a request for you, " + name + ", this is... example";
// HERE THE
// CONFIRMATION BUTTON!!!
MailApp.sendEmail(email2Send, title, message);
}
And, before sending the email, I want a confirmation button, something like this:
function showConfirmation(name, email2Send) {
var app = UiApp.createApplication().setHeight(150).setWidth(250);
var msg = "Do you confirm the request to " + email2Send + " about " + name + "?";
app.setTitle("Confirmation of request");
app.add(app.createVerticalPanel().add(app.createLabel(msg)));
var doc = SpreadsheetApp.getActive();
doc.show(app);
}
So, if user press OK, the app will execute the line MailApp.sendEmail(email2Send, title, message); and send an e-mail.
I have to admit my ignorance. I'm reading chapter 4 of the book "Google Apps Script" (Oreilly, by James Ferreira) on handlers. I've tried using an example provided in the documentation from Google (already deleted the code!). But I came across an error that I could not understand.
The code used were this sample:
var ui = DocumentApp.getUi();
var response = ui.prompt('Getting to know you', 'May I know your name?', ui.ButtonSet.YES_NO);
// Process the user's response.
if (response.getSelectedButton() == ui.Button.YES) ... DO THIS
I have some urgency in this simple project, so forgive-me for asking this question before research more for the answer (I'm searching for it while wating for the answer). So, how can I use a confirmation/cancellation button in this code?

Answer 1

The code snippet you showed is for document embedded UI, the equivalent (well... almost) class for spreadsheet context is Browser.MsgBox(prompt,buttons), see doc here, it will be simpler than create a Ui + a handler function... even if the layout and appearance are fairly basic it's easy and efficient.
In your code it becomes :
...
var confirm = Browser.msgBox('send confirmation','Are you sure you want to send this mail ?', Browser.Buttons.OK_CANCEL);
if(confirm=='ok'){ MailApp.sendEmail(email2Send, title, message)};
...