Send HTML email from google spreadsheet using a button - google-apps-script

Question

I am new to stack overflow and am looking for some advice and some guidance on a google spreadsheet i have been working on.
A demo of it can be found at
https://docs.google.com/spreadsheets/d/1t9WfcG_1_mAavpN0l3v58JdD04Y1lL3PhAEoTUkq0Z4/edit?usp=sharing
Basically the jist of it is that i require the following.
A sendEmail button in the tool bar at the top that will send a html formatted email to any email on the active page in a specific colour.
Essentially this is to allow me to send reminder to clients in groups and by colour status. Currently i have to mail each client individually using a canned response which is pretty time consuming.
So far i am using the following script as a basis, i can successfully send an email but i run into errors if email fields are empty. I am looking for it to overlook the empty fields and continue searching for an email address. Also i can only get it to locate a template of an active sheet but would require it to locate a template of another sheet and use that. Finally when i try adding in HTML the script successfully picks up the template but sends it as plain text and its not sent as HTML.
function sendEmails() {
var sheet = SpreadsheetApp.getActiveSheet();
var startRow = 2; // First row of data to process
var numRows = 100; // Number of rows to process
// Fetch the range of cells A2:B3
var dataRange = sheet.getRange(startRow, 1, numRows, 100)
// Fetch values for each row in the Range.
var data = dataRange.getValues();
for (i in data) {
var row = data[i];
var emailAddress = row[8]; // Eight column
var message = row[15]; // Fifteenth column
var subject = "Welcome To Phorest";
MailApp.sendEmail(emailAddress, subject, message);
}
}
Looking forward to speaking with someone that can help me work all this out and save me some data entry in the process.
Appreciated.

Answer 1

You can send an HTML-containing email the following way:
var email = "some#email.com";
var subject = "Hello!";
var html = '<p> What is your favourite fruit? </p> <br>' +
'<select>' +
'<option value="apple">Apple</option>' +
'<option value="orange">Orange</option>' +
'</select> ';
MailApp.sendEmail({
to: email,
subject: subject,
htmlBody: html
});