Customize invitation email in Google Forms - google-apps-script

Question

I want to custom the invitation email when I share a google form. I have looking up in Google Script documentation and I haven't found some method or class useful. How can I customize this invitation email?.
Normally this email looks like:
I want to add a corporative image in the footer and maybe some text.

Answer 1

There isn't a method to create your own customized message. Below I am going to propose an alternate solution.
You can create a function that sends a customized mail. Just create an HTML file with your customized HTML content.
// i called this share.html in the apps script project
<h1>This is a header 1</h1>
<p>This is a paragraph</p>
<img src="<<SOME IMAGE SRC HERE>>" />
Then back in your code.gs file create a function like below:
function shareForm() {
var html = HtmlService.createHtmlOutputFromFile('share').getContent();
var recipient = '<<EMAIL ADDRESS>>';
var subject = 'this is the subject';
var body = 'this will get overridden by the HTML service';
var options = {
htmlBody: html
};
MailApp.sendEmail(recipient, subject, body, options)
}
You can run this function from the script editor, or you can build a button to add into the add-ons drop down options.