Add Item To Gmail Message Menu

[Daniel Davis]

Is it possible to add a menu item to an  email message using Apps Scripts?  I'd like to add an item like to this menu:




I used the cat email quickstart and tried modifying it to draw that menu item on an email message but I have not been able to get it to work yet.

Here is the quickstart I'm talking about:
https://developers.google.com/apps-script/add-ons/cats-quickstart

The quickstart does show how to add a menu item to the compose email screen, but I can't see how to get this to work for an inbox email.  

when composing an email the menu item is added using appsscript.json like this:

"composeTrigger": {
        "selectActions": [{
          "text": "Insert cat",
          "runFunction": "onGmailCompose"
        }],
        "draftAccess": "NONE"
      }

Is there some trigger that I can use for when an email is opened?  I have not found one.  I also tried creating the button inside the onGmailMessage function that is triggered by:

"gmail": {
      "contextualTriggers": [{
        "unconditional": {
        },
        "onTriggerFunction": "onGmailMessage"
      }],

here is my onGmailMessage function:
function  onGmailMessage   (e) {
    // Activate temporary Gmail scopes, in this case to allow
    // message metadata to be read.
    var accessToken = e.gmail.accessToken;
    GmailApp.setCurrentMessageAccessToken(accessToken);

    var messageId = e.gmail.messageId;
    var message = GmailApp.getMessageById(messageId);
    var subject = message.getSubject();
    var sender = message.getFrom();

    // Create a card with a single card section and two widgets.
    // Be sure to execute build() to finalize the card construction.
    var exampleCard = CardService.newCardBuilder()
        .setHeader(CardService.newCardHeader()
            .setTitle('Example card'))
        .addSection(CardService.newCardSection()
            .addWidget(CardService.newKeyValue()
                .setTopLabel('Subject')
                .setContent(subject))
            .addWidget(CardService.newKeyValue()
                .setTopLabel('From')
                .setContent(sender)))
        .build();   // Don't forget to build the Card!
    return [exampleCard];
  }
 

I don't see anything when I open an email.  Where is that card supposed to be displayed?

[Jonathan Butler]

There should be a small arrow in the bottom right of the screen that reveals a sidebar. 

That sidebar should contain your gmail application.

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