Bot Emulator PostBack

[tdurnford]

Version

Emulator: 4.1.0
SDK: NodeJs V4.1.5

Description

In response to this StackOverflow question, I created a simple bot with the NodeJs V4 SDK that responds to a user's message with a Hero Card. The card has two action buttons: a PostBack and an ImBack Action. The first time the user clicks the PostBack action in a new conversation the emulator sends the value of the action as a message from the user; however, all subsequent times the user selects the PostBack action, it does not send the value as a message. I also deployed this bot to the WebChat channel where everything worked as expected. Consequently, I suspect this is an issue with the emulator.

Code

onTurn Function

async onTurn(turnContext) {
        if (turnContext.activity.type === ActivityTypes.Message){
            await turnContext.sendActivity(`You said '${turnContext.activity.text}'`)
             await turnContext.sendActivity({ attachments: [this.createHeroCard()] });
        } else if (turnContext.activity.type === ActivityTypes.ConversationUpdate){
            for (const idx in turnContext.activity.membersAdded){
                if (turnContext.activity.membersAdded[idx].id === turnContext.activity.recipient.id){
                    await turnContext.sendActivity(`Welcome to PostBack Bot! Say something to begin.`);
                }
            }
        }
    }

Hero Card Helper Function

createHeroCard() {
        return CardFactory.heroCard(
            'BotFramework Hero Card',
            CardFactory.images(['https://sec.ch9.ms/ch9/7ff5/e07cfef0-aa3b-40bb-9baa-7c9ef8ff7ff5/buildreactionbotframework_960.jpg']),
            CardFactory.actions([
                {
                    type: ActionTypes.PostBack,
                    title: "PostBack",
                    value: 'PostBack'
                }, 
                {
                    type: ActionTypes.ImBack,
                    title: "ImBack",
                    value: 'ImBack'
                }
            ])
        );
    }

Expected behavior

PostBack Actions are not supposed to send a visible message from the user in the emulator channel; however, one is being sent the first time a PostBack action is invoked.

Screenshots

[justinwilaby]

This is related to, or a duplicate of #1134

[vishwacsena]

@justinwilaby this does not appear to be a dupe of #1134. This is more of a behavioral issue with the PostBack card action. When emulator responds with postback, the actual message value should not be rendered on the canvas; however the message is rendered to the user the first time the button is clicked.

I have a repro set up here -

1. Clone botbuilder-samples branch
2. checkout vishwac/repro/em-1140 branch
3. cd into samples/javascript_nodejs/06.using-cards/
4. npm i & npm start
5. connect to the bot using v4 emulator
6. send 'hi' - bot responds back with a choice prompt
7. choose '3' for hero card
8. click on '[Post Back] hi'

Expected: Emulator does not show 'hi' as message sent from user
Actual: Emulator shows 'hi' as message sent from user.

Note that subsequent times you click on '[Post Back] hi' does the right thing and does not render user's message on the canvas.

[robert4os]

I am using v3.15.2.2 and I just noticed this problem. 3.15 was released 8 months ago! I wonder, how this problem went unnoticed for so long? Will there be a fix for v3 too?