send_message

Sends a message to a specific channel. The message input only supports non-interactive rich_text.

This function returns a timestamp of the new message, which also serves as a confirmation that the message was sent.

Adding interactivity with buttons

The interactive_blocks input only supports the button and workflow_button interactive blocks.

Ensure that you do not use non-interactive elements via the interactive_blocks input, as this could cause unintended behavior.

If you include a button in the message, the function execution will not continue until a user clicks on that button.

Example

To collect a formatted message from your end users and send it as-is, you can use a form to collect the formatted text, and a Slack function to send it:

import { DefineWorkflow, Schema } from "deno-slack-sdk/mod.ts";

export const RichTextWorkflow = DefineWorkflow({
  callback_id: "rich_text_workflow",
  title: "rich-text input workflow",
  input_parameters: {
    properties: {
      interactivity: { type: Schema.slack.types.interactivity },
      channel: { type: Schema.slack.types.channel_id },
    },
    required: ["interactivity", "channel"],
  },
});

const inputForm = RichTextWorkflow.addStep(
  Schema.slack.functions.OpenForm,
  {
    title: "Send formatted message",
    interactivity: RichTextWorkflow.inputs.interactivity,
    submit_label: "Send formatted message",
    fields: {
      elements: [
        {
          name: "formattedInput",
          title: "Formatted input",
          type: Schema.slack.types.rich_text,
        },
        {
          name: "channel",
          title: "Post in:",
          type: Schema.slack.types.channel_id,
          default: RichTextWorkflow.inputs.channel,
        },
      ],
      required: ["channel", "formattedInput"],
    },
  },
);

RichTextWorkflow.addStep(Schema.slack.functions.SendMessage, {
  channel_id: inputForm.outputs.fields.channel,
  message: inputForm.outputs.fields.formattedInput,
  interactive_blocks: [{
    "type": "actions",
    "elements": [
      {
        "type": "button",
        "text": { "type": "plain_text", "text": "Approve" },
        "style": "primary",
        "value": "approve",
        "action_id": "approve_button",
      },
    ],
  }],
});

Here's an example with just regular text:

import { DefineWorkflow, Schema } from "deno-slack-sdk/mod.ts";

export const createAnnouncement = DefineWorkflow({
  callback_id: "create-announcement",
  title: "Workflow for creating announcements",
  input_parameters: { properties: {}, required: [] },
});

const sendPreview = createAnnouncement.addStep(
  Schema.slack.functions.SendMessage,
  {
    channel_id: "CTLC2K3JS",
    message: "Good to see you here!",
  },
);

Action payload

Example action payload:

{
  "action_id": "WaXA",
  "block_id": "=qXel",
  "text": {
    "type": "plain_text",
    "text": "View",
    "emoji": true
  },
  "value": "click_me_123",
  "type": "button",
  "action_ts": "1548426417.840180"
}