创建一个空白项目

当你开始一个新项目时，你可以运行slack create命令。在本教程中，您将从头开始构建一个应用程序。所以从列表中选择“空白项目”：

$ slack create
? Select a template to build from:

  Hello World
  A simple workflow that sends a greeting

  Scaffolded project
  A solid foundational project that uses a Slack datastore

> Blank project
  A, well.. blank project

  To see all available samples, visit github.com/slack-samples.

生成项目后，让我们检查slack run命令是否正常运行。此命令将新应用程序的“开发”版本安装到连接的 Slack 工作区中。现在您的应用程序的机器人用户位于工作区中，并且您的应用程序具有用于 API 调用的机器人令牌。

$ cd sharp-chipmunk-480
$ slack run
? Choose a workspace  seratch  T03E94MJU
   App is not installed to this workspace

Updating dev app install for workspace "Acme Corp"

⚠️  Outgoing domains
   No allowed outgoing domains are configured
   If your function makes network requests, you will need to allow the outgoing domains
   Learn more about upcoming changes to outgoing domains: https://api.slack.com/future/changelog
✨  seratch of Acme Corp
Connected, awaiting events

如果您看到Connected, awaiting events日志消息，则应用已成功连接到 Slack。您可以按“Ctrl + C”来终止本地应用程序进程。

定义工作流和触发器

让我们从定义一个简单的演示工作流及其链接触发器开始。一如既往，将源代码保存为workflow_and_trigger.ts：

// ----------------
// Workflow Definition
// ----------------
import { DefineWorkflow, Schema } from "deno-slack-sdk/mod.ts";
export const workflow = DefineWorkflow({
  callback_id: "modal-demo-workflow",
  title: "Modal Demo Workflow",
  input_parameters: {
    properties: { interactivity: { type: Schema.slack.types.interactivity } },
    required: ["interactivity"],
  },
});

// Add your custom function to open and handle a modal
import { def as ModalDemo } from "./function.ts";
workflow.addStep(ModalDemo, {
  interactivity: workflow.inputs.interactivity,
});

// ----------------
// Trigger Definition
// ----------------
import { Trigger } from "deno-slack-api/types.ts";
const trigger: Trigger<typeof workflow.definition> = {
  type: "shortcut", // link trigger
  name: "Modal Demo Trigger",
  workflow: `#/workflows/${workflow.definition.callback_id}`,
  inputs: {
    // Modal interactions require `interactivity` input parameter.
    // As of this writing, only link triggers can provide the value.
    interactivity: { value: "{{data.interactivity}}" },
  },
};
export default trigger;

由于您还function.ts没有，编译应该会失败。让我们添加以下源代码function.ts：

import { DefineFunction, Schema, SlackFunction } from "deno-slack-sdk/mod.ts";
import { FunctionSourceFile } from "https://deno.land/x/deno_slack_source_file_resolver@0.1.5/mod.ts";

export const def = DefineFunction({
  callback_id: "modal-example",
  title: "Modal interaction example",
  source_file: FunctionSourceFile(import.meta.url),
  input_parameters: {
    properties: { interactivity: { type: Schema.slack.types.interactivity } },
    required: ["interactivity"],
  },
  output_parameters: { properties: {}, required: [] },
});

export default SlackFunction(
  def,
  // ---------------------------
  // The first handler function that opens a modal.
  // This function can be called when the workflow executes the function step.
  // ---------------------------
  async ({ inputs, client }) => {
    // Open a new modal with the end-user who interacted with the link trigger
    const response = await client.views.open({
      interactivity_pointer: inputs.interactivity.interactivity_pointer,
      view: {
        "type": "modal",
        // Note that this ID can be used for dispatching view submissions and view closed events.
        "callback_id": "first-page",
        // This option is required to be notified when this modal is closed by the user
        "notify_on_close": true,
        "title": { "type": "plain_text", "text": "My App" },
        "submit": { "type": "plain_text", "text": "Next" },
        "close": { "type": "plain_text", "text": "Close" },
        "blocks": [
          {
            "type": "input",
            "block_id": "first_text",
            "element": { "type": "plain_text_input", "action_id": "action" },
            "label": { "type": "plain_text", "text": "First" },
          },
        ],
      },
    });
    if (response.error) {
      const error =
        `Failed to open a modal in the demo workflow. Contact the app maintainers with the following information - (error: ${response.error})`;
      return { error };
    }
    return {
      // To continue with this interaction, return false for the completion
      completed: false,
    };
  },
)
  // ---------------------------
  // The handler that can be called when the above modal data is submitted.
  // It saves the inputs from the first page as private_metadata,
  // and then displays the second-page modal view.
  // ---------------------------
  .addViewSubmissionHandler(["first-page"], ({ view }) => {
    // Extract the input values from the view data
    const firstText = view.state.values.first_text.action.value;
    // Input validations
    if (firstText.length < 5) {
      return {
        response_action: "errors",
        // The key must be a valid block_id in the blocks on a modal
        errors: { first_text: "Must be 5 characters or longer" },
      };
    }
    // Successful. Update the modal with the second page presentation
    return {
      response_action: "update",
      view: {
        "type": "modal",
        "callback_id": "second-page",
        // This option is required to be notified when this modal is closed by the user
        "notify_on_close": true,
        "title": { "type": "plain_text", "text": "My App" },
        "submit": { "type": "plain_text", "text": "Next" },
        "close": { "type": "plain_text", "text": "Close" },
        // Hidden string data, which is not visible to end-users
        // You can use this property to transfer the state of interaction
        // to the following event handlers.
        // (Up to 3,000 characters allowed)
        "private_metadata": JSON.stringify({ firstText }),
        "blocks": [
          // Display the inputs from "first-page" modal view
          {
            "type": "section",
            "text": { "type": "mrkdwn", "text": `First: ${firstText}` },
          },
          // New input block to receive text
          {
            "type": "input",
            "block_id": "second_text",
            "element": { "type": "plain_text_input", "action_id": "action" },
            "label": { "type": "plain_text", "text": "Second" },
          },
        ],
      },
    };
  })
  // ---------------------------
  // The handler that can be called when the second modal data is submitted.
  // It displays the completion page view with the inputs from
  // the first and second pages.
  // ---------------------------
  .addViewSubmissionHandler(["second-page"], ({ view }) => {
    // Extract the first-page inputs from private_metadata
    const { firstText } = JSON.parse(view.private_metadata!);
    // Extract the second-page inputs from the view data
    const secondText = view.state.values.second_text.action.value;
    // Displays the third page, which tells the completion of the interaction
    return {
      response_action: "update",
      view: {
        "type": "modal",
        "callback_id": "completion",
        // This option is required to be notified when this modal is closed by the user
        "notify_on_close": true,
        "title": { "type": "plain_text", "text": "My App" },
        // This modal no longer accepts further inputs.
        // So, the "Submit" button is intentionally removed from the view.
        "close": { "type": "plain_text", "text": "Close" },
        // Display the two inputs
        "blocks": [
          {
            "type": "section",
            "text": { "type": "mrkdwn", "text": `First: ${firstText}` },
          },
          {
            "type": "section",
            "text": { "type": "mrkdwn", "text": `Second: ${secondText}` },
          },
        ],
      },
    };
  })
  // ---------------------------
  // The handler that can be called when the second modal data is closed.
  // If your app runs some resource-intensive operations on the backend side,
  // you can cancel the ongoing process and/or tell the end-user
  // what to do next in DM and so on.
  // ---------------------------
  .addViewClosedHandler(
    ["first-page", "second-page", "completion"],
    ({ view }) => {
      console.log(`view_closed handler called: ${JSON.stringify(view)}`);
      return { completed: true };
    },
  );

稍后我会解释细节，但关键点是：

• 第一个处理程序为最终用户打开一个模式
• addViewSubmissionHandler()使用处理程序注册 + 模态的调度模态数据提交事件callback_id
• addViewClosedHandler()使用的处理程序注册 + 模态的调度模态关闭事件

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