Todo App with umi, dva

Introduction

This is my attempt to build a simple Todo app with umi, dva.

Setup

From Scratch

A sequence of steps that I did to create this Todo app.

Install umi

1. Read [umi Getting Started guide]
2. yarn global add umi

Bootstrap Todo application

1. Create a new project directory: mkdir todo-umi-dva
2. Bootstrap umi: yarn create umi
   1. For boilerplate type: choose app
   2. For use typescript: enter y
   3. For functionality do you want to enable, select everything(antd, dva, code splitting, dll, internationalization)
3. Install dependencies: yarn install
4. Run in dev mode: umi dev
5. Visit via the browser: http://localhost:8000

Use Ant Design's CSS

1. Edit src/layouts/index.css
   1. Import antd's CSS: @import '~antd/dist/antd.css'; (From Ant Design's Use in Typescript)
   2. Delete font-family related lines to use Ant Design's default.

Use Ant Design's Layout

1. Edit src/layouts/index.tsx
   1. Import Ant components

      import { Layout, Menu, Breadcrumb } from 'antd';
      const { Header, Content, Footer } = Layout;
      

   2. Update render() to return Ant layout. Notice props.children is rendered within the Content block.

Create a Todo Model and Mock Service

1. Create Todo directory: mkdir -p src/pages/todo
2. Create a file to declare domain types: touch src/pages/todo/types.ts
   1. Create a Todo class. We'll come back to the Model file to wire up dva
3. Create a Mock file to host the mock service: touch src/pages/todo/_mock.ts
   1. Mock /api/todos service (see source)
   2. Try it out:
      1. Post new Todo: curl -XPOST -H"Content-Type: application/json" -d'{"description" : "hello"}' localhost:8000/api/todos
      2. Get Todos: curl localhost:8000/api/todos
      3. Patch Todo: curl -XPATCH -H"Content-Type: application/json" -d'{"completed": true}' localhost:8000/api/todos/0

Create a Todo Service

1. Create a Service file: touch src/pages/todo/service.ts
   1. Create TodoService, see source

Create the UI

1. Create an index.tsx file: touch src/pages/todo/index.tsx
2. Put in the basic frontend code:
3. Refresh the page to see it: http://localhost:8080/todo

Wire up DVA

This is perhaps the most complicated thing... :/

1. Create src/pages/todo/model.ts
   1. Set namespace to todos
   2. Create TodoState
   3. Initialize state as a type of TodoState
   4. Add a reducer
   5. Add effects. Each "effect" is later triggered by dispatch as type: "[namespace]/[effect name]", with payload
   6. Once an effect is completed, use yield put to trigger a reducer
2. In src/pages/todo/index.tsx
   1. Declare an Props interface to access dispatch, loading, and data from dva

      interface ViewProps extends TodoState {
        dispatch: any;
        loading: boolean;
      }
      

   2. Use decoration to connect dva to component.

      @connect(({ todos, loading }) => ({
        todos,
        loading: loading.models.todos,
      }))
      

   3. What does @connect do? See this blog, and Proper Typing of react-redux Connected Components
   4. Where does loading coming from? See dva#1464

Link & Navigation

1. In src/layouts/index.tsx
   1. Each <Menu> uses the path as key, e.g., <Menu.Item key="/">Home</Menu.Item>
   2. Use <Link> to navigate to URL, e.g., <Link to="/">Home</Link>
   3. In <Menu>, use location.pathname to select current item: <Menu ... defaultSelectedKeys={[location.pathname]}>...</Menu>

Page Title

1. Read UmiJS - Router - Extending Routing by Annotation
2. Page title can be set in the comment

   /**
    * title: Page Title
    */
   

Lint

1. Read umi-lint instructions
2. Add lint: yarn add umi-lint --dev
3. Add to package.json

   "scripts": {
     ...
     "lint:umi": "umi-lint --tslint --prettier  src/",
     "precommit:umi": "umi-lint --staged --tslint --stylelint --prettier --fix"
     ...
   }
   

4. Run: yarn lint:umi