Data

Tools

Indexes

Applications

Experiments

Awesome

An open API service indexing awesome lists of open source software.

https://github.com/universal-model/universal-model-react

Universal Model for React
https://github.com/universal-model/universal-model-react

model mvc react universal universal-model

Last synced: about 2 months ago
JSON representation

Universal Model for React

Awesome Lists containing this project

README 

        
# Universal Model for React



[![version][version-badge]][package]

[![Downloads][Downloads]][package]

[![build][build]][circleci]

[![coverage][coverage]][codecov]

[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=universal-model_universal-model-react&metric=alert_status)](https://sonarcloud.io/dashboard?id=universal-model_universal-model-react)

[![MIT License][license-badge]][license]

[![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2Funiversal-model%2Funiversal-model-react.svg?type=shield)](https://app.fossa.com/projects/git%2Bgithub.com%2Funiversal-model%2Funiversal-model-react?ref=badge_shield)



Universal model is a model which can be used with any of following UI frameworks:



- Angular 2+ [universal-model-angular]

- React 16.8+

- Svelte 3+ [universal-model-svelte]

- Vue.js 3+ [universal-model-vue]



If you want to use multiple UI frameworks at the same time, you can use single model

with [universal-model] library



## Install



    npm install --save universal-model-react



## Prerequisites for universal-model-react



    "react": "^16.8.0"



## Clean UI Architecture



![alt text](https://github.com/universal-model/universal-model-vue/raw/master/images/mvc.png 'MVC')



- Model-View-Controller (https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller)

- User triggers actions by using view or controller

- Actions are part of model and they manipulate state that is stored

- Actions can use services to interact with external (backend) systems

- State changes trigger view updates

- Selectors select and calculate a transformed version of state that causes view updates

- Views contain NO business logic

- There can be multiple interchangeable views that use same part of model

- A new view can be created to represent model differently without any changes to model

- View technology can be changed without changes to the model



## Clean UI Code directory layout

UI application is divided into UI components. Common UI components should be put into common directory. Each component

can consist of subcomponents. Each component has a view and optionally controller and model. Model consists of actions, state

and selectors. In large scale apps, model can contain sub-store. Application has one store which is composed of each components'

state (or sub-stores)



    - src

      |

      |- common

      |  |- component1

      |  |- component2

      |  . |- component2_1

      |  . 

      |  . 

      |  .

      |- componentA

      |- componentB

      |  |- componentB_1

      |  |- componentB_2

      |- componentC

      |  |- view

      |  .

      |  .

      |- componentN

      |  |- controller

      |  |- model

      |  |  |- actions

      |  |  |- services

      |  |  |- state

      |  |- view

      |- store



## API



### Common API (Angular/React/Svelte/Vue)

```ts

createSubState(subState);

const store = createStore(initialState, combineSelectors(selectors))



const { componentAState } = store.getState();

const { selector1, selector2 } = store.getSelectors();

const [{ componentAState }, { selector1, selector2 }] = store.getStateAndSelectors();

```

    

### React specifi API

```ts

useState([componentAState]);

useSelectors([selector1, selector2]);

useStateAndSelectors([componentAState], [selector1, selector2]);

```   

[Detailed API documentation](https://github.com/universal-model/universal-model-react/blob/master/docs/API.md)



## API Examples

**Create initial states**

```ts

const initialComponentAState = {

  prop1: 0,

  prop2: 0

};

```

    

**Create selectors**



When using foreign state inside selectors, prefer creating foreign state selectors and accessing foreign

state through them instead of directly accessing foreign state inside selector. This will ensure  better

encapsulation of component state. For example:



```ts

const createComponentASelectors = () => ({

  selector1: (state: State) => state.componentAState.prop1  + state.componentAState.prop2

  selector2: (state: State) => {

    const { componentBSelector1, componentBSelector2 } = createComponentBSelectors();

    return state.componentAState.prop1 + componentBSelector1(state) + componentBSelector2(state);

  }

});

```



**Create and export store in store.ts:**



combineSelectors() checks if there are duplicate keys in selectors and will throw an error telling which key was duplicated.

By using combineSelectors you can keep your selector names short and only namespace them if needed.



```ts

const initialState = {

  componentAState: createSubState(initialComponentAState),

  componentBState: createSubState(initialComponentBState)

};



export type State = typeof initialState;



const componentAStateSelectors = createComponentAStateSelectors();

const componentBStateSelectors = createComponentBStateSelectors();



const selectors = combineSelectors(

  componentAStateSelectors,

  componentBStateSelectors

);



export default createStore(initialState, selectors);

```

    

in large projects you should have sub-stores for components and these sub-store are combined 

together to a single store in store.js:



**componentBSubStore.js**



```ts

const initialComponentsBState = { 

  componentBState: createSubState(initialComponentBState),

  componentB_1State: createSubState(initialComponentB_1State),

  componentB_2State: createSubState(initialComponentB_2State) 

};



const componentBStateSelectors = createComponentBStateSelectors();

const componentB_1StateSelectors = createComponentB_1StateSelectors();

 const componentB_2StateSelectors = createComponentB_2StateSelectors();



const componentsBSelectors = combineSelectors(

  componentBStateSelectors,

  componentB_1StateSelectors,

  componentB_2StateSelectors

);

```

    

**store.js**



```ts

const initialState = {

  ...initialComponentsAState,

  ...intialComponentsBState,

  .

  ...initialComponentsNState

};

      

export type State = typeof initialState;

    

const selectors = combineSelectors(

  componentsAStateSelectors,

  componentsBStateSelectors,

  .

  componentsNStateSelectors

);

    

export default createStore(initialState, selectors);

```



**Access store in Actions**



Don't modify other component's state directly inside action, but instead 

call other component's action. This will ensure encapsulation of component's own state.



```ts

export default function changeComponentAAndBState(newAValue, newBValue) {

  const { componentAState } = store.getState();

  componentAState.prop1 = newAValue;

  

  // BAD

  const { componentBState } = store.getState();

  componentBState.prop1 = newBValue;

  

  // GOOD

  changeComponentBState(newBValue);

}

```



**Use actions, state and selectors in Views (React functional components)**



Class-based components are not currently supported.



Components should use only their own state and access other components' states using selectors

provided by those components. This will ensure encapsulation of each component's state. For example:

 

```ts   

const View = () => {

  const [{ componentAState }, { selector1, selector2 }] = store.getStateAndSelectors();

  store.useStateAndSelectors([componentAState], [selector1, selector2]);

  

  // NOTE! Get the value of a selector using it's 'value' property!

  console.log(selector1.value);

}

```



It is also possible to access foreign state directly using a state getter function:



```ts

const View = () => {

  const [{ componentAState, componentBState }, { selector1 }] = store.getStateAndSelectors();

  store.useStateAndSelectors([componentAState, () => componentBState.property1], [selector1]);

  

  console.log(componentBState.property1);

}

```



# Example



## View

App.tsx



```tsx

import * as React from 'react';

import HeaderView from '@/header/view/HeaderView';

import TodoListView from '@/todolist/view/TodoListView';



const App = () => (

  


    

    

  


);



export default App;

```

    

HeaderView.tsx



```tsx

import * as React from 'react';

import store from '@/store/store';

import changeUserName from '@/header/model/actions/changeUserName';



const HeaderView = () => {

  const { headerText } = store.getSelectors();

  store.useSelectors([headerText]);



  return (

    


      
{headerText.value}


      User name:

       changeUserName(value)} />

    


  );

};



export default HeaderView;

```



TodoListView.tsx



```tsx

import * as React from 'react';

import { useEffect } from 'react';

import store from '@/store/store';

import { Todo } from '@/todolist/model/state/initialTodoListState';

import removeTodo from '@/todolist/model/actions/removeTodo';

import fetchTodos from '@/todolist/model/actions/fetchTodos';

import todoListController from '@/todolist/controller/todoListController';

import toggleIsDoneTodo from '@/todolist/model/actions/toggleIsDoneTodo';

import toggleShouldShowOnlyUnDoneTodos from '@/todolist/model/actions/toggleShouldShowOnlyUnDoneTodos';



const TodoListView = () => {

  const [{ todosState }, { shownTodos, userName }] = store.getStateAndSelectors();

  store.useStateAndSelectors([todosState], [shownTodos, userName]);



  useEffect(() => {

    // noinspection JSIgnoredPromiseFromCall

    fetchTodos();

    document.addEventListener('keydown', todoListController.handleKeyDown);

    return () => document.removeEventListener('keydown', todoListController.handleKeyDown);

  }, []);



  let todoListContent;



  if (todosState.isFetchingTodos) {

    todoListContent = 
Fetching todos...
;

  } else if (todosState.hasTodosFetchFailure) {

    todoListContent = 
Failed to fetch todos
;

  } else {

    const todoListItems = shownTodos.value.map((todo: Todo, index: number) => (

      
  • 

             toggleIsDoneTodo(todo)}

            />

            {userName.value}: {todo.name}

             removeTodo(todo)}>Remove

          
    • 

        ));
    


        todoListContent = 
      {todoListItems}
    ;

      }
    


      return (

        
    

          

          Show only undone todos

          {todoListContent}

        
    

      );

    };
    


    export default TodoListView;

    ```
    


    ## Controller
    


    todoListController.ts
    


    ```ts

    import addTodo from "@/todolist/model/actions/addTodo";

    import removeAllTodos from "@/todolist/model/actions/removeAllTodos";
    


    export default {

      handleKeyDown(keyboardEvent: KeyboardEvent): void {

        if (keyboardEvent.code === 'KeyA' && keyboardEvent.ctrlKey) {

          keyboardEvent.stopPropagation();

          keyboardEvent.preventDefault();

          addTodo();

        } else if (keyboardEvent.code === 'KeyR' && keyboardEvent.ctrlKey) {

           keyboardEvent.stopPropagation();

           keyboardEvent.preventDefault();

          removeAllTodos();

        }

      }

    };

    ```

        

    ## Model
    


    ### Store
    


    store.ts
    


    ```ts

    import { combineSelectors, createStore, createSubState } from 'universal-model-react';

    import initialHeaderState from '@/header/model/state/initialHeaderState';

    import initialTodoListState from '@/todolist/model/state/initialTodoListState';

    import createTodoListStateSelectors from '@/todolist/model/state/createTodoListStateSelectors';

    import createHeaderStateSelectors from '@/header/model/state/createHeaderStateSelectors';
    


    const initialState = {

      headerState: createSubState(initialHeaderState),

      todosState: createSubState(initialTodoListState)

    };
    


    export type State = typeof initialState;
    


    const headerStateSelectors =  createHeaderStateSelectors();

    const todoListStateSelectors = createTodoListStateSelectors();
    


    const selectors = combineSelectors(

     headerStateSelectors,

     todoListStateSelectors 

    );
    


    export default createStore(initialState, selectors);

    ```
    


    ### State
    


    #### Initial state

    initialHeaderState.ts
    


    ```ts

    export default {

      userName: 'John'

    };

    ```
    


    initialTodoListState.ts
    


    ```ts

    export interface Todo {

      id: number,

      name: string;

      isDone: boolean;

    }
    


    export default {

      todos: [] as Todo[],

      shouldShowOnlyUnDoneTodos: false,

      isFetchingTodos: false,

      hasTodosFetchFailure: false

    };

    ```
    


    #### State selectors
    


    createHeaderStateStateSelectors.ts
    


    ```ts

    import { State } from '@/store/store';
    


    const createHeaderStateSelectors = () => ({

      userName: (state: T) => state.headerState.userName,

      headerText: (state: T) => {

        const {

          todoCount: selectTodoCount,

          unDoneTodoCount: selectUnDoneTodoCount

        } = createTodoListStateSelectors();

      

        return `${state.headerState.userName} (${selectUnDoneTodoCount(state)}/${selectTodoCount(state)})`;

      }

    });
    


    export default createHeaderStateSelectors;

    ```
    


    createTodoListStateSelectors.ts
    


    ```ts

    import { State } from '@/store/store';

    import { Todo } from '@/todolist/model/state/initialTodoListState';
    


    const createTodoListStateSelectors = () => ({

      shownTodos: (state: T) =>

        state.todosState.todos.filter(

          (todo: Todo) =>

            (state.todosState.shouldShowOnlyUnDoneTodos && !todo.isDone) ||

            !state.todosState.shouldShowOnlyUnDoneTodos

        ),

       todoCount: (state: T) => state.todosState.todos.length,

       unDoneTodoCount: (state: T) => state.todosState.todos.filter((todo: Todo) => !todo.isDone).length

    });
    


    export default createTodoListStateSelectors;

    ```
    


    ### Service
    


    ITodoService.ts
    


    ```ts

    import { Todo } from '@/todolist/model/state/initialTodoListState';
    


    export interface ITodoService {

      tryFetchTodos(): Promise;

    }

    ```
    


    FakeTodoService.ts
    


    ```ts

    import { ITodoService } from '@/todolist/model/service/ITodoService';

    import { Todo } from '@/todolist/model/state/initialTodoListState';

    import Constants from '@/Constants';
    


    export default class FakeTodoService implements ITodoService {

      tryFetchTodos(): Promise {

        return new Promise((resolve: (todo: Todo[]) => void, reject: () => void) => {

          setTimeout(() => {

            if (Math.random() < 0.95) {

              resolve([

                { id: 1, name: 'first todo', isDone: true },

                { id: 2, name: 'second todo', isDone: false }

              ]);

            } else {

              reject();

            }

          }, Constants.FAKE_SERVICE_LATENCY_IN_MILLIS);

        });

      }

    }

    ```
    


    todoService.ts
    


    ```ts

    import FakeTodoService from "@/todolist/model/services/FakeTodoService";
    


    export default new FakeTodoService();

    ```
    


    ### Actions
    


    changeUserName.ts
    


    ```ts

    import store from '@/store/store';
    


    export default function changeUserName(newUserName: string): void {

      const { headerState } = store.getState();

      headerState.userName = newUserName;

    }

    ```
    


    addTodo.ts
    


    ```ts

    import store from '@/store/store';
    


    let id = 3;
    


    export default function addTodo(): void {

      const { todosState } = store.getState();

      todosState.todos.push({ id, name: 'new todo', isDone: false });

      id++;

    }

    ```
    


    removeTodo.ts
    


    ```ts

    import store from '@/store/store';

    import { Todo } from '@/todolist/model/state/initialTodoListState';
    


    export default function removeTodo(todoToRemove: Todo): void {

      const { todosState } = store.getState();

      todosState.todos = todosState.todos.filter((todo: Todo) => todo !== todoToRemove);

    }

    ```
    


    removeAllTodos.ts
    


    ```ts

    import store from '@/store/store';
    


    export default function removeAllTodos(): void {

      const { todosState } = store.getState();

      todosState.todos = [];

    }

    ```
    


    toggleIsDoneTodo.ts
    


    ```ts

    import { Todo } from '@/todolist/model/state/initialTodoListState';
    


    export default function toggleIsDoneTodo(todo: Todo): void {

      todo.isDone = !todo.isDone;

    }

    ```
    


    toggleShouldShowOnlyUnDoneTodos.ts
    


    ```ts

    import store from '@/store/store';
    


    export default function toggleShouldShowOnlyUnDoneTodos(): void {

      const { todosState } = store.getState();

      todosState.shouldShowOnlyUnDoneTodos = !todosState.shouldShowOnlyUnDoneTodos;

    }

    ```
    


    fetchTodos.ts
    


    ```ts

    import store from '@/store/store';

    import todoService from '@/todolist/model/services/todoService';
    


    export default async function fetchTodos(): Promise {

      const { todosState } = store.getState();
    


      todosState.isFetchingTodos = true;

      todosState.hasTodosFetchFailure = false;
    


      try {

        todosState.todos = await todoService.tryFetchTodos();

      } catch (error) {

        todosState.hasTodosFetchFailure = true;

      }
    


      todosState.isFetchingTodos = false;

    }

    ```
    


    ### Full Examples
    


    https://github.com/universal-model/universal-model-react-todo-app
    


    https://github.com/universal-model/universal-model-react-todos-and-notes-app
    


    ### Dependency injection

    If you would like to use dependency injection (noicejs) in your app, check out this [example],

    where DI is used to create services.
    


    ### Donate/Sponsor

    If you would like to help me to develop more great stuff, you can [donate](https://paypal.me/pksilen) or [sponsor](https://patreon.com/pksilen). Thank you!
    


    ### License
    


    MIT License
    


    [license-badge]: https://img.shields.io/badge/license-MIT-green

    [license]: https://github.com/universal-model/universal-model-react/blob/master/LICENSE

    [version-badge]: https://img.shields.io/npm/v/universal-model-react.svg?style=flat-square

    [package]: https://www.npmjs.com/package/universal-model-react

    [Downloads]: https://img.shields.io/npm/dm/universal-model-react

    [build]: https://img.shields.io/circleci/project/github/universal-model/universal-model-react/master.svg?style=flat-square

    [circleci]: https://circleci.com/gh/universal-model/universal-model-react/tree/master

    [example]: https://github.com/universal-model/react-todo-app-with-dependency-injection

    [universal-model]: https://github.com/universal-model/universal-model

    [universal-model-angular]: https://github.com/universal-model/universal-model-angular

    [universal-model-svelte]: https://github.com/universal-model/universal-model-svelte

    [universal-model-vue]: https://github.com/universal-model/universal-model-vue

    [coverage]: https://img.shields.io/codecov/c/github/universal-model/universal-model-react/master.svg?style=flat-square

    [codecov]: https://codecov.io/gh/universal-model/universal-model-react