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92
step2-07/demo/README.md
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@@ -1,88 +1,48 @@
# Step 2.7: Connect Redux store to view (Demo)
# Step 2.7: Service calls (Demo)
[Lessons](../) | [Exercise](./exercise/) | [Demo](./demo/)
[Lessons](../)
Redux is currently the most popular Flux implementation, and the ecosystem of related libraries has grown as a result. This is one of the reasons why it is a very popular library within Microsoft products.
> Note: this step doesn't work with the live site on github.io. Clone the repo to try this step out.
Various GitHub users have collected "awesome lists" of tech and articles related to Redux. Here is [one such list](https://github.com/xgrommx/awesome-redux#react---a-javascript-library-for-building-user-interfaces), but it is literally impossible to list out all the related tech.
## `redux-thunk`: side effects inside action creators
In this step, we introduce but one useful library that works with Redux: [`react-redux`](https://react-redux.js.org/).
The [Redux Thunk](https://github.com/reduxjs/redux-thunk) middleware allows writing actions that make service calls.
## The official React Redux binding: `react-redux`
Remember those simple little action functions? They're called action creators. These little functions can be charged with superpowers to allow asynchronous side effects to happen while creating the messages. Asynchronous side effects include service calls against APIs.
That's right, Redux doesn't just work with React. It can also be used with Vue.js, Angular, and React Native, to name a few.
Action creators are a natural place to put service calls. Redux Thunk middleware passes `dispatch()` and `getState()` from the store into the action creators. This allows the action creator itself to dispatch different actions in between async side effects. Combined with the async / await syntax, coding service calls is a cinch!
### `<Provider>` component
Most of the time, in a single-page app, we apply **optimistic UI updates**. We can update the UI before the network call completes so the UI feels more responsive.
The store doesn't magically get passed to the views. It has to be supplied by a `react-redux` component called [`<Provider>`](https://react-redux.js.org/api/provider). A `<Provider>` can be placed anywhere, but it's best to just make it available at the root the app:
## Action creator with a thunk
```js
const store = createStore(reducers);
[What's a thunk?](https://daveceddia.com/what-is-a-thunk/) - it is a wrapper function that returns a function. What does it do? Let's find out!
const App = () => {
return (
<Provider store={store}>
<div>Hello World!</div>
</Provider>
);
};
```
### `connect()` higher-order function
`react-redux` provides a [`connect()`](https://react-redux.js.org/api/connect) function that turns the Redux store and dispatch functions into props for React components. The state and action dispatchers are passed along with a `<Provider>` component.
```js
const OldComponent = props => {
return <div>{props.foo}</div>;
};
const NewComponent = connect(
mapStateToProps,
mapDispatchToProps,
mergeProps,
options
)(OldComponent);
```
`connect()` takes in a few functions that map portions of the state tree and dispatcher functions into props. It is a **higher-order function**, meaning that the return value of `connect()` is a function that decorates `OldComponent` into a `NewComponent` with all the mapped props.
Next we'll learn about how to write `mapStateToProps` and `mapDispatchToProps`. For demonstration purposes, we'll assume the store and the component props look like this:
This action creator just returns an object:
```ts
interface Store {
foo: string;
// and probably some other properties
}
interface ComponentProps {
foo: string;
addTodo: (label: string) => void;
function addTodo(label: string) {
return { type: 'addTodo', id: uuid(), label };
}
```
#### `mapStateToProps`
A [`mapStateToProps`](https://react-redux.js.org/api/connect#mapstatetoprops-state-ownprops-object) function uses the state tree as a parameter and selects portions of it that will be passed to the component as part of `props`. When values in the state tree change, the `mapStateToProps` function is called, and the new props are passed to the component (causing React to re-render it).
In order for us to make service calls, we need to supercharge this with the power of `redux-thunk`
```ts
function mapStateToProps(state: Store): Partial<ComponentProps> {
return {
foo: state.foo
function addTodo(label: string) {
return async (dispatch: any, getState: () => Store) => {
const addAction = actions.addTodo(label);
const id = addAction.id;
dispatch(addAction);
await service.add(id, getState().todos[id]);
};
}
```
#### `mapDispatchToProps`
Let's make some observations:
A [`mapDispatchToProps`](https://react-redux.js.org/api/connect#mapdispatchtoprops-object-dispatch-ownprops-object) function generates props which are used to dispatch Redux actions. This function generally returns props which the component will use as callbacks in response to user actions.
```ts
function mapDispatchToProps(dispatch: any): Partial<ComponentProps> {
return {
// the dispatched message COULD be generated by an
// action creator instead (see later steps)
addTodo: (label: string) => dispatch({ type: 'addTodo', label })
}
}
```
1. The outer function has the same function signature as the previous one
2. It returns a function that has `dispatch` and `getState` as parameters
3. The inner function is `async` enabled, and can await on "side effects" like asynchronous service calls
4. This inner function has the ability to dispatch additional actions because it has been passed the `dispatch()` function from the store
5. This inner function also has access to the state tree via `getState()`

45
step2-07/demo/src/actions/index.ts
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@@ -1,8 +1,51 @@
import uuid from 'uuid/v4';
import { Store } from '../store';
import * as service from '../service';
export const actions = {
addTodo: (label: string) => ({ type: 'addTodo', id: uuid(), label }),
remove: (id: string) => ({ type: 'remove', id }),
complete: (id: string) => ({ type: 'complete', id }),
clear: () => ({ type: 'clear' })
clear: () => ({ type: 'clear' }),
setFilter: (filter: string) => ({ type: 'setFilter', filter }),
edit: (id: string, label: string) => ({ type: 'edit', id, label })
};
export const actionsWithService = {
addTodo: (label: string) => {
return async (dispatch: any, getState: () => Store) => {
const addAction = actions.addTodo(label);
const id = addAction.id;
dispatch(addAction);
await service.add(id, getState().todos[id]);
};
},
remove: (id: string) => {
return async (dispatch: any, getState: () => Store) => {
dispatch(actions.remove(id));
await service.remove(id);
};
},
complete: (id: string) => {
return async (dispatch: any, getState: () => Store) => {
dispatch(actions.complete(id));
await service.update(id, getState().todos[id]);
};
},
clear: () => {
return async (dispatch: any, getState: () => Store) => {
dispatch(actions.clear());
await service.updateAll(getState().todos);
};
},
edit: (id: string, label: string) => {
return async (dispatch: any, getState: () => Store) => {
dispatch(actions.complete(id));
await service.update(id, getState().todos[id]);
};
}
};

23
step2-07/demo/src/components/TodoApp.tsx
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@@ -1,26 +1,17 @@
import React from 'react';
import { Stack, Customizer, mergeStyles, getTheme } from 'office-ui-fabric-react';
import { Stack } from 'office-ui-fabric-react';
import { TodoFooter } from './TodoFooter';
import { TodoHeader } from './TodoHeader';
import { TodoList } from './TodoList';
import { Store } from '../store';
import { FluentCustomizations } from '@uifabric/fluent-theme';
const className = mergeStyles({
padding: 25,
...getTheme().effects.elevation4
});
export const TodoApp = () => {
return (
<Customizer {...FluentCustomizations}>
<Stack horizontalAlign="center">
<Stack style={{ width: 400 }} gap={25} className={className}>
<TodoHeader />
<TodoList />
<TodoFooter />
</Stack>
<Stack horizontalAlign="center">
<Stack style={{ width: 400 }} gap={25}>
<TodoHeader />
<TodoList />
<TodoFooter />
</Stack>
</Customizer>
</Stack>
);
};

37
step2-07/demo/src/components/TodoFooter.tsx
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@@ -1,41 +1,20 @@
import React from 'react';
import { Store } from '../store';
import { Stack, Text, DefaultButton } from 'office-ui-fabric-react';
import { connect } from 'react-redux';
import { actions } from '../actions';
import { DefaultButton, Stack, Text } from 'office-ui-fabric-react';
import { actionsWithService } from '../actions';
import { useMappedState, useDispatch } from 'redux-react-hook';
interface TodoFooterProps {
clear: () => void;
todos: Store['todos'];
}
export const TodoFooter = () => {
const { todos } = useMappedState(state => state);
const dispatch = useDispatch();
const TodoFooter = (props: TodoFooterProps) => {
const { todos } = props;
const itemCount = todos ? Object.keys(todos).filter(id => !props.todos[id].completed).length : 0;
const itemCount = Object.keys(todos).filter(id => !todos[id].completed).length;
return (
<Stack horizontal horizontalAlign="space-between">
<Text>
{itemCount} item{itemCount === 1 ? '' : 's'} left
</Text>
<DefaultButton onClick={() => props.clear()}>Clear Completed</DefaultButton>
<DefaultButton onClick={() => dispatch(actionsWithService.clear())}>Clear Completed</DefaultButton>
</Stack>
);
};
function mapStateToProps(state: Store) {
return { ...state };
}
function mapDispatchToProps(dispatch: any) {
return {
clear: () => dispatch(actions.clear())
};
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoFooter);
export { component as TodoFooter };

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step2-07/demo/src/components/TodoHeader.tsx
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@@ -1,19 +1,15 @@
import React from 'react';
import { Text, Stack, TextField, PrimaryButton } from 'office-ui-fabric-react';
import { Store } from '../store';
import { connect } from 'react-redux';
import { actions } from '../actions';
interface TodoHeaderProps {
addTodo: (label: string) => void;
}
import { Stack, Text, Pivot, PivotItem, TextField, PrimaryButton } from 'office-ui-fabric-react';
import { FilterTypes } from '../store';
import { actionsWithService, actions } from '../actions';
import { StoreContext } from 'redux-react-hook';
interface TodoHeaderState {
labelInput: string;
}
class TodoHeader extends React.Component<TodoHeaderProps, TodoHeaderState> {
constructor(props: TodoHeaderProps) {
export class TodoHeader extends React.Component<{}, TodoHeaderState> {
constructor(props: {}) {
super(props);
this.state = { labelInput: undefined };
}
@@ -22,42 +18,48 @@ class TodoHeader extends React.Component<TodoHeaderProps, TodoHeaderState> {
return (
<Stack gap={10}>
<Stack horizontal horizontalAlign="center">
<Text variant="xxLarge">todos - step2-07 demo</Text>
<Text variant="xxLarge">todos</Text>
</Stack>
<Stack horizontal gap={10}>
<Stack.Item grow>
<TextField placeholder="What needs to be done?" value={this.state.labelInput} onChange={this.onChange} />
<TextField
placeholder="What needs to be done?"
value={this.state.labelInput}
onChange={this.onChange}
styles={props => ({
...(props.focused && {
field: {
backgroundColor: '#c7e0f4'
}
})
})}
/>
</Stack.Item>
<PrimaryButton onClick={this.onAdd}>Add</PrimaryButton>
</Stack>
<Pivot onLinkClick={this.onFilter}>
<PivotItem headerText="all" />
<PivotItem headerText="active" />
<PivotItem headerText="completed" />
</Pivot>
</Stack>
);
}
private onAdd = () => {
this.props.addTodo(this.state.labelInput);
this.context.dispatch(actionsWithService.addTodo(this.state.labelInput));
this.setState({ labelInput: undefined });
};
private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
this.setState({ labelInput: newValue });
};
}
function mapStateToProps(state: Store) {
return { ...state };
}
function mapDispatchToProps(dispatch: any) {
return {
addTodo: (label: string) => dispatch(actions.addTodo(label))
private onFilter = (item: PivotItem) => {
this.context.dispatch(actions.setFilter(item.props.headerText as FilterTypes));
};
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoHeader);
export { component as TodoHeader };
TodoHeader.contextType = StoreContext;

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step2-07/demo/src/components/TodoList.tsx
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@@ -1,16 +1,13 @@
import React from 'react';
import { Stack } from 'office-ui-fabric-react';
import { TodoListItem } from './TodoListItem';
import { Store } from '../store';
import { connect } from 'react-redux';
import { useMappedState } from 'redux-react-hook';
interface TodoListProps {
todos: Store['todos'];
}
const TodoList = (props: TodoListProps) => {
const { todos } = props;
const filteredTodos = Object.keys(todos);
export const TodoList = () => {
const { filter, todos } = useMappedState(state => state);
const filteredTodos = Object.keys(todos).filter(id => {
return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
});
return (
<Stack gap={10}>
@@ -20,18 +17,3 @@ const TodoList = (props: TodoListProps) => {
</Stack>
);
};
function mapStateToProps(state: Store) {
return { ...state };
}
function mapDispatchToProps(dispatch: any) {
return {};
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoList);
export { component as TodoList };

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step2-07/demo/src/components/TodoListItem.tsx
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@@ -1,48 +1,78 @@
import React from 'react';
import { Stack, Checkbox, IconButton } from 'office-ui-fabric-react';
import { Store } from '../store';
import { connect } from 'react-redux';
import { actions } from '../actions';
import { Stack, Checkbox, IconButton, TextField, DefaultButton } from 'office-ui-fabric-react';
import { actionsWithService } from '../actions';
import { StoreContext } from 'redux-react-hook';
interface TodoListItemProps {
id: string;
todos: Store['todos'];
remove: (id: string) => void;
complete: (id: string) => void;
}
class TodoListItem extends React.Component<TodoListItemProps, {}> {
interface TodoListItemState {
editing: boolean;
editLabel: string;
}
export class TodoListItem extends React.Component<TodoListItemProps, TodoListItemState> {
constructor(props: TodoListItemProps) {
super(props);
this.state = { editing: false, editLabel: undefined };
}
render() {
const { todos, id, complete, remove } = this.props;
const { id } = this.props;
const { todos } = this.context.getState();
const dispatch = this.context.dispatch;
const item = todos[id];
return (
<Stack horizontal verticalAlign="center" horizontalAlign="space-between">
<Checkbox label={item.label} checked={item.completed} onChange={() => complete(id)} />
<div>
<IconButton iconProps={{ iconName: 'Cancel' }} onClick={() => remove(id)} />
</div>
{!this.state.editing && (
<>
<Checkbox label={item.label} checked={item.completed} onChange={() => dispatch(actionsWithService.complete(id))} />
<div>
<IconButton iconProps={{ iconName: 'Edit' }} onClick={this.onEdit} />
<IconButton iconProps={{ iconName: 'Cancel' }} onClick={() => dispatch(actionsWithService.remove(id))} />
</div>
</>
)}
{this.state.editing && (
<Stack.Item grow>
<Stack horizontal gap={10}>
<Stack.Item grow>
<TextField value={this.state.editLabel} onChange={this.onChange} />
</Stack.Item>
<DefaultButton onClick={this.onDoneEdit}>Save</DefaultButton>
</Stack>
</Stack.Item>
)}
</Stack>
);
}
}
function mapStateToProps({ todos }: Store) {
return {
todos
private onEdit = () => {
const { id } = this.props;
const { todos } = this.context.getState();
const { label } = todos[id];
this.setState({
editing: true,
editLabel: this.state.editLabel || label
});
};
private onDoneEdit = () => {
this.context.dispatch(actionsWithService.edit(this.props.id, this.state.editLabel));
this.setState({
editing: false,
editLabel: undefined
});
};
private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
this.setState({ editLabel: newValue });
};
}
function mapDispatchToProps(dispatch: any) {
return {
remove: (id: string) => dispatch(actions.remove(id)),
complete: (id: string) => dispatch(actions.complete(id))
};
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoListItem);
export { component as TodoListItem };
TodoListItem.contextType = StoreContext;

33
step2-07/demo/src/index.tsx
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@@ -1,23 +1,30 @@
import React from 'react';
import ReactDOM from 'react-dom';
import { reducer } from './reducers';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware } from 'redux';
import { TodoApp } from './components/TodoApp';
import { actions } from './actions';
import { initializeIcons } from '@uifabric/icons';
import { composeWithDevTools } from 'redux-devtools-extension';
import { StoreContext } from 'redux-react-hook';
import thunk from 'redux-thunk';
import { FilterTypes } from './store';
const store = createStore(reducer, {}, composeWithDevTools());
(async () => {
// TODO: to make the store pre-populate with data from the service,
// replace the todos value below with a call to "await service.getAll()"
const preloadStore = {
todos: {},
filter: 'all' as FilterTypes
};
store.dispatch(actions.addTodo('hello'));
store.dispatch(actions.addTodo('world'));
const store = createStore(reducer, preloadStore, composeWithDevTools(applyMiddleware(thunk)));
initializeIcons();
initializeIcons();
ReactDOM.render(
<Provider store={store}>
<TodoApp />
</Provider>,
document.getElementById('app')
);
ReactDOM.render(
<StoreContext.Provider value={store}>
<TodoApp />
</StoreContext.Provider>,
document.getElementById('app')
);
})();

54
step2-07/demo/src/reducers/index.ts
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@@ -1,27 +1,43 @@
import { Store } from '../store';
import { addTodo, remove, complete, clear } from './pureFunctions';
import { combineReducers } from 'redux';
import { createReducer } from 'redux-starter-kit';
function todoReducer(state: Store['todos'] = {}, action: any): Store['todos'] {
switch (action.type) {
case 'addTodo':
return addTodo(state, action.id, action.label);
export const todosReducer = createReducer<Store['todos']>(
{},
{
addTodo(state, action) {
state[action.id] = { label: action.label, completed: false };
},
case 'remove':
return remove(state, action.id);
remove(state, action) {
delete state[action.id];
},
case 'clear':
return clear(state);
clear(state, action) {
Object.keys(state).forEach(key => {
if (state[key].completed) {
delete state[key];
}
});
},
case 'complete':
return complete(state, action.id);
complete(state, action) {
state[action.id].completed = !state[action.id].completed;
},
edit(state, action) {
state[action.id].label = action.label;
}
}
);
return state;
}
export const filterReducer = createReducer<Store['filter']>('all', {
setFilter(state, action) {
return action.filter;
}
});
export function reducer(state: Store, action: any): Store {
return {
todos: todoReducer(state.todos, action),
filter: 'all'
};
}
export const reducer = combineReducers({
todos: todosReducer,
filter: filterReducer
});

29
step2-07/demo/src/reducers/pureFunctions.spec.ts
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@@ -1,29 +0,0 @@
import { addTodo, complete } from './pureFunctions';
import { Store } from '../store';
describe('TodoApp reducers', () => {
it('can add an item', () => {
const state = <Store['todos']>{};
const newState = addTodo(state, '0', 'item1');
const keys = Object.keys(newState);
expect(newState).not.toBe(state);
expect(keys.length).toBe(1);
expect(newState[keys[0]].label).toBe('item1');
expect(newState[keys[0]].completed).toBeFalsy();
});
it('can complete an item', () => {
const state = <Store['todos']>{};
let newState = addTodo(state, '0', 'item1');
const key = Object.keys(newState)[0];
newState = complete(newState, key);
expect(newState[key].completed).toBeTruthy();
});
});

35
step2-07/demo/src/reducers/pureFunctions.ts
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@@ -1,35 +0,0 @@
import { Store, FilterTypes } from '../store';
export function addTodo(state: Store['todos'], id: string, label: string): Store['todos'] {
return { ...state, [id]: { label, completed: false } };
}
export function remove(state: Store['todos'], id: string) {
const newTodos = { ...state };
delete newTodos[id];
return newTodos;
}
export function complete(state: Store['todos'], id: string) {
// Clone the todo, overriding
const newTodo = { ...state[id], completed: !state[id].completed };
return { ...state, [id]: newTodo };
}
export function clear(state: Store['todos']) {
const newTodos = { ...state };
Object.keys(state).forEach(key => {
if (state[key].completed) {
delete newTodos[key];
}
});
return newTodos;
}
export function setFilter(state: Store['filter'], filter: FilterTypes) {
return filter;
}

48
step2-07/demo/src/service/index.ts Normal file
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@@ -0,0 +1,48 @@
import { TodoItem, Store } from '../store';
const HOST = 'http://localhost:3000';
export async function add(id: string, todo: TodoItem) {
const response = await fetch(`${HOST}/todos/${id}`, {
method: 'post',
headers: { 'content-type': 'application/json' },
body: JSON.stringify(todo)
});
return await response.json();
}
export async function update(id: string, todo: TodoItem) {
const response = await fetch(`${HOST}/todos/${id}`, {
method: 'put',
headers: { 'content-type': 'application/json' },
body: JSON.stringify(todo)
});
return await response.json();
}
export async function remove(id: string) {
const response = await fetch(`${HOST}/todos/${id}`, {
method: 'delete'
});
return await response.json();
}
export async function getAll() {
const response = await fetch(`${HOST}/todos`, {
method: 'get'
});
return await response.json();
}
export async function updateAll(todos: Store['todos']) {
const response = await fetch(`${HOST}/todos`, {
method: 'post',
headers: { 'content-type': 'application/json' },
body: JSON.stringify(todos)
});
return await response.json();
}

23
step2-07/exercise/README.md
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@@ -1,23 +0,0 @@
# Step 2.7: Connect Redux store to view (Exercise)
[Lessons](../) | [Exercise](./exercise/) | [Demo](./demo/)
If you still have `npm test` running from the last step, stop it using `ctrl+C`. Start the app by running `npm start` from the root of the `frontend-bootcamp` folder. Click the "exercise" link under day 2 step 7 to see results.
At the beginning of this exercise, the "Add" and "Clear Completed" buttons do not work. We'll be fixing that in this step!
1. Open `exercise/src/index.tsx` and wrap `<TodoApp>` with `<Provider>` as instructed in the comment
2. Open `exercise/src/components/TodoFooter.tsx` and erase the "nullable" type modifier (i.e. the ?) in the interface definition of `TodoFooterProps`
3. Remove the `export` from `export const TodoFooter = (props: TodoFooterProps) => {`
4. Uncomment the bottom bits of code and fill in the implementation for `mapStateToProps()` and `mapDispatchToProps()` - feel free to use `TodoListItem.tsx` as a guide
5. Repeat steps 2, 3, and 4 for the `TodoHeader.tsx` file
## Bonus exercise
For further reading, go here to learn more about the `mergeProps` and `options` parameters to `connect()`:
https://react-redux.js.org/api/connect

11
step2-07/exercise/index.html
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@@ -1,11 +0,0 @@
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="../../assets/step.css" />
</head>
<body class="ms-Fabric">
<div id="markdownReadme" class="exercise" data-src="./README.md"></div>
<div id="app"></div>
<script src="../../assets/scripts.js"></script>
</body>
</html>

8
step2-07/exercise/src/actions/index.ts
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@@ -1,8 +0,0 @@
import uuid from 'uuid/v4';
export const actions = {
addTodo: (label: string) => ({ type: 'addTodo', id: uuid(), label }),
remove: (id: string) => ({ type: 'remove', id }),
complete: (id: string) => ({ type: 'complete', id }),
clear: () => ({ type: 'clear' })
};

25
step2-07/exercise/src/components/TodoApp.tsx
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@@ -1,25 +0,0 @@
import React from 'react';
import { Stack, Customizer, mergeStyles, getTheme } from 'office-ui-fabric-react';
import { TodoFooter } from './TodoFooter';
import { TodoHeader } from './TodoHeader';
import { TodoList } from './TodoList';
import { FluentCustomizations } from '@uifabric/fluent-theme';
const className = mergeStyles({
padding: 25,
...getTheme().effects.elevation4
});
export const TodoApp = () => {
return (
<Customizer {...FluentCustomizations}>
<Stack horizontalAlign="center">
<Stack style={{ width: 400 }} gap={25} className={className}>
<TodoHeader />
<TodoList />
<TodoFooter />
</Stack>
</Stack>
</Customizer>
);
};

44
step2-07/exercise/src/components/TodoFooter.tsx
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@@ -1,44 +0,0 @@
import React from 'react';
import { Store } from '../store';
import { DefaultButton, Text, Stack } from 'office-ui-fabric-react';
import { connect } from 'react-redux';
import { actions } from '../actions';
// TODO: after connecting to view, erase the ?'s
interface TodoFooterProps {
clear?: () => void;
todos?: Store['todos'];
}
export const TodoFooter = (props: TodoFooterProps) => {
const { todos } = props;
const itemCount = todos ? Object.keys(todos).filter(id => !props.todos[id].completed).length : 0;
return (
<Stack horizontal horizontalAlign="space-between">
<Text>
{itemCount} item{itemCount === 1 ? '' : 's'} left
</Text>
<DefaultButton onClick={() => props.clear()}>Clear Completed</DefaultButton>
</Stack>
);
};
/*
TODO: uncomment this and fill out the below code
function mapStateToProps(state: Store) {
// TODO: FILL THIS OUT
}
function mapDispatchToProps(dispatch: any) {
// TODO: FILL THIS OUT
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoFooter);
export { component as TodoFooter };
*/

68
step2-07/exercise/src/components/TodoHeader.tsx
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import React from 'react';
import { TextField, PrimaryButton, Text, Stack } from 'office-ui-fabric-react';
import { Store } from '../store';
import { connect } from 'react-redux';
import { actions } from '../actions';
// TODO: after connecting to view, erase the ?'s
interface TodoHeaderProps {
addTodo?: (label: string) => void;
}
interface TodoHeaderState {
labelInput: string;
}
export class TodoHeader extends React.Component<TodoHeaderProps, TodoHeaderState> {
constructor(props: TodoHeaderProps) {
super(props);
this.state = { labelInput: undefined };
}
render() {
return (
<Stack gap={10}>
<Stack horizontal horizontalAlign="center">
<Text variant="xxLarge">todos - step2-07 exercise</Text>
</Stack>
<Stack horizontal gap={10}>
<Stack.Item grow>
<TextField placeholder="What needs to be done?" value={this.state.labelInput} onChange={this.onChange} />
</Stack.Item>
<PrimaryButton onClick={this.onAdd}>Add</PrimaryButton>
</Stack>
</Stack>
);
}
private onAdd = () => {
this.props.addTodo(this.state.labelInput);
this.setState({ labelInput: undefined });
};
private onChange = (evt: React.FormEvent<HTMLInputElement>, newValue: string) => {
this.setState({ labelInput: newValue });
};
}
/*
TODO: uncomment the following and fill out the TODO's
function mapStateToProps(state: Store) {
// TODO: fill this out
}
function mapDispatchToProps(dispatch: any) {
// TODO: fill this out
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoHeader);
export { component as TodoHeader };
*/

37
step2-07/exercise/src/components/TodoList.tsx
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import React from 'react';
import { Stack } from 'office-ui-fabric-react';
import { TodoListItem } from './TodoListItem';
import { Store } from '../store';
import { connect } from 'react-redux';
interface TodoListProps {
todos: Store['todos'];
}
const TodoList = (props: TodoListProps) => {
const { todos } = props;
const filteredTodos = Object.keys(todos);
return (
<Stack gap={10}>
{filteredTodos.map(id => (
<TodoListItem key={id} id={id} />
))}
</Stack>
);
};
function mapStateToProps(state: Store) {
return { ...state };
}
function mapDispatchToProps(dispatch: any) {
return {};
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoList);
export { component as TodoList };

48
step2-07/exercise/src/components/TodoListItem.tsx
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import React from 'react';
import { Stack, Checkbox, IconButton } from 'office-ui-fabric-react';
import { Store } from '../store';
import { connect } from 'react-redux';
import { actions } from '../actions';
interface TodoListItemProps {
id: string;
todos: Store['todos'];
remove: (id: string) => void;
complete: (id: string) => void;
}
class TodoListItem extends React.Component<TodoListItemProps, {}> {
render() {
const { todos, id, complete, remove } = this.props;
const item = todos[id];
return (
<Stack horizontal verticalAlign="center" horizontalAlign="space-between">
<Checkbox label={item.label} checked={item.completed} onChange={() => complete(id)} />
<div>
<IconButton iconProps={{ iconName: 'Cancel' }} onClick={() => remove(id)} />
</div>
</Stack>
);
}
}
function mapStateToProps({ todos }: Store) {
return {
todos
};
}
function mapDispatchToProps(dispatch: any) {
return {
remove: (id: string) => dispatch(actions.remove(id)),
complete: (id: string) => dispatch(actions.complete(id))
};
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoListItem);
export { component as TodoListItem };

24
step2-07/exercise/src/index.tsx
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import React from 'react';
import ReactDOM from 'react-dom';
import { reducer } from './reducers';
import { createStore } from 'redux';
import { Provider } from 'react-redux';
import { TodoApp } from './components/TodoApp';
import { actions } from './actions';
import { initializeIcons } from '@uifabric/icons';
import { composeWithDevTools } from 'redux-devtools-extension';
const store = createStore(reducer, {}, composeWithDevTools());
store.dispatch(actions.addTodo('hello'));
store.dispatch(actions.addTodo('world'));
initializeIcons();
// TODO: see how we added Provider is the root element
ReactDOM.render(
<Provider store={store}>
<TodoApp />
</Provider>,
document.getElementById('app')
);

27
step2-07/exercise/src/reducers/index.ts
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import { Store } from '../store';
import { addTodo, remove, complete, clear } from './pureFunctions';
function todoReducer(state: Store['todos'] = {}, action: any): Store['todos'] {
switch (action.type) {
case 'addTodo':
return addTodo(state, action.id, action.label);
case 'remove':
return remove(state, action.id);
case 'clear':
return clear(state);
case 'complete':
return complete(state, action.id);
}
return state;
}
export function reducer(state: Store, action: any): Store {
return {
todos: todoReducer(state.todos, action),
filter: 'all'
};
}

29
step2-07/exercise/src/reducers/pureFunctions.spec.ts
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import { addTodo, complete } from './pureFunctions';
import { Store } from '../store';
describe('TodoApp reducers', () => {
it('can add an item', () => {
const state = <Store['todos']>{};
const newState = addTodo(state, '0', 'item1');
const keys = Object.keys(newState);
expect(newState).not.toBe(state);
expect(keys.length).toBe(1);
expect(newState[keys[0]].label).toBe('item1');
expect(newState[keys[0]].completed).toBeFalsy();
});
it('can complete an item', () => {
const state = <Store['todos']>{};
let newState = addTodo(state, '0', 'item1');
const key = Object.keys(newState)[0];
newState = complete(newState, key);
expect(newState[key].completed).toBeTruthy();
});
});

35
step2-07/exercise/src/reducers/pureFunctions.ts
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import { Store, FilterTypes } from '../store';
export function addTodo(state: Store['todos'], id: string, label: string): Store['todos'] {
return { ...state, [id]: { label, completed: false } };
}
export function remove(state: Store['todos'], id: string) {
const newTodos = { ...state };
delete newTodos[id];
return newTodos;
}
export function complete(state: Store['todos'], id: string) {
// Clone the todo, overriding
const newTodo = { ...state[id], completed: !state[id].completed };
return { ...state, [id]: newTodo };
}
export function clear(state: Store['todos']) {
const newTodos = { ...state };
Object.keys(state).forEach(key => {
if (state[key].completed) {
delete newTodos[key];
}
});
return newTodos;
}
export function setFilter(state: Store['filter'], filter: FilterTypes) {
return filter;
}

14
step2-07/exercise/src/store/index.ts
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export type FilterTypes = 'all' | 'active' | 'completed';
export interface TodoItem {
label: string;
completed: boolean;
}
export interface Store {
todos: {
[id: string]: TodoItem;
};
filter: FilterTypes;
}