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Micah Godbolt
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23
docs/step2-07/README.md
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# Step 2.7
[Lessons](../) | [Exercise](./exercise/) | [Demo](./demo/)
Connect store to view with `react-redux`. `connect()` is used to turn Redux store and dispatch functions into props inside React components. The state and action dispatchers are passed along with a `<Provider>` component.
```ts
const NewComponent = function connect(mapStateToProps?, mapDispatchToProps?, mergeProps?, options?)(OldComponent);
```
The `connect()` function takes in a few functions that maps some portion of the state tree and dispatcher functions as props. It is a **higher order function** meaning that the return value of `connect()` is a function that decorates OldComponents into a NewComponent with all the mapped props.
This `mapStateToProps` function selects out portions of the state tree. This function informs the connected view when to re-render based on a shallow comparison from previous state.
# Exercise
1. open up `exercise/src/index.tsx` and wrap `<TodoApp>` with `<Provider>` as instructed in the comment
2. open up `exercise/src/components/TodoFooter.tsx` and erase the "nullable" type modifier (i.e. the ?) in the interface definition of `TodoFooterProps`
3. uncomment the bottom bits of code and fill in the implementation for `mapStateToProps()` and `mapDispatchToProps()` - feel free to use `TodoListItem.tsx` as a guide
4. do steps 2 and 3 for the `TodoHeader.tsx` file

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docs/step2-07/demo/index.html
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<!doctype html><html><head><link rel="stylesheet" href="../../assets/step.css"></head><body class="ms-Fabric"><div id="markdownReadme"></div><div id="app"></div><script src="../../step2-07/demo/step2-07/demo.js"></script><script src="../../markdownReadme/markdownReadme.js"></script></body></html>

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docs/step2-07/demo/src/actions/index.ts
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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' })
};

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docs/step2-07/demo/src/components/TodoApp.tsx
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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 { 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>
</Customizer>
);
};

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docs/step2-07/demo/src/components/TodoFooter.tsx
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import React from 'react';
import { Text } from '@uifabric/experiments';
import { Stack } from 'office-ui-fabric-react';
import { Store } from '../store';
import { DefaultButton } from 'office-ui-fabric-react';
import { connect } from 'react-redux';
import { actions } from '../actions';
interface TodoFooterProps {
clear: () => void;
todos: Store['todos'];
}
const TodoFooter = (props: TodoFooterProps) => {
const itemCount = Object.keys(props.todos).filter(id => !props.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>
</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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docs/step2-07/demo/src/components/TodoHeader.tsx
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import React from 'react';
import { Text } from '@uifabric/experiments';
import { Stack } from 'office-ui-fabric-react';
import { 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;
}
interface TodoHeaderState {
labelInput: string;
}
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</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 });
};
}
function mapStateToProps(state: Store) {
return { ...state };
}
function mapDispatchToProps(dispatch: any) {
return {
addTodo: (label: string) => dispatch(actions.addTodo(label))
};
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoHeader);
export { component as TodoHeader };

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docs/step2-07/demo/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 };

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docs/step2-07/demo/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 };

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docs/step2-07/demo/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();
ReactDOM.render(
<Provider store={store}>
<TodoApp />
</Provider>,
document.getElementById('app')
);

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docs/step2-07/demo/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'
};
}

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docs/step2-07/demo/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();
});
});

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docs/step2-07/demo/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) {
const newTodos = { ...state };
newTodos[id].completed = !newTodos[id].completed;
return newTodos;
}
export function clear(state: Store['todos']) {
const newTodos = { ...state };
Object.keys(state.todos).forEach(key => {
if (state.todos[key].completed) {
delete newTodos[key];
}
});
return newTodos;
}
export function setFilter(state: Store['filter'], filter: FilterTypes) {
return filter;
}

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docs/step2-07/demo/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;
}

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<!doctype html><html><head><link rel="stylesheet" href="../../assets/step.css"></head><body class="ms-Fabric"><div id="markdownReadme"></div><div id="app"></div><script src="../../step2-07/exercise/step2-07/exercise.js"></script><script src="../../markdownReadme/markdownReadme.js"></script></body></html>

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docs/step2-07/exercise/src/actions/index.ts
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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' })
};

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docs/step2-07/exercise/src/components/TodoApp.tsx
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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>
);
};

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docs/step2-07/exercise/src/components/TodoFooter.tsx
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import React from 'react';
import { Text } from '@uifabric/experiments';
import { Stack } from 'office-ui-fabric-react';
import { Store } from '../store';
import { DefaultButton } 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 itemCount = Object.keys(props.todos).filter(id => !props.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>
</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 };
*/

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import React from 'react';
import { Text } from '@uifabric/experiments';
import { Stack } from 'office-ui-fabric-react';
import { TextField, PrimaryButton } 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</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 };
*/

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docs/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 };

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docs/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 };

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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: wrap <TodoApp> with a <Provider store={store}> instance here
ReactDOM.render(<TodoApp />, document.getElementById('app'));

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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'
};
}

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docs/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();
});
});

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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) {
const newTodos = { ...state };
newTodos[id].completed = !newTodos[id].completed;
return newTodos;
}
export function clear(state: Store['todos']) {
const newTodos = { ...state };
Object.keys(state.todos).forEach(key => {
if (state.todos[key].completed) {
delete newTodos[key];
}
});
return newTodos;
}
export function setFilter(state: Store['filter'], filter: FilterTypes) {
return filter;
}

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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;
}

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