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step 9 exercise complete!

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Ken
2019-02-20 11:01:57 -08:00
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step2-09/README.md
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# Step 2.9 # Step 2.9
actions with service calls Redux Thunk middleware for actions with service calls. The documentation is here:
https://github.com/reduxjs/redux-thunk
Action creators are a natural place to put service calls. Redux thunk middleware passes in the `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!
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.
# Exercise
1. open up `exercise/src/service/index.ts` and study the signature of the functions to call the service such as the `add()` function
2. open `exercise/src/actions/index.ts` and fill in the missing content inside `actionsWithService`
- note that the `complete` and `clear` functions require you to write your own wrapper function
3. open `exercise/src/index.tsx` and follow the instructions in the TODO comment to make the app prepopulate with data from the service.

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step2-09/index.html → step2-09/demo/index.html
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step2-09/src/actions/index.ts → step2-09/demo/src/actions/index.ts
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step2-09/src/components/TodoApp.tsx → step2-09/demo/src/components/TodoApp.tsx
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step2-09/src/components/TodoFooter.tsx → step2-09/demo/src/components/TodoFooter.tsx
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step2-09/src/components/TodoHeader.tsx → step2-09/demo/src/components/TodoHeader.tsx
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step2-09/src/components/TodoList.tsx → step2-09/demo/src/components/TodoList.tsx
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step2-09/src/components/TodoListItem.tsx → step2-09/demo/src/components/TodoListItem.tsx
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step2-09/src/index.tsx → step2-09/demo/src/index.tsx
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step2-09/src/reducers/index.ts → step2-09/demo/src/reducers/index.ts
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step2-09/src/reducers/pureFunctions.spec.ts → step2-09/demo/src/reducers/pureFunctions.spec.ts
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step2-09/src/reducers/pureFunctions.ts → step2-09/demo/src/reducers/pureFunctions.ts
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step2-09/src/service/index.ts → step2-09/demo/src/service/index.ts
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@@ -11,7 +11,7 @@ export async function add(id: string, todo: TodoItem) {
return await response.json(); return await response.json();
} }
export async function edit(id: string, todo: TodoItem) { export async function update(id: string, todo: TodoItem) {
const response = await fetch(`${HOST}/todos/${id}`, { const response = await fetch(`${HOST}/todos/${id}`, {
method: 'put', method: 'put',
headers: { 'content-type': 'application/json' }, headers: { 'content-type': 'application/json' },
@@ -37,7 +37,7 @@ export async function getAll() {
return await response.json(); return await response.json();
} }
export async function editBulk(todos: Store['todos']) { export async function updateAll(todos: Store['todos']) {
const response = await fetch(`${HOST}/todos`, { const response = await fetch(`${HOST}/todos`, {
method: 'post', method: 'post',
headers: { 'content-type': 'application/json' }, headers: { 'content-type': 'application/json' },

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step2-09/src/store/index.ts → step2-09/demo/src/store/index.ts
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<!DOCTYPE html>
<html>
<body>
<div id="app"></div>
</body>
</html>

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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' }),
setFilter: (filter: string) => ({ type: 'setFilter', filter })
};
export const actionsWithService = {
addTodo: (label: string) => {
return async (dispatch: any, getState: () => Store) => {
// Replace the return true with:
// 1. first call the actions.addTodo() function
// 2. store the resultant id
// 3. dispatch the action message generated by that call
// 4. pass the id and the todo from the state into the service call service.add()
return true;
};
},
remove: (id: string) => {
return async (dispatch: any, getState: () => Store) => {
// Replace the return true with:
// 1. dispatch a remove action with the id
// 2. await on the call to the service.remove()
return true;
};
},
complete: (id: string) => {
// ** Now it's your turn to write the thunk! **
// Replace the return Promise.resolve(true) with:
// 1. return an async function with the arguments of dispatch and getState
// 2. dispatch a remove action with the id
// 3. await on the call to the service.update()
return Promise.resolve(true);
},
clear: () => {
// ** Write your own thunk again! **
// Replace the return Promise.resolve(true) with:
// 1. return an async function with the arguments of dispatch and getState
// 2. dispatch a clear action
// 3. await on the call to the service.updateAll()
return Promise.resolve(true);
}
};

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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 class TodoApp extends React.Component<any, Store> {
constructor(props) {
super(props);
this.state = {
todos: {},
filter: 'all'
};
}
render() {
const { filter, todos } = this.state;
return (
<Customizer {...FluentCustomizations}>
<Stack horizontalAlign="center">
<Stack style={{ width: 400 }} gap={25} className={className}>
<TodoHeader />
<TodoList />
<TodoFooter />
</Stack>
</Stack>
</Customizer>
);
}
}

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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 { actionsWithService } 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(actionsWithService.clear())
};
}
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 { Pivot, PivotItem, TextField, PrimaryButton } from 'office-ui-fabric-react';
import { FilterTypes, Store } from '../store';
import { actionsWithService, actions } from '../actions';
import { connect } from 'react-redux';
interface TodoHeaderProps {
addTodo: (label: string) => void;
setFilter: (filter: FilterTypes) => void;
filter: FilterTypes;
}
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>
<Pivot onLinkClick={this.onFilter}>
<PivotItem headerText="all" />
<PivotItem headerText="active" />
<PivotItem headerText="completed" />
</Pivot>
</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 });
};
private onFilter = (item: PivotItem) => {
this.props.setFilter(item.props.headerText as FilterTypes);
};
}
function mapStateToProps(state: Store) {
return { ...state };
}
function mapDispatchToProps(dispatch: any) {
return {
addTodo: (label: string) => dispatch(actionsWithService.addTodo(label)),
setFilter: (filter: FilterTypes) => dispatch(actions.setFilter(filter))
};
}
const component = connect(
mapStateToProps,
mapDispatchToProps
)(TodoHeader);
export { component as TodoHeader };

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import React from 'react';
import { Stack } from 'office-ui-fabric-react';
import { TodoListItem } from './TodoListItem';
import { Store, FilterTypes } from '../store';
import { connect } from 'react-redux';
interface TodoListProps {
todos: Store['todos'];
filter: FilterTypes;
}
const TodoList = (props: TodoListProps) => {
const { filter, todos } = props;
const filteredTodos = Object.keys(todos).filter(id => {
return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
});
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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step2-09/exercise/src/components/TodoListItem.tsx Normal file
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import React from 'react';
import { Stack, Checkbox, IconButton, TextField, DefaultButton } from 'office-ui-fabric-react';
import { Store } from '../store';
import { connect } from 'react-redux';
import { actionsWithService } 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(actionsWithService.remove(id)),
complete: (id: string) => dispatch(actionsWithService.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 { applyMiddleware, createStore, compose } from 'redux';
import thunk from 'redux-thunk';
import { Provider } from 'react-redux';
import { TodoApp } from './components/TodoApp';
import { initializeIcons } from '@uifabric/icons';
import { Store, FilterTypes } from './store';
import * as service from './service';
/* Goop for making the Redux dev tool to work */
declare var window: any;
const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;
function createStoreWithDevTool(reducer, initialStore?: Store) {
return createStore(reducer, initialStore, composeEnhancers(applyMiddleware(thunk)));
}
(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
};
const store = createStoreWithDevTool(reducer, preloadStore);
initializeIcons();
ReactDOM.render(
<Provider store={store}>
<TodoApp />
</Provider>,
document.getElementById('app')
);
})();

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import { Store } from '../store';
import { addTodo, remove, complete, clear, setFilter } from './pureFunctions';
import { combineReducers } from 'redux';
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;
}
function filterReducer(state: Store['filter'] = 'all', action: any): Store['filter'] {
switch (action.type) {
case 'setFilter':
return setFilter(state, action.filter);
}
return state;
}
export const reducer = combineReducers({
todos: todoReducer,
filter: filterReducer
});

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step2-09/exercise/src/reducers/pureFunctions.spec.ts Normal file
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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 edit(state: Store['todos'], id: string, label: string): Store['todos'] {
return { ...state, [id]: { ...state[id], label } };
}
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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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();
}

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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;
}