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Micah Godbolt
2019-02-25 13:12:18 -08:00
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## Exercise
### TodoFooter
1. Open TodoFooter and write a TodoFooterProps interface. It should include two values, a function and an object. Assign this interface to props like this: `(props: TodoFooterProps)`
2. Write an `_onClick` function that calls `props.clear`.
> Since TodoFooter is not a class the `_onClick` needs to be declared as a const, and placed before the `return`.
3. Add `_onClick` to the button's `onClick`. You won't need to use `this` since this isn't a class.
> We can't assign our `clear` function directly to `onClick`. We always need to create a function that calls our callbacks. `() => props.clear()`
4. Test out this functionality. Check a few todos complete and click the `Clear Completed` button
### TodoHeader
1. Open TodoHeader and write TodoHeaderProps which will include 3 values. Replace the first `any` with this interface.
2. This component also has state. Write TodoHeaderState (there's just one item), and add this where the second `any` was.
3. Add `_onFilter` to each of the filter buttons
> Note that we can't add new parameters to onClick, but we can pull information from the event target!
4. Write an `_onAdd` method that calls `addTodo` on the current `labelInput`, then sets the `labelInput` in state to an empty string
5. Call `_onAdd` from the submit button
6. Check out this new functionality! We can now add and filter todos!

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<!doctype html><html><link rel="stylesheet" href="./src/style.css"><body><div id="app"></div><script src="../../step1-07/exercise/step1-07/exercise.js"></script><script src="../../markdownReadme/markdownReadme.js"></script></body></html>

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import React from 'react';
import { TodoFooter } from './components/TodoFooter';
import { TodoHeader } from './components/TodoHeader';
import { TodoList } from './components/TodoList';
import { Todos, FilterTypes } from './TodoApp.types';
let index = 0;
export class TodoApp extends React.Component<any, { todos: Todos; filter: FilterTypes }> {
constructor(props) {
super(props);
this.state = {
todos: {},
filter: 'all'
};
}
render() {
const { filter, todos } = this.state;
return (
<div>
<TodoHeader addTodo={this._addTodo} setFilter={this._setFilter} filter={filter} />
<TodoList complete={this._complete} todos={todos} filter={filter} />
<TodoFooter clear={this._clear} todos={todos} />
</div>
);
}
// business logic
private _addTodo = label => {
const { todos } = this.state;
const id = index++;
this.setState({
todos: { ...todos, [id]: { label, completed: false } }
});
};
private _complete = id => {
const newTodos = { ...this.state.todos };
newTodos[id].completed = !newTodos[id].completed;
this.setState({
todos: newTodos
});
};
private _clear = () => {
const { todos } = this.state;
const newTodos = {};
Object.keys(this.state.todos).forEach(id => {
if (!todos[id].completed) {
newTodos[id] = todos[id];
}
});
this.setState({
todos: newTodos
});
};
private _setFilter = filter => {
this.setState({
filter: filter
});
};
}

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docs/step1-07/exercise/src/TodoApp.types.ts Normal file
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export type FilterTypes = 'all' | 'active' | 'completed';
export interface TodoItem {
label: string;
completed: boolean;
}
export interface Todos {
[id: string]: TodoItem;
}

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docs/step1-07/exercise/src/components/TodoFooter.tsx Normal file
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import React from 'react';
import { Todos } from '../TodoApp.types';
export const TodoFooter = props => {
const itemCount = Object.keys(props.todos).filter(id => !props.todos[id].completed).length;
return (
<footer>
<span>
{itemCount} item{itemCount > 1 ? 's' : ''} left
</span>
<button className="submit">Clear Completed</button>
</footer>
);
};

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docs/step1-07/exercise/src/components/TodoHeader.tsx Normal file
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import React from 'react';
import { FilterTypes } from '../TodoApp.types';
export class TodoHeader extends React.Component<any, any> {
constructor(props) {
super(props);
this.state = { labelInput: '' };
}
render() {
const { filter } = this.props;
return (
<header>
<h1>todos</h1>
<div className="addTodo">
<input value={this.state.labelInput} onChange={this._onChange} className="textfield" placeholder="add todo" />
<button className="submit">Add</button>
</div>
<nav className="filter">
<button className={filter == 'all' ? 'selected' : ''}>all</button>
<button className={filter == 'active' ? 'selected' : ''}>active</button>
<button className={filter == 'completed' ? 'selected' : ''}>completed</button>
</nav>
</header>
);
}
_onFilter = evt => {
this.props.setFilter(evt.target.textContet);
};
_onChange = evt => {
this.setState({ labelInput: evt.target.value });
};
}

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import React from 'react';
import { TodoListItem } from './TodoListItem';
import { FilterTypes, Todos } from '../TodoApp.types';
interface TodoListProps {
complete: (id: string) => void;
todos: Todos;
filter: FilterTypes;
}
export class TodoList extends React.Component<TodoListProps, any> {
render() {
const { filter, todos, complete } = this.props;
const filteredTodos = Object.keys(todos).filter(id => {
return filter === 'all' || (filter === 'completed' && todos[id].completed) || (filter === 'active' && !todos[id].completed);
});
return (
<ul className="todos">
{filteredTodos.map(id => (
<TodoListItem key={id} id={id} complete={complete} {...todos[id]} />
))}
</ul>
);
}
}

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docs/step1-07/exercise/src/components/TodoListItem.tsx Normal file
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import React from 'react';
import { TodoItem } from '../TodoApp.types';
interface TodoListItemProps extends TodoItem {
id: string;
complete: (id: string) => void;
}
export class TodoListItem extends React.Component<TodoListItemProps, any> {
render() {
const { label, completed, complete, id } = this.props;
return (
<li className="todo">
<label>
<input type="checkbox" checked={completed} onChange={() => complete(id)} /> {label}
</label>
</li>
);
}
}

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import React from 'react';
import ReactDOM from 'react-dom';
import { TodoApp } from './TodoApp';
ReactDOM.render(<TodoApp />, document.getElementById('app'));

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body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
width: 400px;
margin: 20px auto;
}
h1 {
text-align: center;
}
.addTodo {
display: flex;
}
.textfield {
flex-grow: 1;
margin-right: 10px;
}
.submit {
border: none;
padding: 5px 10px;
}
.filter {
margin: 10px 0 0;
}
.filter button {
background: transparent;
border: none;
}
.filter .selected {
border-bottom: 2px solid blue;
}
.todos {
list-style: none;
padding: 0;
}
footer {
display: flex;
}
footer span {
flex-grow: 1;
}

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