step 5 done

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Micah Godbolt
2019-02-22 19:06:22 -08:00
parent 9a27b7038e
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start with
style/index/index/failing imports
# Thinking In React: Hierarchy and Building a Static Version
demo
## Demo
Header
ListItem
To start off our Todo application we are going to follow the steps outline in [Thinking in React](https://reactjs.org/docs/thinking-in-react.html). The first step of the process is to break our application into a component hierarchy. For this app, we're going to keep it simple and just use four parts.
exercise
- TodoHeader
- TodoList
-TodoListItem
- TodoFooter
Footer
List
We could go a lot deeping creating buttons, inputs and checkboxes, but this is a great place start. Often you'll want to start with a single large control, and then start breaking it up into smaller pieces.
### TodoApp
```jsx
import React from 'react';
import { TodoFooter } from './components/TodoFooter';
import { TodoHeader } from './components/TodoHeader';
import { TodoList } from './components/TodoList';
export class TodoApp extends React.Component {
render() {
return (
<div>
<TodoHeader />
<TodoList />
<TodoFooter />
</div>
);
}
}
```
We'll start off with all of the file scaffolded and imported into our App. This will let us dive right into each control and see updates quickly.
### TodoHeader
Our objective is to create a static version of our application, so we'll copy over the entire header tag, minus any function calls we may have added.
> Note that since this is React we had to change `class` to `className`, otherwise nothing changes
```jsx
return (
<header>
<h1>todos</h1>
<div className="addTodo">
<input className="textfield" placeholder="add todo" />
<button className="submit">Add</button>
</div>
<nav className="filter">
<button className="completed">all</button>
<button>active</button>
<button>completed</button>
</nav>
</header>
);
```
### TodoListItem
Anytime you see repeated complex elements, that is usually a sign to create a new component. With a few props you can typically abstract all of those elements into a single component. This is certainly the case with Todos items.
```jsx
return (
<li className="todo">
<label>
<input type="checkbox" /> Todo 1
</label>
</li>
);
```
> Note that I've removed the title span as it was only needed to make targeting that text easier
## Exercise
### TodoFooter
1. Update the TodoFooter component, copying over the `<footer>` tag and all of its children
2. Remove any `onclick` properties, and change `class` to `className`
### TodoList
1. Update the TodoList component like you did with the footer.
2. Import TodoListItem and add 4 of them inside of the `<ul>`
3. Bonus points for using a [`for`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration) loop or using [`map`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map) to create 4 list items based on the array `[1,2,3,4]`