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* update to hooks * more class to function * cleanup * finish ts final * update html lesson * add lessons page * clean up * move getters into context * adding type * fix bug * step 5 cleanup * init final pass * text tweak * fix ternaries * readme cleanup * fixed root readme
58 lines
1.9 KiB
Markdown
58 lines
1.9 KiB
Markdown
# Step 1.5 - Building a static page in React (Demo)
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To start building our todo application, we'll follow the steps outlined 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.
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- TodoHeader
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- TodoList
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- TodoListItem
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- TodoFooter
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You can find the HTML for our application in `step1-05/TodoApp.html`.
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## TodoHeader
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We'll store all of our components inside a `components` folder under `step1-05/demo/src`. Let's create that now. We'll then start writing the `TodoHeader` in `src/components/TodoHeader.tsx`. The `tsx` file extension tells our editor that this file includes React code written in TypeScript.
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> We'll talk about TypeScript soon, but for now, know that all valid JavaScript is valid TypeScript.
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```jsx
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import React from 'react';
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export const TodoHeader = () => {
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return (
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<header>
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<h1>todos</h1>
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<div className="addTodo">
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<input className="textfield" placeholder="add todo" />
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<button className="submit">Add</button>
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</div>
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<nav className="filter">
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<button className="completed">all</button>
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<button>active</button>
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<button>completed</button>
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</nav>
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</header>
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);
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};
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```
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> Note that since this is React, we had to change `class` to `className`, but nothing else changes.
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## TodoListItem
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Any time you see repeated complex elements, that is usually a sign that you should 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 todo items.
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```jsx
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import React from 'react';
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export const TodolistItem = () => {
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return (
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<li className="todo">
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<label>
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<input type="checkbox" /> Todo 1
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</label>
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</li>
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);
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};
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```
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