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import React, { useState } from 'react'; | |
import { generateId, getNewExpirationTime } from './utilities'; | |
export function AddThoughtForm(props) { | |
const [text, setText] = useState(''); | |
const handleTextChange = (event) => { | |
setText(event.target.value); | |
}; | |
const handleSubmit = (event) => { | |
event.preventDefault(); | |
if (text.length > 0) { | |
const thought = { | |
id: generateId(), | |
text: text, | |
expiresAt: getNewExpirationTime(), | |
}; | |
props.addThought(thought); | |
setText(''); | |
}; | |
}; | |
return ( | |
<form className="AddThoughtForm" onSubmit={handleSubmit}> | |
<input | |
type="text" | |
aria-label="What's on your mind?" | |
placeholder="What's on your mind?" | |
value={text} | |
onChange={handleTextChange} | |
/> | |
<input type="submit" value="Add" /> | |
</form> | |
); | |
} |
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import React, { useState } from 'react'; | |
import ReactDOM from 'react-dom'; | |
import { AddThoughtForm } from './AddThoughtForm'; | |
import { Thought } from './Thought'; | |
import { generateId, getNewExpirationTime } from './utilities'; | |
function App() { | |
const [thoughts, setThoughts] = useState([ | |
{ | |
id: generateId(), | |
text: 'This is a place for your passing thoughts.', | |
expiresAt: getNewExpirationTime(), | |
}, | |
{ | |
id: generateId(), | |
text: "They'll be removed after 15 seconds.", | |
expiresAt: getNewExpirationTime(), | |
}, | |
]); | |
const addThought = (thought) => { | |
setThoughts((thoughts) => [thought, ...thoughts]); | |
}; | |
const removeThought = (thoughtIdToRemove) => { | |
setThoughts((thoughts) => thoughts.filter((thought) => thought.id !== thoughtIdToRemove) | |
); | |
}; | |
return ( | |
<div className="App"> | |
<header> | |
<h1>Passing Thoughts</h1> | |
</header> | |
<main> | |
<AddThoughtForm addThought={addThought} /> | |
<ul className="thoughts"> | |
{thoughts.map((thought) => ( | |
<Thought key={thought.id} thought={thought} removeThought={removeThought}/> | |
))} | |
</ul> | |
</main> | |
</div> | |
); | |
} | |
ReactDOM.render(<App />, document.getElementById('app')); |
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import React, {useEffect} from 'react'; | |
export function Thought(props) { | |
const { thought, removeThought } = props; | |
useEffect(() => { | |
const timeRemaining = thought.expiresAt - Date.now(); | |
const timeout = setTimeout(() => { | |
removeThought(thought.id); | |
}, timeRemaining); | |
return () => { | |
clearTimeout(timeout); | |
}; | |
}, [thought]); | |
const handleRemoveClick = () => { | |
removeThought(thought.id); | |
}; | |
return ( | |
<li className="Thought"> | |
<button | |
aria-label="Remove thought" | |
className="remove-button" | |
onClick={handleRemoveClick} | |
> | |
× | |
</button> | |
<div className="text">{thought.text}</div> | |
</li> | |
); | |
} |
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