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@spion spion/01-before.jsx
Last active May 4, 2019

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import React, { useState, useEffect } from 'react';
function useFriendStatus(friendID) {
const [isOnline, setIsOnline] = useState(null);
useEffect(() => {
function handleStatusChange(status) {
setIsOnline(status.isOnline);
}
ChatAPI.subscribeToFriendStatus(friendID, handleStatusChange);
return () => {
ChatAPI.unsubscribeFromFriendStatus(friendID, handleStatusChange);
};
});
return isOnline;
}
/// ....
function FriendStatus(props) {
const isOnline = useFriendStatus(props.friend.id);
if (isOnline === null) {
return 'Loading...';
}
return isOnline ? 'Online' : 'Offline';
}
function FriendListItem(props) {
const isOnline = useFriendStatus(props.friend.id);
return (
<li style={{ color: isOnline ? 'green' : 'black' }}>
{props.friend.name}
</li>
);
}
function useFriendStatus(friendID) {
const [isOnline, setIsOnline] = this.useState(null);
this.useEffect(() => {
function handleStatusChange(status) {
setIsOnline(status.isOnline);
}
ChatAPI.subscribeToFriendStatus(friendID, handleStatusChange);
return () => {
ChatAPI.unsubscribeFromFriendStatus(friendID, handleStatusChange);
};
});
return isOnline;
}
/// ....
function FriendStatus(props) {
const isOnline = this::useFriendStatus(props.friend.id);
if (isOnline === null) {
return 'Loading...';
}
return isOnline ? 'Online' : 'Offline';
}
function FriendListItem(props) {
const isOnline = this::useFriendStatus(props.friend.id);
return (
<li style={{ color: isOnline ? 'green' : 'black' }}>
{props.friend.name}
</li>
);
}
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