Reactã®useActionStateãšããã«ãŠã§ã¢ãã€ãã©ã€ã³ã®åãæ¢ããå ç¢ã§å¹ççãªã¢ã¯ã·ã§ã³åŠçãå®çŸããŸããæè»ã§ä¿å®ããããã¢ããªã±ãŒã·ã§ã³ã®æ§ç¯æ¹æ³ãåŠã³ãŸãããã
React useActionState ããã«ãŠã§ã¢ãã€ãã©ã€ã³: å ç¢ãªã¢ã¯ã·ã§ã³åŠçãã§ãŒã³ãæ§ç¯ãã
Reactã®useActionStateããã¯ã¯ãç¶æ
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useActionStateããã«ãŠã§ã¢ãã€ãã©ã€ã³ã®å®è£
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åºæ¬äŸ: ã¢ã¯ã·ã§ã³ã®ãã°èšé²
ãŸããåã¢ã¯ã·ã§ã³ãã³ã³ãœãŒã«ã«ãã°èšé²ããã·ã³ãã«ãªããã«ãŠã§ã¢ãäœæããŸãããã
// Middleware function
const loggerMiddleware = (action, setState) => {
console.log('Action:', action);
setState(action);
};
// Custom useActionState hook
const useActionStateWithMiddleware = (initialState, middleware) => {
const [state, setState] = React.useState(initialState);
const dispatch = React.useCallback(
action => {
middleware(action, setState);
},
[middleware, setState]
);
return [state, dispatch];
};
// Usage
const MyComponent = () => {
const [count, setCount] = useActionStateWithMiddleware(0, loggerMiddleware);
const increment = () => {
setCount(count + 1);
};
return (
Count: {count}
);
};
ãã®äŸã§ã¯:
loggerMiddlewareã¯ãã¢ã¯ã·ã§ã³ããã°ã«èšé²ããsetStateãåŒã³åºããŠç¶æ ãæŽæ°ããã·ã³ãã«ãªããã«ãŠã§ã¢é¢æ°ã§ããuseActionStateWithMiddlewareã¯ãåæç¶æ ãšããã«ãŠã§ã¢é¢æ°ãåŒæ°ãšããŠåãåãã«ã¹ã¿ã ããã¯ã§ããdispatch颿°ã¯ãäžèŠãªåã¬ã³ããªã³ã°ãé²ãããã«useCallbackã䜿çšããŠäœæãããŸããããã¯ãã¢ã¯ã·ã§ã³ãšsetStateã䜿çšããŠããã«ãŠã§ã¢é¢æ°ãåŒã³åºããŸãã
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ãã€ãã©ã€ã³ãäœæããã«ã¯ãè€æ°ã®ããã«ãŠã§ã¢é¢æ°ãé£çµããæ¹æ³ãå¿ èŠã§ãããããã§ãã颿°ã以äžã«ç€ºããŸãã
const applyMiddleware = (...middlewares) => (action, setState) => {
middlewares.forEach(middleware => {
action = middleware(action, setState) || action; // Allow middleware to modify/replace the action.
});
setState(action); // This line will always execute and set the final state.
};
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// Middleware functions
const loggerMiddleware = (action) => {
console.log('Action:', action);
return action;
};
const uppercaseMiddleware = (action) => {
if (typeof action === 'string') {
return action.toUpperCase();
}
return action;
};
const asyncMiddleware = (action, setState) => {
if (typeof action === 'function') {
action((newAction) => setState(newAction));
return;
}
return action;
};
const myMiddleware = (action, setState) => {
if (action.type === "API_CALL") {
setTimeout(() => {
setState(action.payload)
}, 1000)
return; //Prevent immediate state change
}
return action;
}
// Custom useActionState hook
const useActionStateWithMiddleware = (initialState, ...middlewares) => {
const [state, setState] = React.useState(initialState);
const dispatch = React.useCallback(
action => {
applyMiddleware(...middlewares)(action, setState);
},
[setState, ...middlewares]
);
return [state, dispatch];
};
// Usage
const MyComponent = () => {
const [message, setMessage] = useActionStateWithMiddleware('', loggerMiddleware, uppercaseMiddleware, asyncMiddleware, myMiddleware);
const updateMessage = (newMessage) => {
setMessage(newMessage);
};
const asyncUpdate = (payload) => (setState) => {
setTimeout(() => {
setState(payload);
}, 2000);
};
const apiCall = (payload) => {
setMessage({type: "API_CALL", payload: payload})
}
return (
Message: {message}
);
};
ãã®ããå æ¬çãªäŸã§ã¯:
loggerMiddlewareãuppercaseMiddlewareãasyncMiddlewareãšããè€æ°ã®ããã«ãŠã§ã¢é¢æ°ããããŸããloggerMiddlewareã¯ã¢ã¯ã·ã§ã³ããã°ã«èšé²ããŸããuppercaseMiddlewareã¯ãã¢ã¯ã·ã§ã³ãæååã®å Žåã倧æåã«å€æããŸããasyncMiddlewareã¯éåæã¢ã¯ã·ã§ã³ãåŠçããŸããã¢ã¯ã·ã§ã³ã颿°ã®å Žåãããããµã³ã¯ã§ãããšã¿ãªããsetState颿°ãæž¡ããŠåŒã³åºããŸããuseActionStateWithMiddlewareããã¯ã¯ãå¯å€æ°ã®ããã«ãŠã§ã¢é¢æ°ãåãå ¥ããããã«ãªããŸãããdispatch颿°ã¯ããã¹ãŠã®ããã«ãŠã§ã¢é¢æ°ã䜿çšããŠapplyMiddlewareãåŒã³åºããŸãã
é«åºŠãªããã«ãŠã§ã¢ã®æŠå¿µ
ãšã©ãŒåŠç
ããã«ãŠã§ã¢ã¯ãšã©ãŒåŠçã«ã䜿çšã§ããŸããããšãã°ããšã©ãŒããã£ããããSentryãRollbarãªã©ã®ãµãŒãã¹ã«ãã°ãèšé²ããããã«ãŠã§ã¢ãäœæã§ããŸãã
const errorHandlingMiddleware = (action, setState) => {
try {
setState(action);
} catch (error) {
console.error('Error:', error);
// Log the error to a service like Sentry or Rollbar
}
};
æ¡ä»¶ä»ãããã«ãŠã§ã¢
ç¹å®ã®æ¡ä»¶äžã§ã®ã¿ããã«ãŠã§ã¢é¢æ°ãé©çšãããå ŽåããããŸããããã¯ãããã«ãŠã§ã¢é¢æ°ãæ¡ä»¶ãã§ãã¯ã§ã©ããããããšã§å®çŸã§ããŸãã
const conditionalMiddleware = (condition, middleware) => (action, setState) => {
if (condition(action)) {
middleware(action, setState);
} else {
setState(action);
}
};
// Usage
const useActionStateWithConditionalMiddleware = (initialState, middleware, condition) => {
const [state, setState] = React.useState(initialState);
const dispatch = React.useCallback(
action => {
if (condition(action)) {
middleware(action, setState);
} else {
setState(action);
}
},
[middleware, setState, condition]
);
return [state, dispatch];
};
const MyComponent = () => {
const [count, setCount] = useActionStateWithConditionalMiddleware(0, loggerMiddleware, (action) => typeof action === 'number');
const increment = () => {
setCount(count + 1);
};
const updateMessage = (message) => {
setCount(message);
};
return (
Count: {count}
);
};
éåæããã«ãŠã§ã¢
åã®äŸã§èŠãããã«ãããã«ãŠã§ã¢ã¯éåæã¢ã¯ã·ã§ã³ãåŠçã§ããŸããããã¯ãAPIåŒã³åºããè¡ã£ããããã®ä»ã®æéã®ãããã¿ã¹ã¯ãå®è¡ãããããã®ã«åœ¹ç«ã¡ãŸãã
const apiMiddleware = (action, setState) => {
if (typeof action === 'function') {
action(setState);
} else {
setState(action);
}
};
// Usage
const MyComponent = () => {
const [data, setData] = useActionStateWithMiddleware(null, apiMiddleware);
const fetchData = () => (setState) => {
fetch('https://api.example.com/data')
.then(response => response.json())
.then(data => setState(data));
};
const handleClick = () => {
setData(fetchData());
};
return (
{data && {JSON.stringify(data, null, 2)}}
);
};
å®éã®äŸ
Reactã¢ããªã±ãŒã·ã§ã³ã§ããã«ãŠã§ã¢ãã€ãã©ã€ã³ãã©ã®ããã«äœ¿çšã§ããããããã€ãã®å®éã®äŸãèŠãŠã¿ãŸãããã
èªèšŒ
ããã«ãŠã§ã¢ã䜿çšããŠèªèšŒãåŠçã§ããŸããããšãã°ãèªèšŒãå¿ èŠãªã¢ã¯ã·ã§ã³ãååãããã°ã€ã³ããŠããªããŠãŒã¶ãŒããã°ã€ã³ããŒãžã«ãªãã€ã¬ã¯ãããããã«ãŠã§ã¢ãäœæã§ããŸãã
const authMiddleware = (action, setState) => {
if (action.type === 'PROTECTED_ACTION' && !isAuthenticated()) {
redirectToLoginPage();
} else {
setState(action);
}
};
ããŒã¿æ€èšŒ
ããã«ãŠã§ã¢ã䜿çšããŠãããŒã¿ãç¶æ ã«ä¿åãããåã«æ€èšŒã§ããŸããããšãã°ããã©ãŒã éä¿¡ãæå¹ãã©ããããã§ãã¯ããæå¹ã§ãªãå Žåã¯ãšã©ãŒã¡ãã»ãŒãžã衚瀺ããããã«ãŠã§ã¢ãäœæã§ããŸãã
const validationMiddleware = (action, setState) => {
if (action.type === 'FORM_SUBMIT') {
const errors = validateForm(action.payload);
if (errors.length > 0) {
displayErrorMessages(errors);
} else {
setState(action.payload);
}
} else {
setState(action);
}
};
ã¢ããªãã£ã¯ã¹
ããã«ãŠã§ã¢ã䜿çšããŠãŠãŒã¶ãŒã€ã³ã¿ã©ã¯ã·ã§ã³ã远跡ããGoogle AnalyticsãMixpanelãªã©ã®ãµãŒãã¹ã«ã¢ããªãã£ã¯ã¹ããŒã¿ãéä¿¡ã§ããŸãã
const analyticsMiddleware = (action, setState) => {
trackEvent(action.type, action.payload);
setState(action);
};
function trackEvent(eventType, eventData) {
// Replace with your analytics tracking code
console.log(`Tracking event: ${eventType} with data:`, eventData);
}
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