我正在实施登录页面使用反应本机和REDX。这是我的减速器的示例代码。有三种类型;类型.SUBMIT_LOGIN,类型.CHANGE_USERNAME,类型.CHANGE_PASSWORD。状态不会改变使用反应减少
CHANGE_USERNAME和CHANGE_PASSWORD工作正常。但问题是SUBMIT_LOGIN。我猜这是因为异步状态的改变。无论如何,使用fetch()方法后改变状态?
export default function login(state = initialState, action = {}) {
switch (action.type) {
case types.SUBMIT_LOGIN: {
let loginStatus = false;
if (state.username != null && state.password != null
&& state.username.length > 0 && state.password.length > 0
&& state.username === state.password) {
loginStatus = true;
} else {
let updatedErrMsg = '';
fetch('https://staging-barrie.mpower.ca/mpower/mpp/weblogin2.action?username='+state.username+'&password='+state.password,
{
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json',
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36',
},
}
)
.then((response) => response.json())
.then((responseJson) => {
if (responseJson.result === 'success') {
loginStatus = true;
} else {
loginStatus = false;
updatedErrMsg = 'Incorrect Username or Password.';
}
return {
...state,
isLoggedIn: loginStatus,
errorMsg: updatedErrMsg
};
});
}
return {
...state,
isLoggedIn: loginStatus
};
}
case types.CHANGE_USERNAME:
return {
...state,
username: action.username
};
case types.CHANGE_PASSWORD:
return {
...state,
password: action.password
};
default:
return state;
}}