so i want to delete an item from array, onClick but when i log the filtered data in the console i get an array of Proxy.
i tried Changing my code but nothing worked
whats wrong here in itemRemoved?
import { createSlice, createAction } from "#reduxjs/toolkit";
// Action Creater
const slice = createSlice({
name: "shoppingCart",
initialState: [],
reducers: {
itemAdded: some code // ,
itemRemoved: (cart, { payload }) => {
cart.filter((item) => {
if (item.id === payload.id) {
if (item.count === 1) {
return cart.filter((item) => item.id !== payload.id);
}
else {
const itemIndex = cart.indexOf(item);
cart[itemIndex].count = cart[itemIndex].count - 1;
return cart;
}
}
});
},
},
});
export const { itemAdded, itemRemoved } = slice.actions;
export default slice.reducer;
Assuming you want to remove the element with the id you are passing through the dispatch function
itemRemoved: (state, { payload }) => {
const newCart = state.cart.filter(item => item.id !== payload.id)
const state.cart = newCart
return state
}),
Related
I get the array of objects coming from backend, I get it with socket.io-client. Here we go!
//App.js
import Tickers from "./Components/TickersBoard";
import { actions as tickerActions } from "./slices/tickersSlice.js";
const socket = io.connect("http://localhost:4000");
function App() {
const dispatch = useDispatch();
useEffect(() => {
socket.on("connect", () => {
socket.emit("start");
socket.on("ticker", (quotes) => {
dispatch(tickerActions.setTickers(quotes));
});
});
}, [dispatch]);
After dispatching this array goes to Action called setTickers in the slice.
//slice.js
const tickersAdapter = createEntityAdapter();
const initialState = tickersAdapter.getInitialState();
const tickersSlice = createSlice({
name: "tickers",
initialState,
reducers: {
setTickers(state, { payload }) {
payload.forEach((ticker) => {
const tickerName = ticker.ticker;
const {
price,
exchange,
change,
change_percent,
dividend,
yeild,
last_trade_time,
} = ticker;
state.ids.push(tickerName);
const setStatus = () => {
if (ticker.yeild > state.entities[tickerName].yeild) {
return "rising";
} else if (ticker.yeild < state.entities[tickerName].yeild) {
return "falling";
} else return "noChange";
};
state.entities[tickerName] = {
status: setStatus(),
price,
exchange,
change,
change_percent,
dividend,
yeild,
last_trade_time,
};
return state;
});
return state;
},
},
});
But the state doesn't change. I tried to log state at the beginning, it's empty. After that I tried to log payload - it's ok, information is coming to action. I tried even to do so:
setTickers(state, { payload }) {
state = "debag";
console.log(state);
and I get such a stack of logs in console:
debug
debug
debug
3 debug
2 debug
and so on.
I am using Alan AI voice assistant, so I am trying to trigger a function from another component based on the voice command.
This is the component holding the function I want to call
const CartButton: React.FC<CartButtonProps> = ({
className,
isShowing,
}) => {
const { openDrawer, setDrawerView } = useUI();
function handleCartOpen() {
setDrawerView('CART_SIDEBAR');
isShowing;
return openDrawer();
}
return (
<button
className={cn(
'flex items-center justify-center',
className
)}
onClick={handleCartOpen}
aria-label="cart-button"
>
</button>
);
};
export default CartButton;
So in the component above I want to use the handleCartOpen function in the below component
const COMMANDS = {
OPEN_CART: "open-cart",
}
export default function useAlan() {
const [alanInstance, setAlanInstance] = useState()
const openCart = useCallback(() => {
alanInstance.playText("Opening cart")
// I want to call the handleCartOpen function here
}, [alanInstance])
useEffect(() => {
window.addEventListener(COMMANDS.OPEN_CART, openCart)
return () => {
window.removeEventListener(COMMANDS.OPEN_CART, openCart)
}
}, [openCart])
useEffect(() => {
if (alanInstance != null) return
const alanBtn = require('#alan-ai/alan-sdk-web');
setAlanInstance(
alanBtn({
key: process.env.NEXT_PUBLIC_ALAN_KEY,
rootEl: document.getElementById("alan-btn"),
onCommand: ({ command, payload }) => {
window.dispatchEvent(new CustomEvent(command, { detail: payload }))
}
}));
}, []);
}
So in the openCart Callback, i want to trigger the handleCartOpen function which is in the first component
I have super simple question
Why my redux state doesn't update immediately?
const { reducer, actions } = createSlice({
name: "professionals",
initialState: {
loading: false,
lastFetchList: undefined,
list: undefined,
professional: undefined,
filters: {
virtual: false
}
},
reducers: {
professionalsListRequested: (professionals, action) => {
if (action.payload.withLoading) professionals.loading = true;
},
professionalsListRequestFailed: (professionals, action) => {
professionals.loading = false;
},
professionalsListReceived: (professionals, action) => {
professionals.lastFetchList = Date.now();
professionals.list = action.payload.data.dataArr;
professionals.loading = false;
},
virtualUpdated: (categories, action) => {
categories.filters.virtual = action.payload;
}
},
});
export const { virtualUpdated } = actions;
export default reducer;
it is my slice.
and here is code of the component :
const dispatch = useDispatch();
const filters = useSelector((state) => state.professionals.filters);
const handlePressOnVirtual = async () => {
console.log("Before" , filters.virtual)
await dispatch(virtualUpdated(!filters.virtual));
console.log("after" , filters.virtual)
};
when handlePressOnVirtual function is called the both console.log(s) print previous value of the state.
When you are still in handlePressOnVirtual function, you are still in a closure, so all the references will still be your existing filters
So you would need to wait for another re-render for useSelector to invoke again then the new values will come.
One way to see the latest changes is to put your log inside a useEffect:
useEffect(() => {
console.log("after" , filters.virtual)
},[filters.virtual]);
Running into an infinite loop when I try to dispatch an action which grabs all recent posts from state.
I have tried the following in useEffect dependency array
Object.values(statePosts)
useDeepCompare(statePosts)
passing dispatch
omitting dispatch
omitting statePosts
passing statePosts
doing the same thing in useCallback
a lot of the suggestions came from here
I have verified that data correctly updates in my redux store.
I have no idea why this is still happening
my component
const dispatch = useDispatch()
const { user } = useSelector((state) => state.user)
const { logs: statePosts } = useSelector((state) => state.actionPosts)
const useDeepCompare = (value) => {
const ref = useRef()
if (!_.isEqual(ref.current, value)) {
ref.current = value
}
return ref.current
}
useEffect(() => {
dispatch(getActionLogsRest(user.email))
}, [user, dispatch, useDeepCompare(stateLogs)])
actionPosts createSlice
const slice = createSlice({
name: 'actionPosts',
initialState: {
posts: [],
},
reducers: {
postsLoading: (state, { payload }) => {
if (state.loading === 'idle') {
state.loading = 'pending'
}
},
postsReceived: (state, { payload }) => {
state.posts = payload
},
},
})
export default slice.reducer
const { postsReceived, postsLoading } = slice.actions
export const getActionPostsRest = (email) => async (dispatch) => {
try {
dispatch(postsLoading())
const { data } = await getUserActionPostsByUser({ email })
dispatch(postsReceived(data.userActionPostsByUser))
return data.userActionPostsByUser
} catch (error) {
throw new Error(error.message)
}
}
Remove dispatch from dependencies.
useEffect(() => {
dispatch(getActionLogsRest(user.email))
}, [user, dispatch, useDeepCompare(stateLogs)])
you cannot use hook as dependency and by the way, ref.current, is always undefined here
const useDeepCompare = (value) => {
const ref = useRef()
if (!_.isEqual(ref.current, value)) {
ref.current = value
}
return ref.current
}
because useDeepCompare essentially is just a function that you initiate (together with ref) on each call, all it does is just returns value. That's where the loop starts.
There is a challenge update existing elements value in json array in redux store by an action creater.
You can run code here also shared it below;
console.clear()
const CreateTeam = (team, point) => {
return {
type:"CREATE_TEAM",
payload: {team, point}
}
}
const UpdateTeam = (team, point) => {
return {
type:"UPDATE_TEAM_POINT",
payload: {team, point}
}
}
const TeamReducer = (state = [], action) => {
if(action.type == "CREATE_TEAM")
{
return [...state, action.payload]
}
if(action.type == "UPDATE_TEAM_POINT")
{
let point=action.payload.point;
return [...state, {
...state.teams,
point:point
}]
}
return state;
}
const { createStore, combineReducers } = Redux;
const league = combineReducers({
teams: TeamReducer
})
const store = createStore(league);
store.dispatch(CreateTeam("TeamA",10));
store.dispatch(CreateTeam("TeamB",20));
store.dispatch(UpdateTeam("TeamA",15));//not work
console.log(store.getState())
create actions works fine, I expected the point value of TeamA set to 15.. but its added new object has only "point" property value 15
There is an error in name of actionTypes:
action dispatches type:"UPDATE_TEAM"
reducer handles action.type == "UPDATE_TEAM_POINT"
You have to perform immutable change, try this:
const TeamReducer = (state = [], action) => {
if(action.type == "CREATE_TEAM")
{
return [...state, action.payload]
}
if(action.type == "UPDATE_TEAM")
{
const {team, point} = action.payload;
const changedIdx = state.findIndex((item) => item.team === team);
return [...state.slice(0, changedIdx), action.payload, ...state.slice(changedIdx + 1)]
}
return state;
}