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VisualizaçõesHow to filter city as per selected state in reactjs?
I have data in dropdown now I want to filter city as per selected state, how can I do this in reactJs?
Giving Error:-
API Response:-
My code:-
function setSelectedOption(e) {
console.log(e.target.value);
let selectedState = e.target.value;
}
function GetEgyptStates() {
const [egyptData, setEgyptData] = React.useState(null);
React.useEffect(() => {
axios
.get("http://localhost:3000/states-and-districts.json")
.then((response) => {
setEgyptData(response.data);
console.log(response.data)
});
}, []);
if (!egyptData) return null;
return (
<div>
<select onChange={setSelectedOption}>
<option> -- Select State -- </option>
{Object.entries(egyptData.Egypt).map(([key, val]) => (
<option>{key}</option>
))}
</select>
<select>
<option> -- Select City -- </option>
{egyptData.Egypt.selectedState.map((state) => (
<option>{state}</option>
))}
</select>
</div>
);
}ThankYou for your efforts!
3 Respostas
Responde à pergunta0
I think this code can help you **If you want get property with string name you can use setEgyptData[selectedState]
function GetEgyptStates() {
const [egyptData, setEgyptData] = React.useState();
const [cities,setCities]=React.useState([]);
const [selState,setselState]=React.useState([]);
const [selcity,setselcity]=React.useState([]);
function setSelectedOption(e) {
console.log(e.target.value);
let selectedState = e.target.value;
setselState(selectedState)
setCities(setEgyptData[selectedState])
}
React.useEffect(() => {
const fetchData=async ()=>{
let response =await axios
.get("http://localhost:3000/states-and-districts.json");
setEgyptData(response.data);
}
if(!egyptData)
fetchData();
}, [egyptData]);
if (!egyptData) return null;
return (
<div>
<select value={selState} onChange={setSelectedOption}>
<option> -- Select State -- </option>
{Object.entries(egyptData.Egypt).map(([key, val]) => (
<option key={key}>{key}</option>
))}
</select>
<select value={selcity} onChange={({target})=>setselcity(target.value)}>
<option> -- Select City -- </option>
{cities.map((city) => (
<option key={city}>{city}</option>
))}
</select>
</div>
);
}
0
Your setSelectedOption function does not set state to update the UI
For the fix,
You should introduce
const [selectedState, setSelectedState] = useState()
And add it to setSelectedOption
function setSelectedOption(e) {
console.log(e.target.value);
let selectedState = e.target.value;
setSelectedState(selectedState)
}
By the way, egyptData.Egypt.selectedState does not exist in your current code too, you should use egyptData.Egypt[selectedState]
{egyptData.Egypt[selectedState].map((state) => (
<option>{state}</option>
))}
0
seems egyptData.Egypt.selectedState is undefine like @Bravo said
you can do it like egyptData.Egypt.selectedState && egyptData.Egypt.selectedState.map() or egyptData?.Egypt?.selectedState?.map()
it seems like it renders before data your set method call (useEffect)
instead of doing this if (!egyptData) return null try if (!egyptData) return <></>