Cannot setstate in nested axios post request in react - reactjs

Question

I am trying to access the res.data.id from a nested axios.post call and assign it to 'activeId' variable. I am calling the handleSaveAll() function on a button Click event. When the button is clicked, When I console the 'res.data.Id', its returning the value properly, but when I console the 'activeId', it's returning null, which means the 'res.data.id' cannot be assigned. Does anyone have a solution? Thanks in advance
const [activeId, setActiveId] = useState(null);
useEffect(() => {}, [activeId]);
const save1 = () => {
axios.get(api1, getDefaultHeaders())
.then(() => {
const data = {item1: item1,};
axios.post(api2, data, getDefaultHeaders()).then((res) => {
setActiveId(res.data.id);
console.log(res.data.id); // result: e.g. 10
});
});
};
const save2 = () => {
console.log(activeId); // result: null
};
const handleSaveAll = () => {
save1();
save2();
console.log(activeId); // result: again its still null
};
return (
<button type='submit' onClick={handleSaveAll}>Save</button>
);

Answer 1

Setting the state in React acts like an async function.
Meaning that the when you set the state and put a console.log right after it, like in your example, the console.log function runs before the state has actually finished updating.
Which is why we have useEffect, a built-in React hook that activates a callback when one of it's dependencies have changed.
Example:
useEffect(() => {
console.log(activeId);
}, [activeId);
The callback will run every time the state value changes and only after it has finished changing and a render has occurred.
Edit:
Based on the discussion in the comments.
const handleSaveSections = () => {
// ... Your logic with the `setState` at the end.
}
useEffect(() => {
if (activeId === null) {
return;
}
save2(); // ( or any other function / logic you need )
}, [activeId]);
return (
<button onClick={handleSaveSections}>Click me!</button>
)

Answer 2

As the setState is a async task, you will not see the changes directly.
If you want to see the changes after the axios call, you can use the following code :
axios.post(api2, data, getDefaultHeaders())
.then((res) => {
setActiveId(res.data.id)
console.log(res.data.id) // result: e.g. 10
setTimeout(()=>console.log(activeId),0);
})
useEffect(() => {
}, [activeId]);
const [activeId, setActiveId] = useState(null);
const save1 = () => {
const handleSaveSections = async () => {
activeMetric &&
axios.get(api1, getDefaultHeaders()).then(res => {
if (res.data.length > 0) {
Swal.fire({
text: 'Record already exists',
icon: 'error',
});
return false;
}
else {
const data = {
item1: item1,
item2: item2
}
axios.post(api2, data, getDefaultHeaders())
.then((res) => {
setActiveId(res.data.id)
console.log(res.data.id) // result: e.g. 10
})
}
});
}
handleSaveSections()
}
const save2 = () => {
console.log(activeId); //correct result would be shown here
}
const handleSaveAll = () => {
save1();
save2();
}
return (
<button type="submit" onClick={handleSaveAll}>Save</button>
)