只是试图将 6 个数组值存储到 localStorage 中

Question

The array oldData [] holds 6 values. (integer values fetched from api). All I want to do is put these values in 1 localStorage key called 'olddata'.

I've searched everywhere and didn't find anything that make this work. Could please someone help me with a simple solution?

The way I'm trying now:

        let oldData = [];
        oldData.push(parkingData.availableCapacity);
        console.log(oldData); // Definitely holds 6 values 
        localStorage.setItem('olddata', oldData); // Only stores the last value 
        of oldData

Also tried a few loops but didn't succeed.

Answer 1

localStorage only stores strings.

Use JSON.stringify() to set an array as string and JSON.parse() to parse that same string back to array when you retrieve the data

 localStorage.setItem('olddata', JSON.stringify(oldData));

Answer 2

let url = 'https://datatank.stad.gent/4/mobiliteit/bezettingparkingsrealtime.json#';
let percent;
let mainDiv = document.getElementById('mainDiv');


function fetchParkingData() {
fetch(url)
.then((resp) => resp.json())
.then(function(data) {

    mainDiv.innerHTML = "";
    for(let i = 0; i < data.length; i++) {

        let parkingData = {
            name: data[i].name,
            totalCapacity: data[i].parkingStatus.totalCapacity,
            availableCapacity: data[i].parkingStatus.availableCapacity,
        }


        let oldData = [];
        oldData.push(JSON.parse(parkingData.availableCapacity));
        console.log(oldData);
        // console.log(oldData.join());
        localStorage.setItem('dataObject', JSON.stringify(oldData));
    };
})

.catch(function(error) {
    // error handling
    parkingDiv.innerHTML = 'Data could not be fetched';
});
}

Answer 3

Browser console commands and output here:

>let oldData = [];
undefined
>oldData.push('1st Value');
1
>oldData.push('2nd Value');
2
>oldData.push('3rd Value');
3
>console.log(oldData);
(3) ["1st Value", "2nd Value", "3rd Value"]
undefined
>localStorage.setItem('oldData', JSON.stringify(oldData));
undefined
>JSON.parse(localStorage.getItem('oldData'));
(3) ["1st Value", "2nd Value", "3rd Value"]