Iterating over the local storage to locate a specific item

Question

Iterating over the local storage to locate a specific item

Utilizing local storage extensively has been beneficial for maintaining state by storing the session on the client side. However, a challenge arises when updating the session.

Within my code, there are multiple lists of objects that I serialize in JSON format and store in the session. These objects contain various properties such as an ID and a date. At one point in the application, it is necessary to iterate through these lists to determine if a specific object with a certain ID exists within any of them.

The naming convention for the key used to store the JSON data includes a date component, like so:

var TheData = JSON.stringify(TheListOfMyObjects);
var SessionKey = 'TheListOfObjectsFor' + TheMonth + "." + TheDay + "." + TheYear;
localStorage.setItem(SessionKey, TheData);

Now comes the task of searching for an object by its ID without knowing the corresponding date property. Additionally, there is uncertainty regarding which dates have associated values stored in the session.

Is there a method to locate the object based solely on its ID? It would be helpful if the session data could be loaded into memory for easier iteration.

javascript local-storage

Answer 1

Answer №1

To locate a specific ID within an object, you would have to iterate through each localStorage object and compare their respective fields.

var data1 = {ID  : "x",  value: 123}
var data2 = {ID  : "y",  value: 456}
var data3 = {ID  : "z",  value: 789}

localStorage.setItem("dataEntry1", JSON.stringify(data1));
localStorage.setItem("dataEntry2", JSON.stringify(data2));
localStorage.setItem("dataEntry3", JSON.stringify(data3));

var targetID = "y";

for(var j = 0; j < localStorage.length; j++) {

    var item = JSON.parse(localStorage.getItem(localStorage.key(j)));

    if(item.ID == targetID) {
        console.log(item);
        break;
    }
}

Answer 2

To locate a specific ID within an object, you would have to iterate through each localStorage object and compare their respective fields.

var data1 = {ID  : "x",  value: 123}
var data2 = {ID  : "y",  value: 456}
var data3 = {ID  : "z",  value: 789}

localStorage.setItem("dataEntry1", JSON.stringify(data1));
localStorage.setItem("dataEntry2", JSON.stringify(data2));
localStorage.setItem("dataEntry3", JSON.stringify(data3));

var targetID = "y";

for(var j = 0; j < localStorage.length; j++) {

    var item = JSON.parse(localStorage.getItem(localStorage.key(j)));

    if(item.ID == targetID) {
        console.log(item);
        break;
    }
}

Iterating over the local storage to locate a specific item

Answer №1

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