"Removing an item from an array stored in localstorage: A step-by-step guide

Question

"Removing an item from an array stored in localstorage: A step-by-step guide

I need to remove an object from an array and also delete it from local storage. I have attempted to use the splice method but am struggling with how to implement it correctly. Below is the code that I have tried:

 var details = [];

function addEntry() {
   var existingEntries = JSON.parse(localStorage.getItem("allEntries"));
   if (existingEntries == null) existingEntries = [];
   
   // Code for adding a new entry to the array and updating local storage
   
   showEntry();
}

function showEntry() {
   // Code for displaying entries in a table format
   
   // Looping through local storage entries
}

// Other validation functions and event handlers...

function deleteEntry(id) {
   // Code for deleting an entry from the array and updating local storage
}

function clearstorage() {
   localStorage.clear();
   window.location.reload();
}

window.onload = function() {
   showEntry();
};

javascript local-storage

Answer 1

Answer №1

When you call the deleteEntry function, a new item in localStorage called 'entry' is being set. This means that 'allEntries' is not being updated, which may be why it's appearing incorrectly. Make sure to set all entries again by using localStorage.setItem('allEntries', JSON.stringify(entry));

Don't forget to include the '?' for your variable 'entry'...

Here's how it should look: var entry = localStorage.getItem('allEntries') ? JSON.parse(localStorage.getItem('allEntries')) : []; <-- just like this.

This is essentially an 'if else statement'

function deleteEntry(id){
    console.log("aaaaaaaaaaaaaaAAAA");

      var entry = localStorage.getItem('allEntries') ? JSON.parse(localStorage.getItem('allEntries')) : [];
        var index;
        for (var i = 0; i < entry.length; i++) {
            if (entry[i].id === id) {
              index=i;
              break;
            }
        }
        if(index === undefined) return 
        entry.splice(index, 1);
        localStorage.setItem('allEntries', JSON.stringify(entry)); <--- ensure it looks like this

    }

Answer 2

When you call the deleteEntry function, a new item in localStorage called 'entry' is being set. This means that 'allEntries' is not being updated, which may be why it's appearing incorrectly. Make sure to set all entries again by using localStorage.setItem('allEntries', JSON.stringify(entry));

Don't forget to include the '?' for your variable 'entry'...

Here's how it should look: var entry = localStorage.getItem('allEntries') ? JSON.parse(localStorage.getItem('allEntries')) : []; <-- just like this.

This is essentially an 'if else statement'

function deleteEntry(id){
    console.log("aaaaaaaaaaaaaaAAAA");

      var entry = localStorage.getItem('allEntries') ? JSON.parse(localStorage.getItem('allEntries')) : [];
        var index;
        for (var i = 0; i < entry.length; i++) {
            if (entry[i].id === id) {
              index=i;
              break;
            }
        }
        if(index === undefined) return 
        entry.splice(index, 1);
        localStorage.setItem('allEntries', JSON.stringify(entry)); <--- ensure it looks like this

    }

Answer 3

Answer №2

One way to update localStorage is by creating a temporary object and then replacing the existing data with it.

 function removeEntry(id){
    console.log("aaaaaaaaaaaaaaAAAA");

      var entry = JSON.parse(localStorage.getItem('allEntries'));
        var temp= [];
        for (var i = 0; i < entry.length; i++) {
            if (entry[i].id !== id) {
              temp.push(entry[i]);
            }
        }
        localStorage.setItem('entry', JSON.stringify(temp));
    }

Answer 4

One way to update localStorage is by creating a temporary object and then replacing the existing data with it.

 function removeEntry(id){
    console.log("aaaaaaaaaaaaaaAAAA");

      var entry = JSON.parse(localStorage.getItem('allEntries'));
        var temp= [];
        for (var i = 0; i < entry.length; i++) {
            if (entry[i].id !== id) {
              temp.push(entry[i]);
            }
        }
        localStorage.setItem('entry', JSON.stringify(temp));
    }

"Removing an item from an array stored in localstorage: A step-by-step guide

Answer №1

Answer №2

Similar questions

Node.js routing issues leading to rendering failures

refresh polymer components or make an ajax request within a custom element

Retrieving the contents of a unique 404 error page using ajax

Alter the hue of a component upon being clicked

Analyzing Dynamic Content

Guide to triggering React Material-UI modal and filling it with data from an Ajax request when a button is clicked

Develop a custom directive that incorporates ng-model and features its own distinct scope

Running npm commands from the root directory while the package.json file is located elsewhere

Error message: The md-autocomplete function is throwing a TypeError because it cannot read the property 'then' of an undefined object

Preventing commits when encountering build or lint errors

Utilizing a child component in React to trigger a function on its sibling component

Implementing a play and pause button functionality for the carousel in Bootstrap 5

What is the procedure for defining the secret code for a private key in saml2-js?

Developing a custom logging middleware with morgan

transform constant values into API requests using React

What is the best way to toggle between rendering two components or updating two outlets based on a route in React Router?

Using dynamic import to pull in the map from an npm package.json in JavaScript

Understanding how to efficiently map through FontAwesome icons using React TypeScript and effectively showcase them on the frontend

Navigating using Backbone Marionette URL to Server Endpoint

How do I execute 2 functions when the button is clicked?