Linked Questions

Why this does not work ? if(typeof(localStorage.getItem("username"))=='undefined'){ alert('no'); }; The goal is to redirect the user from the index page to the login page if not already logged. ...

Possible Duplicate: HTML5 localStorage: check if item isset I am developing an Sencha Touch 2 App using the localStorage. I get values from the local storage like this: var localStore = Ext....

Working on a Chrome Extension that allows users to keep a list that uses localStorage. Working so far: user can input things in their list and it will store in localStorage, user can delete things ...

I want to limit the number of clicks on a button per day to 5 clicks using cookies. So when a user clicks 5 times, the button will no longer be clickable. I managed to do that, but the problem is when ...

I am testing to see if a localstorage key exists or not. So first I've done a console.log to see what's inside the value... console.log(localStorage.getItem('mykey')); This returns null So I've ...

I have a localStorage value, which I am getting const marks = JSON.parse(localstorage.getItem('mark')) Now I am trying to make it robust so that if there is no key with mark in localStorage then it ...

I'd like to store a JavaScript object in HTML5 localStorage, but my object is apparently being converted to a string. I can store and retrieve primitive JavaScript types and arrays using localStorage, ...

I have been searching about this many hours still nothing solved my problem:can't check if a key does exist in the localStorage. In my chat application,Once the user opens a new tab, I want to check ...

I need to check if there is any key in localStorage This code did not work if (localStorage.user === undefined) { alert('There is no key!'); }

I'm working with Ionic framework as part of an online course I'm taking to learn AngularJS and a great many other tools useful to a web developer. And, being the sort of advanced beginner type, I'm ...

I have a project on pure javascript,and I was working on saving items to localstorage. I only need to save id, name and image of the item i am saving. My major problem , however is i do not want save ...

Based on this answer I should be using $.inArray, therefore I do: var curPostId = $(".my_post_id").attr("data-id"); if($.inArray(curPostId, lines)) { $('#'+localStorage.getItem('saveButton')).attr(...

var bookobj = { Name: name, Author: author, Edition: edi, Price: pri } var arr = []; if(localStorage === null){ localStorage.setItem("Arrayobj", JSON.stringify(bookobj)); } else { ...

I painted this picture to demonstrate what my final goal is. Short description: If nothing is changed in form or there's already exact same values saved, "save values" button does nothing If something ...

I have a pop up tutorial (basically slider) that will show upon first launch in the app. This is what I wrote in the controller.js //show first time tutorial if(localStorage.getItem("second") != "...