add to an array of arrays localstorage code example

Example 1: localsstorage array append element

function addEntry() {
    // Parse any JSON previously stored in allEntries
    var existingEntries = JSON.parse(localStorage.getItem("allEntries"));
    if(existingEntries == null) existingEntries = [];
    var entryTitle = document.getElementById("entryTitle").value;
    var entryText = document.getElementById("entryText").value;
    var entry = {
        "title": entryTitle,
        "text": entryText
    };
    localStorage.setItem("entry", JSON.stringify(entry));
    // Save allEntries back to local storage
    existingEntries.push(entry);
    localStorage.setItem("allEntries", JSON.stringify(existingEntries));
};

Example 2: javascript store array in localstorage

//storing array in localStorage
var colors = ["red","blue","green"];
localStorage.setItem("my_colors", JSON.stringify(colors)); //store colors
var storedColors = JSON.parse(localStorage.getItem("my_colors")); //get them back

Example 3: localstorage save array

var names = [];
names[0] = prompt("New member name?");
localStorage.setItem("names", JSON.stringify(names));

//...
var storedNames = JSON.parse(localStorage.getItem("names"));