Adding more than one localStorage Array to an normal Array

Question

Hello guys I have a question. I have made a calendar and everything works, but the last requirement is to add dates through localStorage.

So my question: how can I add more dates without overwriting the first one?
I was thinking about getting the data out, add the new testObject, and put it back to localStorage. The only thing is I have no clue how to do it.

I hope someone can help. ( I am quite a beginner )

So in short, I want to put more than one array into the events-array through localStorage.

This is my code:

<script language="JavaScript" type="text/javascript" >
    testObject = ["Y", prompt("maand"), prompt("dag"), "2000", prompt("test"), prompt("test")]
    retrievedObject = localStorage.getItem('testObject');

    // Put the object into storage
    localStorage.setItem('testObject', JSON.stringify(testObject))



events = new Array(
          JSON.parse(retrievedObject),
        ["Y",   "1",    "1",    "2000",     "Nieuw jaars dag",  "De eerste dag van het nieuw Jaar"],
        ["Y",   "7",    "3",    "2000",     "Mijn verjaardag", "beste dag van het jaar"],
        ["Y",   "17",   "10",   "2000",     "Inleverdag",   "Ergste dag van het jaar."]
    );
</script>

Edit : after I add 2 arrays it should Work like this But the upper 2 values should be retrieved form local storage and if I add another one it should be 3 arrays in the local storage. But the local storage overwrites itself everytime So at the moment I am only able to add 1 array

events = new Array(
        ["Y",   "1",    "2",    "2000",     "test", "test"],

         ["Y",  "2",    "4",    "2000",     "test2",    "test3"],
        ["Y",   "1",    "1",    "2000",     "Nieuw jaars dag",  "De eerste dag van het nieuw Jaar"],
        ["Y",   "7",    "3",    "2000",     "Mijn verjaardag", "beste dag van het jaar"],
        ["Y",   "17",   "10",   "2000",     "Inleverdag",   "Ergste dag van het jaar."]
    );

What do expect the value of events to be? Can you edit the question and output the computed value you'd like to see? — Sukima
– Sukima, Commented Oct 30, 2014 at 23:03

Sukima · Accepted Answer · 2014-10-31 16:56:57Z

I think the confusion is in your wording, Your asking how to add data to an array but the code examples you provide don't do any adding at all.

I think what your after is Array.prototype.push and Array.prototype.concat.

In an effort to show and example I will make the following assumptions of what you want to do:

// Helper to easily create a new test object
function buildTestObject() {
  return [
    'Y',
    prompt('maand'),
    prompt('dag'),
    '2000',
    prompt('test'),
    prompt('test')
  ];
}

// Pull in the old value from localStorage
var retrievedObject = localStorage.getItem('testObjects') || '[]';

try {
  // Turn JSON into JS Object
  retrievedObject = JSON.parse(retrievedObject);
} catch (e) {
  retrievedObject = [];
}

// Actually add a testObject to the array which will be stored in localStorage
retrievedObject.push(buildTestObject());

// Save the now mutated array of testObjects back into localStorage
localStorage.setItem('testObject', JSON.stringify(retrievedObject))

var events = retrievedObject.concat(
  ["Y",   "1",    "1",    "2000",     "Nieuw jaars dag",  "De eerste dag van het nieuw Jaar"],
  ["Y",   "7",    "3",    "2000",     "Mijn verjaardag", "beste dag van het jaar"],
  ["Y",   "17",   "10",   "2000",     "Inleverdag",   "Ergste dag van het jaar."]
);

This helps alot only one problem the events that are already in the list stopped working any idea why?
I fixed it thank you Thank you !. Because of you I completed the course on school

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