Question

I try playerNameArray.length = 0; this doesn’t empty the array, it makes those values be undefined.

I try playerNameArray = []; this doesn’t empty the array, it makes those values be undefined.

I try var playerNameArray = new Array (); this doesn’t empty the array, it makes those values be undefined.

Maybe the problem is the initial array is public and i try to empty them inside of functions?

Maybe the problem is I need that array to be public in my JavaScript because on my html page I pass the array in a function and the page wont recognize the array if I initialize it inside the function I use it?

I add each array object to a database, but a user should be able to create a new array after inserting the first one. I tried to cheese my insert statement and said if the array element != ‘undefined’ then insert it but it completely ignored that and inserted the undefined.

any suggestions please?

the code is as follows:

var createListCounter = 0;
var playerID = new Array();
var playerNameArray = new Array();

function addToList(espnPlayerID, playerName) {
    playerID[createListCounter] = espnPlayerID; playerNameArray[createListCounter]                =playerName;
    createListCounter++
    var url = "";
    $('#accumListPlayer').append('<tr><td>'+ playerName + '</td></tr>');
}

then on a button click i iterate through that array and save it t oa db. once that completes, i need the array to have nothing in it. if i still have the original objects in it, they write to the database again.

Answer 1

Setting it equal to [] or new Array() overwrites the current value with a blank array.

If you are looping the array you can check if it has any elements by testing its length:

if(playerNameArray.length > 0) // has at least one element

You can also test individual elements of the array using the typeof function:

if(typeof(playerNameArray[3]) == 'undefined')
{
    // element 3 is undefined
}