In creating an if/then statement in js, how do I test for data in an array?

Question

In Chrome console, this is what my array looks like when it has no data:

Object {Series1: Array[0]}

When it has data, it looks like this:

Object {Series1: Array[10]}

I tried this out but didn't have any luck:

function testfunction() {
    if (array[Series1] !== 'undefined' && array[Series1] !== null) {
        alert("There is data");
    } else {
        alert("No data here");
    }
};

$(document).ready(testfunction);

1 - You dont have an array, you have an object that contains an array. 2 - possible duplicate of [How do I check if a (javascript) array value is empty or null](http://stackoverflow.com/questions/2672380/how-do-i-check-if-a-javascript-array-value-is-empty-or-null). — Craicerjack, Jul 15 '15 at 15:40
Any idea how to test that the object has data based on the above example? — John McCoy, Jul 15 '15 at 19:18

score 3 · Accepted Answer · answered Jul 15 '15 at 15:38

3

Test the length of the array for an empty array:

if (array.Series1 && array.Series1.length) {
    //Populated
}

Also, unless Series1 in your sample was a variable, it has to be quoted for bracket notation.

answered Jul 15 '15 at 15:38

tymeJV

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It is a variable. How do I quote the variable? – John McCoy Jul 15 '15 at 17:52
You don't quote the variable, you use bracket notation like you werr – tymeJV Jul 15 '15 at 18:04
Ah, gotcha. Tried it and I get this error: "Uncaught ReferenceError: array is not defined" – John McCoy Jul 15 '15 at 18:15
Well I assumed `array` was the variable name for your object (since that what your sample used) – tymeJV Jul 15 '15 at 18:16

In creating an if/then statement in js, how do I test for data in an array?

1 Answers1