JavaScript: Adding & Removing objects from array

Question

var layers = {};

//Add new layer
layer.markers = new L.Group();
layer.Name = t;

layers.layer = layer;

Gives an error layers.length is still 'undefined'. Why is it doing that ? I have verified in log that layers contains an item.

Answer 1

layers is not an array. If you want to keep it as an object literal, and check if it's empty, try defining something like this:

Object.isEmpty = function(obj) {
    for (var p in obj)
        if (obj.hasOwnProperty(p)) return false;
    return true;
};

And use

if (!Object.isEmpty(layers)) { ...

instead.

Answer 2

You're not adding to the array. The last line should be:

layers.push(layer);

Answer 3

Simple question. layers is an object not an array .

What you needs to do is replace layers to following.

var layers = new Array();

And replace adding layer code from

layers.layer = layer;

to

layers.push(layer);