Javascript length of array in object

Question

I have a Javascript object defined as follows:

var active = {
    waypoints: [],
    scenario: []
}

I push to array scenario with:

var myScenario = {
    id:     terrainId,
    text:   text

}; 

active.scenario.push(myScenario);

However I get 0 when:

console.log(active.scenario.length);

So of course I cannot loop through the array content. If I do:

console.log(active.scenario)

I see the array content within Chrome plus the correct array length. I have similar code that defines and works with arrays, but outside of an object definition.

Most grateful for insight into why length is 0.

Could you please include a jsFiddle that recreated this behavior? — Lix
– Lix, Commented Mar 23, 2014 at 12:11
Are you using a vanilla javascript array or are these actually arrays out of a library like Knockout? — Chris Sainty
– Chris Sainty, Commented Mar 23, 2014 at 12:14

davidkonrad · Accepted Answer · 2014-03-26 00:59:42Z

3

It works fine:

JSFiddle

var terrainId = 1;
var text = "text";

var active = {
    waypoints: [],
    scenario: []
}

var myScenario = {
    id:     terrainId,
    text:   text
}; 

active.scenario.push(myScenario);       

console.log(active.scenario.length);

Looks like the problem is somewhere else.

edited Mar 26, 2014 at 0:59

davidkonrad

85.7k17 gold badges211 silver badges273 bronze badges

answered Mar 23, 2014 at 12:12

sanchez

4,5303 gold badges25 silver badges56 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Grumpybeard Over a year ago

Thanks san.chez, you were right, problem was timing of an ajax call elsewhere. More specifically, it was the asynchronous handling of the "success" function invocation in my ajax call that sets up the array content. From this I learnt I must become familiar with JSFiddle to set up quick tests myself, thanks again.

Collectives™ on Stack Overflow

Javascript length of array in object

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related