javascript empty array inside an object

Question

I've got an object like this:

var obj = {
    age:["23"],
    part:["0"],
    race:[],
    state:["AL"],
    gender:["1"],
    county:["9999"],
    consent:["9999"]
};

I pass this object to php for processing, but race[] is not passed to php along with everything else. How do I change race so it gets sent and has a value of ""?

EDIT: Any one of those (age, part, race, …) could be empty, so I need a way to check and then change.

I've used this code to loop thru the object/array: http://jsfiddle.net/jshado1/wLZMH/

How are you passing it to PHP? Also, is there any reason why all of your object values are 1-length arrays? — fluffy
– fluffy, Commented Jan 9, 2012 at 21:50
@fluffy: via jQuery AJAX. Race can have multiple values, ex race:["asian","black","white"] — Jakob Jingleheimer
– Jakob Jingleheimer, Commented Jan 9, 2012 at 21:55
It's normal for the jQuery parameter serialiser (and browsers in general) to omit unfilled fields - you should fix your PHP script to anticipate that. — Alnitak
– Alnitak, Commented Jan 9, 2012 at 21:57
I wrote my own serialiser because I needed more complex output. — Jakob Jingleheimer
– Jakob Jingleheimer, Commented Jan 9, 2012 at 22:17

fmsf · Accepted Answer · 2012-01-09 21:53:49Z

2

Just do:

if(obj.race!==undefined && obj.race.length===0){
   obj.race = [""];
}

Or:

if(obj.race!==undefined && obj.race.length===0){
   obj.race.push("");
}

EDIT:

For all elements

for(var key in obj){
 if(obj[key]!==undefined && obj[key].length===0){
     obj[key] = [""];
 }
}

answered Jan 9, 2012 at 21:53

fmsf

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1 Comment

Jakob Jingleheimer Over a year ago

Thanks! btw when I wrote it, I had obj[key].length < 1 and it didn't work.

Martin Bean · Accepted Answer · 2012-01-09 22:56:28Z

1

I'm not sure why you've marked it up in that way. If you're passing key–value pairs to PHP, then it should look as follows:

var obj = {
    age: "23",
    part: "0",
    race: {
        "Value 1",
        "Value 2"
    },
    state: "AL",
    gender: "1",
    county: "9999",
    consent: "9999"
};

That way, each value would be passed to PHP (as it's a string, despite being empty).

edited Jan 9, 2012 at 22:56

answered Jan 9, 2012 at 21:56

Martin Bean

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6 Comments

Jakob Jingleheimer Over a year ago

they are arrays because race could have multiple values.

Martin Bean Over a year ago

You'd probably be better passing an object rather than an array then, as modified above.

Jakob Jingleheimer Over a year ago

Functionally, what's the difference between this and the array I have?

Martin Bean Over a year ago

Arrays are for numerically indexed data, objects are for non-numeric keys. Plus, objects are more extendable.

Martin Bean Over a year ago

No. "23" is a string, as it's surrounded by quotes (it probably should be an integer). The value for race is an object, as it's wrapped in curly braces ('{' and '}').

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