How to get specific object-elements from JSON-array into JavaScript-array

Question

I have an external JSON-file. It looks like this:

{
"type":"FeatureCollection",
"totalFeatures":1,
"features":
    [{ 
    "type":"Feature",
    "id":"asdf",
    "geometry":null,
    "properties":
        {
        "PARAM1":"19 16 11",
        "PARAM2":"31 22 11",
        "PARAM3":"12 10 7",
        }
    }],
"crs":null
}`

As I think "features" is an JSON-array and "properties" an object of this array. I stuck at trying to "push" the element "PARAM1" into another array in my JS-code. My attempt was to get the data via jQuery AJAX. It looks like this:

function (){
var arrPARAM1 = new Array ();
$.ajax({
    async: false,
    url: 'gew.json',
    data: "",
    accepts:'application/json',
    dataType: 'json',
    success: function(data) {
        arrPARAM1.push(data.features);
    }
})
console.log(arrPARAM1);
}

With arrPARAM1.push(data.features) I can "push" the whole array "features" into my JS-array. But I only want to have the element "PARAM1" from the object "properties". How can I get deeper (features --> properties --> PARAM1)?

Thanks for your attention!

SOLUTION:

arrPARAM1.push(data.features[0].properties.PARAM1);

never set async to false....its even deprecated (and has been for awhile) — Jared Smith
– Jared Smith, Commented Oct 21, 2015 at 18:00

Spencer Wieczorek · Accepted Answer · 2015-10-21 17:59:15Z

4

It's just an array with a single element so access [0] then .properties

arrPARAM1.push(data.features[0].properties.PARAM1);

answered Oct 21, 2015 at 17:59

Spencer Wieczorek

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Comments

nousernamesremained · Accepted Answer · 2015-10-21 18:02:03Z

1

You would be looking for something like this:

data.features[0].properties["PARAM1"]

Or

data.features[0].properties.PARAM1

answered Oct 21, 2015 at 18:02

nousernamesremained

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Comments

Aaron C · Accepted Answer · 2015-10-21 18:02:09Z

0

You defined features as an array so when you access is, you must treat it as an array.

arrPARAM1.push(data.features[0].properties.PARAM1); //gets param1 from the features array

answered Oct 21, 2015 at 18:02

Aaron C

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Comments

Shanoor · Accepted Answer · 2015-10-21 18:13:18Z

0

In case you have multiple features:

data.features.forEach(function(feature) {
    arrPARAM1.push(feature.properties.PARAM1);
})

answered Oct 21, 2015 at 18:13

Shanoor

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