Array combination of associative key and number in javascript

Question

In short, I have start my question,

I simply read json file,

 [{"FirstCategory":"Bath","SecondCategory":"Bath Accessories","ThirdCategory":""}, {"FirstCategory":"Bath","SecondCategory":"Faucets","ThirdCategory":""},{"FirstCategory":"Bath","SecondCategory":"Fixtures","ThirdCategory":""},{"FirstCategory":"Bath","SecondCategory":"Vanities","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Concrete","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Fencing","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Gypsum","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Insulation","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Insulssdation","ThirdCategory":""}]

and trying to convert into array like

Array
(
  [Bath] => Array
    (
        [Bath Accessories] => Array
            (
                [0] => test
            )

        [Faucets] => Array
            (
                [0] => test1
                [1] => test2
            )

    )

)//sorry i have used PHP for simple formatting the array.

I spent lot of time on this stuff i can't get success please help me.

 My javascript code : (not working.)

 var FirstCategory = [];
 var SecondCategory = [];
 var ThirdCategory = [];


 $.getJSON('tree.json', function(data) {

var dataObj = new Array();
$.each(data,function(i){
    dataObj[data[i].FirstCategory] = new Array();

    if([data[i].SecondCategory] in dataObj[data[i].FirstCategory])
        dataObj[data[i].FirstCategory][data[i].SecondCategory] = data[i].SecondCategory;
    else
        dataObj[data[i].FirstCategory][data[i].SecondCategory] = new Array();

    dataObj[data[i].FirstCategory][data[i].SecondCategory][data[i].ThirdCategory] = new Array();

});

 console.log(dataObj);

/*
$.each(data,function(i){

    if (FirstCategory == '') {
        FirstCategory.push(data[i].FirstCategory);
    }
    else
    {
        if(!FirstCategory.contains(data[i].FirstCategory))
        {
            //root
            FirstCategory.push(data[i].FirstCategory);
        }
        else
        {
            //------- second level category -------//
            if (SecondCategory == '') {
                SecondCategory.push(data[i].SecondCategory);
            }
            else
            {
                if(!SecondCategory.contains(data[i].SecondCategory))
                {
                    SecondCategory.push(data[i].SecondCategory);
                }
                else
                {
                    ThirdCategory.push(data[i].ThirdCategory);
                }
            }

        }
    }   

});
*/

});


Array.prototype.contains = function(obj) {
  var i = this.length;
  while (i--) {
        if (this[i] == obj) {
         return true;
      }
  }
   return false;
}

Thanks in advance.

Is there a reason your json is not already on that form? If not I would suggest changing the backend instead. — Per Salbark
– Per Salbark, Commented Nov 2, 2012 at 13:27
First thing you should do is realize that in JavaScript, what you're making is a plain object, and not an array. — Pointy
– Pointy, Commented Nov 2, 2012 at 13:29
Where did you get those test, test1, test2 values from? — Bergi
– Bergi, Commented Nov 2, 2012 at 13:43

Bergi · Accepted Answer · 2012-11-02 13:38:59Z

2

Please notive that Javascript has no "associative arrays".

A bit more programmatically:

var levels = ["FirstCategory", "SecondCategory", "ThirdCategory"]; // possibly more
var dataObj = {}; // an empty object
for (var i=0; i<data.length; i++) {
    var cur = dataObj;
    for (var j=0; j<levels.length; j++) {
        var key = data[i][levels[j]];
        if (!key) // empty
            break;
        if (key in cur)
            cur = cur[key];
        else
            cur = cur[key] = {};
    }
}

result (dataObj) for your example input, formatted as JSON:

{
    "Bath": {
        "Bath Accessories": {},
        "Faucets": {},
        "Fixtures": {},
        "Vanities": {}
    },
    "Building Materials": {
        "Concrete": {},
        "Fencing": {},
        "Gypsum": {},
        "Insulation": {},
        "Insulssdation": {}
    }
}

answered Nov 2, 2012 at 13:38

Bergi

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Comments

Rudolf Mühlbauer · Accepted Answer · 2012-11-02 13:55:00Z

2

This might do the trick:

input = [{"FirstCategory":"Bath","SecondCategory":"Bath     Accessories","ThirdCategory":""}, {"FirstCategory":"Bath","SecondCategory":"Faucets","ThirdCategory":""},{"FirstCategory":"Bath","SecondCategory":"Fixtures","ThirdCategory":""},{"FirstCategory":"Bath","SecondCategory":"Vanities","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Concrete","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Fencing","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Gypsum","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Insulation","ThirdCategory":""},{"FirstCategory":"Building Materials","SecondCategory":"Insulssdation","ThirdCategory":""}];

function reducer (prev, val) {
    v1 = val["FirstCategory"]
    v2 = val["SecondCategory"]
    if (!(v1 in prev)) { prev[v1] = {}; }
    if (!(v2 in prev[v1])) { prev[v1][v2] = [];}
    prev[v1][v2].push(val["ThirdCategory"]);
    return prev;
}

output = input.reduce(reducer, {});

console.log(input);
console.log(output);

Output:

{ Bath: 
   { 'Bath Accessories': [ '' ],
     Faucets: [ '' ],
     Fixtures: [ '' ],
     Vanities: [ '' ] },
  'Building Materials': 
   { Concrete: [ '' ],
     Fencing: [ '' ],
     Gypsum: [ '' ],
     Insulation: [ '' ],
     Insulssdation: [ '' ] } }

answered Nov 2, 2012 at 13:55

Rudolf Mühlbauer

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2 Comments

Beetroot-Beetroot Over a year ago

Seriously nice solution .... but Caution! Array.reduce() is an ECMAScript 5 addition. Up to date Chrome, FF, Opera, Safari, and IE9 will be OK but IE6/7/8 will need the workaround script. Read all about it here

TheFoxLab Over a year ago

@RudolfMühlbauer : Thanxs dude :)

Beetroot-Beetroot · Accepted Answer · 2012-11-02 14:34:52Z

Try this :

var formattedData = {};
$.each(data, function(i, item) {
    if(!formattedData[item.FirstCategory]) {
        formattedData[item.FirstCategory] = {};
    }
    if(!formattedData[item.FirstCategory][item.SecondCategory]) {
        formattedData[item.FirstCategory][item.SecondCategory] = [];
    }
    formattedData[item.FirstCategory][item.SecondCategory].push(item.ThirdCategory);
});

The resulting object will be of the following structure :

var formattedData = {
    'Bath': {
        'Bath Accessories': [
            'Non-slip Bath Mat'
        ],
        'Faucets': [
            'Brass Fawcet (Pair)',
            'Chrome Fawcet (Pair)',
            'Gold Fawcet (Monoblock)'
        ],
        'Fixtures': [
            'xxx',
            'yyy',
            'zzz'
        ],
        //etc.
        //etc.
    }
};

DEMO

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