CODEWITHSUNDEEP
javascript
Oğuz Çelikdemir
Oğuz Çelikdemir

Reputation: 4980

Adding key value beginning of an array

I would like to add a key->value pair beginning of the a javascript JSON array like so :

var temp = new Array();
temp = {
          ['LABEL_ID': 10, 'LABEL_TYPE': A3],
          ['LABEL_ID': 17, 'LABEL_TYPE': A6]
       }

what I want to do :

var temp = new Array();
temp = {
          'PAPER': A80 
               ['LABEL_ID': 10, 'LABEL_TYPE': A3],
               ['LABEL_ID': 17, 'LABEL_TYPE': A6]
       }

could you please help me?

EDIT here is the my code:

// returns paper type from selected grid line
var ppt     = Ext.getCmp('labelType').getValue();

// returns selected grid rows
var rows    = Ext.getCmp('labelGrids').getSelectionModel().getSelection();


// here is my array that I want to add ppt variable value to existing array, then I will convert this to a JSON array
for (var i = 0; i < count; i++)
{
   prints[i] = {'LABEL_ID': rows[i].data.LABEL_ID, 'LABEL_TYPE':rows[i].data.LABEL_TYPE}
}

The reason is to adding ppt value beginning of the array just I need ones this record in server side. Therefore, I don't want to repeat in all lines!

Upvotes: 2

Views: 258

Answers (5)

Akhil Sekharan
Akhil Sekharan

Reputation: 12683

Well, I hope you meant this script in your question:

And to answer your edited question, A simple way is to wrap it in another object:

var temp = new Array();
temp = [
  {"LABEL_ID": 10, "LABEL_TYPE": "A3"},
  {"LABEL_ID": 17, "LABEL_TYPE": "A6"}
       ]
 // wrap temp in another object;

 var obj = {};
 obj.PAPER = A80;
 obj.Data = temp;
 //And convert to json.
 console.log(JSON.stingify(obj));

Output:

{"PAPER":"A80","Data":[{"LABEL_ID":10,"LABEL_TYPE":"A3"},{"LABEL_ID":17,"LABEL_TYPE":"A6"}]}

Hope this helps. Calling the function will add the required proptery to your objects

var temp = new Array();
temp = [
  {"LABEL_ID": 10, "LABEL_TYPE": "A3"},
  {"LABEL_ID": 17, "LABEL_TYPE": "A6"}
       ]

  addPaperProperty(temp, 'PAPER', ['AA','BB']);

  function addPaperProperty(currentArray, newPropertyField, newPropertyArr){
    var newArray = [];
    var i=0;
    $(temp).each(function(){
       this[newPropertyField] = newPropertyArr[i++];
      newArray.push(this);
    });
    console.log(newArray);
    return newArray;
  }

And the result will be

[{LABEL_ID: 10, LABEL_TYPE: "A3", PAPER: "AA"},
{LABEL_ID: 17, LABEL_TYPE: "A6", PAPER: "BB"}]

Upvotes: 2

Henrik Andersson
Henrik Andersson

Reputation: 47182

If you're so inclined I would say this is the way to go for you.

You're javascript syntax is invalid as it is. You want to add "label"-objects to your Array and furthermore youre assigning temp to a new object overwriting the Array you just created.

If you wanna add to the array you have to use the method .push()

Like this:

labelArray.push({'LABEL_ID': '10', 'LABEL_TYPE': 'A3'});
labelArray.push({'LABEL_ID': '17', 'LABEL_TYPE': 'A6'});

Otherwise this might the a pointer in the right direction

var labelArray = new Array({'LABEL_ID': 10, 'LABEL_TYPE': A3},
               {'LABEL_ID': 17, 'LABEL_TYPE': A6});
var paper = {

    papertype : A80,
    labels : labelArray

}

But its neither good nor is it clean but it works for you.

Upvotes: 2

Shadow Wizard
Shadow Wizard

Reputation: 66388

This is not an array. The type of such a variable is known as hashtable as it defines key/value pairs.

Some important points before the actual answer:

  • Both key and value can be of any type, but good practice is to have the keys as plain strings.
  • The value can be anything, including plain arrays and even another hashtable.
  • You can't have just a key without a value.

So, to make your code valid you can have such a thing:

temp = {
    'PAPER': 'A80', 
    'LABELS': [{'LABEL_ID': 10, 'LABEL_TYPE': 'A3'}, 
               {'LABEL_ID': 17, 'LABEL_TYPE': 'A6'}]
};

This will add ordinary key/value pair then a key with the value being array of hashtables.

To access specific label you can have such code:

var id = temp["LABELS"][1]["LABEL_ID"];

Keep in mind that JavaScript is case sensitive so case is important in the key names, meaning temp["paper"] will return undefined.

Live test case.

Upvotes: 1

Cerbrus
Cerbrus

Reputation: 72867

Your objects appear to be invalid all over the place: The outer brackets should be square: [ ], if you really want it to be an array, and the inner ones curly { }, since those are objects.

Also, unless A3 and A6 are varialbes you've defined before, you'll need to enclose them in apostrophes, since they're strings:

var temp = [
    {'LABEL_ID': 10, 'LABEL_TYPE': 'A3'},
    {'LABEL_ID': 17, 'LABEL_TYPE': 'A6'}
]

Now, if you want that added property in your array, you're probably best off doing it like this:

var temp = [
    {'PAPER': 'A80'},
    {'LABEL_ID': 10, 'LABEL_TYPE': 'A3'},
    {'LABEL_ID': 17, 'LABEL_TYPE': 'A6'}
]

Or, make temp a object, instead:

var temp = {
    'PAPER':'A80',
    'labels':[
        {'LABEL_ID': 10, 'LABEL_TYPE': 'A3'},
        {'LABEL_ID': 17, 'LABEL_TYPE': 'A6'}
    ]
}

(In objects, you always have a key:value relation, in arrays, you never have that.

Upvotes: 1

Jan Wiemers
Jan Wiemers

Reputation: 341

Hi this is a valid JSON Object

temp = {
      'PAPER': A80, 'LIST' : {
           ['LABEL_ID': 10, 'LABEL_TYPE': A3],
           ['LABEL_ID': 17, 'LABEL_TYPE': A6]
       }
   }

Upvotes: -1

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