How to add new property with same key name inside

Question

How can I append/add new property with same key name inside declared object ?

Here the code:

// Declared object
var myObject = {
    name : 'John',
    age  : 15,
};

// Array list of new property need to be add to myObject
var others = [
  { key : 'hobby', value: 'reading' },
  { key : 'hobby', value: 'writing' }
];

What i've been try so far:

ko.utils.arrayForEach(others, function(other) {
    myObject[other.key] = other.value;
});

and

ko.utils.arrayForEach(others, function(other) {
    var extendObject = new Object();
    extendObject[other.key] = other.value;

    $.extend(myObject, extendObject);
});

The result still both doesn't work either. It just replace existing property value

What I need is something like this:

myObject: { name: 'John', age: 15, hobby: 'reading', hobby: 'writing' }

Please note: I don't want to make it array : hobby: ['reading', 'writing']

UPDATE:

I was implement this for search functionality, code and details above is simplified version of the part I was stuck.

and here is the full code of what i've try to accomplish:

my views:

<form data-bind="submit: $root.getSearchData">
  <input name="date_start" class="datepicker">

  <div class="checkbox">
    <label>
       <input type="checkbox" name="user_id[]" value="1"> John
    </label>
    <label>
       <input type="checkbox" name="user_id[]" value="2"> Michael
    </label>
  </div>
</form>

my viewmodels:

// Will contains new search property need to append to queryData
self.searchPropertyList = ko.observableArray();

// This function will fetch tasks from server
self.getTasksFromServer = function()
{
   // Query data
   var queryData = {
       sort : 'start',
       order: 'asc'
   };

   /**
    * When getSearchData function fill formData into searchPropertyList observable,
    * this function will get a notify and it will automatically loop through it 
    * and append new property to queryData.
    */
   ko.utils.arrayForEach(self.searchPropertyList(), function(opt)
   {
       queryData[opt.name] = opt.value;
   }

   $.ajax({
       url: 'api/tasks',
       type: 'json',
       data: queryData,
       success: function(data)
       {
       }
   });
}

// Returned form property as array into searchPropertyList observableArray 
// and notify getTaskFromServer function
// This is how formData may look like
// formData = [{ name: 'date_start', value: '2014-08-26' }, { name: 'user_id[]', value: 1 }, { name: 'user_id[]', value: 2 }]; 
self.getSearchData = function(form)
{
     var formData = $(form).serializeArray();

     self.searchPropertyList(formData);
}

So, ajax will request something like this:

api/tasks?sort=start&order=asc&date_start=2014-08-26&user_id[]=1&user_id[]=2

Someone, please help, Thanks :)

Answer 1

You cannot add/append same keys with difference values inside an object but you can add and extra key such as below code. By doing this, you can differentiate the same keys :

// Declared object
var myObject = {
    name : 'John',
    age  : 15,
};

// Array list of new property need to be add to myObject
var others = [
  {0 : { key : 'hobby', value: 'reading' }},
  {1 :{ key : 'hobby', value: 'writing' }}
];

Answer 2

Duplicate of

How can I store multiple values per key in a hash table using Node.JS?

You have to use {key, [array]} which is hashmap with array as the value and write custom method to push and pop.

Answer 3

As the comments say, you can not have multiple property with the same name.

What you can do this to add the hobby value to the same hobby property and split it when you need all your hobbies:

var person = { hobby: "programmer" };

// adding another hobby
person.hobby =+ "-secretary";

var hobbies = person.hobby.split("-"); // [programmer,secretary]