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I have List of items data and empty array quotations :

   var data = {};
   var quotations = [];

I want to fill quotations with data values ,Every time i add new data it added successfully but all data values get last value .

for example :

 $("#addquotation").click(function () {
        debugger;
        var itemname = $("#itemname").val();
        var cost =parseFloat( $("#cost").val());
        var notes = $("#notes").val();
        var date = $("#date").val();


        data.Item = itemname;
        data.Cost = cost;
        data.Notes = notes;
        data.Date = date;

        quotations.push(data);
)};

for first time i add

"test,45,testnotes,2016-02-03" Second time i 've added "test2,45.2,testnotes2,2016-02-05"

when i debug i get data as :

obj(0): "test2,45.2,testnotes2,2016-02-05" obj(1):"test2,45.2,testnotes2,2016-02-05"

it seems it append last version to all data

Please Advice . Thanks

You need to declare data inside the click handler, if it's declared as a global variable you are basically always modifying and adding the same data object to the array:

var quotations = [];

$("#addquotation").click(function () {
        debugger;
        var data = {};
        var itemname = $("#itemname").val();
        var cost =parseFloat( $("#cost").val());
        var notes = $("#notes").val();
        var date = $("#date").val();


        data.Item = itemname;
        data.Cost = cost;
        data.Notes = notes;
        data.Date = date;

        quotations.push(data);
)};

Push values to array in jquery, You need to declare data inside the click handler, if it's declared as a global variable you are basically always modifying and adding the same  In this example, i will let you know how to push specific key with value as array in jquery array. we can add dynamically push key value pair in jquery array. As we know if we use push method into an array then you can not specify key for value. it will create automatically 0 1 2 3 etc, but if you want to push both key and value then you can not specify key, but in this example i will show you how to create array with specific key value.

You are pushing the same object reference each time since you declared data outside of the click handler.

Change from :

var data={};
$("#addquotation").click(function () {

To

$("#addquotation").click(function () {
     var data={};// declare local variable

Pushing value of Var into an Array, jQuery is not the same as an array. If you want to append something at the end of a jQuery object, use: $('#fruit')  Today, We want to share with you JQuery Push Key And Value Into An Array.In this post we will show you javascript array push key value pair dynamically, hear for how to push both key and value into an array in javascript we will give you demo and example for implement.In this post, we will learn about Push Both Key And Value Into An Array In

The problem is that data is a global variable and you add a reference to data to quotations.

When the first value is pushed to quotations, data and quotations[0] refer to the same object. Here is an example of what is happening:

var a = {num: 1};
var b = a;
b.num = 2;
console.log(a.num); // prints 2

The same thing happens when an object is pushed to an array. quotations does not contain a copy of data, it contains a reference to data so that modifying data also modifies quotations. To fix this, each element of quotations must refer to a different data object. This can be accomplished by defining data inside of the function instead of outside.

Replace

var data = {};
$("#addquotation").click(function() {
    // populate data, push to quotations
});

with

$("#addquotation").click(function() {
    var data = {};
    // populate data, push to quotations
});

How to push an object into an Array?, I tried the following code to push values into array and "keeping" them as objects, but I'm getting syntax errors. How can I push these objects  When the first value is pushed to quotations, data and quotations[0] refer to the same object. Here is an example of what is happening: var a = {num: 1}; var b = a; b.num = 2; console.log(a.num); // prints 2 The same thing happens when an object is pushed to an array.

JQuery, we can add dynamically push key value pair in jquery array. As we know if we use push method into an array then you can not specify key for  jQuery is not the same as an array. If you want to append something at the end of a jQuery object, use: $('#fruit').append(veggies); or to append it to the end of a form value like in your example: $('#fruit').val($('#fruit').val()+veggies); In your case, fruitvegbasket is a string that contains the current value of #fruit, not an array.

JavaScript Array push() Method, Return value: This method returns the new length of the array after inserting the arguments into the array. Below examples illustrate the JavaScript Array push()  Your code alerts the current value of the dropdown for me, showing that it has properly pushed into the array. Are you wanting to keep old values and append? You're recreating the array each time, meaning that the old value gets clobbered. Here's some updated code:

How to append an element in an array in JavaScript?, If you need to add an element or multiple elements to the end of an array, the push() method will almost always be your simplest and quickest option. Syntax: array. Generally one would use an if block to check value vs what's in array. if you have a question search the site for relevant questions and if you don't find one create your own question. – scrappedcola Oct 31 '16 at 13:35