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Parse JSON data, and then pass all its values to another function

I'm building this website: http://collections.design
The way it works is by reading all tools data from a JSON, using jQuery (I don't know much javascript). Then, you can click on an item and a side panels opens with further information. But there's a lot of repeated code, so I'm trying to optimise it a bit.
First I parse the JSON:
// The data source
var data_source = "../data/tools/tools.json";
// Parsing the JSON
$.getJSON(data_source, function(data) {
$.each(data, function(key,val) {
// And I'm storing all of its values in variables, to make them easier to read:
var name = val.availability.name;
var linux = val.os.linux;
// Then I'm using all that to render each item on screen
…
});
});
Each of the items has a button that calls another function to create and open the side panel. The side panel reuses that item's data from the JSON. This function to create the side panel is using the name variable as parameter, but then inside is parsing the JSON again to get the rest of the values it needs.
My question is:
How can I "encapsulate" all variables when I do the JSON parsing, then pass it as a parameter to the other function; and finally, individually read each of those values in the other function?
I tried working with arrays. But didn't manage it to work, also keeping in mind that I'm trying to simplify things, not repeat myself, and keep short names…
Maybe I'm asking too much, but any pointers or links to doc will be appreciated.

I see two ways of doing this.
1) Save the JSON data outside the scope so you can reuse it and pass the index of the data you want.
Something like this
// The data source
var data_source = "../data/tools/tools.json";
var all_data;
// Parsing the JSON
$.getJSON(data_source, function(data) {
all_data = data;
$.each(data, function(key,val) {
$('.button').on('click', function() { callToOtherFunction(key) })
});
});
function callToOtherFunction(key) {
console.log(all_data[key]);
}
2) As Sam Axe said, pass the data directly to the function
// The data source
var data_source = "../data/tools/tools.json";
// Parsing the JSON
$.getJSON(data_source, function(data) {
$.each(data, function(key,val) {
$('.button').on('click', function() { callToOtherFunction(key) })
});
});
function callToOtherFunction(val) {
console.log(val);
}
Here's a working fiddle.

The data is already "encapsulated" in the data object. Pass that object to the function that you want to use the data in.
You could always construct a new object - but what's the point - it's already in the data object.

How to access and use multiple data from json object? Do I need to make an array?

I am a beginner and using $.get to retrieve data from a rest API such as:
[{"id":"1","url":"http:\/\/123.456.78.910\/workforce\/images\/item1.jpg","price":"99","description":"Mobile Phone"},
{"id":"2","url":"http:\/\/123.456.78.910\/workforce\/images\/item2.jpg","price":"98","description":"Laptop"}
{"id":"3","url":"http:\/\/123.456.78.910\/workforce\/images\/item3.jpg","price":"92","description":"Console"}] }
$.get('http://xxxxxxxxxxx,
function (data) {
var obj = $.parseJSON(data);
So from what I understand I have retrieved the data from the REST API and parsed it so it is stored in a variable called obj.
My question is, how do I access and use each unique record in the obj variable?
Each record has it's own picture (item1.jpg, item2.jpg etc).
Whem my app loads I want it to show the item1.jpg image, and I want to be able to navigate to the other item pictures using buttons (previous / next).
I also want the description and price to be displayed underneath in some text input fields.
What I have figured so far is that I should:
Iterate through the obj variable, and store each record into an array.
Upon app initialisation I can set the default value for the image placeholder to array[index0].url, and set the description and price fields.
I can then set the previous and next buttons to array[currentIndex-1] or array[currentIndex+1].
Would this be the best way to do it?
Or can I just do this without using an array and manipulate the obj.data directly?
Thanks!!!

I may not be understanding what exactly what you want to do but I think I have the gist. If you just want to show the picture then the array of just images probably wouldn't be a bad idea. However, it looks like the Jason you're getting is already in an array. You can just use array index notation to get to what you want.
ie)
var arr = //your json response ;
var current = 0; //sets currently displayed object to the first in the array
var setCurrent = function () {
var image = arr[current]["url"];
}
You can then modify current however you want (on click on arrow iterate up/down, etc) then call the setCurrent function to set your image the the one you want. Hope that helps!

You can use the response you have from $.get() directly.
It is an array of objects.
You can use it like this:
console.log(data[2].description);
// outputs: "Console"
I've made a CodePen demo where it has a 4th object with a real image url to show you how to use the url info...
EDIT
Just in case you wouldn't know this:
You can use the response inside the scope of the $.get() callback...
You can not use it straith after the $.get() outside the callback since $.get() is asynchronous.
You can use it in some other handler wich will happen after the response is received.
var getResponse;
$.get('http://xxxxxxxxxxx', function (data) {
getResponse = data;
console.log(data[2].description);
// outputs: "Console"
console.log(getResponse[2].description);
// outputs: "Console"
});
console.log(getResponse[2].description);
// outputs: "Undefined"
// But since this handler will be triggered long after the response is obtained:
$("#somebutton").click(function(){
console.log(getResponse[2].description);
// outputs: "console"
});

In order for your page javascript to be able to access the data retrieved from your ajax request, you'll need to assign it to some variable which exists outside the callback function.
You will need to wait until the ajax request has been processed before you can read the array. So you might want to set the actual default image to be something that doesn't rely on the ajax request (a local image).
Here's a simple approach
// fake testing ajax func
function fakeget (url, callback) {
setTimeout(callback(JSON.stringify([
{"id":"1","url":"http:\/\/123.456.78.910\/workforce\/images\/item1.jpg","price":"99","description":"Mobile Phone"}, {"id":"2","url":"http:\/\/123.456.78.910\/workforce\/images\/item2.jpg","price":"98","description":"Laptop"},
{"id":"3","url":"http:\/\/123.456.78.910\/workforce\/images\/item3.jpg","price":"92","description":"Console"}
])), 1000);
}
// real code starts here
// global variables for ajax callback and setImg func to update
var imageData, currentImg;
// change this back to $.get for real
fakeget('http://xxxxxxxxxxx',
function (data) {
imageData = $.parseJSON(data);
setImg(0);
}
);
function setImg(index) {
// turns negative indices into expected "wraparound" index
currentImg = (index % imageData.length + imageData.length) % imageData.length;
var r = imageData[currentImg];
$("#theImg").attr('src', r.url);
$('#theDescription').text(r.price + " " + r.description);
}
$("#prev").click(function () {
setImg(currentImg - 1);
});
$("#next").click(function () {
setImg(currentImg + 1);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div>
<img id='theImg' src='somedefault.jpg'>
<div id='theDescription'></div>
</div>
<button id='prev'>Prev</button>
<button id='next'>Next</button>

Few observations :
Your JSON Object is not a valid JSON.
No need to parse it again your data is already a JSON Object.
Working fiddle
var data = [{"id":"1","url":"http:\/\/123.456.78.910\/workforce\/images\/item1.jpg","price":"99","description":"Mobile Phone"},{"id":"2","url":"http:\/\/123.456.78.910\/workforce\/images\/item2.jpg","price":"98","description":"Laptop"}, {"id":"3","url":"http:\/\/123.456.78.910\/workforce\/images\/item3.jpg","price":"92","description":"Console"}];
for (var i in data) {
var imgUrl = data[i].url;
console.log(imgUrl);
}

Object Compare in AngularJS

I have a form which when loaded sends GET request to server and recives data which will stored in 'master' and i copy that data to 'local' as below.
$scope.dirty = false;
init(data);
function init(data) {
$scope.master = angular.copy(data.data);
$scope.local = angular.copy($scope.master);
}
Now, I use local object as model for my form and I have to button submit and reset. I watch the local object as below.
$scope.$watchCollection('local', function (newLocal, oldLocal) {
$scope.dirty = !angular.equals(newLocal, $scope.master);
});
So, If dirty is true then i can know that data has been modified but since I am using Objects AngularJS adds $$hasKey to $scope.local and because of that $scope.dirty always sets to true.
So, is there any way to handle this problem? I am new to AngularJS so may be this can be funny question but I'm stuck.

You could convert your object to a JSON string before comparing:
function init(data) {
// store json data into $scope.master for later comparison
$scope.master = angular.toJson(data.data);
$scope.local = angular.copy(data.data);
}
$scope.$watchCollection('local', function (newLocal, oldLocal) {
var json = angular.toJson(newLocal); // new local without $$ key
$scope.status.dirty = !angular.equals(json, $scope.master);
// $scope.local is still a javascript object
});

I was sending data form PHP and PHP treats Number and string as seperate datatype.
So I converted those Number data to string and now It works as desired and also I leart that whenever I use <form name='newForm> angularJS creates a new scope named newForm so that I can you many properties of that scope like $dirty, $pristinem $submitted and many more. so Now I dont have to write this logic by myself

Overriding native methods and objects INSIDE a particular object

I'm trying to override a native method called "localStorage" for functions INSIDE an object.
Here's a gist of what I'm trying to do:
function SomeObject(){
this.localStorage = "aaa"; //block access to localStorage for functions INSIDE this object.
... (some more code here)
_testRun(){
window.testA = localStorage; //chose to store the instance on a window (global-like) object
}
this.testRun = function(){ _testRun(); };
this.testRun2 = function(){ window.testB = localStorage;};v
}
var a = new SomeObject();
a.testRun();
a.testRun2();
(after this, when I look up window.testA and window.testB, they both point to the Native localStorage, not the custom one inside the SomeObject.)
BTW, I don't want to override a native function for the whole document.
(i.e. might use native localStorage OUTSIDE the object)
Any suggestions/solutions on how I can do this? thanks!

Try to add window.localStorage and this.localStorage instead of just localStorage
function SomeObject(){
this.localStorage = "aaa"; //block access to localStorage for functions INSIDE this object.
... (some more code here)
_testRun(){
window.testA = window.localStorage; //chose to store the instance on a window (global-like) object
}
this.testRun = function(){ _testRun(); };
this.testRun2 = function(){ window.testB = this.localStorage;};
}

Can't access page-wide javascript variable

I'm fetching a JSON response and with that response, I have two values:
Air shipment cost.
Land shipment cost.
I want to save those two values somewhere in the client so that when a user chooses either 1 radio button or the other, I add that value to another element on the page.
Here's what I'm doing:
<script type="text/javascript">
$(document).ready(function () {
var landCost;
var airCost;
$("#ddlCiudad").change(function () {
var idCity = $("#ddlCiudad").val();
$.getJSON("/ProductCheckout/GetPriceForLocation", { cityId: idCity, productId: idProduct, type: "land" },
function (cityData) {
console.log("Recieved json data."); //This part works. It outputs.
var data = $.parseJSON(cityData);
console.log("Parse JSON response."); //This part works. It outputs.
landCost = data.LandCost;
console.log("Assigned value of LandCost"); //FAILS HERE. nothing is shown. not even an error.
airCost = data.AirCost;
console.log("Assigned value of AirCost");
alert(landCost);
console.log("Alerted land!");
alert(airCost);
console.log("Alerted air!");
}
);
});
So what do you suggest? I need to have the values of this JSON response, available for usage on that page, if I declare the variable inside the change() event, it'll be out of scope.
{"DaysToShip":" TER = 48 Hrs / AER = 24 Hrs","LandCost":"25,00","AirCost":""}

try
landCost = cityData.LandCost;

If you really must use global variables, you can attach them directly to the window object.
window.airCost = cityData.AirCost;
Really though you want to have the json request and the 'radio button' handling in the same scope, so that you're not polluting the global namespace at all.

Your call to $.parseJSON() is returning null because the data passed to your callback has already been parsed to JSON.
var json = {LandCost:3, AirCost:5},
results = $.parseJSON(json);
console.log(results); // results == null

IF you want to globally declare your variables, either put them outside the jQuery closure ($(document).ready(function () {...});), or don't use var to declare them. If you don't use the var keyword the variable will default to a global.
Here is a jsfiddle of setting global variables without using the var keyword: http://jsfiddle.net/jasper/JWtbV/

Have you considered using jQuery's $.data() function to attached the values directly to the body element in the DOM and accessing it from there?
// Set Values
$('body').data('landCost', data.LandCost);
$('body').data('airCost', data.AirCost);
// Retrieve Values //
console.log($('body').data('landCost');
console.log($('body').data('airCost');
Hope it helps.