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Javascript arrays

Let's suppose I have an associative array like this one
var client1={
"id":"1"
"category":"Interiorism",
"photo1":"img/ClientCorp/photoClient1.jpg",
"photo2":"img/ClientCorp/photoClient2.jpg",
"photo3":"img/ClientCorp/photoClient3.jpg",
"photo4":"img/ClientCorp/photoClient4.jpg",
};
var client2={
.
.
.
};
allClients=[client1, client2..., clientx];
I want to set up a function that pushs the photo keys in an empty array. The problem is that not all the clients have the same number of photos, so I am using 'for'. Here is the function I wrote
function photoKeys()
{
var keyList=Object.keys(allClients[id]);
var numKey=parseInt(listaKeys.length);
var photoAlbum=[]; //here I want to put the photo URL's
for (i=2; i<=numFotos; i++)
{
????????????
}
}
Here is the problem, how I can write the photo object from the client array whith the i var from the 'for' function?
I tried this but didn't work
for (i=2; i<=numFotos; i++)
{
photoAlbum.push(allClients[id].photo+'i');
}

Your current code would be parsed like this:
photoAlbum.push(allClients[id].photo + 'i');
It would try to evaluate allClients[id].photo and then append the string i. You need to access the property name using bracket notation instead of dot notation.
You also have the symbol and string part backward, photo is the string and i is your index variable.
photoAlbum.push(allClients[id]['photo' + i]);

The big thing to understand is that client in your example isn't an array, it's an object.
var client1={
"id":"1"
"category":"Interiorism",
"photo1":"img/ClientCorp/photoClient1.jpg",
"photo2":"img/ClientCorp/photoClient2.jpg",
"photo3":"img/ClientCorp/photoClient3.jpg",
"photo4":"img/ClientCorp/photoClient4.jpg",
};
You can acquire an object's keys as an array using Object.keys(client1), or you can loop through all an object's keys using for...in syntax.
If you want to feed an arbitrary number (numFotos) of property values from your object into an array called photoAlbum, you can use the following syntax:
var i = 0;
for(var key in client1){
photoAlbum.push(client1[key]);
if(++i >= numFotos){
break; // break out of the loop if i equals or exceeds numFotos
}
}

First of all you should be accessing the photo paths like:
photoAlbum.push(allClients[id]['photo' + i]);
But i would really recommend you to change the format of your client object to something like this:
var client1 = {
"id" :"1"
"category" :"Interiorism",
"photos" : [
"img/ClientCorp/photoClient1.jpg",
"img/ClientCorp/photoClient2.jpg",
...
]
};
Or this, if you need to store those "photo1", "photo2" ids:
var client2 = {
"id" :"1"
"category" :"Interiorism",
"photos" : [
{
"id" : "photo1",
"path" :"img/ClientCorp/photoClient1.jpg"
},
...
]
};
Then you can iterate them way easier like this:
for(var i = 0; i < allClients[id].photos.length; i++){
photoAlbum.push(allClients[id].photos[i]);
//or this for the second format:
//photoAlbum.push(allClients[id].photos[i].path);
}

Iterate over json hash in javascript

Json:
{
"comments":[
{"id":1,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/1.json"},
{"id":2,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/2.json"},{"id":3,"author_name":"Yerassyl","comment_text":"Hello world!","url":"http://localhost:3000/comments/3.json"},
{"id":4,"author_name":"Yerassyl","comment_text":"hi there","url":"http://localhost:3000/comments/4.json"}
]
}
How to iterate over each comment in comments. I want something like that:
//pseudocode
comments.each(key,value){
// do something
}
I tried map, but map is for arrays.
EDIT:
If i delete root node 'comments' i can use .map:
var commentNodes = this.props.comments.map(function(comment,index){
});
Ignore this.props, it is actually React.js.
console.log(this.props.comments) returns my json objects with root node 'comments'

Assuming you have
var obj = {
"comments":[
{"id":1,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/1.json"},
{"id":2,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/2.json"},{"id":3,"author_name":"Yerassyl","comment_text":"Hello world!","url":"http://localhost:3000/comments/3.json"},
{"id":4,"author_name":"Yerassyl","comment_text":"hi there","url":"http://localhost:3000/comments/4.json"}
]
};
You can just do, for example,
obj.comments.map(function (comment) {
console.log(comment);
});

Assuming you have already JSON.parsed the string, you can use forEach to iterate. Map is only for returning a new array from your existing values.
this.props.comments.comments.forEach(function(value, index) {
console.log(value, index);
});
edit: Sounds like this.props.comments is the root object. Hence the accessor above

Firstly you have to parse your JSON data:
var json = '{
"comments":[
{"id":1,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/1.json"},
{"id":2,"author_name":null,"comment_text":null,"url":"http://localhost:3000/comments/2.json"},{"id":3,"author_name":"Yerassyl","comment_text":"Hello world!","url":"http://localhost:3000/comments/3.json"},
{"id":4,"author_name":"Yerassyl","comment_text":"hi there","url":"http://localhost:3000/comments/4.json"}
]
}';
var data = JSON.parse(json);
And then you can proceed and loop throught comments like this:
data.comments.forEach(function(comment, index) {
console.log("Comments["+index+"]: "+comment);
});
Note:
Once your JSON is parsed you will get an object including an array of comments so you can easily use all the Array.prototype methods with it including forEach and map.

Javascript: How to parse a json array without knowing the key name?

I want to parse the following json:
{"key_410441":{"hashId":"hash123","tube_id":"4accdefk31"}}
Where key_410441 is the entry's name representing the object's value, and the following array is the object's data.
How can I retrieve it's value?
function defined(json) {
for (var i in json) {
var objId = json[i]. ????
}
}

Like Robo Robok said, use Object.keys(object)
if your json look like {"key_410441":{"hashId":"hash123","tube_id":"4accdefk31"}}
function defined(json) {
var hashId = json[Object.keys(json)[0]].hashId
var tube_id = json[Object.keys(json)[0]].tube_id
}
}
you can use shortcut json[Object.keys(json)] because you have olny one object
key_410441

Object keys are returned in form of an array by Object.keys(object)

I suppose you are using jquery and ajax to get a json from an external file. Then the piece of code would be:-
$.getJSON("aa.json", function(data) {
var obj = Object.keys(data),
json = data[obj];
for(var s in json) {
console.log(json[s]);
}
});

Printing JSON Dictionary in JavaScript

I am getting the data from an API using JavaScript.
The statement console.log(json[0]) gives the result:
{"id":"1","username":"ghost","points":"5","kills":"18","xp":"10","diamonds":"0","level":"1","missionscomplete":"1"}
Now I am trying to print the individual elements of this dictionary. How do I do this ? My code is below:
function loadLeaderboard(){
$.get("http://localhost:8888/l4/public/api/v1/getLeaderboard",function(data){
var json = $.parseJSON(data);
console.log(json[0]);
$.each(json[i], function(key, data) {
console.log(key + ' -> ' + data);
});
});
}
EDIT:
The value of data as returned by the API is
["{\"id\":\"1\",\"username\":\"ghost\",\"points\":\"5\",\"kills\":\"18\",\"xp\":\"10\",\"diamonds\":\"0\",\"level\":\"1\",\"missionscomplete\":\"1\"}","{\"id\":\"2\",\"username\":\"seconduser\",\"points\":\"0\",\"kills\":\"3\",\"xp\":\"0\",\"diamonds\":\"0\",\"level\":\"0\",\"missionscomplete\":\"0\"}","{\"id\":\"3\",\"username\":\"goat\",\"points\":\"12\",\"kills\":\"13\",\"xp\":\"14\",\"diamonds\":\"10\",\"level\":\"10\",\"missionscomplete\":\"4\"}"]
The value in json after the operation var json = $.parseJSON(data); is
["{"id":"1","username":"ghost","points":"5","kills":…diamonds":"0","level":"1","missionscomplete":"1"}", "{"id":"2","username":"seconduser","points":"0","ki…diamonds":"0","level":"0","missionscomplete":"0"}", "{"id":"3","username":"goat","points":"12","kills":…amonds":"10","level":"10","missionscomplete":"4"}"]

You can just use stringify method of JSON-
console.log(JSON.stringify(json[0]));

Update
Your JSON data is a mess. It's not in the format you want. It should be an array of objects, but instead it is an array of strings, where each of those strings is the JSON representation of one of your user objects.
You could decode this in your JavaScript code, but you shouldn't have to. The JSON API should be fixed to generate a reasonable JSON object.
I don't know what language your server code is in, but it must be doing something like this pseudocode:
array = []
for each userObject in leaderBoard:
userJson = toJSON( userObject )
array.push( userJson )
jsonOutput = toJSON( array )
Instead, the code should look more like this:
array = []
for each userObject in leaderBoard:
array.push( userObject )
jsonOutput = toJSON( array )
In other words, the way to generate the JSON you want in most languages is to create an object or array with the structure you need, and then call the language's toJSON function (or whatever function you use) on that object or array. Let it generate all of the JSON in one fell swoop. Don't generate JSON for each individual element of your array and then generate JSON again for the entire array as a whole. That gives you an array of strings where you want an array of objects.
Original answer
What you're asking for is not what you really want to do.
Your JSON response returns an array of user objects, correct? That's why json[0] is a single object.
You probably want to loop over that array, but you don't loop over the individual objects in the array. You simply reference their properties by name.
Also, instead of using $.get() and $.parseJSON(), you can use $.getJSON() which parses it for you.
And one other tip: don't put the hostname and port in your URL. Use a relative URL instead, and then you can use the same URL in both development and production.
So for test purposes, let's say you want to log the id, username, and points for each user in your leaderboard JSON array. You could do it like this:
function loadLeaderboard() {
var url = '/l4/public/api/v1/getLeaderboard';
$.getJSON( url, function( leaders ) {
// leaders is an array of user objects, so loop over it
$.each( leaders, function( i, user ) {
// get the properties directly for the current user
console.log( user.id, user.username, user.points );
});
});
}

json[0] is an object, so you want to loop over the keys:
var o = json[0];
for (var key in o) {
if (o.hasOwnProperty(key)) {
console.log(key, o[key]);
}
}
Working fiddle: http://jsfiddle.net/UTyDa/

jQuery.each() is probably the easiest way, check this out: http://api.jquery.com/jQuery.each/
eg
$.each(json[0], function(key, data) {
console.log(key + ' -> ' + data);
});
EDIT:
What's the result of the following?
function loadLeaderboard(){
$.get("http://localhost:8888/l4/public/api/v1/getLeaderboard",function(data){
var json = $.parseJSON(data);
console.log(json[0]);
for(var i = 0; i < json.length; i++) {
$.each(json[i], function(key, data) {
console.log(key + ' -> ' + data);
});
}
});
}
EDIT 2: 'data' returned as array.
function loadLeaderboard(){
$.get("http://localhost:8888/l4/public/api/v1/getLeaderboard", function(data){
for(var i = 0; i < data.length; i++) {
var json = $.parseJSON(data[i]);
console.log('Data for index: ' + i);
$.each(json, function(key, val) {
console.log(key + ' -> ' + val);
});
}
});
}

Looping to Parse JSON Data

Description and Goal:
Essentially data is constantly generated every 2 minutes into JSON data. What I need to do is retrieve the information from the supplied JSON data. The data will changed constantly. Once the information is parsed it needs to be captured into variables that can be used in other functions.
What I am stuck in is trying to figure out how to create a function with a loop that reassigns all of the data to stored variables that can later be used in functions.
Example information:
var json = {"data":
{"shop":[
{
"carID":"7",
"Garage":"7",
"Mechanic":"Michael Jamison",
"notificationsType":"repair",
"notificationsDesc":"Blown Head gasket and two rail mounts",
"notificationsDate":07/22/2011,
"notificationsTime":"00:02:18"
},
{
"CarID":"8",
"Garage":"7",
"Mechanic":"Tom Bennett",
"notificationsType":"event",
"notifications":"blown engine, 2 tires, and safety inspection",
"notificationsDate":"16 April 2008",
"notificationsTime":"08:26:24"
}
]
}};
function GetInformationToReassign(){
var i;
for(i=0; i<json.data.shop.length; i++)
{
//Then the data is looped, stored into multi-dimensional arrays that can be indexed.
}
}
So the ending result needs to be like this:
shop[0]={7,7,"Michael Jamison",repair,"Blown Head gasket and two rail mounts", 07/22/2011,00:02:18 }
shop[1]={}

You can loop through your JSON string using the following code,
var JSONstring=[{"key1":"value1","key2":"value2"},{"key3":"value3"}];
for(var i=0;i<JSONstring.length;i++){
var obj = JSONstring[i];
for(var key in obj){
var attrName = key;
var attrValue = obj[key];
//based on the result create as you need
}
}
Hope this helps...

It sounds to me like you want to extract the data in the "shop" property of the JSON object so that you can easily reference all of the shop's items. Here is an example:
var json =
{
"data":
{"shop":
[
{"itemName":"car", "price":30000},
{"itemName":"wheel", "price":500}
]
}
},
inventory = [];
// Map the shop's inventory to our inventory array.
for (var i = 0, j = json.data.shop.length; i < j; i += 1) {
inventory[i] = json.data.shop[i];
}
// Example of using our inventory array
console.log( inventory[0].itemName + " has a price of $" + inventory[0].price);

Well, your output example is not possible. You have what is a list of things, but you're using object syntax.
What would instead make sense if you really want those items in a list format instead of key-value pairs would be this:
shop[0]=[7,7,"Michael Jamison",repair,"Blown Head gasket and two rail mounts", 07/22/2011,00:02:18]
For looping through properties in an object you can use something like this:
var properties = Array();
for (var propertyName in theObject) {
// Check if it’s NOT a function
if (!(theObject[propertyName] instanceof Function)) {
properties.push(propertyName);
}
}
Honestly though, I'm not really sure why you'd want to put it in a different format. The json data already is about as good as it gets, you can do shop[0]["carID"] to get the data in that field.