Develop Reference

JSON Object Access Value

This is my JSON response:
{
"2f2EdLjYHcTx4APbgnlvE2SCXQb2": {
"name": "test",
"latitute": 7.4866174,
"longitute": 80.3637889
},
"pJua8KSpMwSXiSlWJcDE4sEkOuZ2": {
"name": "akalanka",
"latitute": 7.4866198,
"longitute": 80.3638016
}
}
How can i access name, latitude and longitute in JavaScript?
I tried using this method, it shows data but i can't access the properties I need:
var xmlHttp = new XMLHttpRequest();
xmlHttp.open( "GET", "http://localhost:3000/get/json", false );
xmlHttp.send();
var data=xmlHttp.responseText;
var x=[];
x=JSON.parse(xmlHttp.responseText);
// x=data.length;
console.log(x);
// latitute=x.latitute;
// longitute=x.longitute;
z=15;
myMap();
}

Two problems in the code:
1) You are using xmlHttp incorrectly.
You are sending the request but parsing the result directly (without waiting for the request to succeed).
xmlHttp.open( "GET", "http://localhost:3000/get/json", false );
xmlHttp.send();
xmlHttp.onload = function () {
// Request finished. Do processing here.
};
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/send
2) You need to use the key to access the 'latitute'.
Object.keys(x).forEach(field => {
console.log(x[field].latitute);
console.log(x[field].longitute);
});
So it should look like this:
xmlHttp.open( "GET", "http://localhost:3000/get/json", false );
xmlHttp.send();
xmlHttp.onload = function () {
var x = JSON.parse(xmlHttp.responseText);
Object.keys(x).forEach(field => {
console.log(x[field].latitute);
console.log(x[field].longitute);
});
};

First, please confirm that you already get responseText by using onreadystate method.
After that, please try with this.
var responseText = `{"2f2EdLjYHcTx4APbgnlvE2SCXQb2":{"name":"test","latitute":7.4866174,"longitute":80.3637889},"pJua8KSpMwSXiSlWJcDE4sEkOuZ2":{"name":"akalanka","latitute":7.4866198,"longitute":80.3638016}}`;
var x = JSON.parse(responseText);
console.log(x);
Object.keys(x).forEach(field => {
console.log(x[field].name);
});

Beware your properties are misspelled longitute, latitute... te? Should be de
I'd convert the nonstandard UID-as-keys to a simple Array.
Quick example using fetch API:
const myMap = (data) => {
console.log(`lat:${data.latitute}, lng:${data.longitute}`)
};
const fetchMapData = async () => {
const response = await fetch('https://jsbin.com/mijopocunu/js');
const json = await response.json();
const dataArr = Object.keys(json).map(k => (json[k].id = k, json[k]));
dataArr.forEach(myMap);
};
fetchMapData();

Why Parse.Cloud.run decodes returning object into object reference on success?

Take Parse Javascript SDK 1.6.4 for example,
from line 179:
_CoreManager2['default'].setCloudController({
run: function run(name, data, options) {
var RESTController = _CoreManager2['default'].getRESTController();
var payload = (0, _encode2['default'])(data, true);
var requestOptions = {};
if (options.hasOwnProperty('useMasterKey')) {
requestOptions.useMasterKey = options.useMasterKey;
}
if (options.hasOwnProperty('sessionToken')) {
requestOptions.sessionToken = options.sessionToken;
}
var request = RESTController.request('POST', 'functions/' + name, payload, requestOptions);
return request.then(function (res) {
var decoded = (0, _decode2['default'])(res);
if (decoded && decoded.hasOwnProperty('result')) {
return _ParsePromise2['default'].as(decoded.result);
}
return _ParsePromise2['default'].error(new _ParseError2['default'](_ParseError2['default'].INVALID_JSON, 'The server returned an invalid response.'));
})._thenRunCallbacks(options);
}
});
The _decode2['default'] uses fromJSON for Parse Object from line 4144:
key: 'fromJSON',
value: function fromJSON(json) {
if (!json.className) {
throw new Error('Cannot create an object without a className');
}
var constructor = classMap[json.className];
var o = constructor ? new constructor() : new ParseObject(json.className);
var otherAttributes = {};
for (var attr in json) {
if (attr !== 'className' && attr !== '__type') {
otherAttributes[attr] = json[attr];
}
}
o._finishFetch(otherAttributes);
if (json.objectId) {
o._setExisted(true);
}
return o;
}
I passed a full Parse object in my cloud code run success callback, but this decoding behavior purges my returning Parse object into a object reference.
Why do we want to have this?
Is there a option to get full object instead of a reference?
What I want is to get an updated object to update my view on success.

AJAX - setting parent object's member variables from callback function

I'm developing a Javascript libraray which I want to use as follows.
var obj = new Lib().actionOne();
This call should populate "transcript" and "session" member variables in obj.
Then I want to call:
obj.actionTwo();
which will use populated "transcript" and "session" objects in the previous call.
Find below my library.
var xmlhttp = null;
function Lib() {
this.transcript = null;
this.session = null;
return this;
}
Lib.prototype = {
_initRequest : function() {
// create xmlhttp request here
},
_consumeService : function(callback) {
this._initRequest();
xmlhttp.open("GET", "THE URL", true);
var self = this;
xmlhttp.onreadystatechange = function(self) {
if(xmlhttp.readyState==4 && xmlhttp.status==200 ){
callback.call(self);
}
};
xmlhttp.send();
},
actionOne: function() {
var connUrl = "SOME URL";
this._consumeService(this._actionOneCallback);
return this;
},
_actionOneCallback : function() {
var jsonObj = JSON.parse(xmlhttp.responseText);
this.session = jsonObj.session
this.transcript = jsonObj.transcript;
this.isActionOneDone = true;
xmlhttp = null;
},
actionTwo : function() {
// use this.session and this.transcript
}
};
The issue is that actionOneCallback() function doest not populate 'obj' members though I pass 'self' reference to it. Therefore when I call 'obj.actionTwo();', obj's member variables are undefined. What is the workaround for this?

Save Json in Javascript variable

I'm studying javascript these days and I have question. I have variable that contain an url. I would like to save the content of the url pointed by my variable in another variable...
The first variable is something like:
var Link = "http://mysite.com/json/public/search?q=variabile&k=&e=1";
If I open the link I see something like:
{
"count": 1,
"e": 1,
"k": null,
"privateresult": 0,
"q": "gabriel",
"start": 0,
"cards": [
{
"__guid__": "cdf8ee96538c3811a6a118c72365a9ec",
"company": false,
"__title__": "Gabriel Butoeru",
"__class__": "entity",
"services": false,
"__own__": false,
"vanity_urls": [
"gabriel-butoeru"
]
}
]
}
How can I save the json content in another javascript variable?

You would need a simple AJAX request to get the contents into a variable.
var xhReq = new XMLHttpRequest();
xhReq.open("GET", yourUrl, false);
xhReq.send(null);
var jsonObject = JSON.parse(xhReq.responseText);
Please note that AJAX is bound by same-origin-policy, in case that URL is different this will fail.

You can use like this
var savings_data = JSON.stringify(your_json_object);

You can save json as object in this way
Reference : Json
var obj = {};
obj.name = "test";
obj.no = "1234";

I think this might help you, using jQuery... :)
$.ajax({
beforeSend: function() { DO HERE WHATEVER }, //Show spinner
complete: function() { DO HERE WHATEVER }, //Hide spinner
type: 'POST',
url: Link,
dataType: 'JSON',
success: function(data){
var data = data;
OR IF YOU WANT SEPARATE THE VALUES...
var count = data.count;
var e = data.e;
var k = data.k;
...
}
});

This example considers the state of the request and will allow you to access the data from the JSON format using the dot operator.
var request = new XMLHttpRequest();
request.open("GET", "mysite.com/json/public/search?q=variabile&k=&e=1", true);
request.setRequestHeader("Content-type", "application/json");
request.send();
request.onreadystatechange = function(){
if(request.ready == 4 && request.readyState == 200){
var response = request.responseText;
var obj = JSON.parse(response);
alert(obj.count); // should return the value of count (i.e Count = 1)
alert(obj.e); // should return the value of e (i.e. e = 1)
var count = obj.count; //store the result of count into your variable
var e = obj.e; //store the result of e into your variable
//...and so on
}
}

receiving json via ajax asp.net issue

I am trying to receive a json data using ajax asp.net.
i have got a web service with a web method -
[WebMethod]
public List<Song> GetSongListByMood(string Mood)
{
SongBL songbl = new SongBL();
return songbl.GetSongListByMoodBL(Mood);
}
and i have got the javascript code -
$(document).ready(function () {
var cssSelector = {
jPlayer: "#jquery_jplayer_1",
cssSelectorAncestor: "#jp_container_1"
};
var playlist = [];
var options = {
swfPath: "./js",
supplied: "mp3"
};
var myPlaylist = new jPlayerPlaylist(cssSelector, playlist, options);
$("#slider a").click(function () {
var mood = $(this).text();
var xhr = new XMLHttpRequest();
var url = "AvironaService.asmx/GetSongListByMood";
xhr.open("POST", url, true);
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
var obj = JSON.parse(xhr.responseXML.text);
myPlaylist.playlist = obj;
}
};
var contentType = "application/x-www-form-urlencoded"
xhr.setRequestHeader("Content-Type", contentType);
var qs = 'Mood=' + mood;
xhr.send(qs);
});});
now basically what im trying to do is get the data from the server using ajax in json format and put the data in the playlist variable

You need to make a few changes.
Change your method to return a string instead of List<Song>.
add a using statement using System.Web.Script.Serialization.
Create an instance of JavaScriptSerializer and use that to serialize your object and return the results.
So...
using System.Web.Script.Serialization;
[WebMethod]
[ScriptMethod(ResponseFormat=ResponseFormat.Json)]
public string GetSongListByMood(string Mood)
{
SongBL songbl = new SongBL();
var jss = new JavaScriptSerializer();
return jss.Serialize(songbl.GetSongListByMoodBL(Mood));
}
Change your AJAX code to leverage the JQuery methods available:
$("#slider a").click(function () {
$.ajax({
"url" : "AvironaService.asmx/GetSongListByMood",
"type" : "post",
"data" : {"Mood" : $(this).text()},
"dataType" : "json"
"success" : function(data){
myPlaylist.playlist = data;
}
});
});