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How to read data from json format using jquery

How to read data from json format using jquery. below is what i have tried, but unfortualtly i couldn't able to read exact data which i want.
$.ajax({
url: '#Url.HttpRouteUrl("GetDistrictList", new { })',
type: 'GET',
datatype: "json",
success: function (data, txtStatus, xhr) {
console.log(data);
if (data != null) {
$.each(data, function (i, item) {
alert(data[0]);
alert(data[0].DistrictCode)
alert(item);
alert(item[0]);
alert(item.DistrictCode);
$('#tblDistricts > tbody').append('<tr><td>'+item.DistrictCode+'</td><td>test</td><td>test</td><td>test</td><td>test</td><td>test</td></tr>');
})
}
},
error: function (xhr, textStatus, errorThrown) {
console.log("error in GetDistrictList : " + errorThrown);
}
});'
In alert box , I'm getting 'undefined' or '[object] [Object] only, I could not able to read exact data. I got stuck here.
Edit:
Web api will return the data as List objects.
[HttpGet]
[Route("GetDistrict/", Name = "GetDistrictList")]
public List<DistrictModels> GetDistrictList()
{
BAL_District oBAL_District = new BAL_District();
return oBAL_District.GetDistrictList();
}

Use var Data = $.parseJSON(response);
Example
var obj = jQuery.parseJSON( '{ "name": "John" }' );
alert( obj.name === "John" );
JSON.stringify turns a Javascript object into JSON text and stores that JSON text in a string.
JSON.parse turns a string of JSON text into a Javascript object.
How to access JSON object
FYI, as of jQuery 3.0, $.parseJSON is deprecated. To parse JSON objects, use the native JSON.parse method instead.
var json = [
{ 'red': '#f00' },
{ 'green': '#0f0' },
{ 'blue': '#00f' }
];
$.each(json, function () {
$.each(this, function (name, value) {
console.log(name + '=' + value);
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

I think you wish to call this function -
http://api.jquery.com/jquery.parsejson/

if you are getting [object,object] it means you have already fetched the Json Object. And if you need some clarifications, please share the expected Json you want.Thanks

Use JSON.stringify(object). It is super safe way to print out.
$.ajax({
url: '#Url.HttpRouteUrl("GetDistrictList", new { })',
type: 'GET',
datatype: "json",
success: function (data, txtStatus, xhr) {
console.log(data);
if (!!data) {
// '!data' means data variable is not available and '!!data' returns true:boolean if variable is valid
//idx is 'index', I made the code as a loop. It will not work if array is empty.
//It is good way to avoid error
for(var idx in data){
if(idx == 0) {
//JSON.stringify makes object type to string type. It is safe to use since it is a native javascript function
alert(JSON.stringify(data[idx]);
//You can access member by 'data[idx].memberName'
//DOM adding code can be here
}
}
}
},
error: function (xhr, textStatus, errorThrown) {
console.log("error in GetDistrictList : " + errorThrown);
}
});

Assuming your server side script doesn't set the proper Content-Type: application/json response header you will need to indicate to jQuery that this is JSON by using the dataType: 'json' parameter.
You should not use data variable in $.each(). Then you could use the $.each() function to loop through the data:
$.ajax({
url: '#Url.HttpRouteUrl("GetDistrictList", new { })',
type: 'GET',
datatype: "json",
success: function (data, txtStatus, xhr) {
console.log(data);
if (data != null) {
$.each(data, function (index, element) {
alert(element);
alert(element[0]);
alert(element.DistrictCode);
$('#tblDistricts > tbody').append('<tr><td>'+element.DistrictCode+'</td><td>test</td><td>test</td><td>test</td><td>test</td><td>test</td></tr>');
});
}
},
error: function (xhr, textStatus, errorThrown) {
console.log("error in GetDistrictList : " + errorThrown);
}
});'
or use the $.getJSON method:
For example:
$.getJSON('/functions.php', { get_param: 'value' }, function(data) {
$.each(data, function(index, element) {
$('body').append($('<div>', {
text: element.name
}));
});
});
Note: As of jQuery 3.0, $.parseJSON is deprecated. To parse JSON objects, use the native JSON.parse method instead.

Ajax call showing error cant debug

this is how the javascript looks like
<script type="text/javascript">
$(document).ready(function () {
$('#loginButton').click(function () {
//this.disabled = true;
debugger;
var data = {
"userid": $("#username").val(),
"password": $("#password").val()
};
$.ajax({
url: "/Account/LoginPost",
type: "POST",
data: JSON.stringify(data),
dataType: "json",
contentType: "application/json",
success: function (response) {
if (response.Success) {
$.get("#Url.Action("Search", "Home")", function (data) {
$('.container').html(data);
});
}
else
window.location.href = "#Url.Action("Index", "Home")";
},
error: function () {
alert('Login Fail!!!');
}
});
});
});
I am getting the alert('Login fail') also debugger not getting hit.
I am using jquery 1.9.1 and have included unobstrusive
my controller is this as you can i am passing string values not object values
to the controller so stringify is justified here
[HttpPost]
public JsonResult LoginPost(string userid, string password)
{
using (someentities wk = new someentities())
{
var LoginUser = wk.tblUsers.Where(a => a.Username.Equals(userid)&&a.Password.Equals(password)).FirstOrDefault();
if (LoginUser != null)
{
FormsAuthentication.SetAuthCookie(userid,false);
Session["Username"] = LoginUser.Username;
Session["Password"] = LoginUser.Password;
Session["Name"] = LoginUser.Name;
return Json(new { Success = true }, JsonRequestBehavior.AllowGet);
}
else
{
TempData["Login"] = "Please Enter Correct Login Details";
return Json(new { Success = false }, JsonRequestBehavior.AllowGet);
}
}
// If we got this far, something failed, redisplay form
}
when page is loading these error are shown
$(..) live is not a valid function in
(anonymous function) # jquery.unobtrusive-ajax.js:115
(anonymous function) # jquery.unobtrusive-ajax.js:163

take a look to the success function
success: function (response) {
if (response.Success) {
$.get("#Url.Action("Search", "Home")", function (data) {
$('.container').html(data);
});
}
else
window.location.href = "#Url.Action("Index", "Home")";
}
you are using multiple ", combine it with the single one ', this is a syntax error, try to check the code on an editor such as Atom, to avoid this kind of errors

Stringify converts an object to a string. Have you tried passing data an object instead of a string? Try replacing JSON.stringify(data), with data?

Loading remote data only once with Select2

As the title suggests I would like to load remote data once only.
I thought about loading a data with independent ajax call and set it "locally" at the control but wonder if there is more "built in" way to do so...

a solution can be found here:
https://github.com/ivaynberg/select2/issues/110
$("#selIUT").select2({
cacheDataSource: [],
placeholder: "Please enter the name",
query: function(query) {
self = this;
var key = query.term;
var cachedData = self.cacheDataSource[key];
if(cachedData) {
query.callback({results: cachedData.result});
return;
} else {
$.ajax({
url: '/ajax/suggest/',
data: { q : query.term },
dataType: 'json',
type: 'GET',
success: function(data) {
self.cacheDataSource[key] = data;
query.callback({results: data.result});
}
})
}
},
width: '250px',
formatResult: formatResult,
formatSelection: formatSelection,
dropdownCssClass: "bigdrop",
escapeMarkup: function (m) { return m; }
});
Edit:
I might have misinterpreted your question. if you wish to load all data once, then use that is Select2, there is no built in functionality to do that.
Your suggestion to do a single query, and then use that stored data in Select2 would be the way to go.

This is for Select2 v4.0.3:
I had this same question and got around it by triggering an AJAX call and using the data returned as the initialized data array.
// I used an onClick event to fire the AJAX, but this can be attached to any event.
// Ensure ajax call is done *ONCE* with the "one" method.
$('#mySelect').one('click', function(e) {
// Text to let user know data is being loaded for long requests.
$('#mySelect option:eq(0)').text('Data is being loaded...');
$.ajax({
type: 'POST',
url: '/RetrieveDropdownOptions',
data: {}, // Any data that is needed to pass to the controller
dataType: 'json',
success: function(returnedData) {
// Clear the notification text of the option.
$('#mySelect option:eq(0)').text('');
// Initialize the Select2 with the data returned from the AJAX.
$('#mySelect').select2({ data: returnedData });
// Open the Select2.
$('#mySelect').select2('open');
}
});
// Blur the select to register the text change of the option.
$(this).blur();
});
This worked well for what I had in mind. Hope this helps people searching with the same question.

To load data once:
Assumptions:
You have a REST API endpoint at /services that serves a JSON array of objects
The array contains objects which have at least a "name" and "id" attribute. Example:
[{"id": 0, "name": "Foo"}, {"id": 1, "name": "Bar"}]
You want to store that array as the global 'services_raw'
First, our function to load the data and create the global 'services_raw' (AKA 'window.services_raw'):
fetchFromAPI = function() {
console.log("fetchFromAPI called");
var jqxhr = $.ajax(
{
dataType:'json',
type: 'GET',
url: "/services",
success: function(data, textStatus, jqXHR) {
services_raw = data;
console.log("rosetta.fn.fetchServicesFromAPI SUCCESS");
rosetta.fn.refreshServicesSelect();
},
error: function(jqXHR, textStatus, errorThrown) {
console.log("Error inside rosetta.fn.fetchServicesFromAPI", errorThrown, textStatus, jqXHR);
setTimeout(rosetta.fn.fetchServicesFromAPI(), 3000); // retry in 3 seconds
}
}
)
.done(function () {
console.log("success");
console.log(jqxhr);
})
.fail(function () {
console.log("error");
})
.always(function () {
console.log("complete");
});
// Perform other work here ...
// Set another completion function for the request above
jqxhr.always(function () {
console.log("second complete");
});
};
Second, our Select2 instantiation code which transforms our data into a format that Select2 can work with:
refreshServicesSelect = function () {
// ref: http://jsfiddle.net/RVnfn/2/
// ref2: http://jsfiddle.net/RVnfn/101/ # mine
// ref3: http://jsfiddle.net/RVnfn/102/ # also mine
console.log('refreshServicesSelect called');
$("#add-service-select-service").select2({
// allowClear: true
data: function() {
var arr = []; // container for the results we're returning to Select2 for display
for (var idx in services_raw) {
var item = services_raw[idx];
arr.push({
id: item.id,
text: item.name,
_raw: item // for convenience
});
}
return {results: arr};
}
});
};
Here's what the Select2 element in HTML should look like before your call the above functions:
<input id="add-service-select-service" type="hidden" style="width:100%">
To use all of this, call (in JS):
window.fetchFromAPI();
window.refreshServicesSelect();
Lastly, here's a JSFiddle where you can play with a similar thing: http://jsfiddle.net/RVnfn/102/
Basically, in my example above, we're just using ajax to populate the equivalent of window.pills in the Fiddle.
Hope this helps :)
Please reply if you know how to do this via the Select2 .ajax function, as that would be a bit shorter.

In my condition, it is working perfectly with the given code
$('#itemid').select2({
cacheDataSource: [],
closeOnSelect: true,
minimumInputLength: 3,
placeholder: "Search Barcode / Name",
query: function(query) {
// console.log(query);
self = this;
var key = query.term;
var cachedData = self.cacheDataSource[key];
if(cachedData) {
query.callback({results: cachedData});
return;
} else {
$.ajax({
url: "./includes/getItemSelect2.php",
data: { value : query.term },
dataType: 'json',
type: 'POST',
success: function(data) {
self.cacheDataSource[key] = data;
query.callback({results: data});
}
});
}
},
});
And my data return from the ajax is in this form
<?php
$arr = [
["id" => 1, "text" => "Testing"],
["id" => 2, "text" => "test2"],
["id" => 3, "text" => "test3"],
["id" => 4, "text" => "test4"],
["id" => 5, "text" => "test5"]
];
echo json_encode($arr);
exit();
?>

JQPlot, JSON and 'No data specified' Error

I am trying to use JQPlot within a VB.NET application under .NET 3.5. On a button click, using jquery, I am trying to populate the JQPlot Chart with JSON derived data using a ASP.NET Webservices Source file (which is part of the solution).
The JSON data is sent by the web service but when it is presented to JQPlot I get the javascript error 'No Data Specified' which is generated by JQPlot code.
My code listing is as follows:
Code to listen for the button to be clicked:
$(document).ready(function () {
$('#<%=btnASMX1.ClientID%>').click(function () {
getElectricDataJSON();
return false;
});
});
Javascript code outside the 'document.ready' function:
function ajaxDataRenderer() {
var ret = null;
$.ajax({
// have to use synchronous here, else the function
// will return before the data is fetched
async: false,
//url: url,
type: 'POST',
contentType: 'application/json; charset=utf-8',
url: "AccountsService.asmx/GetJSONData",
data: "{AccountID: " + $('#<%= hiddenAccountID.ClientID%>').val() + " }",
dataType: "json",
success: function (response) {
var ret = response.d;
// The following two lines just display the JSON data for testing purposes
$('#<%=outputASMX.ClientID%>').empty();
$('#<%=outputASMX.ClientID%>').html("<div>" + ret + "</div>");
return ret;
},
error: function (request) {
$('#<%=outputASMX.ClientID%>').html("<div style='color:red;'>WEBSERVICE UNREACHABLE</div>");
}
});
return ret;
};
var jsonurl = "./jsondata.txt";
function getElectricDataJSON() {
var ret = ajaxDataRenderer();
var plot1 = $.jqplot('chart2', jsonurl, {
title: "AJAX JSON Data Renderer",
dataRenderer: ret, //$.jqplot.ciParser
dataRendererOptions: {
unusedOptionalUrl: jsonurl
}
});
}
The JSON data format is as follows:
[ { "todate": "2013-09-23T00:00:00", "Bill": 7095.65 }, { "todate": "2013-08-22T00:00:00", "Bill": 1137.96 }, { "todate": "2013-07-24T00:00:00", "Bill": 220429.41 }, ... ]
Any help or advice will be appreciated.

Thanks to #Fresh for their quick response. Here is the complete solution to my problem:
Code to listen for the button to be clicked:
$(document).ready(function () {
$('#<%=btnASMX1.ClientID%>').click(function () {
getElectricDataJSON();
return false;
});
});
JS function to get the data from a web service:
function ajaxDataRenderer() {
var ret = null;
$.ajax({
// have to use synchronous here, else the function
// will return before the data is fetched
async: false,
type: 'POST',
contentType: 'application/json; charset=utf-8',
url: "AccountsService.asmx/GetJSONData",
data: "{AccountID: " + $('#<%= hiddenAccountID.ClientID%>').val() + " }",
dataType: "json",
success: function (response) {
ret = response.d; // return response string object
},
error: function (request) {
$('#<%=outputASMX.ClientID%>').html("<div style='color:red;'>WEBSERVICE UNREACHABLE</div>");
}
});
return ret;
};
Data structure outputted by the web service is:
[ { "todate": "2013-09-23T00:00:00", "Bill": 7,095.65 }, { "todate": "2013-08-22T00:00:00", "Bill": 1,137.96 }, { "todate": "2013-07-24T00:00:00", "Bill": 220,429.41 }, ... ]
Data structure that is expected by JQPlot:
[ [ "2013-09-23T00:00:00", 7095.65 ] , [ "2013-08-22T00:00:00", 1137.96 ], [ "2013-07-24T00:00:00", 220429.41 ], ... ]
Note the removal of the comma's in the 'expected data' Bill field.
And finally, the function getElectricDataJSON() that is being called by btnASMX1 where 'chart2' is the ID of the div tags where the chart will be drawn.
function getElectricDataJSON() {
// Get JSON 'string' object
var ret = ajaxDataRenderer();
// If JSON string object is null, stop processing with friendly message
if (ret == null) {
$('#<%=outputASMX.ClientID%>').html("<div style='color:red;'>CHARTS ARE NOT AVAILABLE AT THIS TIME</div>");
return false;
}
// Now push required data into a JSON array object
var sampleData = [], item;
$.each(ret, function (key, value) {
sampleData.push([value.todate, parseFloat(value.Bill.replace(/,/g, ""))]);
});
var plot = $.jqplot('chart2', [sampleData], {
title: 'AJAX JSON Data Renderer',
dataRenderer: sampleData,
...
});
}

The method signature for your datarender (i.e. ajaxDataRender) is wrong. The signature should look like this:
function(userData, plotObject, options) { ... return data; }
(See the documentation here)
In your example you are passing the datarenderer "ret" which is not a function with the correct datarender signature. Also the jsonurl you are passing to getElectricDataJSON() is redundant as at no point in your code is the data from "AccountsService.asmx/GetJSONData" persisted to "./jsondata.txt".
Hence you should change your code to this:
$(document).ready(function(){
function ajaxDataRenderer(url, plot, options) {
var ret = null;
$.ajax({
// have to use synchronous here, else the function
// will return before the data is fetched
async: false,
url: url,
dataType: "json",
success: function (response) {
var ret = response;
// The following two lines just display the JSON data for testing purposes
$('#<%=outputASMX.ClientID%>').empty();
$('#<%=outputASMX.ClientID%>').html("<div>" + ret + "</div>");
},
error: function (request) {
$('#<%=outputASMX.ClientID%>').html("<div style='color:red;'>WEBSERVICE UNREACHABLE</div>");
}
});
return ret;
};
var url = "AccountsService.asmx/GetJSONData";
function getElectricDataJSON() {
var plot1 = $.jqplot('chart2', url, {
title: "AJAX JSON Data Renderer",
dataRenderer: ajaxDataRenderer,
});
}

Json MVC3 Object value in Javascript

I am sending json list from my controller:
public ActionResult LoadTree()
{
List<ListItem> list = new List<ListItem>() {
new ListItem() { Text = "Keyvan Nayyeri" },
new ListItem() { Text = "Simone Chiaretta" },
new ListItem() { Text = "Scott Guthrie" },
new ListItem() { Text = "Scott Hanselman" },
new ListItem() { Text = "Phil Haack" },
new ListItem() { Text = "Rob Conery" }
};
return new JsonResult { Data = list };
}
Trying to get the list in my view using:
var text =
$.ajax({
url: '/CourseCases/LoadTree',
dataType: 'json',
data: { },
cache: false,
type: 'GET',
success: function (data) {
}
});
alert(text);
I just get [object object]. How I can get the actual value of the object? Thanks in advance.

First you have to set the JsonRequestBehavior = JsonRequestBehavior.AllowGet in the JsonResult.
public ActionResult LoadTree()
{
List<ListItem> list = new List<ListItem>() {
new ListItem() { Text = "Keyvan Nayyeri" },
new ListItem() { Text = "Simone Chiaretta" },
new ListItem() { Text = "Scott Guthrie" },
new ListItem() { Text = "Scott Hanselman" },
new ListItem() { Text = "Phil Haack" },
new ListItem() { Text = "Rob Conery" }
};
return new JsonResult { Data = list, JsonRequestBehavior = JsonRequestBehavior.AllowGet };
}
<script type="text/javascript">
$.ajax({
url: '/Home/LoadTree',
dataType: 'json',
data: {},
cache: false,
type: 'GET',
success: function (data) {
alert(data.length); // 6
// do whatever with the data
}
});
</script>

in success function you have to parse json to get actual data e.g.
var jsObject = JSON.parse(data);
and then access each item like jsObject.List[0].Text etc

Simple problem here. In your controller, you're actually assigning the list to a variable named Data inside the response data collection. Just because your success function takes a data parameter doesn't mean that the Data value you set in your controller automagically will become the data variable.
As your Data list is inside the data object: you need to do:
data.Data
inside your success function. Try this:
success: function(data) {
alert(data.Data.length);
}

function $.ajax() does not return value from server, so var text = $.ajax() will not work. You need to look at success handler instead
success: function (data) {
// data is the result of your ajax request
}
I strongly recommend you to read more at jQuery.Ajax
success(data, textStatus, jqXHR) A function to be
called if the request succeeds. The function gets passed three
arguments: The data returned from the server, formatted according to
the dataType parameter; a string describing the status; and the jqXHR
(in jQuery 1.4.x, XMLHttpRequest) object. As of jQuery 1.5, the
success setting can accept an array of functions. Each function will
be called in turn. This is an Ajax Event.