I have an ASP.Net MVC Application and I got a JSON response from the server using this code segment.
public JsonResult GetVehicleByID(string VehicleID)
{
db.Configuration.ProxyCreationEnabled = false;
var res = from type in db.Vehicles
where type.ID == VehicleID
select new
{
ID = type.ID,
RegNo = type.RegNo
};
return Json(res, JsonRequestBehavior.AllowGet);
}
The code above returns the following Json (Google Postman)
[
{
"ID": "000001",
"Type": "Internal"
}
]
I handled the response using following jQuery Ajax
function GetVehicle(id) {
$.ajax({
async: true,
url: "GetVehicleByID?VehicleID=" + id,
cache: false,
dataType: "json",
contentType: "application/json",
success: function (data) {
//Parsing Method 1
//var a = jQuery.parseJSON(data);
//console.log(a.Type);
//Parsing Method 2
var b = $.parseJSON(data);
console.log(b['Type']);
}
});
}
I was unable to extract the Type element from this response. There are several similar questions in the Stack Overflow & solutions of those questions are about parsing. I tried to parse in 2 ways but the browser log gives following error
Uncaught SyntaxError: Unexpected token o in JSON at position 1
Helping is highly appreciated than flagging this question as duplicate.
Try just console.log(data[0].Type). I believe jQuery is already parsing the response as JSON for you because you specified dataType: "json" and the response from the server had the right Content-Type header.
As #smarx said jQuery already decoded json for you, so you can access directly to the Type from the data variable, but if not, you can parse the json response with the JS function parse:
var json_data = JSON.parse(data);
console.log(json_data);
Related
I've almost viewed similar kind of questions but my problem has not solved yet.
I've following codes.
Controller
def create
#task_list = TaskList.new(task_list_params)
if #task_list.save
respond_to do |format|
format.json { render json: #task_list}
end
else
return
end
end
Ajax Script
$(document).on('click','.add', function(){
count = 0;
user_id = $('#user_id').val();
var name = $('.new-list').val();
var current = $(this);
if(name){
$.ajax({
method: 'POST',
url: action,
dataType: 'JSON',
data: {
task_list: {
name: name,
user_id: user_id
}
}
}).success(function(response){
var data = JSON.stringify(response);
alert(data.id);
$(current).parent().parent().parent().before(
'<div class="col-md-12">'+
''+name+''+
'</div>'
);
$(current).parent().parent().parent().remove();
$('.add-list').show();
});
}else{
alert('please add title');
}
});
I just want to take id of the record just saved to the database through ajax post request. Here, in success function it just alerts undefined and I don't know what's going wrong.
This is sample response.
.success(function(response){
alert(response.id);
Remove JSON.stringify from your success function. Response is already in JSON format you can directly get the value from it.
JSON.stringfy converts javascript object into string.
Explanation
Your response is already in JSON format and you have used dataType: "JSON" in your AJAX call. Which will make it possible to transfer JSON data between server and client.
When your response is already in JSON format you can use its property without parsing it. I.e response.id
If you have not used dataType: "JSON" and you are passing json encoded response from your controller to view file you have to first decode the response to get its values.
var d = $.parseJSON(response);
alert(d.id);
I have a JSON response as the follwoing, but my problem is there are some characters that is not related to the JSON response I want. So I have pass that JSON response to a JavaScript variable and look into the JSON string. That is at the bottom.
-----------JSON Response------------
{
"readyState":4,
"responseText":"<?xml version=\"1.0\"encoding=\"utf-8\"?>\r\n<string>{\"kind\":\"analytics#gaData\",\"id\":\"https://www.googleapis.com/analytics/v3/data/ga?ids=ga:76546294&dimensions=ga:userType&metrics=ga:users&start-date=2014-10-01&end-date=2014-10-23&max-results=10\",\"query\":{\"start-date\":\"2014-10-01\",\"end-date\":\"2014-10-23\",\"ids\":\"ga:76546294\",\"dimensions\":\"ga:userType\",\"metrics\":[\"ga:users\"],\"start-index\":1,\"max-results\":10},\"itemsPerPage\":10,\"totalResults\":2,\"selfLink\":\"https://www.googleapis.com/analytics/v3/data/ga?ids=ga:76546294&dimensions=ga:userType&metrics=ga:users&start-date=2014-10-01&end-date=2014-10-23&max-results=10\",\"profileInfo\":{\"profileId\":\"76546294\",\"accountId\":\"289147\",\"webPropertyId\":\"UA-289147-1\",\"internalWebPropertyId\":\"456104\",\"profileName\":\"US - Institutional Investors - NP Microsite\",\"tableId\":\"ga:76546294\"},\"containsSampledData\":false,\"columnHeaders\":[{\"name\":\"ga:userType\",\"columnType\":\"DIMENSION\",\"dataType\":\"STRING\"},{\"name\":\"ga:users\",\"columnType\":\"METRIC\",\"dataType\":\"INTEGER\"}],\"totalsForAllResults\":{\"ga:users\":\"1110\"},\"rows\":[[\"New Visitor\",\"826\"],[\"Returning Visitor\",\"284\"]]}</string>",
"status":200,
"statusText":"OK"
}
-----------End of JSON ------------
I want to remove these characters from the beginning of the string:
`{"readyState":4,"responseText":"<?xml version=\"1.0\"encoding=\"utf-8\"?>\r\n<string>`
And I want to remove these character from the end of the string:
`</string>","status":200,"statusText":"OK"}`
So I want to remove these characters. I think a set of JavaScript String functions to be used. But I don't know how to mix them and use.
Could someone help me to solve this matter?
Thanks and regards,
Chiranthaka
UPDATE
I have used the follwoing AJAX function to send and get the JSON response back.
function setJsonSer() {
formData = {
'Email': 'clientlink#site.com',
'Password': 'password1234',
'URL': getVaria()
};
$.ajax({
url: "/APIWebService.asmx/AnalyticsDataShowWithPost",
type: 'POST',
data: formData,
complete: function(data) {
var jsonResult = JSON.stringify(data);
alert(JSON.stringify(data));
Load(data);
}
});
}
UPDATE 02
function setJsonSer() {
formData = {
'Email': 'clientlink#russell.com',
'Password': 'russell1234',
'URL': getVaria()
};
$.ajax({
url: "/APIWebService.asmx/AnalyticsDataShowWithPost",
type: 'POST',
data: formData,
dataType: 'json',
complete: function(data) {
var jsonResult = JSON.stringify(data);
alert(jsonResult);
Load(data);
}
});
}
I looked at your code:
complete: function(data) {
var jsonResult = JSON.stringify(data);
alert(jsonResult);
Load(data);
}
So you want to stringify your customized result, but your result is not well parsed JSON*? If yes then:
complete: function(data) {
var responseText = data.responseText;
var responseJson = JSON.parse(responseText.match(/[{].*.[}]/));
// you can skip `JSON.parse` if you dont want to leave it as `String` type
alert(JSON.stringify(responseJson)); //or just `responseJson` if you skip `JSON.parse`
Load(JSON.stringify(responseJson));
}
This can solve your problem for a while. But I think the problem is in your backend which did not serve well parsed JSON data. My recommendation is fixing your backend system first.
*Not well parsed JSON because your result some kind of including XML type of string under JSON object.
You have to parse JSON to get stuff which is inside it (You have
done this)
You have to parse the XML to get text which is inside the XML
Here's sample code for XML parsing:
http://www.w3schools.com/xml/tryit.asp?filename=tryxml_parsertest2
I'm trying to send JSON data to my web server via jQuery and I'm running into an error.
Uncaught TypeError: Cannot use 'in' operator to search for 'context' in {"id":45,"isRead":true}
code I am testing:
var obj = {};
obj.id = 45;
obj.isRead = true;
var data = JSON.stringify(obj);
var url = "/notification/read"
$.ajax(url, data, 'application/json', function() {
// code remove notification from the DOM
});
});
Is there a better or more correct way to do this? Not sure if I'm getting the params right on the $.ajax call either.
UPDATE
code I got to work
var obj = {
id: 45,
isRead: true
};
var json = JSON.stringify(obj);
var url = "/notification/read"
$.ajax({ url: url,
type:'POST',
contentType: 'application/json',
data: json,
success: function(data, textStatus) {
// do stuff
}
});
My server was expecting JSON data POSTed as application/json. So was I wrong in thinking I needed all these variables? without these it was sent as a GET and was application/x-www-form-urlencoded. Without the stringify it also didn't work.
You are passing too many arguments to the ajax function: http://api.jquery.com/jQuery.ajax/
Also, the JSON.stringify call is not necessary, jQuery will take care of that for you.
var obj = {
'id':45,
'isRead':true
};
$.ajax({
url: "/notification/read",
data: obj,
success: function(data, textStatus){
/* code here */
}
});
$.ajax(url, obj);
You need to send an object as second param
{success: success, data: data}
Documentation is here:
http://api.jquery.com/jQuery.ajax/
You have to pass parameters as one object, not multiple ones
I want to pass a javascript array to a php page using ajax POST request .How to achieve this.please help..Thanks in advance
Have a look into JSON encoding.
In PHP you can decode it using json_decode, not quite sure how you'll encode it in Javascript but it is possible
http://en.wikipedia.org/wiki/JSON
using jQuery
$.post("test.php", { 'choices[]': ["Jon", "Susan"] });
Edit
if you are creating ajax object and using it then I'll suggest to convert your data in query string send it through ajax object.
like :
var userdetails = [1,2,3,4];
var queryString = "";
for(i=0; i<userdetails.length; i++){
queryString = queryString + 'userdetails[]='+userdetails[i]+'&';
}
connect.send(queryString)
example posting with json
var array = [1,2,3,4,5,6];
$.ajax({
url: "mydomain.com/url",
type: "POST",
dataType: "json",
data: {arrayName: array},
complete: function() {
//called when complete
},
success: function() {
//called when successful
},
error: function() {
//called when there is an error
},
});
Then the json could be parsed server side.
arrays can also be sent using application/x-www-form-urlencoded - this is the default format for submitting.
Been getting a "parsererror" from jquery for an Ajax request, I have tried changing the POST to a GET, returning the data in a few different ways (creating classes, etc.) but I cant seem to figure out what the problem is.
My project is in MVC3 and I'm using jQuery 1.5
I have a Dropdown and on the onchange event I fire off a call to get some data based on what was selected.
Dropdown: (this loads the "Views" from the list in the Viewbag and firing the event works fine)
#{
var viewHtmls = new Dictionary<string, object>();
viewHtmls.Add("data-bind", "value: ViewID");
viewHtmls.Add("onchange", "javascript:PageModel.LoadViewContentNames()");
}
#Html.DropDownList("view", (List<SelectListItem>)ViewBag.Views, viewHtmls)
Javascript:
this.LoadViewContentNames = function () {
$.ajax({
url: '/Admin/Ajax/GetViewContentNames',
type: 'POST',
dataType: 'json',
data: { viewID: $("#view").val() },
success: function (data) {
alert(data);
},
error: function (data) {
debugger;
alert("Error");
}
});
};
The above code successfully calls the MVC method and returns:
[{"ViewContentID":1,"Name":"TopContent","Note":"Content on the top"},
{"ViewContentID":2,"Name":"BottomContent","Note":"Content on the bottom"}]
But jquery fires the error event for the $.ajax() method saying "parsererror".
I recently encountered this problem and stumbled upon this question.
I resolved it with a much easier way.
Method One
You can either remove the dataType: 'json' property from the object literal...
Method Two
Or you can do what #Sagiv was saying by returning your data as Json.
The reason why this parsererror message occurs is that when you simply return a string or another value, it is not really Json, so the parser fails when parsing it.
So if you remove the dataType: json property, it will not try to parse it as Json.
With the other method if you make sure to return your data as Json, the parser will know how to handle it properly.
See the answer by #david-east for the correct way to handle the issue
This answer is only relevant to a bug with jQuery 1.5 when using the file: protocol.
I had a similar problem recently when upgrading to jQuery 1.5. Despite getting a correct response the error handler fired. I resolved it by using the complete event and then checking the status value. e.g:
complete: function (xhr, status) {
if (status === 'error' || !xhr.responseText) {
handleError();
}
else {
var data = xhr.responseText;
//...
}
}
You have specified the ajax call response dataType as:
'json'
where as the actual ajax response is not a valid JSON and as a result the JSON parser is throwing an error.
The best approach that I would recommend is to change the dataType to:
'text'
and within the success callback validate whether a valid JSON is being returned or not, and if JSON validation fails, alert it on the screen so that its obvious for what purpose the ajax call is actually failing. Have a look at this:
$.ajax({
url: '/Admin/Ajax/GetViewContentNames',
type: 'POST',
dataType: 'text',
data: {viewID: $("#view").val()},
success: function (data) {
try {
var output = JSON.parse(data);
alert(output);
} catch (e) {
alert("Output is not valid JSON: " + data);
}
}, error: function (request, error) {
alert("AJAX Call Error: " + error);
}
});
the problem is that your controller returning string or other object that can't be parsed.
the ajax call expected to get Json in return. try to return JsonResult in the controller like that:
public JsonResult YourAction()
{
...return Json(YourReturnObject);
}
hope it helps :)
There are lots of suggestions to remove
dataType: "json"
While I grant that this works it's ignoring the underlying issue. If you're confident the return string really is JSON then look for errant whitespace at the start of the response. Consider having a look at it in fiddler. Mine looked like this:
Connection: Keep-Alive
Content-Type: application/json; charset=utf-8
{"type":"scan","data":{"image":".\/output\/ou...
In my case this was a problem with PHP spewing out unwanted characters (in this case UTF file BOMs). Once I removed these it fixed the problem while also keeping
dataType: json
Your JSON data might be wrong. http://jsonformatter.curiousconcept.com/ to validate it.
Make sure that you remove any debug code or anything else that might be outputting unintended information. Somewhat obvious, but easy to forgot in the moment.
I don't know if this is still actual but problem was with Encoding. Changing to ANSI resolved the problem for me.
If you get this problem using HTTP GET in IE I solved this issue by setting the cache: false.
As I used the same url for both HTML and json requests it hit the cache instead of doing a json call.
$.ajax({
url: '/Test/Something/',
type: 'GET',
dataType: 'json',
cache: false,
data: { viewID: $("#view").val() },
success: function (data) {
alert(data);
},
error: function (data) {
debugger;
alert("Error");
}
});
you should remove the dataType: "json". Then see the magic... the reason of doing such thing is that you are converting json object to simple string.. so json parser is not able to parse that string due to not being a json object.
this.LoadViewContentNames = function () {
$.ajax({
url: '/Admin/Ajax/GetViewContentNames',
type: 'POST',
data: { viewID: $("#view").val() },
success: function (data) {
alert(data);
},
error: function (data) {
debugger;
alert("Error");
}
});
};
incase of Get operation from web .net mvc/api, make sure you are allow get
return Json(data,JsonRequestBehavior.AllowGet);
If you don't want to remove/change dataType: json, you can override jQuery's strict parsing by defining a custom converter:
$.ajax({
// We're expecting a JSON response...
dataType: 'json',
// ...but we need to override jQuery's strict JSON parsing
converters: {
'text json': function(result) {
try {
// First try to use native browser parsing
if (typeof JSON === 'object' && typeof JSON.parse === 'function') {
return JSON.parse(result);
} else {
// Fallback to jQuery's parser
return $.parseJSON(result);
}
} catch (e) {
// Whatever you want as your alternative behavior, goes here.
// In this example, we send a warning to the console and return
// an empty JS object.
console.log("Warning: Could not parse expected JSON response.");
return {};
}
}
},
...
Using this, you can customize the behavior when the response cannot be parsed as JSON (even if you get an empty response body!)
With this custom converter, .done()/success will be triggered as long as the request was otherwise successful (1xx or 2xx response code).
I was also getting "Request return with error:parsererror." in the javascript console.
In my case it wasn´t a matter of Json, but I had to pass to the view text area a valid encoding.
String encodedString = getEncodedString(text, encoding);
view.setTextAreaContent(encodedString);
I have encountered such error but after modifying my response before sending it to the client it worked fine.
//Server side
response = JSON.stringify('{"status": {"code": 200},"result": '+ JSON.stringify(result)+'}');
res.send(response); // Sending to client
//Client side
success: function(res, status) {
response = JSON.parse(res); // Getting as expected
//Do something
}
I had the same problem, turned out my web.config was not the same with my teammates.
So please check your web.config.
Hope this helps someone.
I ran into the same issue. What I found to solve my issue was to make sure to use double quotes instead of single quotes.
echo "{'error':'Sorry, your file is too large. (Keep it under 2MB)'}";
-to-
echo '{"error":"Sorry, your file is too large. (Keep it under 2MB)"}';
The problem
window.JSON.parse raises an error in $.parseJSON function.
<pre>
$.parseJSON: function( data ) {
...
// Attempt to parse using the native JSON parser first
if ( window.JSON && window.JSON.parse ) {
return window.JSON.parse( data );
}
...
</pre>
My solution
Overloading JQuery using requirejs tool.
<pre>
define(['jquery', 'jquery.overload'], function() {
//Loading jquery.overload
});
</pre>
jquery.overload.js file content
<pre>
define(['jquery'],function ($) {
$.parseJSON: function( data ) {
// Attempt to parse using the native JSON parser first
/** THIS RAISES Parsing ERROR
if ( window.JSON && window.JSON.parse ) {
return window.JSON.parse( data );
}
**/
if ( data === null ) {
return data;
}
if ( typeof data === "string" ) {
// Make sure leading/trailing whitespace is removed (IE can't handle it)
data = $.trim( data );
if ( data ) {
// Make sure the incoming data is actual JSON
// Logic borrowed from http://json.org/json2.js
if ( rvalidchars.test( data.replace( rvalidescape, "#" )
.replace( rvalidtokens, "]" )
.replace( rvalidbraces, "")) ) {
return ( new Function( "return " + data ) )();
}
}
}
$.error( "Invalid JSON: " + data );
}
return $;
});
</pre>