Im constructing an array of objects like this:
var postData = [];
$.each(selectedFields, function (index, value) {
var testTitle = 'testing ' + index;
postData.push({title: testTitle, title2 : testTitle});
}
I then post it like this(note that i have tried a number of different aproaches):
$.post('SaveTitlesHandler.ashx', { form : postData }, function (data) {
console.log(data);
});
I then try to get the data in a handler...
public class SaveTitlesHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
string json = context.Request.Form.ToString();
}
}
I cant seem to get proper json out of the request. Anyone got any idea?
cheers.
twD
You are not posting JSON. You are using application/x-www-form-urlencoded. So inside the handler you could access individual values:
public void ProcessRequest(HttpContext context)
{
var title1 = context.Request["form[0][title]"];
var title2 = context.Request["form[0][title2]"];
var title3 = context.Request["form[1][title]"];
var title4 = context.Request["form[1][title2]"];
...
}
If you wanted to POST real JSON you need this:
$.ajax({
url: 'SaveTitlesHandler.ashx',
type: 'POST',
contentType: 'application/json; charset=utf-8',
data: JSON.stringify(postData),
success: function(result) {
console.log(result);
}
});
and then inside the handler read from the request input stream:
public void ProcessRequest(HttpContext context)
{
using (var reader = new StreamReader(context.Request.InputStream))
{
string json = reader.ReadToEnd();
}
}
The JSON.stringify method converts a javascript object into a JSON string and it is a native method built-in modern browsers. You might also need to include json2.js if you want to support older browsers.
Related
I want to send a class array with ajax but, when I make an ajax request, the request does not reach the backend side. When I sent a string array request. It works great. But If the Array contains a class, it is as if no request is made.
This is my javascript class:
var image_base64_code = [];
class images_base64 {
constructor(id, base64, name) {
this.id = id;
this.base64 = base64;
this.name = name;
}
}
//***************************************
// there are some codes here. For information.
//***************************************
image_base64_code.push(new images_base64(preview_intex, image_base64,name));
This is my ajax request:
$('#Ajax').click(function () {
var ImageJsonText = JSON.stringify({ image_base64_code: image_base64_code});
$.ajax({
url: 'main.aspx/ImageSave',
dataType: 'json',
type: 'POST',
data: ImageJsonText,
traditional: true,
contentType: 'application/json; charset=utf-8',
success: function (data) {
alert(data.d);
}
});
});
});
And my backend function:
[WebMethod]
public static bool ImageSave(RequestImage[] image_base64_code)
{
return 1;
}
public class RequestImage{
public string id;
public string base64;
public string name;
}
Use an object
var image_base64_code = {}; // object.
image_base64_code["images"] = [];
image_base64_code["images"].push( ... ); // add new here.
var ImageJsonText = JSON.stringify(image_base64_code);
JSON.stringify turns objects into strings, so change public static bool ImageSave(RequestImage[] image_base64_code) to accept a string.
public static bool ImageSave(string image_base64_code)
{
return 1;
}
Inside this method you can convert the string to RequestImage objects (deserialize) with built-in javascript deserializer or a library like JSON.NET (Newtonsoft).
Also see: JSON.stringify doesn't work with normal Javascript array
I am currently trying this, but I keep seeing the dreaded error:
Unexpected token o in JSON at position 1
I am struggling to find a solution and was wondering if anyone has any tips on how to solve this?
The class being serialized to JSON:
[Serializable]
public class GeoCoordinate
{
public GeoCoordinate()
{
}
[JsonProperty(PropertyName = "lat")]
public double Latitude { get; }
[JsonProperty(PropertyName = "long")]
public double Longitude { get; }
public GeoCoordinate(double latitude, double longitude)
{
Latitude = latitude;
Longitude = longitude;
}
public override string ToString()
{
return string.Format("{0},{1}", Latitude, Longitude);
}
}
Ajax call:
function getLocationData() {
jQuery.ajax({
url: abp.appPath + "Home/GetLocationsAsync",
type: "GET",
dataType: "json",
async: true,
success: function (data) {
var myArray = jQuery.parseJSON(data);
locations = [];
$.each(myArray, function (index, element) {
locations.push([element.lat, element.long]);
});
}
});
}
Controller:
[HttpGet]
public async Task<JsonResult> GetLocationsAsync()
{
var cords = await _practiceAppService.GetAllGeoCoordinates();
return Json(cords);
}
AppService:
public async Task<IList<GeoCoordinate>> GetAllGeoCoordinates()
{
var geoCoordinates = await Repository.GetAll()
.Where(x => !x.Disabled && !x.Latitude.Equals(0) && !x.Longitude.Equals(0))
.Select(x => new GeoCoordinate(x.Latitude, x.Longitude))
.ToListAsync();
return geoCoordinates;
}
Console.log of data before attempted call to parseJSON:
console.log(data);
var myArray = jQuery.parseJSON(data);
Coincidentally, there is a section called The ASP.NET Boilerplate Way that exactly addresses this.
Note that only point 2 is specific to ABP:
GetLocationsAsync returns a JSON object and not a string, so you should not call parseJSON.
You can reproduce the error message with: jQuery.parseJSON({});
ABP wraps JsonResult. From the documentation on AJAX Return Messages:
This return format is recognized and handled by the abp.ajax function.
You could use [DontWrapResult] attribute, but you might as well leverage on ABP here. abp.ajax handles the display of error messages if you throw a UserFriendlyException.
Since ajax is asynchronous, getLocationData cannot return locations directly.
You can return a chained Promise. If you're new to Promises, read Using Promises first.
There's a neater way than $.each and push.
You can use map.
Finally:
function getLocationData() {
return abp.ajax({
url: abp.appPath + "Home/GetLocationsAsync",
type: 'GET'
}).then(function (result) {
return result.map(function (element) {
return [element.lat, element.long];
});
});
}
Usage:
getLocationData().then(function (locations) {
console.log(locations);
});
ASP.NET Boilerplate wraps ASP.NET MVC action results by default if the return type is a JsonResult. So if you want to get the result you can disable wrapping. Try adding [DontWrapResult] attribute to the GetLocationsAsync method.
[DontWrapResult]
[HttpGet]
public async Task<JsonResult> GetLocationsAsync()
{
var cords = await _practiceAppService.GetAllGeoCoordinates();
return Json(cords);
}
PS: You don't need to add this attribute. You can get it from result field. Inspect the response via your browser's dev console to see how it's wrapped.
So basically Here is what I do:
in body - onload method I call this javascript function
function TestN() {
var list = new Array();
var allElements = document.getElementsByTagName('*');
$("*[wordNum]").each(function ()
{
var endRes = {
ControllerName: this.id,
WordNumber: this.getAttribute("wordNum")
};
list.push(endRes);
});
jQuery.ajax({
url:' #Url.Action("Translate")' ,
contentType: "application/json",
dataType: "json",
data: { List : JSON.stringify(list) }
,
traditional: true
})
}
what it does - it searches all the controlls with attribute "WrdNum" and then I make an ajax request to the MVC Translate action!
In the Translate Action I make a request to a web service which populates a list of type - TranslateModel
public ActionResult Translate(string List)
{
List<TranslateModel>listto = WebServiceBea.TranslateList(1, List);
return View(listto);
}
Also Here is my TranslateModel
public class TranslateModel
{
public string ControllerName { get; set; }
public string WordNumber { get; set; }
public string Description { get; set; }
}
So basically my question is -> what type should I return to a view - > and how to return this list to a javascript or jquery function which has to set the innerHtml property of some html controls with the record from this list.**
I now that it's strange but that's my task
EDIT
Thanks so much for the help. But now I've got another problem:
After I changed my javascript and put. Done method so I could get the data from the server it looks something like this :
$(document).ready(function () {
var list = new Array();
$("*[wordNum]").each(function () {
var endRes = {
ControllerName: this.id,
WordNumber: this.getAttribute("wordNum")
};
list.push(endRes);
});
jQuery.ajax({
url: ' #Url.Action("Translate")',
contentType: "application/json",
dataType: "json",
data: { List: JSON.stringify(list) }
,
traditional: true,
}).done(function (result)
{
alert ("HII") ;
});
});
no matter what I put in the .done function it never executes. It seems like the controller doesn't know where to return the result. |I| don't now. Can something happen from the fact that I'm making this request from the .layout page - on document ready. s
this looks like a greet place to use knockout js.
here is a great step by step for using knockout with the mvc view
so the method will only return json, the view will not have a model just a call to get the json
if you are going to use $.post to pull your data you could return your list as json
[AcceptVerbs(HttpVerbs.Get|HttpVerbs.Post)]
public ActionResult Translate(string List)
{
List<TranslateModel>listto = WebServiceBea.TranslateList(1, modelObj);
return Json(listto);
}
Looking at what you are posting to the action method, it should already be a list of that type. MVC should do the heavy lifting and transform it to the objects you have.
if however you would like to handle the return yourself you can do something like
jQuery.ajax({
url:' #Url.Action("Translate")' ,
contentType: "application/json",
dataType: "json",
data: { List : JSON.stringify(list) },
traditional: true
}).success(function( returnData, returnStatus)
{
//some code to handle the list of objects reutrned
});
You've already got an answer, but consider the following for cases where you may have controller actions called by javascript:
public ActionResult GetItems(string id)
{
var MyList = db.GetItems(id);//returns a list of items
if (Request.IsAjaxRequest())//called from javascript via AJAX
{
return Json(MyList, JsonRequestBehavior.AllowGet);
}
else //regular hyperlink click
{
return View(MyList);
}
}
To use the list, do the following
$.ajax({url: "'#Url.Content("~/controllername/GetItems")?id=' + id"})
.done(function(result){
var mylist = result.responseText.evalJSON();//this is your list of items
for(i=0;i<mylist .length;i++)
{
var myitem = mylist[i];
}
});
NEVERRRR NEVERRR Forge to put jsonRequestBehavior.AllowGet
Thanks alot for everyone for the help
I have a controller action that takes two objects as arguments. I can't get it to work at all they always come back as null. My latest try looks like below. I have tried many other variations. In this case the FormInfo class is a class with 2 properties that are types for Form1 and Form2. I have also tried having the controller take in the two classes as arguments and the data part looked like { form1: form1Data, form2: form2Data } that was not working as well. I also tried using JSON.stringify to form the data with no luck.
Looking in the network monitor I see the data going back to the server it's just the engine that MVC uses to decode the query string to the objects can't handle what I'm passing back.
Thanks in advance for any information!
ClientSide
var formData = $("#form1").serialize();
var formData2 = $("#form2").serialize();
var formInfo = new Object();
formInfo.FormData = formData;
formInfo.FormData2 = formData2;
$.ajax({
url: 'Controller/Action',
type: 'POST',
data: formInfo,
success: function (data) {
//do stuff
}
});
ServerSide
public ActionResult SaveForms(FormInfo formInfo)
{
//Do Stuff here
}
You could use the a JSON request in conjunction with the .serializeArray() jQuery method. Let's suppose that you have the following model:
public class FormInfo
{
public Form1Data Form1Data { get; set; }
public Form2Data Form2Data { get; set; }
}
where Form1Data and Form2Data are some completely arbitrary complex classes. Now on the client we suppose that you have 2 distinct forms (#form1 and #form2 whose input element names match your complex structures in terms of default model binder wire format). Sending an AJAX request and packing the 2 forms together becomes trivial:
var form1Data = {};
$.each($('#form1').serializeArray(), function () {
form1Data[this.name] = this.value;
});
var form2Data = {};
$.each($('#form2').serializeArray(), function () {
form2Data[this.name] = this.value;
});
$.ajax({
url: '#Url.Action("someaction", "somecontroller")',
type: 'post',
contentType: 'application/json; charset=utf-8',
data: JSON.stringify({
form1Data: form1Data,
form2Data: form2Data
}),
success: function (result) {
// TODO: do something with the result
}
});
And of course the controller action you are POSTing to looks like this:
[HttpPost]
public ActionResult SomeAction(FormInfo formInfo)
{
...
}
I am doing something like this but i have a object and other Formdata to pass my Controller
var discrepancy = self.newCptyReply();
if ($('#UploadFile')[0]) {
var upload = new FormData(),
file = $('#UploadFile')[0].files[0];
upload.append('id', self.globalMessageId());
upload.append('discrepancy', ko.toJSON(discrepancy));
upload.append('doc', file);
}
datacontext.saveCptyToReply(self, upload);
And in controller signature
public ActionResult SaveCptyToReply(Guid id, Trade discrepancy, HttpPostedFileBase doc)
But when it reaches Controller id , doc are ok but discrepancy is null... It has data when funciton is called..
What to do...
So I'm running GetServerUpdateProgress() in the controller from a $.ajax call on my page. While debugging I can confirm that the variable: myobj is being properly created and filled with the correct data.
But when on the $.ajax success, I'm not getting the data in json format, instead I'm getting
a string of "TrackerMVC.ClassLib.UpdateAJAXProgress" - the objects type.
I've done this in the past with a .svc webservice and didn't have any problems getting the object values using this exact same method.
Any ideas? Thanks!
method:
public UpdateAJAXProgress GetServerUpdateProgress()
{
string BASE_URL = "http://localhost:55094";
string url = BASE_URL + "/Home/UpdateProgress";
WebRequest wr = WebRequest.Create(url);
wr.Credentials = CredentialCache.DefaultNetworkCredentials; // uses current windows user
var myojb = new UpdateAJAXProgress();
var response = (HttpWebResponse)wr.GetResponse();
var reader = new StreamReader(response.GetResponseStream());
JavaScriptSerializer js = new JavaScriptSerializer();
var objText = reader.ReadToEnd();
myojb = (UpdateAJAXProgress)js.Deserialize(objText, typeof(UpdateAJAXProgress));
return myojb; // during debugging this object has the correct values in the correct format
}
class:
public class UpdateAJAXProgress
{
public int Completed { get; set; }
public int Total { get; set; }
}
javascript:
$.ajax({
type: "POST",
async: false,
url: '#(Url.Action("GetServerUpdateProgress","Charts"))',
contentType: "application/json; charset=utf-8",
success: function (data) {
console.log(data); // data being returned is: "TrackerMVC.ClassLib.UpdateAJAXProgress"
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(XMLHttpRequest.status);
alert(XMLHttpRequest.responseText);
}
});
You're misusing MVC.
You should declare your function as returning ActionResult, then return Json(myobj).
If you return a non-ActionResult from an MVC action, MVC will convert it to a string by calling ToString().