I have a bit of code where I'm trying to send a Viewmodel back to the controller using Ajax post. If I write the code one way, it passes correctly, and another way it returns null or 0 values within the viewmodel.
The way that works:
$(document).ready(function () {
$(".boxItem").change(function (event) {
var url = "/Search/GetBoxChangeInfo";
$.post(url, #Html.Raw(Json.Encode(Model)), function (data) {
$("#column-1").html(data);
});
});
});
And the way that returns null values:
$(document).ready(function () {
$(".boxItem").change(function (event) {
var url = "/Search/GetBoxChangeInfo";
$.post(url, { json: #Html.Raw(Json.Encode(Model)) }, function (data) {
$("#column-1").html(data);
});
});
});
i need to use it the second way because I need to also pass parameters back about the selected value and ID, so it will look something like:
$(document).ready(function () {
$(".boxItem").change(function (event) {
var str = $(this).attr('id');
var num = $(this).val();
var url = "/Search/GetBoxChangeInfo";
$.post(url, { json: #Html.Raw(Json.Encode(Model)), id : str, selected : num }, function (data) {
$("#column-1").html(data);
});
});
});
My controller looks like this btw:
[HttpPost]
public ActionResult GetBoxChangeInfo(EventViewModel json)
{
//stuff
}
EDIT - as requested, here is EventViewModel structure
[JsonObject(MemberSerialization.OptIn)]
public class EventViewModel
{
public int EventNumber { get; set; }
public List<EventItemsViewModel> EventItems { get; set; }
public List<LocationViewModel> Locations { get; set; }
public int StartLocationID { get; set; }
public bool Outbound { get; set; }
public List<int> SelectedEvents { get; set; }
public List<DurationsViewModel> Durations { get; set; }
}
Anyone know why this might be happening? Is there a limit to home much can be sent to the controller this way - it is quite a complex viewmodel, so wondered if that could be someting to do with it.
Thanks
Like this:
$(document).ready(function () {
$('.boxItem').change(function (event) {
var str = $(this).attr('id');
var num = $(this).val();
var url = '#Url.Action("GetBoxChangeInfo", "Search")';
$.ajax({
url: url,
contentType: 'application/json',
data: JSON.stringify({
json: #Html.Raw(Json.Encode(Model)),
id: str,
selected: num
}),
success: function(data) {
$("#column-1").html(data);
}
});
});
});
Things to notice:
contentType: 'application/json'
JSON.stringify to convert the object into a JSON string
var url = '#Url.Action("GetBoxChangeInfo", "Search")'; to avoid hardcoding urls
Is there a limit to home much can be sent to the controller this way - it is quite a complex viewmodel, so wondered if that could be someting to do with it.
Yes there is and it's 1000 HTTP Collection keys and you can configure that yourself in the web.config. Try setting the value to 4000 first, then you can lower it a bit if you like. Try this:
<appSettings>
<add key="aspnet:MaxHttpCollectionKeys" value="4000" />
</appSettings>
Use this
http://api.jquery.com/jQuery.post/
$.ajax({
type: 'POST',
url: url,
data: data,
success: success,
dataType: dataType
});
, I mean not shorthand Axaj Call. You have options like "success", "error", "completed" and can isolate issue.
I encountered the same error on ASP.NET MVC. On your model, you put ConvertEmptyStringToNull = false on your model's property's attribute:
[DisplayFormat(ConvertEmptyStringToNull = false)]
E.g.
public class Person
{
[DisplayFormat(ConvertEmptyStringToNull = false)]
public string Lastname { get; set; }
[DisplayFormat(ConvertEmptyStringToNull = false)]
public string Firstname { get; set; }
[DisplayFormat(ConvertEmptyStringToNull = false)]
public string Middlename { get; set; }
}
I documented when I encountered the same thing at this post: http://www.ienablemuch.com/2011/08/empty-string-is-empty-string.html
Related
I have a checkboxlistfor control in mvc 5 and want the value of the selected checkbox, once I get the value then send ajax request and fetch the data as per id,
below is the reference link where similar kind of functionality is achieved, in this he has used "for loop" for multiple checkboxes, and I am using checkboxlistfor, using this I am not able to get the value of the selected checkbox.
"https://forums.asp.net/t/2078931.aspx?How+to+get+data+from+checkbox+list+using+jquery+ajax+in+MVC+"
Below is the code I am using to bind checkboxlistfor code
view
#Html.CheckBoxListFor(model => model.sbuIDs,
model => model.Availablesbu,
sb => sb.sbuID,
sb => sb.sbuName,
model => model.Selectedsbu,
htmlListInfo)
controller code
[HttpGet]
public ActionResult AddUsers()
{
var Uvm = new UsersViewModel();
var Selectedsbu = new List<sbu>();
Uvm.Availablesbu = _User.Getallsbu();
Uvm.Selectedsbu = Selectedsbu;
return View(Uvm);
}
public class sbu
{
public int UserID { get; set; }
public int sbuID { get; set; }
public string sbuName { get; set; }
}
public class UsersViewModel()
{
public IEnumerable<sbu> sbu = null;
sbu = new List<sbu>();
public IEnumerable<sbu> Availablesbu { get; set; }
public IEnumerable<sbu> Selectedsbu { get; set; }
public string[] sbuIDs { get; set; }
}
Update
Below is the ajax request i will use:
<script>
$("#CheckBoxListFor").change(function () {
debugger;
var favorite = [];
$.each($("input[name='sbuIDs']:checked"), function () {
favorite.push($(this).val());
});
$.ajax({
type: "POST",
dataType: "json",
contentType: "application/json",
url: '#Url.Action("Getvalues", "Home")',
data: JSON.stringify({ values: favorite })
});
});
</script>
Controller code
public JsonResult Getvalues(string[] values)
{
//
}
Rendered in HTML a check box list will have a shared name but will have different ids being the name followed by a - and a number identifying the index.
You can use jQuery to get a list of those selected.
$('[name="checkBoxListName"]:checked');
To get an array of their values:
var values = $('[name="checkBoxListName"]:checked').get();
Your sample script should work with some minor changes. 1) use the name selector as your checkboxes will have different ids. 2) Wrap the code in $(document).ready. 3) Just post the raw object and not a string:
<script>
$(document).ready(function() {
$("[name='checkBoxListName']).change(function () {
// code here.
data: { values: favorite }
});
});
</script>
Below is the ajax request i have use
<script>
$("#CheckBoxListFor").change(function () {
debugger;
var favorite = [];
$.each($("input[name='sbuIDs']:checked"), function () {
favorite.push($(this).val());
});
$.ajax({
type: "POST",
dataType: "json",
contentType: "application/json",
url: '#Url.Action("Getvalues", "Home")',
data: JSON.stringify({ values: favorite })
});
});
</script>
Controller code
public JsonResult Getvalues(string[] values)
{
....
}
I can't figure out why my action param is coming through null. I'm also not sure of how to even diagnose the issue. I can see the http request data being sent with data and stepping through the debugger shows the object as null, not sure how to see the steps in between.
Models
public class ComplexObj
{
public int Id { get; set; }
public int Test1 { get; set; }
public decimal Test2 { get; set; }
}
public class BiggerObj
{
public BiggerObj()
{
ComplexObj = new List<ComplexObj>();
}
public long OtherId { get; set; }
public string Name { get; set; }
public ICollection<ComplexObj> ComplexObjs { get; set; }
}
Action
[HttpPost]
public void TestAction(BiggerObj[] biggerObjs)
{
...// biggerObjs is null :(
}
View
function ajaxCall() {
var data = [];
var bigObj = new Object();
bigObj.OtherId = 123;
bigObj.Name = "TestName";
bigObj.ComplexObj = [];
var complexObj = new Object();
complexObj.Id = 789;
complexObj.Test1 = 123;
complexObj.Test2 = 456;
bigObj.ComplexObj.push(complexObj);
data.push(bigObj);
}
}
$.ajax({
url: SITEROOT + "myController/TestAction",
cache: false,
type: 'POST',
data: data,
complete: function() {
alert('done');
}
});
}
Solved
You must use:
JSON.stringify and declare the contentType as "application/json; charset=utf-8"
Parse the decimal value by using parseFloat() function, decimal is considered as int by default binder.
Change your Action to this:
[HttpPost]
public ActionResult TestAction(BiggerObj[] biggerObjs)
{
...// biggerObjs is null :(
}
Change your ajaxCall function to this:
//ajaxCall
function ajaxCall() {
var data = [];
var bigObj = {
OtherId : 123,
Name : "TestName",
ComplexObjs : new Array()
};
var ComplexObjs = {
Id: 789,
Test1: 123,
Test2: parseFloat(456)
// decimal types are considered an integer, you have to parse
};
bigObj.ComplexObjs.push(ComplexObjs);
data.push(bigObj);
$.ajax({
url:"/Test/TestAction",
cache: false,
type: 'POST',
data: JSON.stringify(data),
contentType: "application/json; charset=utf-8",
complete: function () {
alert('done');
}
});
}
I tested, works fine.
have tried the methods found but still cannot seem to tackle the issue.
am passing a list of object via Jquery Aja but it seems that the controller is receiving null values (it is recognizing the list count fine).
the jquery code is as follows:
var xmlids = Array();
for (var i = 0; i < orderId.length; i++) {
var xdata = {
"XmlOid": "" +orderId[i] + "",
"CourierCompany": $("#CourierCompany_"+orderId[i]).val() ,
"CourierService": $("#CourierService_" + orderId[i]).val(),
"StoreId" : storeId
};
xmlids.push(xdata);
}
var data = { invoices: xmlids };
$.ajax({
url: purl,
type: "POST",
dataType: "json",
//contentType: "application/json;",
async: false,
data: data,
The controller param is :
public JsonResult ProcessSaleOrder(List<XMLInvoiceGeneration> invoices)
the object is as follows:
public class XMLInvoiceGeneration
{
public Int64 XmlOid { get; set; }
public string CourierCompany { get; set; }
public string CourierService { get; set; }
public Int64? StoreId { get; set; }
}
any help appreciated.
I tried to replicate your problem.
I created a new ASP.NET MVC web application, and in the Home controller's Index view, I added the following
<input type="button" id="send" value="Send" />
#section scripts{
<script type="text/javascript">
$(function () {
$("input#send").on("click", function () {
var xmlids = Array();
for (var i = 0; i < 2; i++) {
var xdata = {
"XmlOid": 1,
"CourierCompany": "TempData",
"CourierService": "Temp",
"StoreId": 2
};
xmlids.push(xdata);
}
var data = { invoices: xmlids };
$.ajax({
url: "/Home/ProcessSaleOrder",
type: "POST",
dataType: "json",
async: false,
data: data
});
});
})
</script>
}
I basically created some temp data, but trying to still use your original idea. My controller looks like this:
[HttpPost]
public ActionResult ProcessSaleOrder(List<XMLInvoiceGeneration> invoices)
{
return new EmptyResult();
}
When I click the button, and hit the breakpoint in the controller, the invoices parameter contains 2 items, both with the values I set in the JavaScript code. I'm not sure why your code isn't working, but maybe you can use mine as a template to help you narrow down what the issue is.
Try this
uncomment //contentType: "application/json;",
And send data with JSON.stringify(data)
data: JSON.stringify(data)
PS: Best practice for url : url: "#Url.Action("method","controller")"
I had the same issue on sending a List to the controller. After a lot of effort, I found the reason why it is sending as null. It's the fields with Return Type(Class) that are not added with {get; set; }
$.ajax({
url: "/Home/CreateTasks",
data: ko.toJSON({Id: this.Id, tasks: objList }),
type: "POST",
dataType: "json",
processData: true,
contentType: "application/json; charset=utf-8",
success: data => {
}
And my Model Class is:
After
public class TaskFields
{
public string Title { get; set; }
public string Activity { get; set; }
}
public class CreateTaskInput
{
public int Id { get; set; }
public TaskFields TaskProperties { get; set; }
}
Before it was:
public class TaskFields
{
public string Title;
public string Activity;
}
public class CreateTaskInput
{
public int Id;
public TaskFields TaskProperties;
}
And My Controller Method is:
[HttpPost]
public JsonResult MethodName(int Id, List<CreateTaskInput> tasks)
{
}
I am not sure this answer will help you. But it may help someone who has a similar mistake. Thanks!
Add [FromBody] to the parameters in action
[HttpPost]
public ActionResult ProcessSaleOrder([FromBody] List<XMLInvoiceGeneration> invoices)
{
return new EmptyResult();
}
I have an .aspx page that we are loading UserControls into dynamically at runtime. Each user control has some sort of textbox or combo or some other control. This all works fine. when we go to read the values out of the controls when the user presses search, we cannot do this directlly from C# code behind because the page does not know they are there. my solution is to read the values with JQuery and make an ajax call where I can set the values in a session variable for use when the user gets to the next page. I am having trouble with the JSon specifically.
I keep getting the error:
{"Message":"Cannot convert object of type \u0027System.String\u0027 to type \u0027System.Collections.Generic.IDictionary`2[System.String,System.Object]\u0027","StackTrace":"
I find all the controls using .each and get the values for the JSon call:
function SaveFields() {
var data = [];
//get Search field criteria
$('[id^=Search_ucField_]').each(function (index, value) {
var field = $(this);
var id = $(this).attr('id').split("_")[2];
var fieldValue = $(this).val();
if (field.is('input')) {
var item = {};
item['FieldID'] = id;
item['Criteria'] = fieldValue;
item['IsActive'] = 1;
item['FieldCategoryID'] = '1';
item['ControlPath'] = '~/Controls/Search/TextBox.aspx';
item['CategoryID'] = 1;
data.push(item);
}
});
$.ajax({
url: '/Ajax/Ajax.aspx/DoSearch',
type: 'POST',
data: JSON.stringify(data),
datatype: 'json',
contentType: 'application/json',
success: function (msg) {
console.log(msg);
},
error: function (xhr, textStatus, errorThrown) {
alert('Error! Status = ' + xhr.status);
}
});
}
Here is the object I am trying to deserialize into:
[DataContract]
public class SearchFields
{
[DataMember]
public List<SearchField> Field { get; set; }
}
[DataContract]
public class SearchField
{
[DataMember]
public string FieldID { get; set; }
[DataMember]
public bool IsActive { get; set; }
[DataMember]
public string Criteria { get; set; }
[DataMember]
public int FieldCategoryID { get; set; }
[DataMember]
public string ControlPath { get; set; }
}
Here is the WebMethod
[WebMethod]
public static string DoSearch(string Fields)
{
var sf = new SearchFields();
sf = JsonConvert.DeserializeObject<SearchFields>(Fields);
//save into session variable
SVars.NewUISearch.LastSearchFields = sf;
string x;
x = "until this works, this is a static response";
return x;
}
finally, here is a sample of the JSon that is being sent:
[{"FieldID":"52","getCriteria":"Bobs your uncle","IsActive":1,"FieldCategoryID":"1","ControlPath":"~/Controls/Search/TextBox.aspx"}]
Where am I going wrong here? Thanks in advance!
I couldn't get $('form').serialize() to work so this is what I did. Make sure the properties you define in model represent the properties in your model and are strongly typed.
var model = {
MyString: $("#MyString").val(),
MyNumber: $("#MyNumber").val(),
IsCheck: $("CHK").val()
};
$.ajax({
type: "POST",
url: "/Testing/Index",
contentType: "application/json",
data: JSON.stringify(model),
dataType: "json",
success: function (data) {
// Good stuff
},
error: function (data) {
// Bad stuff
}
})
Hi I'm new to JavaScript and MVC, and I'm trying to pass List and string to my controller.
JavaScript looks like:
var parms = {
globalList: globalList,
fieldName: fieldName
};
$.ajax({
//contentType: 'application/json; charset=utf-8',
type: "POST",
traditional: true,
url: "/Home/SaveField",
async: false,
data: parms,
dataType: "json",
success: function (data) {
console.log("uspjeh");
},
error: function (errorData) {
console.log("errors");
}
});
});
and controller looks like:
public void SaveField(List<Point> globalList, String fieldName)
{
// filedName is correctly passed
// list is null
}
can somebody help me please?
Point class:
public class Point
{
[Key]
public int PointId { get; set; }
public float GeoDuzina { get; set; }
public float GeoSirina { get; set; }
[ForeignKey("Data")]
public int DataId { get; set; }
public virtual Data Data { get; set; }
}
It wont work. If you debug a little then you will see that you post to server something like this:
globalList:[object Object]
globalList:[object Object]
globalList:[object Object]
It is just array of strings. But there is a way to do what you want.
You can serialize your array to json and then deserialize it in your controller. Just change your param to:
var parms = {
globalList: JSON.stringify(globalList),
fieldName: fieldName
};
And action:
[HttpPost]
public void SaveField(string globalList, string fieldName)
{
var serializer = new JavaScriptSerializer(); //use any serializer you want
var list = serializer.Deserialize<List<Point>>(globalList);
}
Or you can make param object looks like from HTML form:
var parms = {
"globalList[0].GeoDuzina": 51.506760996586294,
"globalList[0].GeoSirina": -0.06106463202740998,
"globalList[1].GeoDuzina": 51.516269286402846,
"globalList[1].GeoSirina": -0.056258113472722464,
"globalList[2].GeoDuzina": 51.50419662363912,
"globalList[2].GeoSirina": -0.044413478462956846,
fieldName: fieldName
};
It works with your action.
There are many other ways to do that. I just show two of them. Is any good for you?
btw. This numbers are too long for floats.;)