We Keep Coding

How to return a Json from a list in an api without the properties names in netcore

for some legacy code, I need to return a list of rows than come from a list of the element, but, the client needs it without the property name.
This is what I need. (I know that inside this JSON return, it's an array list then it's not a valid JSON, but is the way that needs to be received by the front end I don't know why
{ "success":true,"msg":"","draw":"1","recordsTotal":14,"recordsFiltered":14,
{ "data":
[
["Xiaomi","Redmi 8","10","6.0.1","","sadsadasd"],
["Xiaomi","Redmi 8","10","6.0.1","","sadsadasd"],
]
}
This is what I got now
{"success":true,"msg":"","draw":"1","recordsTotal":14,"recordsFiltered":14,
"data" :[
{"Brand":"Xiaomi","Model":"Redmi 8","Version":10,"App":"4.3.3","Phone":"","AsignedUSer":"ceererer"},
{"Brand":"Xiaomi","Model":"Redmi 8","Version":10,"App":"4.3.3","Phone":"","AsignedUSer":"ceererer"},
]
}
And this is the code how I am retrieving the data
return new JsonResult(new { success = true, msg = "", draw ="1", recordsTotal = listToReturn.Count(), recordsFiltered = listToReturn.Count() ,
data = listToReturn ,
});

You could project your list into arrays to extract the property values:
var data = listToReturn
.Select(d => new string[]{d.Brand, d.Model, d.Version, etc..})
.ToList();

Note that a "JSON" content without the property names will be a not valid JSON document.
What you need seems to be more like a CSV-like response.
Have you tried to format the result as CSV?

Custom Type Deserialize to 'object' results in extra curly brackets

I have a class like this:
class Document
{
public string id {get;set;}
public string name {get;set;}
}
var doc = new Document() { id= "1", name = "Doc1" };
var docs = new List<Document>() { doc };
...
I am sending docs through HTTP post to my backend service.
In my controller, I am receiving it as List docs.
The reason for this is, I want to use one controller to accept any Custom Types.
The trouble is, that, each item in List docs are wrapped inside extra curly braces
"{{\"id\":\"1\", \"name\":\"Doc1\"}}"
How to prevent extra curly braces? Can it be prevented?
If cannot be prevented, is there a way to extra the object removing the extra "{" and "}" ?

There is something called Newtonsoft.Json. It has whole lot of methods like Serialize and Deserialize objects. Check the link. Specially when you are sending values to the Api, The Api should accept the same thing as you are sending. If you are sending List then Api should accept same class List in its parameter.
If you are receiving some result from the API/you are consuming the API you should deserialize the string received in result.
To do this you can use -:
JObject,JToken
Newtonsoft.Json.JsonConvert.Deserialize

The actual output of serializing the list of documents would be:
[{"id":"1","name":"Doc1"}]
The outer [] is an array, and each object inside {id: number, name: string} is your document.
var doc = new Document { id = "1", name = "Doc1" };
var docs = new List<Document> { doc };
var result = Newtonsoft.Json.JsonConvert.SerializeObject(docs);
Console.WriteLine(result);

How to give a value for ViewBag inside the jquery in mvc c#

I have following input field.
<input class="book_now_modal BClick" type="text" id="destinationFrom_modal" name="destinationFrom_modal" placeholder="#ViewBag.AmritsarList[0].Destination">
time to time I want to change the value inside the view bag.is there a way to give dynamic value to the viewbag item.I have tried with jquery as below.
$(".AClick").click(function () {
//$(".BClick").attr("placeholder"," ");
var s = parseInt($(this).attr('id'));
var neededVAl = "##ViewBag.AmritsarList"+"["+s+"]"+".Destination";
alert(neededVAl);
var b = $(".BClick");
$(this).attr("placeholder",neededVAl);
});
like this I replace the placeholder as an alert it gives #ViewBag.AmritsarList[1].Destination but it didn't change the placeholder.how can I do that.

var neededVAl = "##ViewBag.AmritsarList"+"["+s+"]"+".Destination";
You can't access the ViewBag using above statement, since it accessible on server side. Your JavaScript statement is executed on the client side and can't directly access it.
However, You can use Json.Encode Method converts a data object to a string that is in the JavaScript Object Notation (JSON) format.
var jsObject = #Html.Raw(Json.Encode(ViewBag.AmritsarList));
$(".AClick").click(function () {
var s = parseInt($(this).attr('id'));
var neededVAl = jsObject[s].Destination;
alert(neededVAl);
$(this).attr("placeholder",neededVAl);
});

Accessing MVC's model property from Javascript

I have the following model which is wrapped in my view model
public class FloorPlanSettingsModel
{
public int Id { get; set; }
public int? MainFloorPlanId { get; set; }
public string ImageDirectory { get; set; }
public string ThumbnailDirectory { get; set; }
public string IconsDirectory { get; set; }
}
How do I access one of the above properties from Javascript?
I tried this, but I got "undefined"
var floorplanSettings = "#Model.FloorPlanSettings";
alert(floorplanSettings.IconsDirectory);

You could take your entire server-side model and turn it into a Javascript object by doing the following:
var model = #Html.Raw(Json.Encode(Model));
In your case if you just want the FloorPlanSettings object, simply pass the Encode method that property:
var floorplanSettings = #Html.Raw(Json.Encode(Model.FloorPlanSettings));

Contents of the Answer
1) How to access Model data in Javascript/Jquery code block in .cshtml file
2) How to access Model data in Javascript/Jquery code block in .js file
How to access Model data in Javascript/Jquery code block in .cshtml file
There are two types of c# variable (Model) assignments to JavaScript variable.
Property assignment - Basic datatypes like int, string, DateTime (ex: Model.Name)
Object assignment - Custom or inbuilt classes (ex: Model, Model.UserSettingsObj)
Lets look into the details of these two assignments.
For the rest of the answer lets consider the below AppUser Model as an example.
public class AppUser
{
public string Name { get; set; }
public bool IsAuthenticated { get; set; }
public DateTime LoginDateTime { get; set; }
public int Age { get; set; }
public string UserIconHTML { get; set; }
}
And the values we assign this Model are
AppUser appUser = new AppUser
{
Name = "Raj",
IsAuthenticated = true,
LoginDateTime = DateTime.Now,
Age = 26,
UserIconHTML = "<i class='fa fa-users'></i>"
};
Property assignment
Lets use different syntax for assignment and observe the results.
1) Without wrapping property assignment in quotes.
var Name = #Model.Name;
var Age = #Model.Age;
var LoginTime = #Model.LoginDateTime;
var IsAuthenticated = #Model.IsAuthenticated;
var IconHtml = #Model.UserIconHTML;
As you can see there are couple of errors, Raj and True is considered to be javascript variables and since they dont exist its an variable undefined error. Where as for the dateTime varialble the error is unexpected number numbers cannot have special characters, The HTML tags are converted into its entity names so that the browser doesn't mix up your values and the HTML markup.
2) Wrapping property assignment in Quotes.
var Name = '#Model.Name';
var Age = '#Model.Age';
var LoginTime = '#Model.LoginDateTime';
var IsAuthenticated = '#Model.IsAuthenticated';
var IconHtml = '#Model.UserIconHTML';
The results are valid, So wrapping the property assignment in quotes gives us valid syntax. But note that the Number Age is now a string, So if you dont want that we can just remove the quotes and it will be rendered as a number type.
3) Using #Html.Raw but without wrapping it in quotes
var Name = #Html.Raw(Model.Name);
var Age = #Html.Raw(Model.Age);
var LoginTime = #Html.Raw(Model.LoginDateTime);
var IsAuthenticated = #Html.Raw(Model.IsAuthenticated);
var IconHtml = #Html.Raw(Model.UserIconHTML);
The results are similar to our test case 1. However using #Html.Raw()on the HTML string did show us some change. The HTML is retained without changing to its entity names.
From the docs Html.Raw()
Wraps HTML markup in an HtmlString instance so that it is interpreted as HTML markup.
But still we have errors in other lines.
4) Using #Html.Raw and also wrapping it within quotes
var Name ='#Html.Raw(Model.Name)';
var Age = '#Html.Raw(Model.Age)';
var LoginTime = '#Html.Raw(Model.LoginDateTime)';
var IsAuthenticated = '#Html.Raw(Model.IsAuthenticated)';
var IconHtml = '#Html.Raw(Model.UserIconHTML)';
The results are good with all types. But our HTML data is now broken and this will break the scripts. The issue is because we are using single quotes ' to wrap the the data and even the data has single quotes.
We can overcome this issue with 2 approaches.
1) use double quotes " " to wrap the HTML part. As the inner data has only single quotes. (Be sure that after wrapping with double quotes there are no " within the data too)
var IconHtml = "#Html.Raw(Model.UserIconHTML)";
2) Escape the character meaning in your server side code. Like
UserIconHTML = "<i class=\"fa fa-users\"></i>"
Conclusion of property assignment
Use quotes for non numeric dataType.
Do Not use quotes for numeric dataType.
Use Html.Raw to interpret your HTML data as is.
Take care of your HTML data to either escape the quotes meaning in server side, Or use a different quote than in data during assignment to javascript variable.
Object assignment
Lets use different syntax for assignment and observe the results.
1) Without wrapping object assignment in quotes.
var userObj = #Model;
When you assign a c# object to javascript variable the value of the .ToString() of that oject will be assigned. Hence the above result.
2 Wrapping object assignment in quotes
var userObj = '#Model';
3) Using Html.Raw without quotes.
var userObj = #Html.Raw(Model);
4) Using Html.Raw along with quotes
var userObj = '#Html.Raw(Model)';
The Html.Raw was of no much use for us while assigning a object to variable.
5) Using Json.Encode() without quotes
var userObj = #Json.Encode(Model);
//result is like
var userObj = {"Name":"Raj",
"IsAuthenticated":true,
"LoginDateTime":"\/Date(1482572875150)\/",
"Age":26,
"UserIconHTML":"\u003ci class=\"fa fa-users\"\u003e\u003c/i\u003e"
};
We do see some change, We see our Model is being interpreted as a object. But we have those special characters changed into entity names. Also wrapping the above syntax in quotes is of no much use. We simply get the same result within quotes.
From the docs of Json.Encode()
Converts a data object to a string that is in the JavaScript Object Notation (JSON) format.
As you have already encountered this entity Name issue with property assignment and if you remember we overcame it with the use of Html.Raw. So lets try that out. Lets combine Html.Raw and Json.Encode
6) Using Html.Raw and Json.Encode without quotes.
var userObj = #Html.Raw(Json.Encode(Model));
Result is a valid Javascript Object
var userObj = {"Name":"Raj",
"IsAuthenticated":true,
"LoginDateTime":"\/Date(1482573224421)\/",
"Age":26,
"UserIconHTML":"\u003ci class=\"fa fa-users\"\u003e\u003c/i\u003e"
};
7) Using Html.Raw and Json.Encode within quotes.
var userObj = '#Html.Raw(Json.Encode(Model))';
As you see wrapping with quotes gives us a JSON data
Conslusion on Object assignment
Use Html.Raw and Json.Encode in combintaion to assign your object to javascript variable as JavaScript object.
Use Html.Raw and Json.Encode also wrap it within quotes to get a JSON
Note: If you have observed the DataTime data format is not right. This is because as said earlier Converts a data object to a string that is in the JavaScript Object Notation (JSON) format and JSON does not contain a date type. Other options to fix this is to add another line of code to handle this type alone using javascipt Date() object
var userObj.LoginDateTime = new Date('#Html.Raw(Model.LoginDateTime)');
//without Json.Encode
How to access Model data in Javascript/Jquery code block in .js file
Razor syntax has no meaning in .js file and hence we cannot directly use our Model insisde a .js file. However there is a workaround.
1) Solution is using javascript Global variables.
We have to assign the value to a global scoped javascipt variable and then use this variable within all code block of your .cshtml and .js files. So the syntax would be
<script type="text/javascript">
var userObj = #Html.Raw(Json.Encode(Model)); //For javascript object
var userJsonObj = '#Html.Raw(Json.Encode(Model))'; //For json data
</script>
With this in place we can use the variables userObj and userJsonObj as and when needed.
Note: I personally dont suggest using global variables as it gets very hard for maintainance. However if you have no other option then you can use it with having a proper naming convention .. something like userAppDetails_global.
2) Using function() or closure
Wrap all the code that is dependent on the model data in a function. And then execute this function from the .cshtml file .
external.js
function userDataDependent(userObj){
//.... related code
}
.cshtml file
<script type="text/javascript">
userDataDependent(#Html.Raw(Json.Encode(Model))); //execute the function
</script>
Note: Your external file must be referenced prior to the above script. Else the userDataDependent function is undefined.
Also note that the function must be in global scope too. So either solution we have to deal with global scoped players.

try this: (you missed the single quotes)
var floorplanSettings = '#Html.Raw(Json.Encode(Model.FloorPlanSettings))';

Wrapping the model property around parens worked for me. You still get the same issue with Visual Studio complaining about the semi-colon, but it works.
var closedStatusId = #(Model.ClosedStatusId);

I know its too late but this solution is working perfect for both .net framework and .net core:
#System.Web.HttpUtility.JavaScriptStringEncode()

For MVC 4
#model Inventory.Models.PurchaseVModel
#{
ViewData["Title"] = "Add";
Layout = "~/Views/Shared/_Layout.cshtml";
var jsonItems = new System.Web.Script.Serialization.JavaScriptSerializer().Serialize(Model.Items);
}
#section scripts{
<script>
$(document).ready(function () {
var allItem = #Html.Raw(jsonItems);
console.log(allItem);
});
</script>
}
.Net Core 3.1
#model Inventory.Models.PurchaseVModel
#{
ViewData["Title"] = "Add";
Layout = "~/Views/Shared/_Layout.cshtml";
var jsonItems = Newtonsoft.Json.JsonConvert.SerializeObject(Model.Items);
}
#section scripts{
<script>
$(document).ready(function () {
var allItem = #Html.Raw(jsonItems);
console.log(allItem);
});
</script>
}

I used the following to convert a Model object passed from the controller in the Razor view to JSON Object in JavaScript. This worked perfectly for me in ASP.Net Core.
<script>
let jsonData = #Html.Raw(Json.Serialize(Model))
console.log(jsonData)
</script>

In addition to #Rajshekar's thorough answer, I prefer a helper method that returns a IHtmlString value, which Razor recognizes as already-encoded HTML. Then, the Html.Raw() wrapper isn't needed, improving readability.
public static class JSHelper
{
/// <summary>
/// Encode a value as a JSON value or object for use in JavaScript code.
/// </summary>
/// <param name="value">Value to encode.</param>
/// <returns>HTML string containing the JavaScript value or object.</returns>
public static IHtmlString JsonEncode(object value)
{
return MvcHtmlString.Create(Json.Encode(value));
}
}
Then I can just use, obj = #JSHelper.JsonEncode(myObject); in my JavaScript section.
Include a using clause in your view or update view/web.config to resolve the namespace within the view.

So here is how we do it in .net core razor pages.
#section scripts
{
<script>
$(document).ready(function () {
leaveStatusDictionary = #Html.Raw(Json.Serialize(Model.LeaveStatusDictionary));
});
function GetStatusName(status) {
return window.leaveStatusDictionary[status];
}
</script>
}
Note the following.
I did not use var keyword before leaveStatusDictionary. So this now a property on the window object. So I was able to access that in a different js function - GetStatusName you see there.
LeaveStatusDictionary is a property on the model class of type Dictionary<int, string>.

If "ReferenceError: Model is not defined" error is raised, then you might try to use the following method:
$(document).ready(function () {
#{ var serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
var json = serializer.Serialize(Model);
}
var model = #Html.Raw(json);
if(model != null && #Html.Raw(json) != "undefined")
{
var id= model.Id;
var mainFloorPlanId = model.MainFloorPlanId ;
var imageDirectory = model.ImageDirectory ;
var iconsDirectory = model.IconsDirectory ;
}
});

posting JSON to MVC controller - String parameter is null

I am intentionally trying NOT to use a binding in the controller parameter, so I have a controller that looks like:
[HttpPost]
public ActionResult UntypedForm(String serializedformdata)
{
//// ...
}
When I post serialized JSON form elements to the controller with the below code:
var formelements = $('#form').serializeArray();
$.post(url, formelements, function (data) {
}, "json").error(function () {
alert("Error posting to " + url);
});
I get a NULL value for String serializedformdata on my controller. However, when I replace String serializedformdata with a strongly-typed object, binding works properly as expected.
The whole point of my controller is generic JSON posts, where I will create a BSON document to place into a Mongo database. SO....I intentionally DO NOT want model binding and I want the serialized string as pamameter. Why is my serializedformdata string null when I post?
Note - I also tried to bind to Dictionary with
public ActionResult UntypedForm(Dictionary<string,string> serializedformdata)
{
//// ...
}
but serializedformdata is still null.

The function serializeArray creates a Javascript object with the form's key/value pairs. You don't want that, you want a single key/value with serializedformdata = (JSON string). Ie, like this;
var formelements = { serializedformdata: JSON.stringify($('#form').serializeArray()) };
This passes the raw JSON string to the controller's parameter. You can use the JavaScriptSerializer to get the object on the server:
var obj = (List<Dictionary<string,string>>)new JavaScriptSerializer().Deserialize(serializedformdata, typeof(List<Dictionary<string,string>>));
Dictionary<string,string> dict = obj.First();
string someval = dict["somekey"];