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POST file list to controller in ajax post

I tried to upload documents but I couldnt pass to list my controllers parameter. My scenario is:
user click to "choose file" button and pick the files and press done
then my some functions get file list and pass to controller for save locally via POST merhod like below:
view side: (get file list)
function saveDocuments(documentList) {
if (documentList.length > 0)
{
var formList = new Array;
for (var i = 0; i < documentList.length; i++) {
var form = new FormData();
var file = documentList[i];
form.append('FormFile', file);
formList.push(form);
}
savePhysicalFile(formList);
}
}
view side: (post file list)
function savePhysicalFile(formData)
{
if (formData != null)
{
$.ajax({
url: "Installation/SavePhysicalPath",
type: 'POST',
dataType: "json",
contentType: "multipart/form-data",
data:formData,
processData: false,
contentType: false,
success: function (result) {
console.log("Success", result);
},
error: function (data) {
console.log(data);
}
});
}
}
In my controller side; the parameter "model" is always null. I couldnt pass view side list here. How can I figure out ?
controller side
public JsonResult SavePhysicalPath([FromForm] List<FileModel> model)
{
var savingRootPath = #"C:\MyDocuments";
//I'm doing save locally
return Json(savingRootPath);
}
model side
public class FileModel
{
public string Files { get; set; }
public IFormFile FormFile { get; set; }
}

From your code,you may pay attention to two things here:
1.For each property of the complex type, model binding looks through the sources for the name pattern prefix.property_name. If nothing is found, it looks for just property_name without the prefix.For model you receive in backend is a List,you need give the name like:[index].FormFile or model[index].FormFile.
2.Your model has a IFormFile and your action receives a list model,if you only pass the IFormFile you need remove FromForm attribute and be sure do not have [ApiController].It is a known github issue and this has been moved to Next sprint planning milestone.
Here is a whole working demo:
View:
<input type="file" multiple onchange="saveDocuments(this.files)"/>
<div class="form-group">
<input type="button" value="Submit" id="submit" class="btn btn-primary" />
</div>
#section Scripts
{
<script>
function saveDocuments(documentList) {
if (documentList.length > 0) {
var form = new FormData();
for (var i = 0; i < documentList.length; i++) {
var file = documentList[i];
//change here
form.append('model['+i+'].FormFile', file);
}
savePhysicalFile(form);
}
}
function savePhysicalFile(formData) {
if (formData != null) {
$.ajax({
url: "/Installation/SavePhysicalPath",
type: 'POST',
dataType: "json",
contentType: "multipart/form-data",
data: formData,
processData: false,
contentType: false,
success: function (result) {
console.log("Success", result);
},
error: function (data) {
console.log(data);
}
});
}
}
</script>
}
Controller:
[HttpPost]
public JsonResult SavePhysicalPath(List<FileModel> model)
{
var savingRootPath = #"C:\MyDocuments";
//I'm doing save locally
return Json(savingRootPath);
}
Result:

How can I send a viewmodel to controller through Ajax

The user is able to write text and upload a file.
Using Javascript, I create an object with the file and text as properties, then send it to the controller using Ajax.
Using debugging, it seems that the problem is in the Ajax part. Everything before that(file upload, object creation) seems to be fine.
Here is the Javascript/JQuery:
function AddPost() {
var fileInput = document.getElementById('file').files;
var textInput = document.getElementById('addPostText').value;
if (fileInput != null || textInput != null) {
file = null;
if (fileInput.length > 0) {
file = fileInput[length-1];
}
var AddPostViewModel =
{
"Text": textInput,
"File": file
};
$.ajax(
{
url: "#Url.Action('AddPost')",
type: "POST",
dataType: "json",
data: JSON.stringify(AddPostViewModel),
contentType: 'application/json; charset=utf-8'
}
);
}
}
Here is the method in the controller:
[HttpPost]
public void AddPost(AddPostViewModel viewModel)
{
}
And here is the object:
public class AddPostViewModel
{
[DataType(DataType.MultilineText)]
public string Text { get; set; }
public IFormFile File { get; set; }
}
The HTML:
<textarea id="addPostText"></textarea>
<div class="upload-button">
<div class="label">Add image</div>
<input id="file" type="file" size="1" />
</div>

You can't send the File inside a json. Also, you've a bug in line file = fileInput[length-1]; (length is wrong, should be 0 or fileInput.length-1.
Here is a working function. This function should be inside a Razor Page because it needs to build the form action url #Url.Action("AddPost").
function AddPost() {
var fileInput = document.getElementById('file').files;
var textInput = document.getElementById('addPostText').value;
if (fileInput != null || textInput != null) {
var file = null;
if (fileInput.length > 0) {
file = fileInput[0];
}
var form = new FormData();
form.append("Text", textInput);
form.append("File", file);
$.ajax(
{
url: '#Url.Action("AddPost")',
type: "POST",
data: form,
processData: false,
contentType: false
}
);
}
}
EDIT Here is a full demo using the tag helpers asp-action, asp-for and a small JS/jQuery code to intercept the form submission and use Ajax.
1: Controller.
public class FileController : Controller
{
public IActionResult AddPost()
{
return View();
}
[HttpPost]
public void AddPost(AddPostViewModel viewModel)
{
//process the viewModel here
}
}
2: View
#model AddPostViewModel
<form asp-action="AddPost" id="theForm">
<textarea asp-for="Text"></textarea>
<input asp-for="File" size="1" />
<button type="submit">Send</button>
</form>
#section Scripts{
<script>
$("#theForm").submit(function(event) {
event.preventDefault();
$.ajax(
{
url: $(this).prop("action"),
type: "POST",
data: new FormData(this),
processData: false,
contentType: false,
success: function() {
console.log("form sent!");
}
}
);
});
</script>
}

You cant stringify a file data and you cant send file as JSON. You should use FormData to send file with ajax request.
Try to send request as follow
function AddPost() {
var fileInput = document.getElementById('file').files;
var textInput = document.getElementById('addPostText').value;
if (fileInput != null || textInput != null) {
file = null;
if (fileInput.length > 0) {
file = fileInput[length-1];
}
var AddPostViewModel =
{
"Text": textInput,
"File": file
};
var formData = new FormData();
Object.getOwnPropertyNames(AddPostViewModel).forEach(function ( attr, index ) {
var value = AddPostViewModel[attr];
formData.append(attr, value)
});
$.ajax(
{
url: "#Url.Action('AddPost')",
type: "POST",
contentType: false,
processData: false,
data: formData,
}
);
}
}

Pass javascript array to c# array/list using $.post without specifing datatype as json

I have a model created in javascript as follows
function Vehicle() {
this.type = 'Vehicle';
this.data = {
VehicleKey: null
}
};
I have a similar model created in c# as follows
public class Vehicle
{
public string VehicleKey { get; set; }
}
Now I am building an array of VehicleKeys in javascript as follows
function GetVehicleDetails(inputarray) {
var vehicleKeys = [];
for (var i = 0; i < inputarray.length; i++) {
var vehicleObject = new Vehicle();
vehicleObject.data.VehicleKey = inputarray[i].VehicleKey ? inputarray[i].VehicleKey : null;
vehicleKey.push(vehicleObject.data);
}
return vehicleKeys ;
}
I am calling the $.post(url, data) as follows
var objectToSend = GetVehicleDetails(selectedVehicles);
var data = JSON.stringify({
'vehicles': objectToSend
});
$.post(url, data)
.done(function (result) {
if (result) {
download(result, 'VehicleReport.xlsx', { type: 'application/octet-stream' });
console.log("Report created successfully");
}
else {
console.log("Error creating report");
}
}).fail(function (error) {
console.log("Error creating report.");
});
The MVC Controller has a method to accept Vehicles with multiple VehicleKeys coming from javascript
public byte[] CreateVehicleReport(List<Vehicle> vehicles)
{
//Generation of report and pass it back to javascript
}
Here I am able to submit the data in javascript as 10 and 11 for Vehicles but when it catches the c#, the count is coming as 0.
Any help would be greatly appreciated.

$.post is not posted Content-Type json data so you need to use $.ajax
function GetVehicleDetails(inputarray) {
var vehicleKeys = [];
for (var i = 0; i < inputarray.length; i++) {
var vehicleObject = {}; // Set Object
vehicleObject.VehicleKey = inputarray[i].VehicleKey ? inputarray[i].VehicleKey : null;
vehicleKeys.push(vehicleObject);
}
return vehicleKeys;
}
var objectToSend = GetVehicleDetails(selectedVehicles);
$.ajax({ type: 'POST',
url: url,
data: JSON.stringify(objectToSend),
contentType: "application/json",
dataType: 'json',
success: function (data) {
alert('data: ' + data);
},
}).done(function () {
if (result) {
console.log("Report created successfully");
}
else {
console.log("Error creating report");
}
}).fail(function () {
console.log("Error creating report.");
});
C# Method
[HttpPost("CreateVehicleReport")]
public byte[] CreateVehicleReport([FromBody]List<Vehicle> vehicles)
{
return null;
//Generation of report and pass it back to javascript
}

I used a similar approach once but with ajax and it went like this:
fill your array directly with the properties inside your class as object { } make sure the names are exactly the same:
function GetVehicleDetails(inputarray) {
var data_Temp = [];
for (var i = 0; i < inputarray.length; i++) {
var _vehiclekey = inputarray[i].VehicleKey ? inputarray[i].VehicleKey : null;
data_Temp.push({ VehicleKey : _vehiclekey });
});
return data_Temp;
}
var objectToSend = GetVehicleDetails(selectedVehicles);
var JsonData = JSON.stringify({ vehicles: objectToSend });
$.ajax({
type: "POST",
contentType: "application/json",
url: "/controllerName/actionName", //in asp.net using mvc ActionResult
datatype: 'json',
data: JsonData,
success: function (response) {
},
error: function (response) {
console.log(response);
}
});
And the ActionResult in the controller should look like this:
[HttpPost]
public ActionResult Create(List<Vehicle> vehicles)
{
//do whatever you want with the class data
}
I don't know if this is helpful for you but this always works for me and i hope it helps.

Upload file using MVC Razor from Ajax - Beginner logic issue

I am trying to upload a file using AJAX using C#-Razor. When I submit by clicking on the button the controller method is not being executed. How can I solve this ?
My code is as follows:
View
<div class="form-group">
#Html.TextBoxFor(model => model.IMG, new { #class = "control-label col-md-12", type = "file", placeholder = "Industry", name = "files[]", id="FileUpload" })
#Html.LabelFor(model => model.IMG, new { #class = "col-md-12 " })
#Html.ValidationMessageFor(model => model.IMG)
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="button" value="Create" class="btn btn-default" id="UseShipAddr" />
</div>
</div>
AJAX
$('#UseShipAddr').click(function () {
var formData = new FormData();
var totalFiles = document.getElementById("FileUpload").files.length;
for (var i = 0; i < totalFiles; i++) {
var file = document.getElementById("FileUpload").files[i];
formData.append("IMG", file);
alert("h" + file);
}
formData.append("name", "James");
formData.append("age", "1");
$.ajax({
url: "/Post/New",
type: "POST",
data: formData,
cache: false,
async: true,
success: function (data) {
alert(data);
}
});
});
Controller
[HttpPost]
//[ValidateAntiForgeryToken]
public async Task<ActionResult> New([Bind(Include="age","name","IMG")] POST rec)
{
if (ModelState.IsValid)
{
db.REC.Add(rec);
await db.SaveChangesAsync();
return RedirectToAction("My", "Post");
}
return View(rec);
}

Send the extra parameters in a querystring. Here is the AJAX code:
$.ajax({
url: "/Post/New?name=James&age=1",
type: "POST",
data: formData,
cache: false,
async: true,
contentType: false, // Not to set any content header
processData: false, // Not to process data
success: function (data) {
alert(data);
}
});
And your controller should be similar to below:
public async Task<ActionResult> New(string name, int age)
{
try
{
foreach (string file in Request.Files)
{
var fileContent = Request.Files[file];
if (fileContent != null && fileContent.ContentLength > 0)
{
// get a stream
var stream = fileContent.InputStream;
// and optionally write the file to disk
var fileName = Path.GetFileName(file);
using (var fileStream = new MemoryStream())
{
stream.CopyTo(fileStream);
}
// File is in the memory stream, do whatever you need to do
}
}
}
catch (Exception)
{
// whatever you want to do
}
}

You are not specifying any form while creating the form in object in your form submit #UseShipAddr click event. please specify your form while creating object as:
var formData = new FormData($(#formID)[0]);
or create form constructor
var dataString = new FormData();
append file to the form
dataString.append("UploadedFile", selectedFile);
var form = $('#formID')[0];
var dataString = new FormData(form);
now send that string to the action in controller.
There are lots of problem in your request. First remove this then you'll be able to call that action of the controller.

Ajax call hits with null values

I have a array and I get data from the array and going to pass it to the controller through ajax call.
But the problem is it hits the controller side with all the null values.(Data not passes,null passes )
Client Side Code
for (var j = 0; j < NewsGlobalArray.length; j++) {
var NewsRequestModel = {
DESCRIPTION: NewsGlobalArray[j]['DESCRIPTION'] // news description comes here.i checked it with console.log
}}
$.ajax({
url: $('#addNewsRequest').val(),
type: "POST",
data: { newsRequest: NewsRequestModel },
dataType: "json",
success: function (referenceNo) {
//success
}
});
}
My Controller
[HttpPost]
public JsonResult AddNewsRequest(NewsRequestModel newsRequest) // hits here with null values
{
//Some coding goes here.
}
My Model
public class NewsRequestModel
{
public int NEWSREQUESTID { get; set; }
public string DESCRIPTION { get; set; }
}

Try this: just add traditional:true in ajax call
$.ajax({
type: "POST",
url: $('#addNewsRequest').val(),
data: JSON.Stringify({ newsRequest: NewsRequestModel }),
dataType: "json",
traditional:true,
success: function (res) {
//do something
}
});

I think you need to this:
var myObject = new Object();
myObject.name = "John";
myObject.age = 12;
then pass myObject to ajax call and get on controller by name.