Comments by Ajit Kumar Pandit (Top 29 by date)

In my case, i am not facing any problem with Selecting, adding, or deleting, but getting problem during updating. Would you please take a look on below ajax calling to update View Model?
--------------------------------------------------
// Update Product Details
self.update = function () {
var Product = self.Product();
var id = Product.Id;
console.log(Product);
console.log(id);
if (Product.Name != "" & Product.Price != "" & Product.Category != "") {
$.ajax({
url: 'Product/UpdateProduct',
cache: false,
type: 'PUT',
contentType: 'application/json; charset=utf-8',
//data: ko.toJSON(id, Product),
data: { id: id, Product: Product },
success: function (data) {
self.Products.removeAll();
self.Products(data); // Put the response in observableArray
self.Product(null);
alert('Record has been updated successfully!');
}
}).fail(function (xhr, textStatus, err) {
alert(err);
});
}
else {
alert('Empty fields are not allowed!');
}
}

I am passing the same(two parameters) still getting the same issue. I have shown you all my codes on the above.

I have tried your solution, but it is also throwing me with the same error. I have been trying to resolved it from day after yesterday, but still feeling helpless. Thanks for all your responses.

I mean id is a local variable and Id is global variable

Yes, only Id and id are different.

var Product = {

Id: self.Id,
Name: self.Name,
Price: self.Price,
Category: self.Category
};

Error
-----------
PUT XHR http://localhost:58258/Product/UpdateProduct [HTTP/1.1 404 Not Found 2ms]
--------------------------
When I click on the above link, it shows following error
-------------------------------------------------
The parameters dictionary contains a null entry for parameter 'id' of non-nullable type 'System.Int32' for method 'System.Web.Mvc.JsonResult UpdateProduct(Int32, MvcWithKnockoutJS.Models.TblProductList)' in 'MvcWithKnockoutJS.Controllers.ProductController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.
Parameter name: parameters

Following line
------------------------------
// Update Product Details
self.update = function () {
var Product = self.Product();
var id = Product.Id;
console.log(id);
if (Product.Name != "" & Product.Price != "" & Product.Category != "") {
$.ajax({
url: 'Product/UpdateProduct',
cache: false,
type: 'PUT',
contentType: 'application/json; charset=utf-8',
data: ko.toJSON(Product),
success: function (data) {
self.Products.removeAll();
self.Products(data); // Put the response in observableArray
self.Product(null);
alert('Record has been updated successfully!');
}
}).fail(function (xhr, textStatus, err) {
alert(err);
});
}
else {
alert('Empty fields are not allowed!');
}
}

Alright sir, would you please let me know some examples/references using SignalR because I am very new in this case? Thank you.

Thanks

Alright sir. I have got the solution. Thanks.

Yes, I have seen that. Thanks.

Hahaha... Good joke. I like these types of communications.

Thank you. It seems like disable buttons that's why I have not noticed that. I'll do.

I am happy what explanation given by both of you.

I have got my points after reading all above explanations. Thank you Andy Lanng.

Thanks a lot sir.

Thank you Karthik.

Yes, but not getting it very clearly. Would you please help me and explain views in mvc? I am highly thankful for you.

Thank you Richard..

But there said that "While showing the card over the RFID reader", Card ID automatically display withing the TextBox.

Yes, you are very correct.
I am using following reference to read Card IDs
http://www.c-sharpcorner.com/blogs/rfid-programming1
but getting an error in following code block
private void RFID_DataReceived(object sender, SerialDataReceivedEventArgs e)
{

if (txttag.Text.Length >= 12)
{
RFID.Close();

}
else
{
DispString = RFID.ReadExisting();
// Getting error on below this.Invoke method
this.Invoke(new EventHandler(DisplayText));
}

}
Error - 'MainWindow' does not contains a definition for 'Invoke' and no extension method 'Invoke' accepting a first argument of type 'MainWindow' could be found(are you missing a using directive or an assembly reference?)

Manufacture is YUMDATTO

Any documentations/references/APIs are not given by the manufacturer. I really need some help in this situation.