saad749 / begincollectionitemcore Goto Github PK

I'm using BeginCollectionItem and I need to require a field in my collection depending on the value of another field in my collection. I tried using the built-in IValidatableObject on my class like so:

public class MyViewModel : IValidatableObject
{
	public List<MyCollection> MyCollection { get; set; } = new List<MyCollection>();

	public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
	{
		foreach (var item in MyCollection)
		{
			if (item.Id == null)
			{
				yield return new ValidationResult("Name is required", new[] { "Name" });
			}
		}
	}
}

This logic runs correctly and returns an error if the condition is met, however, the error message is not displayed on the field. Is there a way to make this work or am I going about this the wrong way?

Hi,
please is there any documentation related to the "nested collections" feature?
Nested items from the initial ViewModel are correctly displayed and posted back, but newly added children are not.
Looking at the generated HTML it appears that the newly added inner children are not decorated with any reference to their parent.
Please, how shoud I solve this issue?
Thanks

Hi,

I'm using Visual Studio 2017 and .Net Core 1.1.

When I utilise the library for a nested collection, I'm getting Null Reference Exception error on post.

This is my class hierarchy:

Application => List<_Section>
_Section => List<_Question>
_Question => List<_Question>

Is this an issue?

Has anyone tried using this with server side validation? I put a [Required] attribute on one of my properties in my model class and when I go to submit (with client side validation disabled) I can see that the ModelState is not valid. However, the required message does not get added to the view.

If I keep client side validation enabled, the required message does show.

Hi, can you also provide an ASP MVC 5 version, theres is one out there but it makes a round trip on every row add.

Thanks

update to .netstandard2.0

I have used BeginCollectionItem with kendo controls but not giving proper name to the kendo elements. working fine with other elements. whereas asp.net mvc version for begincollectionitem is working fine but core version is not working.

I have used .Net 5.0 framework.

For more detail I have posted the issue in stackoverflow site.
https://stackoverflow.com/questions/70498065/asp-net-core-begin-collection-item-core-not-working-with-kendo-controls

Found the solution issue with kendo control render and solved and posted solution on above stackoverflow site.