This is a strange bug I came across when making a simple grid for a small personal project. I created a class called Book, which looks like this:
[Table("Books")]
public class Book
{
[Key]
public int Id { get; set; }
[Required]
public string Title { get; set; } = null!;
public Checkout? Checkout { get; set; }
[NotMapped]
public bool CheckedOut => Checkout != null;
}I then created a simple Razor view on which to show the books on a grid. Here is what the code for the page looks like:
@{
ViewData["Title"] = "All Books";
}
@(
Html.Kendo().Grid<LibraryMvc.Core.Entities.Book>()
.Name("bookGrid")
.Pageable(p => {
p.PageSizes(new[] {20, 50, 100 });
p.Numeric(true);
p.Input(true);
})
.Editable(e => e.Mode(GridEditMode.InLine))
.Filterable()
.Sortable()
.Scrollable()
.ToolBar(t => t.Create())
.Columns(col => {
col.Bound(c => c.Id).Title("ID");
col.Bound(c => c.Title).Title("Title");
col.Bound(c => c.CheckedOut).Title("Checked Out");
col.Command(com => {
com.Edit();
com.Destroy();
}).Title("Manage");
})
.DataSource(ds =>
ds.Ajax()
.PageSize(20)
.Model(md => {
md.Id(f => f.Id);
md.Field(f => f.Id).Editable(false);
md.Field(f => f.CheckedOut).Editable(false);
})
.Read(r => r.Action("Book_Read", "Book"))
.Create(c => c.Action("Book_Create", "Book"))
.Update(c => c.Action("Book_Update", "Book"))
.Destroy(c => c.Action("Book_Destroy", "Book"))
)
)
When running my app with this code, I noticed that client-side validation would not work on the grid. Nothing would stop me from adding multiple Book rows with empty Titles, despite Title being a [Required] property based on my Book class's Data Annotations:
I assumed I did something wrong, so I scoured the internet and Telerik's support items in hopes of finding something, but then I came across this when inspecting the page's elements in Chrome's dev tools:
Look at the script tag. For whatever reason, the kendoTextBox ended up using the Razor view's ViewData["Title"] property. Oops!
To work around this, I ended up changing my Book class's Title field to BookTitle, as shown below:
[Table("Books")]
public class Book
{
[Key]
public int Id { get; set; }
[Required]
[Column("Title")]
public string BookTitle { get; set; } = null!;
public Checkout? Checkout { get; set; }
[NotMapped]
public bool CheckedOut => Checkout != null;
}With this property name changed, I was able to get client-side validation to work as needed:
A second workaround involved getting rid of the ViewData["Title"] definition on my Razor view:
Given all this, it looks like something that's generating the client-side validation on the page is getting tripped up over the word "Title" being used by multiple items on the page.