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Filtering foreign key column values in Grid

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Grid

This is a migrated thread and some comments may be shown as answers.

Phil asked on 21 May 2018, 09:34 PM

Hi all,

I hope I can explain this. I will try to put together a small sample, but I wanted to get this out there as soon as I could.

I'm using ASP.Net Core 2.0.

I have a grid that has a foreign key to an enum value on my model. I have an EditorTemplate set up, which builds a SelectList from the enum values and binds it to a Kendo DropDownList, and it works great:

@model MyEnumType

@{

var enumTypeSelect = Enum.GetValues(typeof(MyEnumType))

.Cast<MyEnumType>()

.Select(value => new SelectListItem()

{

Text = value.ToString(),

Value = ((int)value).ToString()

});

}

@(Html.Kendo().DropDownListFor(model => model)

.DataTextField("Text")

.DataValueField("Value")

.BindTo(enumTypeSelect))

And in my grid:

@(Html.Kendo().Grid<MyViewModel>(Model.Items)

.Name("grid")

.Columns(columns =>

{

columns.Bound(li => li.ID).Visible(false);

columns.Bound(li => li.EnumType).Width(170)

.ClientTemplate("#: Description #")

.EditorTemplateName("_GetValidEnumItemTypesPartial");

... rest of grid...

Now, though, I have a requirement where once I select certain enum types, I have to exclude OTHER enum types from subsequent entries in my model. This is similar to, but not exactly, like a set of cascading drop downs, where the contents of the second depend upon the first.

So, I need to filter those enum types from the list. I've tried a couple things:

- setting the drop down's dataSource filter, like this:

$("#LineItemType").data().kendoDropDownList.dataSource.filter({ field: 'Value', operator: 'neq', value: 1 })

$("#LineItemType").data().kendoDropDownList.dataSource.filter({ field: 'Text', operator: 'neq', value: 'MyValue' })

I've tried this at various places: when I've added the item to the grid, and when I'm about to add the item. This doesn't seem to work at all.

- Loading the list of valid values via Ajax - the problem there is that I don't know whether I'm updating the FIRST value (so I can set it to anything) or a NEW value (where I would restrict), so I can't reliably determine what the values should be.

Nothing seems to work so far.

There's an option that changes my data model - but I would rather not do this if I can avoid it.

Any help is appreciated - thanks!

Phil

Filtering foreign key column values in Grid

2 Answers, 1 is accepted