Disabled Items in Blazor DropDownList Component

16 Sep 20243 minutes to read

The DropDownList provides options for individual items to be either in an enabled or disabled state for specific scenarios. The category of each list item can be mapped through the Disabled field in the data table. Once an item is disabled, it cannot be selected as a value for the component. To configure the disabled item columns, use the DropDownListFieldSettings.Disabled property.

In the following sample, State are grouped according on its category using Disabled field.

CSHTML

@using Syncfusion.Blazor.DropDowns

<SfDropDownList TValue="string" TItem="StatusData" Placeholder="Select Status" DataSource="@LocalData">
    <DropDownListFieldSettings Value="Text" Disabled="State" ></DropDownListFieldSettings>
</SfDropDownList>

@code {

    public IEnumerable<StatusData> LocalData { get; set; } = new StatusData().StatusDataList();

    public class StatusData
    {
        public string Text { get; set; }
        public bool State { get; set; }

        public List<StatusData> StatusDataList()
        {
            List<StatusData> staus = new List<StatusData>();
            staus.Add(new StatusData { Text = "Open", State = false });
            staus.Add(new StatusData { Text = "Waiting for Customer", State = false });
            staus.Add(new StatusData { Text = "On Hold", State = true });
            staus.Add(new StatusData { Text = "Follow-up", State = false });
            staus.Add(new StatusData { Text = "Closed", State = true });
            staus.Add(new StatusData { Text = "Solved", State = false });
            staus.Add(new StatusData { Text = "Feature Request", State = false });
            return staus;

        }
    }
}

Disable Item Method

The disableItem method can be used to handle dynamic changing in disable state of a specific item. Only one item can be disabled in this method. To disable multiple items, this method can be iterated with the items list or array. The disabled field state will to be updated in the DataSource, when the item is disabled using this method. If the selected item is disabled dynamically, then the selection will be cleared.

Parameter	Type	Description
itemValue	string | number | boolean | object	It accepts the string, number, boolean and object type value of the item to be removed.
itemIndex	number	It accepts the index of the item to be removed.

Enabled

If you want to disabled the overall component to set the Enabled property to false.