How do you pre-select an item in a DropDownList? When a user has selected an item in a DropDownList we save that so that next time the list is displayed the previously selected item is shown. However, we can't find a way to do that.
Our DropDownList component is defined as:
<SfDropDownList DataSource="@businessGroups" TItem="BusinessGroup" TValue="int?" Placeholder="Select a Business Group" @bind-Value="@selectedGroupId">
<DropDownListFieldSettings Text="Name" Value="Id"></DropDownListFieldSettings>
</SfDropDownList>
The DataSource is defined as (the code to populate the businessGroups List is not shown):
private List<BusinessGroup> businessGroups = new List<BusinessGroup>();
internal class BusinessGroup
{
public BusinessGroup(int id, string name)
{
this.Id = id;
this.Name = name;
}
public int Id { get; private set; }
public string Name { get; private set; }
}
We expect to be able to set the initial Item displayed by the DropDownList with a statement like:
public int? selectedGroupId = 9;
where the 9, in this example, is a BusinessGroup.Id value in the businessGroups List. However, no matter what we try, the DropDownList stubbornly only displays the "Select a Business Group" Placeholder and not the
businessGroup List
entry with
BusinessGroup.Id
= 9.
Your advice would be appreciated.
Peter,
