RadMultiSelect select value programmatically

[Igor]

Hello

I somehow can't find a way to programmatically set selected values of RadMultiSelect when page opening on the server.
Can you help me?
Thank you.

[Peter Milchev]

Hello Igor,

The type of the value is an object array, which contains multiple values. So, you can set the value as follows:

<telerik:RadMultiSelect ID="RadMultiSelect1" DataTextField="MyText" DataValueField="MyValue" runat="server" RenderMode="Lightweight">
</telerik:RadMultiSelect>

protected void Page_Init(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        RadMultiSelect1.DataSource = Enumerable.Range(1, 10).Select(x => new
        {
            MyText = "Item #" + x,
            MyValue = x
        });
        RadMultiSelect1.DataBind();


        // set value
        RadMultiSelect1.Value = new object[] { 3, 5 };
    }
}

As a token of gratitude for bringing to our attention that this information is missing in our docs, I have updated your Telerik points.

Regards,
Peter Milchev
Progress Telerik

[Igor]

So, you need to convert Datasource to the array. For example:

RadMultiSelect1.Value = dataTable.Rows.OfType<DataRow>().Select(k => k.Field<String>("USER_LOGIN")).ToArray();

Thank you.

PS. In regard to docs, your client event links are pointed from aspnet to kedno.

https://docs.telerik.com/devtools/aspnet-ajax/controls/multiselect/client-side-programming/events#examples

[Peter Milchev]

Hello Igor,

Thank you for sharing this, but in this case, it is intentional, because the RadMultiSelect is a server wrapper of the Kendo UI MultiSelect widget, hence the events are the same.

Regards,
Peter Milchev
Progress Telerik

[Alan]

How do you set initial value(s) if datasource is a datatable?

 

RadMultiSelect1.DataSource = dtStatus ;

RadMultiSelect1.Value = (value1, value2) ????

 

[Peter Milchev]

Hello Alan, 

The value property of the MultiSelect is an array of objects. It contains all the values that are selected in the MultiSelect. There is an example of that in the Virtualization demo as well as in my initial post in this thread:

• https://www.telerik.com/forums/radmultiselect-select-value-programmatically#ZVqfphMZ606y7k12zKsTGw 
• https://demos.telerik.com/aspnet-ajax/multiselect/virtualization/defaultcs.aspx

• protected void Page_Load(object sender, EventArgs e)
          {
              RadMultiSelect1.Value = new[] { "10265", "10289", "10390" };
          }

The important thing is that the Value property array contains only the values of your selected items, not the texts or other fields. 

Regards,
Peter Milchev
Progress Telerik