[Razor] How to use OnEvent on in "Select"

In this Example: https://examples2.ext.net/#/GridPane.../Form_Details/
It use

Code:

---

<Select OnEvent="RowSelect" Buffer="250">
                                    <EventMask ShowMask="true" Target="CustomTarget" CustomTarget="#{FormPanel1}" />
                                    <ExtraParams>
                                        <%--or can use params[2].id as value--%>
                                        <ext:Parameter Name="EmployeeID" Value="record.getId()" Mode="Raw" />
                                    </ExtraParams>
                                </Select>

---

I try convert to Razor:

Code:

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.SelectionModel(gaSelectionModel => {
gaSelectionModel.Add(Html.X().RowSelectionModel().DirectEvents(garowdirecteve => {
garowdirecteve.Select.ExtraParams.Add(Html.X().Parameter().Name("ga_id").Value("record.getId()").Mode(ParameterMode.Raw));
          }));
})

---

But I cannot use OnEvent.

Event can be used under WebForm only
In MVC application, you have to use Url points to controller action

My boss request me use Javascript, Can I use it to call Javascript

Code:

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.SelectionModel(gaSelectModel => {
              gaSelectModel.Add(Html.X().RowSelectionModel().Listeners(garowSelectListen => {
              garowSelectListen.Select.Handler = "gaSelectBind();";
        }));
})

---