Method not fired when no records selected in TreePanel

[QuAzI]

On the form places TreePanel and ComboBox. When I change combobox some data must be taken from TreePanel or alert must be showed if no records selected. But if no records selected in TreePanel SelectedItemActivationComboBoxSelect not fired by select event. How I can do it?

<ext:ComboBox ID="SelectedItemActivationComboBox" ValueField="categoryId" DisplayField="category" Editable="false" Disabled="true" Margins="15 0 15 0" Flex="1" runat="server">
	<Store>
		<ext:Store runat="server" ID="SelectedItemActivationComboBoxStore">
			<Model>
				<ext:Model runat="server" ID="SelectedItemActivationComboBoxStoreModel">
					<Fields>
						<ext:ModelField Name="categoryId" />
						<ext:ModelField Name="category" />
					</Fields>
				</ext:Model>
			</Model>
		</ext:Store>
	</Store>
	<DirectEvents>
		<Select OnEvent="SelectedItemActivationComboBoxSelect">
			<ExtraParams>
				<ext:Parameter Name="nodeId" Value="#{SourceDbTreePanel}.getSelectionModel().getSelection()[0].data.id" Mode="Raw" />
				<ext:Parameter Name="categoryId" Value="#{SelectedItemActivationComboBox}.getValue()" Mode="Raw" />
			</ExtraParams>
		</Select>
	</DirectEvents>
</ext:ComboBox>

[Daniil]

Hi @QuAzI,

I think there is a JavaScript error here.

Value="#{SourceDbTreePanel}.getSelectionModel().getSelection()[0].data.id"

If there is no record selected, then a getSelection call returns an empty array and indexing [0] causes a "not defined error".

So, do you need to fire a DirectEvent if no selection? If no, then

<Select OnEvent="SelectedItemActivationComboBoxSelect" Before=" return #{SourceDbTreePanel}.getSelectionModel().hasSelection();">

Returning false from a DirectEvent's Before prevents that DirectEvent.

If you need to pass "-1", for example, then:

<ext:Parameter 
    Name="nodeId" 
    Value="#{SourceDbTreePanel}.getSelectionModel().hasSelection() ? #{SourceDbTreePanel}.getSelectionModel().getSelection()[0].data.id : -1" 
    Mode="Raw" />

[QuAzI]

Thats great! Thanks