Tabs Issue , Component is null

Support
1

Hi ,

I have issue on Tabs component. There are child components <tab> in <tabs>. I’m able to inject the <tab> into controller. Eg.

@ViewComponent
private Tabs carouselTabs;
@ViewComponent("carouselTabs.newRequestTab")
private Tab carouselTabsNewRequestTab;

<tabs id="carouselTabs" width="100%" themeNames="centered">
    <tab id="newRequestTab">
        <div>
            <p id="newRequestCount"/>
            <p text="msg://newRequest"/>
        </div>
    </tab>
</tabs>

But , It always complain that “this.carouselTabsNewRequestTab” is null when I open the screen.

Jmix version: 2.5.1
Jmix Studio Plugin Version: 2.5.1-243

Thank you for your help ~

2

Hi

Can it be a typo ?

     carouselTabsNewRequestTab
this.carouselTabsDraftRequestTab

NewRequest != DraftRequest

Regards

Felix

3

Hi ,
This is the correct code below:

<tabs id="carouselTabs" width="100%" themeNames="centered">
    <tab id="newRequestTab">
        <div>
            <p id="newRequestCount"/>
            <p text="msg://newRequest"/>
        </div>
    </tab>
</tabs>

@ViewComponent("carouselTabs.newRequestTab")
private Tab carouselTabsNewRequestTab;

carouselTabsNewRequestTab.setVisible(true);

Caused by: java.lang.NullPointerException: Cannot invoke “com.vaadin.flow.component.tabs.Tab.setVisible(boolean)” because “this.carouselTabsNewRequestTab” is null

It is not typo. Same error as above.

Thank you for ur help ~

4

Hi

A small testproject would help ;/

I don’t see in which context you use carouselTabsNewRequestTab.

Did you check with the https://demo.jmix.io/ui-samples/sample/tabs-orientation?tab=TabsOrientationSample.java ?

Regards

Felix

6

I can confirm that the tab of a Tabs component cannot be injected into view controller.
Created issue: Tab of Tabs component is not injected into view controller · Issue #4476 · jmix-framework/jmix · GitHub

As a workaround, you can find the tab programmatically, for example:

@ViewComponent
private Tabs carouselTabs;

@Subscribe
public void onReady(final ReadyEvent event) {
    carouselTabs.getTabAt(0).setEnabled(false);
}

Also, consider using the TabSheet layout: tabSheet :: Jmix Documentation.

Regards,
Konstantin