How to construct a vaadin view that needs a parameter

Question

I have a Vaadin view that needs a parameter for its construction (e.g. number of weeks to show). However, commonly construction of a view is done in the constructor, while parameters are set in the setParameter method, which is called after the constructor.

Is there a way to build the view after the setParameter is called?

Leif Åstrand · Accepted Answer · 2022-08-03 12:56:39Z

2

You can simply skip implementing the constructor and instead set up the whole view in setParameter or beforeEnter.

Depending on the case, you might have to be careful to avoid problems if the user can navigate directly to the same view but with another parameter value since in that case setParameter (or beforeEnter) would be called again for the same instance which means that you might end up setting up everything again and thus end up with duplicates in the view.

edited Aug 3, 2022 at 12:56

answered Aug 3, 2022 at 6:00

Leif Åstrand

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2 Comments

tbeernot Over a year ago

There may be more parameters. I could kludge it by counting those, but if any are optional I have a problem. I could use query parameters, then all are present at once. Seems like the beforeEnter event method is called after setParameter, and may be just as suited?

Leif Åstrand Over a year ago

Yes. beforeEnter is also a valid choice. I'll update my response to also mention that possibility.

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