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vaadin-miki / super-fields

Some extra Vaadin 14 / 24 components that support localisation, plus (hopefully) more.
Apache License 2.0
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Add an existing object to the collection of a CollectionField #447

Closed waterhd closed 1 year ago

waterhd commented 1 year ago

CollectionField allows adding a new row using .add() or .add(index), but this element is null by default. How to best add a new or existing object?

vaadin-miki commented 1 year ago

@waterhd first of all, thank you for using my components!

in general, collection field does not add elements to the collection - it only adds a new component using CollectionValueComponentProvider; so one way to add an existing object is to just have an implementation of that interface that does it (i.e. it creates a component and sets its value to whatever object you want)

the other option is to get the value of the collection field, then create a new collection with elements from that and the new element, then set the value of the collection field to that :) a bit convoluted, though (simply getValue().add(object) will not work, as the value of the field has not changed - it is still the same collection)

waterhd commented 1 year ago

Dear Miki

Thank you for your suggestions. I managed to get it working this way. Providing layout is still a bit challenging even when looking at the demo but I’m sure it’s just a bit of a learning curve.

Regards Dennis

On Mon, 19 Dec 2022 at 11:46, Miki @.***> wrote:

@waterhd https://github.com/waterhd first of all, thank you for using my components!

in general, collection field does not add elements to the collection - it only adds a new component using CollectionValueComponentProvider; so one way to add an existing object is to just have an implementation of that interface that does it (i.e. it creates a component and sets its value to whatever object you want)

the other option is to get the value of the collection field, then create a new collection with elements from that and the new element, then set the value of the collection field to that :) a bit convoluted, though (simply getValue().add(object) will not work, as the value of the field has not changed - it is still the same collection)

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M.vr.gr.

Dennis