Vaadin 7 Combo Box - how to fill in the drop-down list when entering text?

Question

I have an application in which there are editors for various database entries. These entries refer to each other. I am developing a new custom component that supports data, which is based on ComboBox:

public abstract class CustomDbLookupField<T> extends CustomField<T> implements Field<T> 

Here is what I want:

• the component looks like a combo box (I could do it easily)
• when the corresponding field has a row identifier value, then the component displays a textual representation of this reference record (I could do that too)
• when the user starts typing in combobox, I want to search for keywords in the database and fill in the drop-down lists with these elements, and then
• clear the combo box for it and select it from the results

I can not imagine the last two parts. I wanted to associate the listener with the event "text typed in the combo box", but I can not find any method for this. Moreover, I do not know how to get the text that has just been entered. I tried to do this:

cmb.addListener(com.vaadin.event.FieldEvents.TextChangeEvent.class,target, method);

but I don’t know what to pass to the target and method parameters.

Answer 1

This is a good question and one that cannot be answered in a few sentences. I will try to give you a short answer in advance and try to tell you more about this later. I am currently hacking a small example demonstrating the function you want to achieve. But I need some more time. I will update my answer as soon as I get some results.

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