Bind to a Form and add Data to a vector

Vaadin 6 / 7 / 8 Framework Data Binding
1

The Idea of the Code:

i want to measure the powerconsumption for my house. i want to create an electric meter for every rent payer living int the house. for every electric meter i want to add every month a date and the value of the counter. at the end of the year i want to have an overview to see the power consumption.

Hi,
i have a problem to understand how to set a datasource or item for a combobox. My steps:

  1. I have a class, extended from “Form” with 2 Textfields to get the “name” and “number” of a Counter (e.g. Number 1234, Name = “rent payer mr. T”) . i can add these 2 values to the datasource with following code:
 (class extende from Form)
Counter c = new Counter();
setItemDataSource(new BeanItem(c));

In the Clickhandler for the Button “Save” i do:


if(source == save){
       ...!isValid();...  /short form written here
       ...commit();...
       Item addedItem = app.getCounterDataSource().addItem(c);
       setItemDataSource(addedItem);

Until here everything is ok. i can add this datasource to a table an see my entries:


Table t = new Table();
t.setContainerDataSource(app.getCounterDataSource());

With the next Step i have problems:

I want to have a combobox filled with the names of counters in the datasource. if a counter is selected by name i want to add “Countervalues” to the Vector of the “Counter” class.

My Sourcecode:


public class Counter implements Serializable{
	private String Name;
	private String Number;
	private Vector<CounterValues> Values = new Vector<CounterValues>();
	
	public Vector<CounterValues> getValues () {
		return Values ;
	}

	public void setValues (CounterValues Value) {
		this.Values.push_back(Values) ;
	}

	public Counter (){
	}

        setter() and getter()....


public class CounterValues implements Serializable{

	private Date CDate;
	private float CValues;
	
	public CounterValues(Date _Date ,float _CValue){
		this.CDate= _Date;
		this.CValues= _CValue;
	}

        setter() and getter()....


public class CounterValuesContainer extends BeanItemContainer<Zähler> implements  Serializable {

        createwithTestdata(){
         ....
       }
...
}
  1. how do i create a combobox with all available counters?
  2. how do i add the values of a form to the vector of a counter?

How it should work:

  • creating a Counter with Name and Number (works)
  • show Combobox with available counters
  • if one is selected show new Form to add to the selected Count a CounterValue (Date and value)