in UiBinder
@UiField ListBox testListBox;
in presenter, I have a method getData() that put data into the testListBox.
public void getData(){
getView().getTestListBox().clear();
getView().getTestListBox().addItem("itm 1");
getView().getTestListBox().addItem("itm 2");
getView().getTestListBox().addItem("itm 3");
getView().getTestListBox().addChangeHandler(new ChangeHandler(){
@Override
public void onChange(ChangeEvent event) {
// TODO Auto-generated method stub
int ind=getView().getTestListBox().getSelectedIndex();
System.out.println(getView().getTestListBox().getValue(ind));
}
});
}
Now, i also have a button to call getData(). If i click that button 1 time,
then I select "itm 1" in thetestListBox everything is fine as it will print
out:
itm 1
However, if I click that button 2nd times, & select "itm 1" then it prints
out twice "itm 1":
itm 1
itm 1
If i click it 3rd time, it will print out triple "itm 1"....
But if i put the getView().getTestListBox().addChangeHandler outside
getData() method before i add the item into the listbox (ie I do the
addChangeHandler before there is actual item inside the listbox), then
everything is fine as it print out only 1 time.
So What is the best practice for coding addChangeHandler in Gwt?
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