The following code sets up a button to add text boxes to a panel
dynamically:
public void setLayout() {
addPropertyButton = new Button("Add property");
addPropertyButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
addProperty("");
}
});
}
private void addProperty(String propertyName) {
final TextBox propertyTextBox = new TextBox();
propertyTextBox.setText(propertyName);
propertiesPanel.add(propertyTextBox);
// etc...
}
Let's say we wanted to retrieve the values of all text boxes in that
container, and put them in an array. Since we didn't keep track of all
text boxes, the obvious way to retrieve their contents would be to
typecast the container's widgets:
public ArrayList<String> getPropertiesList() {
ArrayList<String> array = new ArrayList<String>();
String s;
for (int i=0; i<propertiesPanel.getWidgetCount(); i++) {
TextBox tb = (TextBox) (propertiesPanel.getWidget(i));
s = tb.getText();
if (s.length()>0) {
array.add(s);
}
}
return array;
}
The above code yields a ClassCastException, which effectively makes
the getWidget() method useless for this purpose. One workaround is to
keep track of all the TextBox instances in a field collection, but it
seems redundant, since we already have a container holding all the
text box elements in it.
What's the pattern for dealing with this situation? Is this a GWT bug,
or does the javascript implementation require data holders to be
instance variables in order to retrieve their information?
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