How to remove default value('0') in WicketTextField - wicket

Question

Here iam using a wicketText Textfield component to which an Integer type is mapped, Now on load of page iam getting the '0' as default value in that textfield. How to remove that 0 from the textfield.

Answer 1

Don't use int as the property type: that can't be null. Use Integer instead.

Answer 2

The TextField converts the value of the object in the model to a String. In case the object is null, the String will be empty.
You are probably using a int as Matrijn indicated. The java built-in primitive type can never be null but defaults to 0
So use a Integer. (Or you could create a custom Converter, but that is just messy)

Answer 3

what about using NumberTextField like this
NumberTextField numberField = (NumberTextField) new NumberTextField("numberField",
new Model(10));

Answer 4

I believe You may be using int instead of Integer. (int cannot be null, while Integer can)

Answer 5

Try to customize the Converter of your TextField
public class Converter<C> implements IConverter<C> {
#Override
public C convertToObject(String s, Locale locale) throws ConversionException {
return (C) s;
}
#Override
public String convertToString(C c, Locale locale) {
Class<? extends Object> aclass = c.getClass();
if (aclass == Long.class) {
return ((Long) c != 0) ? String.valueOf(c) : "";
} else if (aclass == Integer.class) {
return ((Integer) c != 0) ? String.valueOf(c) : "";
} else if (aclass == BigDecimal.class) {
return (!BigDecimal.ZERO.equals(c)) ? String.valueOf(c) : "";
}
return c.toString();
}
}
and then, override the default IConverter
new TextField<BigDecimal>("id") {
#Override
public <C> IConverter<C> getConverter(Class<C> type) {
return new Converter<C>();
}
}

Answer 6

The generic type of text field should be a reference. The Integer is good choice. But for a good programming choice it is better to use String.The new Model("") make your text field empty.
TextField<Integer> a = new TextField<Integer>("id",new Model(""));
you can get the integer value of your textfield by a.getValue() method.You can parse the such strings to int by Integer.parseInt(a.getValue()); property.
TextField<String> a = new TextField<String>("id",new Model(""));