Cannot set null value in FormItem

[getaceres]

I'm trying to set programatically a null value in a FormItem (really an IntegerItem), sice I want to clear its actual value, whatever it is. I have the following code:

item.setValue((Integer)null);

this:

Integer nulo = null;
item.setValue(nulo);

and this:

private Integer getNull() {
  return null;
}
item.setValue(getNull());

But it always gets translated to this:

 2616 com_smartgwt_client_widgets_form_fields_FormItem_$setValue__Lcom_smartgwt_client_widgets_form_fields_FormItem_2I(alertItem, null.nullMethod());

Which generates an exception, since null does not have methods. So, how can I clear the value of a FormItem element? Can I force it to have a null value in any way?

[hgaglani]

I dont know if this would work since I hvnt used IntegerItem.

But a possible work around would be to use item.setValue("") and on the server simply put a check if (value=="") then value=null;

Since it must be a part of a form, you could also do form.clearValues which simply clears all values.

I checked the API for IntegerItem which says that the default value it accepts is null so passing null doesnt seem to be the likely problem. I guess its the casting that is probably throwing the exception but again i m not sure.

Hope you could run some checks to confirm this.

Cheers,
Hetal

[smartgwt.dev]

The signature in SmartGWT is FormItem.setValue(int value). The reason item.setValue((Integer)null) compiles successfully is due to JDK 1.5 autoboxing but passing a null Integer to a method that accepts "int" will rause a null pointer exception. This is a pitfall of using autoboxing.

You could try setValue((String) null) to set a null value, but we'll look into changing the various setValue(..) method to accept the primitive wrapper class instead.

[getaceres]

Thanks, it worked casting it to String.

[Isomorphic]

See also DynamicForm.clearValue(fieldName). We'll add a helper on FormItem so this is easier to find.