Binder in Form, in case only to take all data in form to a bean, do i need it?

Flow
1

hi,

I need inputs or some thoughts regarding Binder.

Binder will bind a bean with values in a form.

Question is do i need a binder to a bean if:

  1. I only need to take form values to a bean.
  2. I need some default behaviours in form such as:
    2.1 Combo box group will be none is selected at the beginning of view.
    2.2 Date picker will be empty at the beginning of view.
  3. I need bean validation for user inputs if button pressed.

Thank you for all you hints.
sLawalata

2

Do you need binder to do all those things? No
Would binder make it easier? yes!

3

Hi @knoobie, thanks for your replay.

For taking all values from a form what i need to do:

  1. Create an empty bean.
  2. Bind this bean with a form.
    I find that i need to set all default values for this form. For example a birthday, i need to bind setter and getter and give a default value a localdate in the bean. If not binder will complain that it try to set a null value from bean to form.
    Meanwhile i don’t need to set all default values in form because all this value must be empty as default in a form if i dont use binder.

Question is all default value should be set if we want to use binder?
Or even it is a best practice to set all default value in a form?

Thank you,
sLawalata

4

What do you mean with default values? null is a default value, so there is nothing to be set. If you want to use e.g. 1980-01-01 as default value because it was e.g. preselected in the bean; add this field / attribute to your bean and let the binder read it.