How to vaildate fields

General
1

Hi,
I have using vaadin technology i need validate combobox, radio button and textbox still now am using form validation in my application so please ow can i solve this issue if any idea let me know.

form.addField(“select”, select);
form.setComponentError(new UserError(e.getMessage()));

but i did not get the error msg in my ui …

Please any idea let me know

thanks
karthik

2

try field.setImmediate(true) and also set the compoentError onto the field, not onto the form.
Maybe that helps.

3

Hi Karthik and Marcel,

If you want to validate the fields you need to add a validator to them in order to make validation works as expected, you can read more in depth about it in the book of vaadin
5.19 Form
, point 5.19.3 Validating Form Input.

For example, extracted from book:

// Postal code that must be 5 digits (10000-99999).
TextField field = new TextField("Postal Code");
field.setColumns(5);

// Create the validator
Validator postalCodeValidator = new RegexpValidator(
    "[1-9]
[0-9]
{4}", "Postal code must be a number 10000-99999.");
field.addValidator(postalCodeValidator);

// Set the form to act immediately on user input. This is
// necessary for the validation of the fields to occur immediately
// when the input focus changes and not just on commit.
form.setImmediate(true);

// The Commit button calls form.commit().
Button commit = new Button("Commit", form, "commit");

HTH.

Javi.

4

Thank you…