Play framework select input validation - input

Question

I am using Play 2.1
I made a select drop down box using the helper field constructor.
The drop down box have 3 fields, default:"choose a gender", Male, and Female.
How do I ensure that the user choose one of male or female, and not the default value? (A required drop down field)

Answer 1

I am using Play!Framework 2.1.0, below is a simple solution for your problem:
The model should be like this: (Below is simple model for your problem)
package models;
import play.data.validation.Constraints;
public class Gender {
// This field must have a value (not null or not an empty string)
#Constraints.Required
public String gender;
}
The controller should be like this:
/** Render form with select input **/
public static Result selectInput() {
Form<Gender> genderForm = Form.form(Gender.class);
return ok(views.html.validselect.render(genderForm));
}
/** Handle form submit **/
public static Result validateSelectInput() {
Form<Gender> genderForm = Form.form(Gender.class).bindFromRequest();
if (genderForm.hasErrors()) { // check validity
return ok("Gender must be filled!"); // can be bad request or error, etc.
} else {
return ok("Input is valid"); // success validating input
}
}
The template/view should be like this:
#(genderForm: Form[models.Gender])
#import views.html.helper._
#main(title = "Validate Select") {
#form(action = routes.Application.validateSelectInput()) {
#********** The default value for select input should be "" as a value *********#
#select(
field = genderForm("gender"),
options = options("" -> "Select Gender", "M" -> "Male", "F" -> "Female")
)
<input type="submit" value="Post">
}
}
See also this post as reference : Use of option helper in Play Framework 2.0 templates