Validation requirements Every field is required First Name and Last Name: at least 2 characters, and only contains uppercase and lowercase letters Phone Number: Format is ###-###-####, where #'s can only be digits Email Address: Format is xxx@xxx.yyy, where xxx and yyy stand in for any number of characters (at least one). yyy's can be any letter or digit. xxx's can be any letter, digit, or special characters:. _ or - Lucky Number: Can be any number between 1 and 100. Date of Birth: Format is mm/dd/yyyy or m/d/yyyy, where m, d, and y's can only be digits. The first two values for yy must be either 19 or 20. Question #B.2: For each of the six form fields, draft a regular expression that you think will work for each field-try to write them out by hand first! The six fields are: First Name, Last Name, Phone Number, Email Address, Lucky Number, Date of Birth Question #B.3: coding only One at a time, test each regular expression - it is very important to test one regex at a time, because it is much easier to troubleshoot! For each regex that you test, follow these steps: • Add one pattern attribute to an input tag and use your regular expression. Save your work and refresh the page. • Test your regex by trying to input both valid and invalid data. Part C: Creating the Java Validation Great work! You were able to create a functioning HTML form with validation! Now, you need to create this same form in Java. You have been given the JavaFX code for the layout; you will just need to write the code that does the validation. Question #C.1 - reading only As you saw in the previous research lab, JavaFX is a set of packages which creates event-driven applications. Applications are laid out differently than the types of programs we have been writing so far. Look at the main method - there is only one line, which calls the Application. launch method. This method then calls the start method, which is directly below main. Read through the beginning of this method (lines 28-65), to get a general sense of what is happening in this section of code. Unlike in HTML, Java does not have attributes to accomplish data validation. Instead, you need to create validation methods, utilizing the String methods. Question #C.2 Since there can be multiple errors on a form, you will need to accumulate your error messages. In other words, if the form has more than one error, it should show ALL of the error messages. In this program, what type of object is error? Look up this class in the JavaFX 8 documentation. What method can retrieve the current value stored in error? What method allows you to update the value in error?

import javafx.application.Application;
import javafx.geometry.*; 
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;  
import javafx.stage.Stage;
import javafx.event.*; 
import javafx.scene.text.*;


public class SweepstakesJavaFX extends Application 
{
  private TextField first = new TextField();
  private TextField last = new TextField();
  private TextField phone = new TextField();
  private TextField email = new TextField();
  private TextField luckyNum = new TextField();
  private TextField dob = new TextField();
  public Label error = new Label();
  public Label title = new Label("Sweepstakes Entry Form\nPlease complete the fields below");
  
  public static void main(String[] args)
    {
        Application.launch(args);
    }
   
  @Override
  public void start(Stage primaryStage) 
  {
    VBox labels = new VBox(); 
      GridPane pane = new GridPane();
    pane.setAlignment(Pos.CENTER);
      labels.setAlignment(Pos.CENTER);
      pane.setPadding(new Insets(10, 5, 5, 5)); 
      labels.setPadding(new Insets(5, 5, 5, 5)); 
      pane.setHgap(45.5);
      pane.setVgap(20.5); 
      
        title.setStyle("-fx-font-weight: bold; -fx-font-size:20;"); 
        error.setStyle("-fx-text-fill: red;"); labels.getChildren().add(title);
        labels.getChildren().add(error);  
      
        pane.add(new Label("First Name: "), 0, 0);
        pane.add(first, 1, 0); 
        pane.add(new Label("Last Name: "), 0, 1); 
        pane.add(last, 1, 1); 
        pane.add(new Label("Phone Number: "), 0, 2); 
        pane.add(phone, 1, 2);  
        pane.add(new Label("Email Address: "), 0, 3); 
        pane.add(email, 1, 3); 
        pane.add(new Label("Lucky Number: "), 0, 4); 
        pane.add(luckyNum, 1, 4); 
        pane.add(new Label("Date of Birth: "), 0, 5); 
        pane.add(dob, 1, 5); 
      
        Button btnSubmit = new Button("Submit"); 
        pane.add(btnSubmit,1,6); 
        GridPane.setHalignment(btnSubmit, HPos.RIGHT); 
            
        Scene scene = new Scene(new VBox(labels,pane), 450, 525);  
        primaryStage.setTitle("Sign up form"); // Set the stage title
        primaryStage.setScene(scene); // Place the scene in the stage
        primaryStage.show(); // Display the stage
      
        btnSubmit.setOnAction(new EventHandler()
        {
          @Override
          public void handle(ActionEvent e)
          {
              String fName = first.getText(); 
              String lName = last.getText(); 
              String inPhone = phone.getText(); 
              String inEmail = email.getText(); 
              String inLuckyNum = luckyNum.getText(); 
              String inDob = dob.getText(); 
            
              error.setText("");
              
              // Call the validation methods here.              
            
              if (error.getText() == "")
              { primaryStage.hide();
                  resultsPage();
              }
          }    
    }); 
  }
  
  public void checkFirst(String first)
   {
        if(first.isEmpty()){ error.setText("First name required"); } else if(!first.matches("}")){ error.setText("First name invalid");
  }
  
  public void checkLast(String last)
   {
        if(last.isEmpty()){ error.setText("Last name required"); } else if(!last.matches("}")){ error.setText("Last name invalid");
  }
  
  public void checkPhone(String phone)
  {
    if(phone.isEmpty()){ error.setText("Phone number required"); } else if(!phone.matches("")){ error.setText("Phone number format: ###-###-####");
  }
  
  public void checkEmail(String email)
   {
      if(email.isEmpty()){ error.setText("Email address required"); } else if(!email.matches("")){ error.setText("Email address invalid");
  }
  
  public void checkLuckyNum(String luckyNum)
   {
      if(luckyNum.isEmpty()){ error.setText("Lucky number required"); } else { try { int num = Integer.parseInt(luckyNum); if(num < 1 || num > 100){ error.setText("Lucky number must be between 1 and 100"); } } catch (NumberFormatException e){ error.setText("Lucky number invalid");
  }
  
  public void checkDob(String dob)
   {
        if(dob.isEmpty()){ error.setText("Date of Birth required"); } else if(!dob.matches("")){ error.setText("Date of Birth format: ##/##/#### or #/#/####");
  }
   
  
  public void resultsPage() 
   {
        Stage resultsStage = new Stage(); 
        VBox results = new VBox(); 
        results.setAlignment(Pos.CENTER);
        results.setPadding(new Insets(10, 5, 5, 5));
        Label congrats = new Label("Congrats!");
        Label display = new Label("The fields have been validated!");
        congrats.setStyle("-fx-font-weight: bold; -fx-font-size:20; -fx-text-fill:blue;");
        display.setStyle("-fx-font-weight: bold; -fx-font-size:20; -fx-text-fill:blue;");
        results.getChildren().add(congrats); 
        results.getChildren().add(display);
      
        Scene scene = new Scene(results, 400, 400);  
        resultsStage.setTitle("Results Page"); 
        resultsStage.setScene(scene);
        resultsStage.show(); 
   }
}