Added event filter to okBtn. Brings up error message if no budget is selected

src/main/java/no/ntnu/idatt1002/demo/controller/SelectBudgetController.java

@@ -6,6 +6,8 @@ import javafx.collections.ObservableList;
 import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.scene.Node;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
 import javafx.scene.control.ListView;
 import javafx.scene.input.MouseButton;
 import javafx.stage.Stage;
@@ -16,6 +18,12 @@ import no.ntnu.idatt1002.demo.data.Budget.FileHandlingSelectedBudget;
 
 public class SelectBudgetController {
 
+  @FXML
+  Button okBtn;
+
+  @FXML
+  private Label errorMsg;
+
   @FXML
   private ListView<String> budgetListView;
 
@@ -25,6 +33,14 @@ public class SelectBudgetController {
 
   @FXML
   public void initialize() throws IOException {
+    okBtn.addEventFilter(
+        ActionEvent.ACTION, event -> {
+          if (budgetListView.getSelectionModel().getSelectedItem() == null) {
+            errorMsg.setOpacity(1);
+            event.consume();
+      }
+    });
+
     try {
       if (FileHandlingBudgetArchive.isBudgetRegisterEmpty()) {
         budgetRegister = new BudgetRegister();
@@ -59,7 +75,7 @@ public class SelectBudgetController {
 
   @FXML
   public void exitWindow(ActionEvent event) throws IOException {
-    FileHandlingSelectedBudget.updateSelectedBudget("");
+    FileHandlingSelectedBudget.clearSelectedBudget();
     final Node source = (Node) event.getSource();
     ((Stage) source.getScene().getWindow()).close();
   }

src/main/resources/view/SelectBudget.fxml

@@ -10,7 +10,7 @@
 
 <DialogPane prefHeight="300.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/19" xmlns:fx="http://javafx.com/fxml/1" fx:controller="no.ntnu.idatt1002.demo.controller.SelectBudgetController">
    <content>
-      <VBox alignment="CENTER" prefWidth="362.0">
+      <VBox alignment="CENTER" prefWidth="362.0" spacing="5.0">
          <children>
             <Label text="Select budget project">
                <font>
@@ -18,15 +18,20 @@
                </font>
             </Label>
             <ListView fx:id="budgetListView" prefHeight="200.0" prefWidth="200.0" />
+            <Label fx:id="errorMsg" opacity="0.0" text="Please select a budget" textFill="#e60707">
+               <font>
+                  <Font name="Lucida Console" size="14.0" />
+               </font>
+            </Label>
             <HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0" spacing="5.0">
                <children>
                   <Button mnemonicParsing="false" onAction="#exitWindow" prefWidth="70.0" text="Cancel" />
-                  <Button mnemonicParsing="false" onAction="#selectBudget" prefWidth="70.0" text="OK" />
+                  <Button fx:id="okBtn" mnemonicParsing="false" onAction="#selectBudget" prefWidth="70.0" text="OK" />
                </children>
             </HBox>
             <Label text="Click on an entry to select it">
                <font>
-                  <Font size="14.0" />
+                  <Font name="Lucida Console" size="14.0" />
                </font>
             </Label>
          </children>